Low-chromium type zinc-chromium coating

A coating, zinc-chromium technology, applied in the direction of anti-corrosion coatings, etc., can solve the problems of environmental hazards of coatings, restrictions on chromium salts, and large usage of chromium salts as inorganic binders and passivators, etc., to achieve high corrosion resistance, Good for wide application and good for environmental protection

Inactive Publication Date: 2004-09-15
昆明达克罗科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] But, in a strict sense, zinc-chromium coating is not a complete environmental protection product, and this is because the use amount of chromium salt as inorganic binder and passivating agent is adopted in the zinc-chromium coating, as disclosed in CN1323860A Zinc chrome paint contains Cr 6+ Up to 15-22%
Although most of the chromium in the paint participates in the reaction to form a zinc coating during the curing and sintering process, there is still a small amount of chromium in the form of Cr 6+ The form remains in the zinc-chromium coating, and the remaining Cr 6+ Hazardous to coating environment due to water solubility
Cr 6+ Highly toxic and carcinogenic, the use of chromium salts has been increasingly restricted

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] A coating that can be directly coated on iron-based (including powder metallurgy) surfaces. It is made by mixing components A, B, and C. Components A:B=40:60. If spraying is used, C is A+B. 0.2%, such as brush C is 0.3% of A+B. Component A is composed of flake zinc (thickness 0.1-0.5μm, sheet diameter 5-50μm), flake aluminum (thickness 0.1-0.3μm, sheet diameter 5-50μm) and organic matter, of which flake zinc accounts for the component 55% of A, flake aluminum accounts for 5% of component A, dihydroxydiethyl ether accounts for 15% of component A, and alkylphenol polyoxyethyl ether accounts for 25% of component A. Component B is composed of a mixed aqueous solution of chromium salt and hydrogen phosphate, wherein chromic acid accounts for 2% of component B, sodium dichromate accounts for 3% of component B, sodium dihydrogen phosphate accounts for 10% of component B, Sodium monohydrogen phosphate accounts for 8% of component B, and the balance is distilled water or deioni...

Embodiment 2

[0013] A paint that can be directly coated on the surface of aluminum base (including powder metallurgy), which is made by mixing components A, B, and C. Components A: B = 35: 65. For example, if spraying C is 0.2 of A + B %, if brushing C is 0.3% of A+B, component A is composed of flake zinc, flake aluminum and organic matter, of which flake zinc accounts for 50% of component A, flake aluminum accounts for component 10% of A, dihydroxydiethyl ether accounts for 20% of component A, and alkylphenol polyoxyethyl ether accounts for 20% of component A. Component B is composed of a mixed aqueous solution of chromium salt and hydrogen phosphate, wherein chromic acid accounts for 2% of component B, potassium dichromate accounts for 2.5% of component B, potassium dihydrogen phosphate accounts for 10% of component B, Potassium monohydrogen phosphate accounts for 12% of component B, and the balance is distilled water or deionized water. Component C is hydroxycellulose. Mix components ...

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Abstract

The invention refers to a kind of low chrome type zinc-chrome paint, the paint is made up of three substances of A, B, C, A: B=35-45:65:55, C accounts for 0.2%-0.4% of A plus B, Cr6+ is less than 2% in paint. A is the compound of slice zinc, slice aluminium, dicarboxylic diethyl ether and alkyl radical phenol polyethylene ethyl ether. The ingredient B is made up of mixed water liquid of chrome salt and hydrogen phosphate salt, C is carboxy cellulose. The invention uses chrome salt and hydrogen phosphate salt as the double inorganic adhesives and passivant, it uses hydrogen phosphate salt to replace part of chrome salt, thus it reduces the chrome quantity of the paint. The paint has a high rot-proof performance, the chrome in paint can be decreased to microcontent, it has advantage to the environment protection.

Description

1. Technical field [0001] The invention relates to a metal anticorrosion coating, in particular to a low-chromium zinc-chromium coating which is favorable for environmental protection. 2. Background technology [0002] Traditional metal anti-corrosion treatment usually adopts electro-galvanizing and hot-dip galvanizing processes, but their corrosion resistance is often not ideal, and both electro-galvanizing and hot-dip galvanizing pollute the environment. At present, zinc-chromium coatings that are popular at home and abroad have been widely used in metal anti-corrosion treatment processes due to their high corrosion resistance, no hydrogen embrittlement, thin coatings, and no three wastes discharged during the coating process, and basically do not pollute the environment. [0003] But, in a strict sense, zinc-chromium coating is not a complete environmental protection product, and this is because the use amount of chromium salt as inorganic binder and passivating agent is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D5/08
Inventor 刘鸿康贺子凯王敏王志英王家禄黄鑫
Owner 昆明达克罗科技有限责任公司
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