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WO2014013623A1 - Procédé permettant de produire une tôle d'acier qui présente d'excellentes propriétés de conversion chimique et une excellente résistance au grippage - Google Patents

Procédé permettant de produire une tôle d'acier qui présente d'excellentes propriétés de conversion chimique et une excellente résistance au grippage Download PDF

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Publication number
WO2014013623A1
WO2014013623A1 PCT/JP2012/068744 JP2012068744W WO2014013623A1 WO 2014013623 A1 WO2014013623 A1 WO 2014013623A1 JP 2012068744 W JP2012068744 W JP 2012068744W WO 2014013623 A1 WO2014013623 A1 WO 2014013623A1
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WIPO (PCT)
Prior art keywords
zinc
chemical conversion
steel sheet
aqueous solution
galling resistance
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Ceased
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PCT/JP2012/068744
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English (en)
Japanese (ja)
Inventor
大塚　真司
平　章一郎
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JFE Steel Corp
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JFE Steel Corp
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Publication date
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Priority to CN201280074788.XA priority Critical patent/CN104471115A/zh
Priority to KR1020147036256A priority patent/KR20150014517A/ko
Priority to PCT/JP2012/068744 priority patent/WO2014013623A1/fr
Publication of WO2014013623A1 publication Critical patent/WO2014013623A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D9/00—Electrolytic coating other than with metals
    • C25D9/04—Electrolytic coating other than with metals with inorganic materials
    • C25D9/08—Electrolytic coating other than with metals with inorganic materials by cathodic processes
    • C25D9/10—Electrolytic coating other than with metals with inorganic materials by cathodic processes on iron or steel
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C22/78—Pretreatment of the material to be coated

Definitions

  • the present invention relates to a method for producing a steel sheet excellent in chemical conversion treatment and mold galling resistance, which is suitably used as, for example, an automobile material.
  • Cold rolled steel sheets are widely used in fields such as automobiles, home appliances, and building materials. Particularly in the automotive field, cold-rolled steel sheets are used because of demands regarding sheet thickness accuracy and flatness. In recent years, the use of high-strength cold-rolled steel sheets as automobile steel sheets has increased rapidly from the viewpoint of reducing CO 2 emissions and ensuring safety in automobiles.
  • a high-strength steel plate is a steel plate to which Si, Mn, or the like is added as an element in the steel, and these elements form an oxide typified by, for example, SiO 2 or MnSiO 4 on the surface of the steel plate in the annealing process.
  • Si, Mn, or the like is added as an element in the steel, and these elements form an oxide typified by, for example, SiO 2 or MnSiO 4 on the surface of the steel plate in the annealing process.
  • the chemical conversion treatment property when a steel sheet having SiO 2 formed on the surface in this way is subjected to a chemical conversion treatment before coating, there is a so-called skein portion where no chemical conversion crystal is formed. If a site called a scale in which a chemical conversion treatment crystal is not formed is generated, when applied as a steel sheet for automobiles, it is not preferable because it may cause a decrease in coating adhesion and a decrease in corrosion resistance.
  • mold galling resistance when press-molding a high-strength steel sheet, not only the molding load increases, but also a problem called mold galling occurs due to the occurrence of a local high surface pressure portion. Die squeezing causes local adhesion due to contact and sliding between the steel plate and the metal that constitutes the press die at high surface pressure, and scratches may occur due to the accumulation of adhesions. This is thought to occur due to an increase in sliding resistance.
  • Patent Document 1 discloses that one or more metals of Ni, Mn, Co, Mo, and Cu are cooled. A technique for discontinuously depositing on the surface of a rolled steel sheet is disclosed.
  • Patent Document 2 discloses that a cold rolled steel sheet has a zero-valent zinc-based ultrathin coating on the lower layer, and an upper layer is a second element composed of one or more of divalent zinc, P, B, and Si.
  • a technique for forming a multi-layered amorphous film composed of a group of oxides is disclosed.
  • temper rolling is performed after powders of one or more metal oxides of Zn, Ni, Mn, Ti, Co, Mo, and Al are dispersed on the surface of a cold-rolled steel sheet.
  • a technique for forming a metal layer of 1000 mg / m 2 or less on a steel sheet surface in terms of metal is disclosed.
  • Patent Document 1 Even if the method described in Patent Document 1 is applied to a cold-rolled steel sheet containing Si, the Si oxide remains as it is on the surface of the steel sheet, so that the chemical conversion property is still poor.
  • elements such as Mo and Cu have an adverse effect on the chemical conversion treatment property, and there is a problem that the chemical conversion treatment property deteriorates due to elution from the steel sheet to the chemical conversion treatment solution during chemical conversion treatment.
  • Patent Document 2 since a forming load and a local surface pressure increase when pressing a high-strength steel sheet, a second element composed of one or more of divalent zinc and P, B, Si applied to the upper layer is used. When the oxide layer of the group is destroyed, the press formability is hindered by the adhesion between the lower-valent zinc and the die, and the mold galling resistance deteriorates. Moreover, in patent document 2, the steel plate surface distribution rate of the said film
  • Patent Document 3 it is considered that the powder and the steel sheet are in close contact with each other due to physical adhesion by temper rolling. In other words, the adhesion between the powder and the steel sheet is very low.
  • the powder is severely detached from the steel sheet, and the pressed powder accumulates. Scratches are likely to occur.
  • Patent Document 3 describes that a uniform chemical conversion film is formed by uniformly dispersing metal oxide on the surface of a steel sheet.
  • dot is not described, it is unclear, but it is generally considered that the coverage is 50% or less, and when the coverage is low, it is difficult to mold parts such as double beads. It is conceivable that the uncoated base steel sheet and the mold come into contact with each other to cause adhesion and cause mold galling.
  • Patent Document 4 zinc oxide and / or zinc hydroxide is formed on a steel sheet surface by electrolytic treatment using a steel sheet as a cathode in an aqueous solution containing zinc ions, and the coating amount is 70 in terms of metallic zinc. It has been found that it is effective to improve the chemical conversion treatment property and the mold galling resistance to have a coverage of 60% or more at ⁇ 500 mg / m 2 .
  • the present invention has been made in order to advantageously solve the above problems, and an object of the present invention is to provide a method for producing a steel sheet excellent in chemical conversion treatment property and mold galling resistance.
  • the inventors of the present invention have made extensive studies to solve the above problems.
  • zinc oxide and / or zinc hydroxide is formed on the surface of the steel sheet by electrolytic treatment using the steel sheet as a cathode in an aqueous solution containing zinc ions and nitrate ions.
  • Conversion to 70 to 500 mg / m 2 , a coverage of 60% or more, and a process of bringing the steel sheet into contact with the phosphorous-containing aqueous solution after the electrolytic treatment can be performed even when the chemical conversion treatment liquid is cooled.
  • the inventors of the present invention have found that it is effective for improving processability and anti-scoring property.
  • the present invention has been made based on the above findings, and the gist thereof is as follows.
  • Electrolytic treatment with a steel plate as a cathode in an aqueous solution containing zinc ions and nitrate ions, and zinc oxide and / or zinc hydroxide on the surface of the steel plate is converted to a metal zinc content of 70 to 500 mg / m 2 and steel sheet surface coverage: formed to be 60% or more, and then contacting the steel sheet with an aqueous solution containing phosphorus, to produce a steel sheet excellent in chemical conversion property and mold galling resistance Method.
  • the steel sheet contains 0.1% by mass or more of Si, and the method for producing a steel sheet excellent in chemical conversion treatment property and mold galling resistance.
  • [3] A method for producing a steel sheet excellent in chemical conversion treatment property and mold galling resistance, characterized in that the phosphorus content of the aqueous solution containing phosphorus is 5 to 5000 mass ppm in the above [1] or [2] .
  • the aqueous solution containing phosphorus has a pH of 4 to 12, and a method for producing a steel sheet having excellent chemical conversion property and mold galling resistance .
  • a steel sheet excellent in chemical conversion treatment and mold galling resistance can be obtained.
  • the present invention has an effect on cold-rolled steel sheets, particularly high-strength cold-rolled steel sheets containing Si, and is an effective technique that achieves both chemical conversion processability and die-squeeze resistance of high-strength cold-rolled steel sheets. Industrially extremely valuable.
  • FIG. 1 is a schematic front view (Example) showing a dynamic friction coefficient measuring apparatus.
  • FIG. 2 is a schematic perspective view showing the bead shape and dimensions in FIG.
  • the steel plates targeted in the present invention are hot-rolled steel plates and cold-rolled steel plates.
  • the present invention is optimal for cold-rolled steel sheets that are frequently used in the automotive field and the like.
  • Steel plates with various elements added to steel to improve various properties such as mechanical properties (for example, high-strength steel plates) have non-uniform phosphate crystals during chemical conversion treatment due to the influence of additive elements present on the surface. May be.
  • a uniform chemical conversion coating is always required for steel sheets. From such a viewpoint, it is valuable to apply the present invention to a steel sheet to which the above various elements are added, and a stable chemical conversion coating can be obtained by the present invention.
  • the components of the steel sheet targeted by the present invention are not particularly limited.
  • a steel sheet having a Si content of 0.1% by mass or more is preferably used. This is because when the Si content in the steel is 0.1% by mass or more, Si oxide is usually formed on the surface of the steel sheet, which greatly impairs the chemical conversion processability. Therefore, the value of applying the treatment of the present invention is great. Because. Even when pressing, steel sheets with a Si content of 0.1% by mass or more tend to cause mold galling due to the increased strength of the steel sheet. By applying the treatment of the present invention, mold galling is greatly suppressed. Is done.
  • the chemical conversion processability is significantly deteriorated by the conventional method.
  • the present invention is applied to a steel sheet containing Si by 0.3 mass% or more and having Si content / Mn content ⁇ 0.4.
  • electrolytic treatment is performed using a steel plate as a cathode in an aqueous solution containing zinc ions and nitrate ions to form zinc oxide and / or zinc hydroxide (hereinafter sometimes referred to as zinc-based oxide) on the surface of the steel plate. It is characterized by making it.
  • the zinc-based oxide formed by the cathodic electrolysis method has a very fine network shape with one side of 1 ⁇ m or less. By forming these zinc-based oxides on the surface of the steel plate, this network The shape of the film contributes to improvement of mold galling resistance.
  • zinc oxide is a refractory metal and suppresses adhesion between the mold and the steel sheet, so that it is difficult for mold galling to occur, and at the same time, oil such as press oil applied during pressing can be secured. This is thought to be because it is possible to remarkably suppress the adhesion due to oil shortage due to movement. Furthermore, cathodic electrolysis is also effective from the viewpoint of controlling the amount of zinc-based oxide formed.
  • electrolytic treatment is performed using a steel plate as a cathode in an aqueous solution containing zinc ions and nitrate ions to form a zinc-based oxide on the surface of the steel plate.
  • a steel plate as a cathode in an aqueous solution containing only zinc ions zinc metal is deposited on the surface of the steel plate. Therefore, in the present invention, it is possible to form a zinc-based oxide on the surface of the steel sheet by further adding nitrate ions to the aqueous solution containing zinc ions.
  • the amount of zinc ion in the aqueous solution is 0.1-1 mol / L
  • the nitrate ion is 0.1-1 mol / L as nitric acid
  • the current density is 1-30 A / dm 2
  • the liquid temperature is 30-70 ° C.
  • the relative flow rate is in the optimum range of 0.5 to 2.0 m / s.
  • the compound to which zinc ions or nitrate ions are added is not particularly limited, and examples of the zinc ion supply compound include zinc sulfate, zinc chloride, and zinc nitrate, and examples of the nitrate ion supply compound include sodium nitrate and potassium nitrate.
  • examples of the zinc ion supply compound include zinc sulfate, zinc chloride, and zinc nitrate
  • examples of the nitrate ion supply compound include sodium nitrate and potassium nitrate.
  • a zinc-based oxide is formed on the surface of the steel sheet.
  • the zinc-based oxide of the present invention has no peak in the vicinity of 494 eV, and a peak is recognized only in the vicinity of 499 and 500 eV. From this peak, it becomes clear that the zinc-based oxide is a zinc-based oxide. Furthermore, when analysis in the depth direction (from the surface layer to the base steel plate interface) is performed by ion etching, in the present invention, the zinc-based oxide has no peak in the vicinity of 494 eV at any depth, 499, A peak is recognized only in the vicinity of 500 eV, and the entire coating becomes a zinc-based oxide.
  • the amount to 70mg / m 2 ⁇ 500mg / m 2 by metal zinc terms is one of the most important requirements in the present invention.
  • the effect of zinc-based oxide formation is sufficiently obtained. It is possible to obtain a steel sheet that is exhibited and excellent in chemical conversion treatment and mold galling resistance.
  • the mechanism of improving chemical conversion treatment by forming zinc-based oxides is not clear, but is thought to be due to the promotion of nucleation during chemical conversion treatment by forming zinc-based oxides on the steel sheet surface. .
  • the zinc-based oxide formed between the mold during pressing and the steel sheet has a high melting point, and therefore has the effect of suppressing adhesion. Have.
  • mold galling resistance is improved.
  • the amount of zinc-based oxide formed on the surface of the steel sheet is less than 70 mg / m 2 , the nucleation sites during the chemical conversion treatment cannot be sufficiently supplied, and the chemical conversion treatment improvement effect is small.
  • the amount of zinc-based oxide formed on the surface of the steel sheet is more than 500 mg / m 2 , the zinc-based oxide itself undergoes deformation, although the adhesion between the mold and the steel sheet during pressing is suppressed.
  • the desorption amount of the system oxide increases, and the desorbed zinc-based oxide becomes the sliding resistance.
  • the zinc-based oxide for stably improving the chemical conversion treatment property and the mold galling resistance is 70 mg / m 2 to 500 mg / m 2 , preferably 100 to 300 mg / m 2 .
  • the formation amount of the zinc-based oxide is calculated by measuring the intensity of Zn using fluorescent X-rays and comparing it with the intensity of the known Zn quantity.
  • the coverage of the steel sheet surface of zinc-based oxide is 60% or more. This is also one of the important requirements in the present invention. By setting the coverage to 60% or more, it becomes possible to improve the chemical conversion property and the mold galling resistance. When the coverage is less than 60%, when the steel sheet is processed, the press mold and the base steel sheet are in direct contact with each other, so that micro adhesion occurs, the friction coefficient increases, and the press formability decreases. .
  • the coverage of the zinc-based oxide means the area ratio of the zinc-based oxide covering the surface of the steel sheet. Specifically, the coverage is 100 ⁇ m square using an electron beam microanalyzer. Zinc element mapping is performed, and it can be calculated from the measurement area (10000 ⁇ m 2 ) by the ratio of the existing area of zinc.
  • the steel plate After the electrolytic treatment using the steel plate as a cathode to form a zinc-based oxide on the steel plate surface, the steel plate is brought into contact with an aqueous solution containing phosphorus. This is also an important requirement.
  • the normal chemical conversion treatment is performed in the order of alkali degreasing ⁇ surface adjustment ⁇ phosphate treatment. In the first alkaline degreasing step, it is necessary to remove rust preventive oil applied to the steel sheet, press washing oil frequently used during press molding of the automobile body outer plate, and the like.
  • a zinc-based oxide film is formed on the steel sheet, it is brought into contact with (for example, immersed in) a phosphorus-containing aqueous solution.
  • a phosphorus-containing aqueous solution By dipping in a phosphorus-containing aqueous solution, a small amount of phosphorus adheres to the surface, which makes it possible to sufficiently degrease even when considering the deterioration of the alkaline degreasing solution.
  • OH groups are present in some of the zinc-based oxides, and it is considered that degreasing is difficult because the OH groups enhance the affinity with oil.
  • the aqueous solution containing phosphorus is not particularly limited as long as it contains phosphorus. There is no particular limitation as long as it contains at least one phosphorus compound selected from phosphoric acid, condensed phosphoric acid, phosphorous acid, hypophosphorous acid, or salts thereof.
  • orthophosphoric acid pyrophosphoric acid, trimetaphosphoric acid, tetrametaphosphoric acid, hexametaphosphoric acid, ammonium dihydrogen phosphate, diammonium hydrogen phosphate, triammonium phosphate, sodium dihydrogen phosphate, disodium hydrogen phosphate , Trisodium phosphate, sodium pyrophosphate, aluminum phosphate, ammonium hypophosphite, ammonium phosphite, triammonium phosphate, and the like.
  • the phosphorus content in the aqueous solution containing phosphorus is preferably 5 to 5000 mass ppm. If it is less than 5 mass ppm, the effect of adsorbing phosphorus on the steel sheet surface may not be sufficient. Moreover, when it exceeds 5000 massppm, an effect will be saturated and the increase in chemical
  • the pH of the aqueous solution containing phosphorus is preferably 4-12. If it is less than 4, the zinc-based oxide is easily dissolved, and the effect of improving mold galling resistance and chemical conversion treatment properties may be impaired. On the other hand, even when the pH exceeds 12, the amount of dissolution of the zinc-based oxide increases, so that the effect of improving mold galling resistance and chemical conversion treatment properties may be impaired.
  • the pH is not within the above range, it is possible to adjust the pH within the above range by slightly adding an acid such as phosphoric acid, hydrochloric acid or sulfuric acid, or an alkali such as sodium hydroxide, or diluting with water. it can.
  • the temperature of the aqueous solution containing phosphorus is preferably in the range of 20 to 70 ° C. If it is lower than 20 ° C., it may be difficult to complete phosphorus adsorption in a short time. On the other hand, when the temperature exceeds 70 ° C., not only the phosphorus adsorption effect is saturated, but also the aqueous solution containing phosphorus is likely to be dried and unevenness in appearance is likely to occur.
  • the washing time is preferably in the range of 1 to 10 seconds. If it is less than 1 second, the adsorption of phosphorus may not be sufficiently completed.
  • the treatment exceeding 10 seconds not only lengthens the production line, but also dissolution of zinc oxide by an aqueous solution containing phosphorus may occur, and a sufficient effect may not be ensured.
  • coating roll, etc. are mention
  • the method of spraying on the surface of the steel sheet is the most desirable method because it requires a small amount of processing liquid and at the same time completes processing in a relatively short time due to a synergistic effect with the fluid flow effect.
  • the amounts of zinc-based oxide and metallic zinc were measured using fluorescent X-rays as metallic zinc.
  • metal zinc plating was performed in advance to prepare a calibration plate for the Zn content by ICP and the Zn intensity by fluorescent X-rays, and the zinc content was measured.
  • the coverage of the zinc-based oxide was subjected to 100 ⁇ m square zinc element mapping using an electron beam microanalyzer, and the ratio of the existing area of zinc (coverage) was calculated from the measurement area.
  • mold galling resistance and chemical conversion property were evaluated by the following methods.
  • FIG. 2 is a schematic perspective view showing the bead shape and dimensions used in the evaluation of mold galling resistance.
  • the bead 6 slides with its lower surface pressed against the surface of the sample 1.
  • the mold galling resistance evaluation test condition is that the same part of the sample 1 coated with the cleaning oil Preton R352L for press manufactured by Sugimura Chemical Co., Ltd. on the surface before the test is repeatedly subjected to a sliding test of up to 40 times, and the number of sliding is possible. Therefore, it was used as an index of anti-mold galling resistance.
  • the number of slidable times is set so that the friction coefficient measuring device automatically stops when the steel sheet and the mold adhere to each other, that is, when die galling occurs. It was set to stop when F exceeded 500 kgf.
  • X The slidable number of times is less than 17 times (the friction coefficient measuring device is stopped due to the occurrence of mold galling).
  • ⁇ The slidable number of times is 17 to 29 times (the friction coefficient measuring device is stopped due to the occurrence of mold galling).
  • A: 30 times of sliding is possible.
  • the number of sliding times is 17 times.
  • the above-mentioned mold galling resistance is applied to a 270 MPa class cold-rolled steel sheet that is used without generating galling with a pressing load of 400 kgf. This is the average number of times that mold galling occurs when evaluation is performed. If it is possible to slide 17 times or more, it is considered that mold galling will not occur in practice, so the number of sliding is based on 17 or more. .
  • ⁇ Two or less micro skeins and / or three or more coarse crystals are observed.
  • Double-circle There is no scale in a chemical conversion treatment crystal, and there are two or less coarse crystals.
  • the size of the above-described micro scale is 200 ⁇ m 2 or less.
  • the coarse crystal is defined as a chemical conversion crystal having a long side of 15 ⁇ m or more.
  • No. 1 to 6 are the results of comparison by changing the amount of zinc oxide by changing the energization time. No. 1, no. In Comparative Examples 1 and 2 of 2, since the amount of the zinc-based oxide is small, it can be seen that the chemical conversion property is poor. No. It can be seen that Comparative Example 3 of No. 6 has a low resistance to mold galling due to the large amount of zinc-based oxide. On the other hand, no.
  • Examples 9 to 14 are examples in the case where the water-washing treatment is not performed with the aqueous solution containing phosphorus or the phosphorus content is changed. No washing with an aqueous solution containing phosphorus. It can be seen that Comparative Examples 5 and 6 of 9 and 10 have poor chemical conversion properties. On the other hand, no. 4 and no. Invention Examples 2 and 5 to 8 of Nos. 11 to 14 are washed with an aqueous solution containing phosphorus under suitable conditions, and it can be seen that the chemical conversion treatment property and the mold galling resistance are excellent. (4) Invention Examples 9 to 11 of Nos. 15 to 17 are examples in which the pH of the water washing treatment was changed with an aqueous solution containing phosphorus.
  • ADVANTAGE OF THE INVENTION it is possible to suppress die galling during press molding, to provide a steel sheet that exhibits good chemical conversion treatment during subsequent chemical conversion treatment, and can be applied in a wide range of fields centering on automobile body applications. Become.

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  • Engineering & Computer Science (AREA)
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PCT/JP2012/068744 2012-07-18 2012-07-18 Procédé permettant de produire une tôle d'acier qui présente d'excellentes propriétés de conversion chimique et une excellente résistance au grippage Ceased WO2014013623A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CN201280074788.XA CN104471115A (zh) 2012-07-18 2012-07-18 化学转化处理性及耐粘模性优良的钢板的制造方法
KR1020147036256A KR20150014517A (ko) 2012-07-18 2012-07-18 화성 처리성 및 내형골링성이 우수한 강판의 제조 방법
PCT/JP2012/068744 WO2014013623A1 (fr) 2012-07-18 2012-07-18 Procédé permettant de produire une tôle d'acier qui présente d'excellentes propriétés de conversion chimique et une excellente résistance au grippage

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PCT/JP2012/068744 WO2014013623A1 (fr) 2012-07-18 2012-07-18 Procédé permettant de produire une tôle d'acier qui présente d'excellentes propriétés de conversion chimique et une excellente résistance au grippage

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CA3003673C (fr) * 2015-05-07 2021-02-23 Phosfan Ltd Procede d'application de revetements a cristaux de conversion de phosphate ultrafins
JP6699633B2 (ja) * 2017-07-25 2020-05-27 Ｊｆｅスチール株式会社 塗装後耐食性と耐遅れ破壊特性に優れた高強度冷延鋼板及びその製造方法
CN117535653A (zh) 2022-08-01 2024-02-09 宝山钢铁股份有限公司 一种用于高强钢可磷化性能改善的环保水基处理剂

Citations (4)

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Publication number Priority date Publication date Assignee Title
JPS6425988A (en) * 1987-07-21 1989-01-27 Kawasaki Steel Co Production of zn alloy electroplated steel sheet having superior chemical treatability
JPH0488196A (ja) * 1990-08-01 1992-03-23 Nippon Steel Corp プレス成形性、化成処理性に優れた亜鉛系めっき鋼板
JP2008081808A (ja) * 2006-09-28 2008-04-10 Jfe Steel Kk 化成処理性および耐型かじり性に優れた鋼板
JP2012167362A (ja) * 2011-01-25 2012-09-06 Jfe Steel Corp 化成処理性および塗装後耐食性に優れた冷延鋼板の製造方法

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Publication number Priority date Publication date Assignee Title
US5525431A (en) * 1989-12-12 1996-06-11 Nippon Steel Corporation Zinc-base galvanized sheet steel excellent in press-formability, phosphatability, etc. and process for producing the same
MX2009002482A (es) * 2006-10-31 2009-05-11 Jfe Steel Corp Lamina de acero galvanizada tratada con fosfato y metodo para elaborar la misma.
EP2366812B1 (fr) * 2008-12-16 2019-08-14 JFE Steel Corporation Procédé de production d'une tôle d' acier galvanisé

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6425988A (en) * 1987-07-21 1989-01-27 Kawasaki Steel Co Production of zn alloy electroplated steel sheet having superior chemical treatability
JPH0488196A (ja) * 1990-08-01 1992-03-23 Nippon Steel Corp プレス成形性、化成処理性に優れた亜鉛系めっき鋼板
JP2008081808A (ja) * 2006-09-28 2008-04-10 Jfe Steel Kk 化成処理性および耐型かじり性に優れた鋼板
JP2012167362A (ja) * 2011-01-25 2012-09-06 Jfe Steel Corp 化成処理性および塗装後耐食性に優れた冷延鋼板の製造方法

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