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Zinc-plating black passivating agent and zinc-plating passivating method

A passivating agent and black technology, applied in the coating process of metal materials, etc., can solve the problems of long passivation time, high production cost, and great influence on the economic benefits of galvanizing enterprises, and achieve good blackening effect and good durability The effect of salt spray

Inactive Publication Date: 2018-11-13
广州传福化学技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the chromium-free formula has disadvantages such as poor corrosion resistance, limited application range, and long passivation time, and a long passivation time will bring higher production costs, which has a great impact on the economic benefits of galvanizing enterprises. Big

Method used

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  • Zinc-plating black passivating agent and zinc-plating passivating method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Proportion of passivating agent formula: chromium nitrate 20g / L, cobalt sulfate 6g / L, sodium nitrate 8g / L, dithiol diacetic acid 6ml / L, maleic acid 4g / L, maleic acid 3g / L, Citric acid 2g / L, sodium hydroxide 4g / L, the balance is water.

[0037] The galvanizing passivation method includes the following steps:

[0038] (1) Stir and dissolve the above-mentioned galvanized black passivator formula in water, adjust the pH to 2.0-2.4 with a pH regulator, and use it for later use;

[0039] (2) After galvanizing, perform three-level water washing, then 0.2-0.5% nitric acid to emit light, then water washing, and then passivation with galvanized black passivator at a temperature of 15-30 ℃, passivation time is 40-60 Seconds, after passivation, it is washed with three-stage water, then dried, sealed (the zinc acid can be used in the rack), and then dried again.

Embodiment 2

[0041] Proportion of passivating agent formula: chromium nitrate 25g / L, cobalt sulfate 5g / L, sodium nitrate 10g / L, dithiolacetic acid 5ml / L, maleic acid 3.5g / L, maleic acid 2.8g / L. Citric acid 1.5g / L, sodium hydroxide 3.8g / L, the balance is water.

[0042] The galvanizing passivation method includes the following steps:

[0043] (1) Stir and dissolve the above-mentioned galvanized black passivator formula in water, adjust the pH to 2.0-2.4 with a pH regulator, and use it for later use;

[0044] (2) After galvanizing, perform three-level water washing, then 0.2-0.5% nitric acid to emit light, then water washing, and then passivation with galvanized black passivator at a temperature of 15-30 ℃, passivation time is 40-60 Seconds, after passivation, it is washed with three-stage water, then dried, sealed (the zinc acid can be used in the rack), and then dried again.

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Abstract

The invention provides a zinc-plating black passivating agent and a zinc-plating passivating method. The zinc-plating black passivating agent is prepared from, by weight, 20-30 parts of chromic nitrate, 3-7 parts of cobaltous sulfate, 8-12 parts of sodium nitrate, 4-6 parts of blackening agent, 3-4 parts of cis-butenedioic acid, 2-3.5 parts of maleic acid, 1-7 parts of citric acid, 3-4.5 parts ofsodium hydroxide and the balance water, wherein the blackening agent is dithiodiglycollic acid or disulfide diacetate. The zinc-plating black passivating agent has a good blackening effect and good salt fog resistance.

Description

Technical field [0001] The invention belongs to the technical field of electroplating chemistry, and specifically relates to a galvanizing black passivator and a galvanizing passivation method. Background technique [0002] Electro-galvanizing is an effective way to improve the corrosion resistance of steel parts, and is widely used in many fields such as construction, transportation, machinery, electronics, and aviation. However, in a humid environment, the galvanized layer is prone to corrosion, causing the surface of the coating to form a dark gray or white loose corrosion product called white rust; red rust will appear after a long time, thereby losing the anti-corrosion effect. In order to improve the corrosion resistance of the coating, it is necessary to electrogalvanize the steel parts, and the parts are immersed in a passivation solution for passivation treatment to form a dense passivation film on the surface of the galvanized layer, thereby further improving the corros...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/53C25D5/48C25D3/22
CPCC23C22/53C25D3/22C25D5/48
Inventor 黎效传刘信
Owner 广州传福化学技术有限公司