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

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0031] Example 1

[0032] Put 12.5g vinyltriethoxysilane and 6.0g γ-methacryloxypropyltrimethoxysilane in a 1000mL three-necked flask equipped with a temperature controller, stirrer and addition funnel, and then add 650g isopropyl After heating the alcohol to 50°C and turning on the stirrer, 90 g of an aqueous solution containing 5.0 g of manganese sulfate and 4.5 g of vanadyl sulfate was slowly dropped into the solution. The pH was adjusted to 3.6 with 5 wt% orthophosphoric acid.

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

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

[0035] Sodium phosphate 20g / L Sodium dodecylbenzene sulfonate 2g / L

[0036] The rest is water.

[0037] Temperature 70℃, time 5~10min.

[0038] The use of alkaline etching process of aluminum alloy plate is as follows:

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

[0040] The degreasing and alkaline etching processes are the same as in Example 1. The 6061-T6 aluminum pl...

Example Embodiment

[0042] Example 2

[0043] The difference from Example 1 is that

[0044] Put 20.6g γ-glycidoxypropyltriethoxysilane, 5.2g propyltriethoxysilane, 2.5g dodecyltrimethoxysilane in 1000mL equipped with temperature controller, stirrer and feeding Then add 300g isopropanol and 200g propylene glycol monomethyl ether into a three-necked flask with a funnel. After heating to 60°C and turning on the stirrer, 37.7g of an aqueous solution containing 2.8g of cobalt nitrate and 5.3g of cerium ammonium nitrate is slowly dropped into it, with a content of 36wt% Acetic acid adjusts the pH to 3.8, keeps it for 2h, takes it out and cools to room temperature.

[0045] The 5083-H131 aluminum plate after degreasing and alkali etching is immersed in the above-mentioned chromium-free chemical conversion solution for 10-30 seconds, and then placed in an oven at 200° C. for curing for 30 minutes.

[0046] In this embodiment, the thickness of the obtained chromium-free chemical conversion coating is about 1 μm...

Example Embodiment

[0047] Example 3

[0048] The difference from Example 1 is that

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

[0050] The 5086-H116 aluminum plate after degreasing and alkali etching is immersed in the above-mentioned chromium-free chemical conversion solution for 10-30 seconds, and then placed in an oven at 250°C for curing for 10 minutes.

[0051] In this embodiment, the thickness of the obtained chromium-free chemical conversion coating is about 1 μm, and the neutral s...

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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

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Claims

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Application Information

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Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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