Influence of oxidant KMnO<sub>4</sub> on film-forming process of rare earth metal conversion coating on LY12 aluminum alloy

Tianzhu Gao; Jiuqing Li

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Volume 9 Issue 3

Jun. 2002

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Abstract

International Journal of Minerals, Metallurgy and Materials > 2002 > 9(3): 216-220.

Tianzhu Gao, and Jiuqing Li, Influence of oxidant KMnO₄ on film-forming process of rare earth metal conversion coating on LY12 aluminum alloy, J. Univ. Sci. Technol. Beijing , 9(2002), No. 3, pp.216-220.

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Materials

Influence of oxidant KMnO₄ on film-forming process of rare earth metal conversion coating on LY12 aluminum alloy

Tianzhu Gao and
Jiuqing Li^,

Author Affilications

Materials Science and Engineering School, University of Science and Technology Beijing, Beijing 100083, China

Funds:

This work was financially supported by the National Natural Science Fund of China (No.59771067).

Received: 28 December 2001; Available Online: 15 June 2021

Graphical Abstract

Abstract

Abstract

A Cu/Al galvanic couple was established to study the influence of the oxidant KMnO₄ on the film-forming process of rare earth metal (REM) conversion coating on LY12 aluminum alloy. It is found that the galvanic couple simulative experiment accords with the actual immersion, and it can be substantially used to simulate the behavior of LY12 aluminum alloy in the film-forming process. It is showed that the formation of the coating is quickened in CeCl₃ solution containing KMnO₄ compared with that not containing KMnO₄. XPS results reveal that the coating formed on cathode is composed of oxide or hydroxide of Ce and Mn, so the mechanism of formation of REM conversion coating changes when KMnO4 is added.