SU136148A1 - The method of passivation of steel and iron parts before electroplating - Google Patents
The method of passivation of steel and iron parts before electroplatingInfo
- Publication number
- SU136148A1 SU136148A1 SU647231A SU647231A SU136148A1 SU 136148 A1 SU136148 A1 SU 136148A1 SU 647231 A SU647231 A SU 647231A SU 647231 A SU647231 A SU 647231A SU 136148 A1 SU136148 A1 SU 136148A1
- Authority
- SU
- USSR - Soviet Union
- Prior art keywords
- passivation
- steel
- iron parts
- parts before
- before electroplating
- Prior art date
Links
- 238000000034 method Methods 0.000 title description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title description 6
- 238000002161 passivation Methods 0.000 title description 6
- 229910000831 Steel Inorganic materials 0.000 title description 5
- 239000010959 steel Substances 0.000 title description 5
- 238000009713 electroplating Methods 0.000 title description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 6
- 238000000576 coating method Methods 0.000 description 3
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 229910017604 nitric acid Inorganic materials 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Landscapes
- Electroplating Methods And Accessories (AREA)
Description
Существующие способы пассивации стальных и железных изделий имеют р д недостатков. Так пассиваци в концентрированной азотной кислоте проходит удовлетворительно только, при 2-3° ниже нул . Кроме того, при промывке деталей концентрированна азотна кислота разбавл етс и раствор ет пассивную пленку. Раствор серной кислоты с хромником сравнительно быстро тер ет свойства хорощего иассиватора.Existing methods for the passivation of steel and iron products have a number of drawbacks. So passivation in concentrated nitric acid is satisfactory only, at 2-3 ° below zero. In addition, when washing parts, concentrated nitric acid is diluted and dissolves the passive film. A solution of sulfuric acid with chromium loses the properties of a good iassivator relatively quickly.
Предложенный способ пассивации стальных и железных деталей лищен указанных недостатков и обеспечивает высокое качество гальванических покрытий, снижа их пористость.The proposed method of passivation of steel and iron parts is free of these disadvantages and provides high quality electroplating coatings, reducing their porosity.
Преимущества предложенного способа достигаютс тем, что дл пассивации стальных и железных деталей примен ют раствор, содержащий 500-560 г/л едкого натра.The advantages of the proposed method are achieved by using a solution containing 500-560 g / l of sodium hydroxide to passivate steel and iron parts.
Процесс пассивации в таком растворе провод т при анодной плотности тока равной 4-5 а/дм и температуре 50-60°. Длительность процесса составл ет 20-30 сек.The passivation process in such a solution is carried out at an anodic current density of 4-5 A / dm and a temperature of 50-60 °. The duration of the process is 20-30 seconds.
Проведенные испытани показали, что пористость, например, олов нных покрытий, полученных в кислых электролитах после предварительной обработки в предложенном пассиваторе по указанной технологии , значительно уменьщилась, а коррозионна устойчивость резко возросла.Conducted tests showed that the porosity of, for example, tin coatings obtained in acidic electrolytes after pretreatment in the proposed passivator according to this technology, decreased significantly, and corrosion resistance increased sharply.
Пред.VI ет изобретени Prev.VI et inventions
Способ пассивации стальных и железных деталей перед нанесением гальванических покрытий, отличающийс тем, что, с целью снижени пористости покрытий, обработку деталей ведут в растворе, содержащем 500-560 г/л едкого натра при температуре 50-60° и анодной плотности тока 4-5 а/дм- в течение 20-30 сек.The method of passivation of steel and iron parts before electroplating, characterized in that, in order to reduce the porosity of the coatings, the parts are processed in a solution containing 500-560 g / l of sodium hydroxide at a temperature of 50-60 ° and anode current density of 4-5 a / dm - for 20-30 seconds.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SU647231A SU136148A1 (en) | 1959-12-12 | 1959-12-12 | The method of passivation of steel and iron parts before electroplating |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SU647231A SU136148A1 (en) | 1959-12-12 | 1959-12-12 | The method of passivation of steel and iron parts before electroplating |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| SU136148A1 true SU136148A1 (en) | 1960-11-30 |
Family
ID=48292437
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| SU647231A SU136148A1 (en) | 1959-12-12 | 1959-12-12 | The method of passivation of steel and iron parts before electroplating |
Country Status (1)
| Country | Link |
|---|---|
| SU (1) | SU136148A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4110181A (en) * | 1975-10-08 | 1978-08-29 | Solvay & Cie | Method of handling aqueous solutions of alkali metal hydroxides that are concentrated in respect of alkali metal halides |
-
1959
- 1959-12-12 SU SU647231A patent/SU136148A1/en active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4110181A (en) * | 1975-10-08 | 1978-08-29 | Solvay & Cie | Method of handling aqueous solutions of alkali metal hydroxides that are concentrated in respect of alkali metal halides |
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