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Chromium-free rare-earth environment-friendly chemical conversion treatment method of die casting aluminium alloy part

A technology of chemical conversion treatment and casting aluminum alloy, which is applied in the direction of metal material coating process, etc., can solve the problems of poor corrosion resistance and anticorrosion effect not as good as profile aluminum alloy, and achieve the effect of improving salt spray resistance and corrosion resistance

Inactive Publication Date: 2011-10-12
UNIV OF SCI & TECH BEIJING +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the high silicon characteristics of die-casting aluminum-silicon alloys, it has poor corrosion resistance, and the anti-corrosion effect after chemical conversion treatment is not as good as that of profile aluminum alloys, and the current patents for chemical conversion treatment of aluminum alloys are mainly for the anti-corrosion of profile aluminum alloys, and some are used as paint coatings bottom membrane

Method used

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  • Chromium-free rare-earth environment-friendly chemical conversion treatment method of die casting aluminium alloy part
  • Chromium-free rare-earth environment-friendly chemical conversion treatment method of die casting aluminium alloy part
  • Chromium-free rare-earth environment-friendly chemical conversion treatment method of die casting aluminium alloy part

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Configure chemical conversion solution component A: cerium nitrate 10g / L, surfactant stearic acid 2g / L, activator potassium fluoride 4g / L; component B: potassium permanganate 5g / L, phosphoric acid 4g / L; When in use, prepare the two-component solutions of A and B at a volume ratio of 1:1, soak the pretreated die-casting aluminum alloy parts in the chemical conversion solution, convert them at 80°C for 6 minutes, and then deionized water Clean the parts, place them in deionized water at 90°C for 10 minutes, and finally dry them. The neutral salt spray resistance time of the chemical conversion coating obtained by testing the die-casting aluminum alloy parts is 2 hours.

Embodiment 2

[0035] Configuration chemical conversion solution component A: cerium nitrate 10g / L, surfactant lauric acid 2g / L, activator sodium fluoride 4g / L; component B: hydrogen peroxide 5g / L, tannic acid 4g / L; , the two-component solution of A and B is prepared at a volume ratio of 1:1, and the pretreated die-casting aluminum alloy parts are soaked in the chemical conversion solution, converted at 80 ° C for 6 minutes, and then cleaned with deionized water. The parts were sealed in deionized water at 90°C for 10 minutes, and finally dried. The neutral salt spray resistance time of the chemical conversion coating obtained by testing the die-casting aluminum alloy parts is 5 hours.

Embodiment 3

[0037] Configuration chemical conversion solution component A: cerium chloride 10g / L, surfactant sodium dodecylbenzenesulfonate 2g / L, activator potassium fluoride 2g / L; component B: potassium chlorate 1g / L, chloride Strontium 1g / L; when in use, prepare A and B two-component solutions with a volume ratio of 1:1, soak the pretreated die-casting aluminum alloy parts in the chemical conversion solution, and convert them at 60°C for 5 minutes , and then wash the parts with deionized water, put them in deionized water at 90°C for 5 minutes, and finally dry them. The neutral salt spray resistance time of the chemical conversion coating obtained by testing the die-casting aluminum alloy parts is 8 hours.

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Abstract

The invention relates to a chromium-free environment-friendly chemical conversion treatment process of a die casting aluminium alloy part, comprising the steps of: surface sand-blasting treatment of the die casting aluminium alloy part, surface pre-treatment of the die casting aluminium alloy part, preparation of a chromium-free environment-friendly conversion solution, chemical conversion treatment, and sealing treatment after the chemical conversion treatment. One composition of a chemical conversion coating layer is oxide of tetravalent cerium. The chemical conversion coating layer is uniform and tawny with the thickness about 2 mum. The chemical conversion coating layer prepared with the method has an excellent corrosion resisting property, is on a par with a trivalent chromium chemical conversion coating, and has high binding strength with a matrix. Products or discharges after the chemical conversion treatment do not contain hexavalent chromium, which is harmful to the environment and human health.

Description

technical field [0001] The invention relates to a surface chemical conversion treatment method of die-casting aluminum alloy parts, in particular to a chromium-free and environmentally friendly chemical conversion treatment process on the surface of die-casting aluminum-silicon alloy parts, which can obtain a uniform thickness and dense yellow-brown color-free surface on the surface of die-casting aluminum-silicon alloy parts. Chromium protective film layer, which can be used as the bare film of die-casting aluminum-silicon alloy parts, instead of the traditional chemical conversion treatment of hexavalent chromium and trivalent chromium. Background technique [0002] The development of the automobile industry and the increase in the number of automobiles have not only promoted the development of my country's manufacturing industry and brought convenience to people's lives, but also produced three major problems of fuel consumption, emissions and safety; lightweight is an imp...

Claims

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Application Information

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IPC IPC(8): C23C22/34C23C22/36
Inventor 庞晓露朱政高克玮王化平陶保健
Owner UNIV OF SCI & TECH BEIJING
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