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High anti-corrosion zinc coating trivalent chromium lue-white passivating agent and its preparing method

A galvanized layer, trivalent chromium technology, applied in the direction of metal material coating process, etc., can solve the problems of turbidity of passivation solution, difficult to manufacture passivation agent, difficult operation and control of production process, etc., and achieves low production cost and high activity. Improved and stable effect

Inactive Publication Date: 2006-11-08
SUR PRECISION METAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when free oxalate exists in the passivation solution, it will form insoluble cobalt oxalate precipitates with cobalt ions, making the passivation solution turbid; this makes the manufacture of passivation agent extremely difficult, and the production process is difficult. Easy to operate and control

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0010] In a one-liter beaker, add 500 ml of deionized water, and add 20.4 g of chromium chloride (containing 4.0 Cr 3+ ), after completely dissolving, sequentially add 8.5g of NaNO 3 , 6.2g of malonic acid, 3.2g of acetic acid, 1.2g of phosphate, stirred for one hour. Then add 11.6g of cobalt sulfate, and after stirring for two hours, add 2.8g of ammonium bifluoride and 1.6g of silicate, and continue stirring for 30 minutes; then add deionized water to a volume of 1 liter, and then use sodium carbonate or nitric acid to adjust When the pH value of the chemical solution reaches 1.8, it is ready for use.

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PUM

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Abstract

The present invention discloses anticorrosive trivalent chromium blue-white zinc coating passivator and its preparation process. The anticorrosive trivalent chromium blue-white zinc coating passivator includes Cr3+ 1-5 g / L, NaNO3 1-20 g / L, malonic acid 1-10 g / L, cobalt sulfate 5-20 g / L, acetic acid 1-10 g / L, phosphate 1-6 g / L, ammonium bifluoride 1-5 g / L and silicate 0.2-5 g / L. The preparation process includes dissolving the said materials in pure water successively through stirring to obtain transparent passivator. The present invention has the advantages of being practical and good use effect.

Description

technical field [0001] The invention relates to a blue-white passivation treatment agent for galvanized iron and steel and a preparation method thereof. Background technique [0002] Steel parts are usually passivated after electro-galvanizing or hot-dip galvanizing to prevent white rust in a short time. Since the galvanized layer is prone to white rust in a humid environment, which seriously affects the appearance and service life, steel parts usually need passivation treatment after galvanizing. The traditional passivating agent contains carcinogenic hexavalent chromium, causing serious pollution to the environment, and is gradually being replaced by the environmentally friendly trivalent chromium passivating agent. The early trivalent chromium passivation agent was made of chromic acid (CrO 3 ) and reducing agent (such as potassium pyrosulfite) reacted, the formula disclosed in U.S. Patent No. 4,263,059 is as follows: 1.1% v / v trivalent chromium solution (by chromic aci...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/07C23C22/77
CPCC23C2222/10
Inventor 李树泉曾广亮谢金平
Owner SUR PRECISION METAL TECH