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Galvanized steel sheet trivalent chromium passivator concentrated solution and preparation method

A technology of galvanized steel plate and trivalent chromium, which is applied in the coating process of metal materials, etc., can solve the problems of difficult control of passivation process, unstable product quality, poor corrosion resistance of passivation film, etc., and achieve uniform and stable film formation, The effect of long corrosion resistance and stable film structure

Active Publication Date: 2016-05-18
宜昌鑫汇船舶修造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing trivalent chromium passivation process has defects such as unstable product quality, short passivation solution life, difficult control of the passivation process, and poor corrosion resistance of the passivation film.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A concentrated solution of trivalent chromium passivation agent for galvanized steel sheets, consisting of the following raw materials in parts by weight: 8 parts of chromium nitrate, 15 parts of chromium dihydrogen phosphate, 4 parts of phosphoric acid, 8 parts of sealing agent acidic silica sol, 1 part of sodium hypophosphite 1 part, 1 part of cobalt nitrate, 1 part of maleic acid, 62 parts of deionized water.

Embodiment 2

[0023] A concentrated solution of trivalent chromium passivating agent for galvanized steel sheets, consisting of the following raw materials in parts by weight, 7 parts of chromium nitrate, 20 parts of chromium dihydrogen phosphate, 1 part of nitric acid, 3 parts of phosphoric acid, 5 parts of sealing agent acidic silica sol, 0.5 parts of sodium hypophosphite, 2 parts of cobalt nitrate, 2 parts of malic acid, 61.5 parts of deionized water.

Embodiment 3

[0025] A concentrated solution of trivalent chromium passivation agent for galvanized steel sheets, consisting of the following raw materials in parts by weight: 10 parts of chromium nitrate, 13 parts of chromium dihydrogen phosphate, 4 parts of sulfuric acid, 6 parts of sealing agent acidic silica sol, and 0.5 parts of sodium hypophosphite 1 part, 1 part of cobalt nitrate, 1 part of maleic acid, 1 part of citric acid, 63.5 parts of deionized water.

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PUM

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Abstract

The invention discloses a galvanized steel sheet trivalent chromium passivator concentrated solution. The galvanized steel sheet trivalent chromium passivator concentrated solution is mainly prepared from 5-10 parts of chromic nitrate, 10-20 parts of chromium dihydrogen phosphate, 1-5 parts of inorganic acid, 5-10 parts of sealing agent acidic silica sol, 0.5-2 parts of sodium hypophosphite, 0.5-2 parts of cobalt nitrate, 0.1-2 parts of complexing agent organic acid and 50-65 parts of deionized water. A trivalent chromium passivator can achieve continuous passivation film formation on the surface of an automotive hot-dip galvanized steel sheet, the passivation reaction time is short, the salt spray resisting time of a film is long, and the galvanized steel sheet trivalent chromium passivator concentrated solution is suitable for workpiece treatment through automotive hot-dip galvanized steel sheet dipping and roller coating and especially suitable for the continuous passivation process.

Description

technical field [0001] The invention relates to a trivalent chromium passivation agent, in particular to a concentrated liquid of the trivalent chromium passivation agent for galvanized steel sheets, and belongs to the field of metal surface treatment. technical background [0002] Steel parts are usually passivated after electro-galvanizing or hot-dip galvanizing to prevent white rust in a short time. With the rise of my country's automobile industry, the large-scale automobile industry's demand for steel plates continues to increase, and at the same time, the requirements for plate quality and environmental protection are also increasing. This requires that a certain output must be guaranteed and the environmental protection requirements of various countries must be met when processing the plates. The traditional hexavalent chromium color passivation agent has caused serious pollution to the environment, and more and more trivalent chromium passivation agents are used in ...

Claims

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Application Information

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IPC IPC(8): C23C22/07C23C22/08
CPCC23C22/07C23C22/08C23C2222/10
Inventor 李德江李永双
Owner 宜昌鑫汇船舶修造有限公司
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