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A method for electrophoresis treatment of castings

A technology of electrophoretic treatment and casting, which is applied in the direction of electrophoretic plating, electrolytic paint, coating, etc., and can solve the problems of many pores, the pores of workpieces are prone to corrosion, and the surface of workpieces is rough.

Active Publication Date: 2017-07-14
BAOHUA SEMI TRAILER FITTINGS CO LTD ZHENJIANG CITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The casting is limited by the casting process, the surface of the workpiece is rough, and there are many pores. In the prior art, electrophoresis is usually used to treat the surface of the casting. With the traditional simple electrophoresis treatment method, the pores of the workpiece cannot be completely closed after electrophoresis, and the moisture in the air It is easy to oxidize and corrode it through the paint film, so it does not take long for the workpiece to rust from the inside to the outside. At the same time, the liquid residue generated in the pretreatment process will also easily cause corrosion in the pores of the workpiece. Therefore, the traditional electrophoresis treatment method workpiece electrophoresis The anti-rust performance of the rear is poor, and the neutral salt spray test time can only reach more than 100 hours, which cannot meet the needs of customers

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The casting electrophoresis treatment method of the present invention comprises the following steps:

[0027] A. Degreasing

[0028] Degrease the castings with an alkaline washing solution with a total alkalinity of 17PT;

[0029] B. Washing

[0030] Clean the residual lye on the surface of the degreasing casting by washing with water;

[0031] C. Triethanolamine passivation treatment

[0032] First, add water according to the concentration of purchased triethanolamine to prepare a triethanolamine solution, so that the pH value of the triethanolamine solution is within the range of 10±0.5. If the pH value is lower than the standard value during use, add an appropriate amount of triethanolamine stock solution. On the contrary, add water to keep the pH value within the standard range. If the pH value cannot be adjusted, the tank should be cleared and the triethanolamine solution re-deployed; then, the casting should be immersed in the triethanolamine solution for passi...

Embodiment 2

[0045] The casting electrophoresis treatment method of the present invention comprises the following steps:

[0046] A. Degreasing

[0047] Degrease the castings with an alkaline washing solution with a total alkalinity of 31PT;

[0048] B. Washing

[0049] Clean the residual lye on the surface of the degreasing casting by washing with water;

[0050] C. Triethanolamine passivation treatment

[0051] First, add water according to the concentration of triethanolamine to prepare a triethanolamine solution, so that the pH value of the triethanolamine solution is within the range of 10 ± 0.5, and then immerse the casting in the triethanolamine solution for passivation treatment;

[0052] D. Washing residue

[0053] Use water washing to remove the surface residue of the passivated casting;

[0054] E. Phosphating treatment

[0055] Use a phosphating solution with a pH value of 4 and a conductivity of 1000±100 to carry out phosphating treatment on the casting; F, washing with ...

Embodiment 3

[0064] The casting electrophoresis treatment method of the present invention comprises the following steps:

[0065] A. Degreasing

[0066] Degrease the castings with an alkaline washing solution with a total alkalinity of 24PT;

[0067] B. Washing

[0068] Clean the residual lye on the surface of the degreasing casting by washing with water;

[0069] C. Triethanolamine passivation treatment

[0070] First, add water according to the concentration of triethanolamine to prepare a triethanolamine solution, so that the pH value of the triethanolamine solution is within the range of 10±0.5. If the pH value is lower than the standard value during use, add an appropriate amount of triethanolamine stock solution, otherwise Add water to keep the pH value within the standard range. If the pH value cannot be adjusted, the tank should be cleared and the triethanolamine solution re-deployed; then, the casting should be immersed in the triethanolamine solution for passivation treatment;...

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PUM

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Abstract

The invention discloses an electrophoresis treatment method for castings. It includes the following steps: A, degreasing B, water washing; C, triethanolamine passivation treatment, adding water according to the concentration of triethanolamine to prepare a triethanolamine solution, immersing the casting in the triethanolamine solution for passivation treatment; D, washing residue , E, phosphating treatment, F, water washing, use water washing to remove the surface residue of the phosphating casting; G, electrophoresis, H, pure water washing, use deionized water washing to process the surface residue of the casting More than twice cleaning process; 1, drying. After adopting the method of the present invention, the antirust performance of castings has been greatly improved. In particular, the triethanolamine soaking process is added in the process, which effectively improves the thickness of phosphating film and electrophoretic paint film, and makes the pores and rough surface of castings The sealing performance is improved, the anti-rust ability of the workpiece after electrophoresis is obviously improved, and the neutral salt spray test time can reach more than 300 hours, which can basically meet the requirements of customers.

Description

technical field [0001] The invention relates to a treatment method for steel castings and workpieces with rough surfaces and many pores, in particular to an electrophoresis treatment method for castings using a triethanolamine solution. Background technique [0002] The casting is limited by the casting process, the surface of the workpiece is rough, and there are many pores. In the prior art, electrophoresis is usually used to treat the surface of the casting. With the traditional simple electrophoresis treatment method, the pores of the workpiece cannot be completely closed after electrophoresis, and the moisture in the air It is easy to oxidize and corrode it through the paint film, so it does not take long for the workpiece to rust from the inside to the outside. At the same time, the liquid residue generated in the pretreatment process will also easily cause corrosion in the pores of the workpiece. Therefore, the traditional electrophoresis treatment method workpiece ele...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D13/20C25D13/00
Inventor 郑辉
Owner BAOHUA SEMI TRAILER FITTINGS CO LTD ZHENJIANG CITY