CN111218692A - Surface treatment method for metal die casting - Google Patents
Surface treatment method for metal die casting Download PDFInfo
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- CN111218692A CN111218692A CN202010142584.1A CN202010142584A CN111218692A CN 111218692 A CN111218692 A CN 111218692A CN 202010142584 A CN202010142584 A CN 202010142584A CN 111218692 A CN111218692 A CN 111218692A
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- 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
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/14—Cleaning or pickling metallic material with solutions or molten salts with alkaline solutions
-
- 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
- C23C22/05—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 using aqueous solutions
- C23C22/06—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 using aqueous solutions using aqueous acidic solutions with pH less than 6
- C23C22/40—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 using aqueous solutions using aqueous acidic solutions with pH less than 6 containing molybdates, tungstates or vanadates
-
- 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
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- 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
- C23C22/82—After-treatment
-
- 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
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F1/00—Etching metallic material by chemical means
- C23F1/10—Etching compositions
- C23F1/14—Aqueous compositions
- C23F1/32—Alkaline compositions
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
- ing And Chemical Polishing (AREA)
- Chemical Treatment Of Metals (AREA)
Abstract
The invention relates to a surface treatment method of a metal die casting, which comprises the following specific steps: (1) degreasing treatment; (2) etching treatment; (3) neutralizing; (4) activating treatment; (5) formation treatment; (6) hole sealing treatment; (7) and (5) drying. The treatment method is simple, easy to operate, convenient to maintain, low in energy consumption, good in stability, small in product corrosivity, particularly suitable for 3C products, high in product qualification rate, very suitable for industrial flow line production, and widely applied to production, and the treated workpiece has super-strong corrosion resistance, good conductivity and excellent coating binding force.
Description
Technical Field
The invention relates to the field of surface treatment, in particular to a surface treatment method for a metal die casting.
Background
Conventionally, a surface treatment method for a metal die casting such as a magnesium alloy is known in which rust removal and degreasing treatment is performed in a film pretreatment step. The existing derusting and degreasing processes usually use solutions mainly containing acidic solvents for treatment, and the solutions contain harmful elements such as chromium, manganese, zirconium, fluorine and the like, so that the solutions are not environment-friendly, and waste water generated after treatment is not easy to treat. Particularly, when the screw teeth of the electronic part 3C product are treated, the product is easy to damage, and meanwhile, the corrosion resistance of the treated product is poor.
Disclosure of Invention
The invention aims to: the method for treating the surface of the metal die casting is environment-friendly, and the treated workpiece greatly improves the corrosion resistance of the workpiece.
In order to achieve the above purpose, the invention provides the following technical scheme:
a surface treatment method of a metal die casting comprises the following specific steps:
(1) degreasing treatment;
(2) etching treatment;
(3) neutralizing;
(4) activating treatment;
(5) formation treatment;
(6) hole sealing treatment;
(7) and (5) drying.
Preferably, the metal die casting is a magnesium alloy die casting.
Preferably, the degreasing treatment in the step (1) comprises the following specific steps: placing the metal die casting in the mixed solution I, and treating at 70 +/-5 ℃ for 500-700 seconds;
the mixed solution I is a mixed solution of a sodium hydroxide aqueous solution and a trisodium phosphate aqueous solution, the concentration of the mixed solution I is 70-80g/L, the pH value is 11-13, and the mass ratio of sodium hydroxide to trisodium phosphate in the mixed solution I is 6.8: 1.
preferably, the etching treatment in step (2) comprises the following specific processes: washing the degreased workpiece with water, and then placing the degreased workpiece in the mixed solution II to treat the workpiece for 200-400 seconds at 70 +/-5 ℃;
the mixed solution II is a mixed solution of a sodium bicarbonate aqueous solution, an EDTA disodium aqueous solution and a potassium pyrophosphate aqueous solution, the concentration of the mixed solution II is 70-80g/L, the PH value is 9-12, and the mass ratio of the sodium bicarbonate to the EDTA disodium to the potassium pyrophosphate in the mixed solution II is 3: 1: 3.
preferably, the specific process of the neutralization treatment in the step (3) is as follows: washing the etched workpiece with water, and then placing the workpiece in the mixed solution III to be treated for 200-400 seconds at 70 +/-5 ℃;
the mixed solution III is a mixed solution of a trisodium phosphate aqueous solution and an EDTA disodium aqueous solution, the concentration of the mixed solution III is 70-80g/L, the pH value is 11-13, and the mass ratio of the trisodium phosphate to the EDTA disodium in the mixed solution III is 2: 1.
Preferably, the activation treatment in the step (4) comprises the following specific processes: washing the neutralized workpiece with water, and then placing the workpiece in a nitric acid solution to be treated for 50-70 seconds at normal temperature;
the mass concentration of the nitric acid solution is 0.9-1.2%, and the pH value is 1-2.
Preferably, the specific process of the formation treatment in the step (5) is as follows: washing the activated workpiece with water, and then placing the workpiece in the mixed solution IV to be treated for 150-200 seconds at the temperature of 60 +/-5 ℃;
the mixed solution IV is a mixed solution of phosphoric acid aqueous solution and ammonium vanadate aqueous solution, the mass concentration of the mixed solution IV is 0.3-1%, the PH value is 2.6-3.2, and the mass ratio of phosphoric acid to ammonium vanadate in the mixed solution IV is 3: 1.
preferably, the sealing treatment in the step (6) comprises the following specific processes: and washing the formed workpiece with water, and then placing the workpiece in a water-soluble hole sealing agent solution to be treated for 150-200 seconds at 50 +/-5 ℃.
Preferably, the mass concentration of the water-soluble hole sealing agent is 5-10%, and the PH value is 6.8-7.
Preferably, the drying temperature in the step (7) is 180 +/-5 ℃ and the time is 5-7 minutes.
The invention has the beneficial effects that:
the treating fluid used in the method for treating the metal die casting does not contain harmful elements such as chromium, manganese, zirconium, fluorine and the like, and completely meets the environmental protection regulations of European Union ROHS and China. The obtained wastewater is simple to treat, only a small amount of flocculating and precipitating agent is added after neutralization, and the problems of harm to human bodies and water pollution are solved.
The treatment method is simple, easy to operate, convenient to maintain, low in energy consumption, good in stability, small in product corrosivity, particularly suitable for 3C products, high in product qualification rate, very suitable for industrial flow line production, and widely applied to production, and the treated workpiece has super-strong corrosion resistance, good conductivity and excellent coating binding force.
The metal casting treated by the method can reach a neutral salt spray test of 24H & gt, grade 9 or more, and the conductivity is that a universal meter is less than 2.0 omega; the adhesive force with the liquid coating reaches the GB/T9286-1998 standard by the hundred-grid test. The adhesive force with the powder coating reaches the GB/T9286-1998 standard in a hundred-grid test.
DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
Example 1
A surface treatment method of a metal die casting comprises the following specific steps:
(1) degreasing treatment
Placing the metal die casting in the mixed solution I to be treated for 700 seconds at 65 ℃; the mixed solution I is a mixed solution of a sodium hydroxide aqueous solution and a trisodium phosphate aqueous solution, the concentration of the mixed solution I is 70g/L, the pH value is 11-13, and the mass ratio of sodium hydroxide to trisodium phosphate in the mixed solution I is 6.8: 1.
(2) etching treatment
Washing the degreased workpiece twice, and then placing the degreased workpiece in the mixed solution II to treat the workpiece for 400 seconds at 65 ℃; the mixed solution II is a mixed solution of a sodium bicarbonate aqueous solution, an EDTA disodium aqueous solution and a potassium pyrophosphate aqueous solution, the concentration of the mixed solution II is 70g/L, the PH value is 9-12, and the mass ratio of the sodium bicarbonate to the EDTA disodium to the potassium pyrophosphate in the mixed solution II is 3: 1: 3.
(3) neutralization treatment
Washing the etched workpiece twice, and then placing the workpiece in the mixed solution III to process for 400 seconds at 65 ℃; the mixed solution III is a mixed solution of a trisodium phosphate aqueous solution and an EDTA disodium aqueous solution, the concentration of the mixed solution III is 70g/L, the pH value is 11-13, and the mass ratio of the trisodium phosphate to the EDTA disodium in the mixed solution III is 2: 1.
(4) Activation treatment
Washing the neutralized workpiece twice, and then placing the workpiece in a nitric acid solution to be treated for 70 seconds at normal temperature; wherein the mass concentration of the nitric acid solution is 0.9 percent, and the PH value is 1-2.
(5) Chemical conversion treatment
Washing the activated workpiece twice, and then placing the workpiece in the mixed solution IV to be treated for 200 seconds at 55 ℃; wherein the mixed solution IV is a mixed solution of phosphoric acid aqueous solution and ammonium vanadate aqueous solution, the mass concentration of the mixed solution IV is 0.3%, the pH value is 2.6-3.2, and the mass ratio of phosphoric acid to ammonium vanadate in the mixed solution IV is 3: 1.
(6) hole sealing treatment
Washing the formed workpiece twice, and then placing the workpiece in a water-soluble hole sealing agent solution for treatment at 45 ℃ for 200 seconds; wherein the mass concentration of the water-soluble hole sealing agent is 5 percent, and the PH value is 6.8-7.
(7) Drying by baking
And (3) washing and drying the workpiece subjected to hole sealing treatment twice, wherein the drying temperature is 175 ℃, and the drying time is 7 minutes.
Example 2
A surface treatment method of a metal die casting comprises the following specific steps:
(1) degreasing treatment
Placing the metal die casting in the mixed solution I to be treated for 600 seconds at 70 ℃; the mixed solution I is a mixed solution of a sodium hydroxide aqueous solution and a trisodium phosphate aqueous solution, the concentration of the mixed solution I is 75g/L, the pH value is 11-13, and the mass ratio of sodium hydroxide to trisodium phosphate in the mixed solution I is 6.8: 1.
(2) etching treatment
Washing the degreased workpiece twice, and then placing the degreased workpiece in the mixed solution II to treat the workpiece for 300 seconds at 70 ℃; the mixed solution II is a mixed solution of a sodium bicarbonate aqueous solution, an EDTA disodium aqueous solution and a potassium pyrophosphate aqueous solution, the concentration of the mixed solution II is 75g/L, the PH value is 9-12, and the mass ratio of the sodium bicarbonate to the EDTA disodium to the potassium pyrophosphate in the mixed solution II is 3: 1: 3.
(3) neutralization treatment
Washing the etched workpiece twice, and then placing the workpiece in the mixed solution III to be treated for 300 seconds at 70 ℃; the mixed solution III is a mixed solution of a trisodium phosphate aqueous solution and an EDTA disodium aqueous solution, the concentration of the mixed solution III is 75g/L, the pH value is 11-13, and the mass ratio of the trisodium phosphate to the EDTA disodium in the mixed solution III is 2: 1.
(4) Activation treatment
Washing the neutralized workpiece twice, and then placing the workpiece in a nitric acid solution to be treated for 60 seconds at normal temperature; wherein the mass concentration of the nitric acid solution is 1 percent, and the PH value is 1-2.
(5) Chemical conversion treatment
Washing the activated workpiece twice, and then placing the workpiece in the mixed solution IV to be treated for 180 seconds at 60 ℃; wherein the mixed solution IV is a mixed solution of phosphoric acid aqueous solution and ammonium vanadate aqueous solution, the mass concentration of the mixed solution IV is 0.5%, the pH value is 2.6-3.2, and the mass ratio of phosphoric acid to ammonium vanadate in the mixed solution IV is 3: 1.
(6) hole sealing treatment
Washing the formed workpiece twice, and then placing the workpiece in a water-soluble hole sealing agent solution for processing for 180 seconds at 50 ℃; wherein the mass concentration of the water-soluble hole sealing agent is 8 percent, and the PH value is 6.8-7.
(7) Drying by baking
And (3) washing and drying the workpiece subjected to hole sealing treatment twice, wherein the drying temperature is 180 ℃ and the drying time is 6 minutes.
Example 3
A surface treatment method of a metal die casting comprises the following specific steps:
(1) degreasing treatment
Placing the metal die casting in the mixed solution I to be treated for 500 seconds at 75 ℃; the mixed solution I is a mixed solution of a sodium hydroxide aqueous solution and a trisodium phosphate aqueous solution, the concentration of the mixed solution I is 80g/L, the PH value is 11-13, and the mass ratio of sodium hydroxide to trisodium phosphate in the mixed solution I is 6.8: 1.
(2) etching treatment
Washing the degreased workpiece twice, and then placing the degreased workpiece in the mixed solution II to treat the workpiece for 200 seconds at 75 ℃; the mixed solution II is a mixed solution of a sodium bicarbonate aqueous solution, an EDTA disodium aqueous solution and a potassium pyrophosphate aqueous solution, the concentration of the mixed solution II is 80g/L, the PH value is 9-12, and the mass ratio of the sodium bicarbonate to the EDTA disodium to the potassium pyrophosphate in the mixed solution II is 3: 1: 3.
(3) neutralization treatment
Washing the etched workpiece twice, and then placing the workpiece in the mixed solution III to be treated for 200 seconds at 75 ℃; the mixed solution III is a mixed solution of a trisodium phosphate aqueous solution and an EDTA disodium aqueous solution, the concentration of the mixed solution III is 80g/L, the pH value is 11-13, and the mass ratio of the trisodium phosphate to the EDTA disodium in the mixed solution III is 2: 1.
(4) Activation treatment
Washing the neutralized workpiece twice, and then placing the workpiece in a nitric acid solution to be treated for 50 seconds at normal temperature; wherein the mass concentration of the nitric acid solution is 1.2 percent, and the PH value is 1-2.
(5) Chemical conversion treatment
Washing the activated workpiece twice, and then placing the workpiece in the mixed solution IV to be treated for 150 seconds at 65 ℃; wherein the mixed solution IV is a mixed solution of phosphoric acid aqueous solution and ammonium vanadate aqueous solution, the mass concentration of the mixed solution IV is 1%, the PH value is 2.6-3.2, and the mass ratio of phosphoric acid to ammonium vanadate in the mixed solution IV is 3: 1.
(6) hole sealing treatment
Washing the formed workpiece twice, and then placing the workpiece in a water-soluble hole sealing agent solution for processing at 55 ℃ for 150 seconds; wherein the mass concentration of the water-soluble hole sealing agent is 10 percent, and the PH value is 6.8-7.
(7) Drying by baking
And (3) washing and drying the workpiece subjected to hole sealing treatment twice, wherein the drying temperature is 185 ℃, and the drying time is 5 minutes.
Salt spray test
The workpiece treated by the invention is subjected to salt spray test (GB/T6461-2002 standard is adopted)
A detection instrument: salt spray testing machine
And (3) testing conditions are as follows: NaCl water solution with the mass concentration of 5 percent is used as a corrosion medium, the pH value is 6.9, the spraying pressure is 1.0Kgf, the test temperature is 35 ℃ plus or minus 2, the temperature of a saturated air cylinder is 47 ℃ plus or minus 1, the test time is 24H,
and (3) testing results: after the continuous test of 24H HNaCl aqueous solution, the sample is judged to be 10 grades according to the national standard.
Baige test
The work piece treated by the invention is subjected to a hundred-grid test (GB/T9286-1998 standard)
A detection tool: hundred-grid knife, brush, 33m600 adhesive tape and eraser
Treatment of the workpiece before testing: and (4) removing dust from the workpiece, spraying the coating, solidifying and cooling for later use.
The test method comprises the following steps:
1. and (3) marking 10X 10 (100) 1mm X1 mm small grids on the surface of the workpiece by using a hundred-grid cutter, wherein each marking line is deep and is the bottom layer of the coating.
2. The fragments of the test area were brushed clean with a brush.
3. Firmly sticking the tested small grid with 3M600 adhesive tape or adhesive paper with the same effect, and strongly wiping the adhesive tape with an eraser to increase the contact area and force between the adhesive tape and the tested area.
4. One end of the tape was grasped by hand and rapidly pulled off at 90 ° in the vertical direction and tested 2-3 times at the same location.
5. And (5) observing the damage condition of the plating layer and judging.
And (3) testing results:
when the sprayed coating is a liquid coating, the falling area of the hundred-lattice test coating of the sample is less than or equal to 5 percent, and the test is qualified;
when the sprayed coating is a powder coating, the falling area of the coating is less than or equal to 5% in the hundred-grid test of the sample, and the test is qualified.
Claims (10)
1. A surface treatment method of a metal die casting is characterized by comprising the following steps: the method comprises the following specific steps:
(1) degreasing treatment;
(2) etching treatment;
(3) neutralizing;
(4) activating treatment;
(5) formation treatment;
(6) hole sealing treatment;
(7) and (5) drying.
2. The surface treatment method of a metal die casting according to claim 1, characterized in that: the metal die casting is a magnesium alloy die casting.
3. The surface treatment method of a metal die casting according to claim 1, characterized in that: the degreasing treatment in the step (1) comprises the following specific steps: placing the metal die casting in the mixed solution I, and treating at 70 +/-5 ℃ for 500-700 seconds;
the mixed solution I is a mixed solution of a sodium hydroxide aqueous solution and a trisodium phosphate aqueous solution, the concentration of the mixed solution I is 70-80g/L, the pH value is 11-13, and the mass ratio of sodium hydroxide to trisodium phosphate in the mixed solution I is 6.8: 1.
4. the surface treatment method of a metal die casting according to claim 1, characterized in that: the etching treatment in the step (2) comprises the following specific processes: washing the degreased workpiece with water, and then placing the degreased workpiece in the mixed solution II to treat the workpiece for 200-400 seconds at 70 +/-5 ℃;
the mixed solution II is a mixed solution of a sodium bicarbonate aqueous solution, an EDTA disodium aqueous solution and a potassium pyrophosphate aqueous solution, the concentration of the mixed solution II is 70-80g/L, the PH value is 9-12, and the mass ratio of the sodium bicarbonate to the EDTA disodium to the potassium pyrophosphate in the mixed solution II is 3: 1: 3.
5. the surface treatment method of a metal die casting according to claim 1, characterized in that: the specific process of the neutralization treatment in the step (3) is as follows: washing the etched workpiece with water, and then placing the workpiece in the mixed solution III to be treated for 200-400 seconds at 70 +/-5 ℃;
the mixed solution III is a mixed solution of a trisodium phosphate aqueous solution and an EDTA disodium aqueous solution, the concentration of the mixed solution III is 70-80g/L, the pH value is 11-13, and the mass ratio of the trisodium phosphate to the EDTA disodium in the mixed solution III is 2: 1.
6. The surface treatment method of a metal die casting according to claim 1, characterized in that: the specific process of the activation treatment in the step (4) is as follows: washing the neutralized workpiece with water, and then placing the workpiece in a nitric acid solution to be treated for 50-70 seconds at normal temperature;
the mass concentration of the nitric acid solution is 0.9-1.2%, and the pH value is 1-2.
7. The surface treatment method of a metal die casting according to claim 1, characterized in that: the specific process of the formation treatment in the step (5) is as follows: washing the activated workpiece with water, and then placing the workpiece in the mixed solution IV to be treated for 150-200 seconds at the temperature of 60 +/-5 ℃;
the mixed solution IV is a mixed solution of phosphoric acid aqueous solution and ammonium vanadate aqueous solution, the mass concentration of the mixed solution IV is 0.3-1%, the PH value is 2.6-3.2, and the mass ratio of phosphoric acid to ammonium vanadate in the mixed solution IV is 3: 1.
8. the surface treatment method of a metal die casting according to claim 1, characterized in that: the specific process of the sealing treatment in the step (6) is as follows: and washing the formed workpiece with water, and then placing the workpiece in a water-soluble hole sealing agent solution to be treated for 150-200 seconds at 50 +/-5 ℃.
9. The surface treatment method of a metal die casting according to claim 8, characterized in that: the mass concentration of the water-soluble hole sealing agent is 5-10%, and the PH value is 6.8-7.
10. The surface treatment method of a metal die casting according to claim 1, characterized in that: in the step (7), the drying temperature is 180 +/-5 ℃ and the drying time is 5-7 minutes.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115074718A (en) * | 2022-06-27 | 2022-09-20 | 敬得(苏州)科技有限公司 | Surface treatment method for metal die casting |
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| CN115074718A (en) * | 2022-06-27 | 2022-09-20 | 敬得(苏州)科技有限公司 | Surface treatment method for metal die casting |
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