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Electrolytic zinc blackening control method

A control method, electro-galvanizing technology, applied in electrolytic process, electrolytic components, cells, etc., can solve problems such as blackening of galvanized steel, and achieve the effect of improving the quality of protection

Inactive Publication Date: 2020-02-11
SHENYANG AEROSPACE XINGUANG GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention aims at the problems existing in the above-mentioned prior art, and provides a method for controlling the blackening of electro-galvanized steel, which solves the problem of blackening of galvanized steel and improves the anti-corrosion performance of galvanized steel

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  • Electrolytic zinc blackening control method

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Embodiment

[0032] A method for controlling blackening of electro-galvanized coatings, comprising the steps of:

[0033] Step 1, degreasing: put the workpiece into gasoline or industrial alcohol with a mass concentration of 90% and soak it at room temperature for 5-10 minutes to remove surface oil stains; then perform electrolytic degreasing;

[0034] Step 2, hot water washing: Use hot water at 90°C-100°C to clean the surface of the workpiece for 30-60s to remove residual lye and salt on the surface of the workpiece;

[0035] Step 3, rust removal: use rust removal solution to remove rust on the surface of the workpiece;

[0036] Step 4, cold water washing: use 15-20°C running cold water for countercurrent rinsing for 30-60s;

[0037] Step 5, deionized water washing: before entering the galvanizing tank, the workpiece is cleaned with deionized water at 15°C-30°C for 30-60s to ensure that no other ions on the surface of the workpiece enter the plating tank;

[0038] Step 6, galvanizing: u...

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Abstract

The invention relates to an electrolytic zinc blackening control method. The electrolytic zinc blackening control method comprises the steps of oil removing, hot water washing, rust removing, cold water washing, deionized water washing, galvanization, drying and storage. An electrolytic zinc blackening control measure is determined, the protective quality of a zinc coating on a product is also improved, and the electrolytic zinc blackening control method has very important value for reaching of an electrolytic zinc layer.

Description

technical field [0001] The invention relates to a method for controlling the blackening of electrogalvanizing. Background technique [0002] After electro-galvanizing is stored under high-temperature and high-humidity conditions for a period of time, a fine, continuous and slightly metallic black or dark brown film is formed on the surface, which is the blackening phenomenon of electro-galvanizing. The blackening phenomenon is essentially an initial corrosion phenomenon, which is caused by the crevice corrosion products of oxygen-deficient zinc oxide formed on the outermost layer of zinc in a high temperature and high humidity environment; it seriously affects the appearance of the product and reduces the Cohesion of the paint layer. Contents of the invention [0003] Aiming at the problems existing in the above-mentioned prior art, the present invention provides a method for controlling blackening of electro-galvanized steel, which solves the problem of blackening of gal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D3/22C25D5/34C25D5/48C25D21/12
CPCC25D3/22C25D5/34C25D5/48C25D21/12
Inventor 李冬徐晶姜波
Owner SHENYANG AEROSPACE XINGUANG GRP
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