Novel process for plating zinc on surface of steel casting

A casting and surface oil pollution technology, which is applied in the new process field of steel casting surface electroplating, can solve the problems of poor finish and flatness of alkaline galvanizing, high consumption of zinc plates, poor coating brightness, etc., to solve the problem of wastewater treatment, The pre-treatment of castings is simple and the effect of saving electroplating costs

Inactive Publication Date: 2010-07-14
NANJING INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Alkaline galvanizing has the disadvantages of high consumption of zinc plate, the pores on the surface of castings cannot be electroplated, the smoothness and flatness of alkaline galvanizing are not good, and the usual acid galvanizing also has some disadvantages: such as poor brightness of the coating, The bonding force between the coating and the casting is not strong, etc.
[0005] The results of the literature search show that there are few reports on the introduction of this electroplating process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Pour 150-300g of KCl with a purity of 99.5% and an appropriate amount of zinc chloride into the electroplating tank, add buffer solution, connect the casting to the electrode in a unique way, and perform pre-plating according to the fixed process flow, after 10-60 minutes , the pre-plating is over; add chemical additive A, adjust the parameters, and carry out electroplating. After 60-90 minutes, the electroplating is completed, and the post-treatment is carried out according to the regulations, rinsing, light emitting, aging, and drying. The electroplating products meet the requirements, and the electroplating products After being placed for 1 year, no acid seeps out, and no corrosion spots appear.

Embodiment 2

[0016] Pour 150-300g of KCl with a purity of 99.5% and an appropriate amount of zinc chloride into the electroplating tank, add buffer solution, add chemical additives, connect the casting to the electrode in a unique way, and perform pre-plating according to a fixed process flow. After 10-60 minutes, the pre-plating is over; adjust the parameters and perform electroplating. After 60-90 minutes, the electroplating is over, and follow the prescribed post-treatment, rinse, light, age, and dry. It is found that the plating of the electroplated product is not dense. .

Embodiment 3

[0018] Pour 150-300g of KCl with a purity of 99.5% and an appropriate amount of zinc chloride into the electroplating tank, add buffer solution, connect the casting to the electrode in a unique way, and perform pre-plating according to the fixed process flow, after 10-60 minutes , the pre-plating is finished; adjust the parameters, and carry out electroplating. After 60-90 minutes, the electroplating is finished, and the post-treatment is carried out according to the regulations, rinsing, light emitting, aging, and drying. It is found that the brightness of the electroplated product does not meet the requirements.

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PUM

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Abstract

The invention discloses a novel process for plating the surface of a steel casting. The process has the characteristics of simple process, easy control, low cost and excellent plating effect, and has no wastewater drainage at the same time. Pores on the surface of the steel casting needs no repairation before the steel casting is plated, so that the cost is greatly saved.

Description

technical field [0001] The invention relates to a new surface electroplating process of steel castings, which realizes the win-win situation of simple treatment process, low cost and excellent electroplating effect. Background technique [0002] Alkaline galvanizing has the disadvantages of high consumption of zinc plate, the pores on the surface of castings cannot be electroplated, the smoothness and flatness of alkaline galvanizing are not good, and the usual acid galvanizing also has some disadvantages: such as poor brightness of the coating, The bonding force between the coating and the casting is not strong. [0003] Potassium chloride galvanizing is one of the ammonia-free chloride galvanizing processes. Potassium chloride galvanizing process is characterized by stable plating solution, suitable for low-chromium or ultra-low-chromium passivation; easy sewage treatment; fine crystallization of the coating; good leveling; wide range of current density; good throwing abi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D3/22
Inventor 郑凯吴功德韩玉华李红艺丁克强张方章龙
Owner NANJING INST OF TECH
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