In situ preparation method of layered double hydroxy metal oxide film on the surface of al-cu-li alloy

Abstract

The invention discloses an in-situ preparation method of a layered double hydroxyl metal oxide film on the surface of an Al-Cu-Li alloy. , pickling process obtains pretreatment Al-Cu-Li alloy; b, preparation concentration is 0.05~0.15M, the lithium carbonate solution that pH is 11.5~13.0; c, the pretreatment Al-Cu-Li alloy that step a obtains is put into the lithium carbonate solution in step b, and heated at a constant temperature for 10 to 60 min under the condition of 25 to 70° C. in an atmospheric environment, take out the processed Al Cu Li alloy and wash it with deionized water, dry it, and place it on the Al Cu Li alloy. In situ growth on the surface of ‑Cu‑Li alloy to obtain layered double hydroxyl metal oxide films. It can in-situ prepare a uniform and dense LDH film on the surface of Al-Cu-Li alloy, significantly improve the corrosion resistance of the alloy, and the reaction conditions are mild, which is suitable for industrial production.

Description

technical field [0001] The invention belongs to metal surface protection treatment technology, and in particular relates to an in-situ preparation method of a layered double hydroxyl 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 specific stiffness, and is used in the aerospace field to replace traditional 2xxx and 7xxx alloys to reduce the weight of aircraft and improve its fuel efficiency. Due to the extremely active Li element, the corrosion potential difference between the Li-containing phase and the non-Li-containing phase in the alloy and the Al matrix is ​​large, which makes the Al-Cu-Li alloy prone to localized corrosion. Therefore, the Al-Cu-Li alloy is usually used before it is used. Certain surface treatment is required to improve its corrosion resistance. In the aviation field, the commonly used surface t...

AI Technical Summary

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.

Images