Aquo-chromium-free surface treatment liquid for galvanized steel plate

A surface treatment liquid and treatment liquid technology, applied in the direction of metal material coating process, etc., can solve the problems of decreased salt spray resistance, easy failure, mutagenesis, etc., and achieve the effect of improving stability

Active Publication Date: 2013-02-27
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Galvanizing is an effective method to improve the atmospheric corrosion resistance of steel, but in a humid environment, the galvanized layer is prone to corrosion and must be pretreated
At present, the most widely used is chromate passivation treatment, but the passivation film formed after chromate treatment contains hexavalent chromium ions, and hexavalent chromium is easily absorbed by the human body, and has mutagenic and carcinogenic effects
[0004] At present, the water-based chromium-free treatment solutions mainly include molybdate, tungstate, rare earth metal salt, acrylic resin and organosilane system, among which the organosilane system has the best corrosion resistance, which is equivalent to chromate, but there are also defects. , the existing silane system treatment liquid has poor stability, is prone to failure after being placed, and the salt spray resistance performance is significantly reduced; and the coating process is demanding, the curing time is long, and the curing temperature is relatively high, which is not suitable for industrial production.

Method used

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  • Aquo-chromium-free surface treatment liquid for galvanized steel plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The composition of the metal surface treatment liquid is as follows:

[0026] Bistriethanolamine diisopropyl titanate: 5g / L

[0027] Mixed silane (n Methyltriacetoxysilane :n γ-Aminopropyltriethoxysilane =1:3): 100 g / L

[0028] Ce(NO 3 ).6H 2 O: 1.5 5g / L

[0029] Deionized water: balance

Embodiment 2

[0031] The composition of the metal surface treatment liquid is as follows:

[0032] Bistriethanolamine diisopropyl titanate: 25g / L

[0033] Mixed silane (n Methyltriacetoxysilane :n γ-Aminopropyltriethoxysilane =1:3): 100 g / L

[0034] Ce(NO 3 ).6H 2 O: 1.55g / L

[0035] Deionized water: balance

Embodiment 3

[0037] The composition of the metal surface treatment liquid is as follows:

[0038] Bistriethanolamine diisopropyl titanate: 50g / L

[0039] Mixed silane (n Methyltriacetoxysilane :n γ-Aminopropyltriethoxysilane =1:3): 100 g / L

[0040] Ce(NO 3 ).6H 2 O: 1.55g / L

[0041] Deionized water: balance

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Abstract

The invention relates to an aquo-chromium-free surface treatment liquid for a galvanized steel plate. The treatment liquid is characterized by comprising A) ethanolamine titanate, B) a mixed silane coupling agent, C) Zr<2+>, Ce<3+>, Mo<6+>, divalent or high-valence metal ions and D) deionized water. A usage method of the surface treatment liquid is as below: roller coating, dip coating, spraying coating or scraping coating is employed to fully immerse the treatment liquid with the galvanized plate; and the galvanized plate is cured at 60-80 DEG C for 10-20 S by a drying device.

Description

Technical field [0001] The invention belongs to the technical field of surface treatment of metal materials, and is an aqueous chromium-free surface treatment solution for galvanized series steel sheets; in particular, it relates to an aqueous chromium-free surface treatment solution that can effectively improve the corrosion resistance of galvanized series steel sheets. The treatment liquid does not contain toxic chromium ions and is an environmentally friendly product. [0002] Background technique [0003] Galvanizing is an effective method to improve the resistance of steel to atmospheric corrosion, but in a humid environment, the galvanized layer is prone to corrosion and must be pretreated. At present, the most widely used chromate passivation treatment, but the passivation film formed after chromate treatment contains hexavalent chromium ions, and hexavalent chromium is easily absorbed by the human body and has mutagenic and carcinogenic effects . [0004] At present, wat...

Claims

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Application Information

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IPC IPC(8): C23C22/68
Inventor 叶学海刘红光张春丽张晓波傅春明于晓微
Owner CHINA NAT OFFSHORE OIL CORP
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