In-situ preparation method of layered dihydroxy metal oxide film on surface of Al-Cu-Li alloy

Abstract

The invention discloses an in-situ preparation method of a layered dihydroxy metal oxide film on the surface of an Al-Cu-Li alloy. The preparation method comprises the following steps: a, pretreating,specifically, the surface of the Al-Cu-Li alloy is pretreated by polishing, alkali etching and acid washing to the pretreated Al-Cu-Li alloy; b, preparing a lithium carbonate solution with the concentration of 0.05-0.15M and the pH of 11.5-13.0; AND c, putting the pretreated Al-Cu-Li alloy obtained in the step a into the lithium carbonate solution in the step b, heating at a constant temperaturefor 10-60min under an atmospheric environment and a temperature of 25-70 DEG C, taking out the treated Al-Cu-Li alloy, rinsing with deionized water, drying and growing the on the surface of the Al-Cu-Li alloy in situ to obtain the layered dihydroxy metal oxide film. The uniform and compact LDH film can be prepared on the surface of the Al-Cu-Li alloy in situ, the corrosion resistance of the alloyis remarkably improved, the reaction condition is mild, and the method is suitable for industrial production.

Description

Technical field [0001] The invention belongs to a metal surface protection treatment technology, and specifically relates to an in-situ preparation method of a layered double hydroxy metal oxide film on the surface of an Al-Cu-Li alloy. Background technique [0002] The third-generation Al-Cu-Li alloy has excellent comprehensive properties such as low density, high specific strength and high specific rigidity. It is used to replace traditional 2xxx and 7xxx alloys in the aerospace field to reduce the weight of aircraft and improve its fuel efficiency. Because the Li element is extremely active, the corrosion potential difference between the Li-containing phase and the non-Li phase in the alloy and the Al matrix is ​​large, which causes the Al-Cu-Li alloy to be prone to local corrosion. Therefore, the Al-Cu-Li alloy is usually Need to go through a certain surface treatment to improve its corrosion resistance. In the aviation field, the commonly used aluminum alloy surface treatme...

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Problems solved by technology

Although domestic and foreign scholars have used different methods to prepare LDH films on the surface of different aluminum alloys, and achieved remarkable corrosion resistance effects, most of the LDH film preparation processes have problems such as long preparation time, high temperature, and poor process efficiency. Harsh and other issues can not meet the needs of industrial production

In addition, the current research on the preparation of LDH on the surface of aluminum alloys mainly focuses on traditional aluminum alloys such as 2xxx and 7xxx, and there is no report on the rapid and in-situ preparation of LDH films based on Al-Cu-Li alloys.

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