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Environmentally-friendly corrosion-resistant chromium-free chemical conversion liquid and method for preparing chemical conversion film

A chemical conversion coating and chemical conversion technology, applied in the field of marine aluminum alloy surface treatment, can solve the problem of difficulty in meeting the requirements of corrosion resistance and coating adhesion at the same time, and achieve easy storage and transportation, good corrosion resistance, and good coating. The effect of layer adhesion

Inactive Publication Date: 2012-04-11
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The object of the present invention is to provide an environment-friendly corrosion-resistant chromium-free chemical conversion solution and its application in an environment-friendly corrosion-resistant chromium-free chemical conversion film that improves the adhesion of marine aluminum alloy coatings, so as to solve the problem of the existing environment-friendly chemical conversion solution. It is difficult for the treatment process to meet the requirements of corrosion resistance and coating adhesion at the same time

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Put 12.5g of vinyltriethoxysilane and 6.0g of γ-methacryloxypropyltrimethoxysilane into a 1000mL three-necked flask equipped with a temperature controller, a stirrer and an addition funnel, and then add 650g of isopropyl Alcohol, after heating to 50°C and turning on the stirrer, slowly drop into 90g of an aqueous solution containing 5.0g of manganese sulfate and 4.5g of vanadyl sulfate, adjust the pH value to 3.6 with 5wt% orthophosphoric acid, keep it warm for 3 hours, take it out and cool to room temperature.

[0033] The aluminum alloy plate degreasing process is as follows:

[0034] Sodium hydroxide 7g / L Sodium carbonate 35g / L

[0035] Sodium phosphate 20g / L Sodium dodecylbenzenesulfonate 2g / L

[0036] The rest is water.

[0037] The temperature is 70°C and the time is 5-10 minutes.

[0038] Alkali etching process of aluminum alloy plate is as follows:

[0039] Sodium hydroxide 15g / L, temperature 30~35℃, time 30s.

[0040] The following examples of degreasing a...

Embodiment 2

[0043] The difference from Example 1 is that

[0044] Put 20.6g of γ-glycidoxypropyltriethoxysilane, 5.2g of propyltriethoxysilane and 2.5g of dodecyltrimethoxysilane in 1000mL equipped with temperature controller, stirrer and feeding In the three-necked flask of the funnel, then add 300g of isopropanol and 200g of propylene glycol monomethyl ether, after heating to 60°C and turning on the stirrer, slowly drop in 37.7g of aqueous solution containing 2.8g of cobalt nitrate and 5.3g of cerium ammonium nitrate, at 36wt% Adjust the pH value to 3.8 with acetic acid, take it out after 2 hours of heat preservation, and cool to room temperature.

[0045] Immerse the 5083-H131 aluminum plate after degreasing and alkali etching treatment in the above-mentioned chromium-free chemical conversion solution for 10-30 seconds, take it out and put it in an oven at 200°C for 30 minutes to cure.

[0046] In this embodiment, the thickness of the obtained chromium-free chemical conversion film is...

Embodiment 3

[0048] The difference from Example 1 is that

[0049] Put 15.3g of N-(β-aminoethyl)-γ-aminopropyltrimethoxysilane, 6.5g of tetraethoxysilane, 3.8g of γ-mercaptopropyltriethoxysilane in 500mL equipped with a temperature controller, Add 150g of n-butanol and 20g of ethylene glycol monobutyl ether to a three-necked flask with a stirrer and an addition funnel, heat to 50°C and turn on the stirrer, then slowly drop in an aqueous solution containing 1.5g of manganese nitrate and 2.3g of cobalt acetylacetonate 17.8g, adjust the pH value to 4.0 with 20wt% malonic acid, keep it warm for 5h, take it out and cool to room temperature.

[0050] Immerse the 5086-H116 aluminum plate after degreasing and alkali etching treatment in the above-mentioned chromium-free chemical conversion solution for 10-30 seconds, take it out and put it in an oven at 250°C for 10 minutes to cure.

[0051] In this embodiment, the thickness of the obtained chromium-free chemical conversion film is about 1 μm, an...

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Abstract

The invention relates to the field of aluminum alloy surface treatment, in particular relates to an environmentally-friendly corrosion-resistant chromium-free chemical conversion liquid and an application thereof in an environmentally-friendly corrosion-resistant chromium-free chemical conversion film with aluminum alloy coating adhesion for ships, and solves the problems of incapability of meeting the requirements on corrosion resistance and coating adhesion in the current environmentally-friendly chemical conversion treating process. The prepared chemical conversion film has excellent corrosion resistance and coating adhesion, is convenient in construction and can be used for substituting for a traditional chromium-containing chemical conversion and phosphate treatment process. The environmentally-friendly corrosion-resistant chromium-free chemical conversion liquid mainly comprises the components of silane, corrosion inhibition components and a solvent. The chromium-free chemical conversion film construction modes comprise dipping, roller painting and spraying, and the curing modes comprise natural curing and heating curing. The environmentally-friendly corrosion-resistant chromium-free chemical conversion film in the invention has excellent corrosion resistance and coating adhesion, can be used for substituting for a traditional chromium-containing chemical conversion and phosphate treatment process, and is applicable to aluminum alloys for ships such as 5xxx and 6xxx series aluminum alloys.

Description

technical field [0001] The invention relates to the field of surface treatment of marine aluminum alloys, in particular to an environment-friendly corrosion-resistant chromium-free chemical conversion liquid and its application in an environment-friendly corrosion-resistant chromium-free chemical conversion film for improving the adhesion of marine aluminum alloy coatings (i.e. : The preparation method of chemical conversion film). The formed chemical conversion coating has good corrosion resistance and coating adhesion, and is easy to construct, and can be used to replace traditional chromium-containing chemical conversion and phosphating processes. Background technique [0002] Due to long-term work in harsh corrosive environments such as seawater and ocean atmosphere, the surface of marine aluminum alloy workpieces usually requires chemical conversion treatment to improve the corrosion resistance of the aluminum alloy substrate and the adhesion to the subsequent organic c...

Claims

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Application Information

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IPC IPC(8): C23C22/06C09D183/00C09D5/08
Inventor 管勇刘斌张君男严川伟
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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