MECHANISM OF HF2- IONS IN Ce-Mn CONVERSION COATINGS ON Al ALLOY

J Chin Soc Corr Pro

2012, Vol. 32

Issue (1): 39-43 DOI:

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MECHANISM OF HF₂^- IONS IN Ce-Mn CONVERSION COATINGS ON Al ALLOY

LI Wenfang, ZHANG Kai, DU Jun

School of Materials Science and Engineering, South China University of Technology, Guangzhou 510641

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Abstract Distribution of Ce-Mn conversion coating was analysed with electron probe micro analysis,energy disperse spectroscopy, X-ray photoelectron spectroscopy analysis, respectively. X-ray diffraction was used to study the features of the phase composition of the conversion coating and the sediment in the solution containing HF₂^- ions. The results show that the element F does not exist in the Ce-Mn conversion coatings, and HF₂^- does not participate in the growth process of the coating. The main purpose of HF₂^- ions was in the initial stage. Al matrix and its oxide film (Al₂O₃) in the surface of Al alloy were dissolved priority, so that cathode district which conducive to the formation of the coating exposures rapidly to the solution. Simultaneously, the total [AlF₆]^3- in the solution is less than 1.8 mmol/L, completely dissolved.

Key words: HF₂^- ions Ce-Mn conversion coating [AlF₆]^3- sediment

Received: 09 August 2010

ZTFLH:

TG174.4

Corresponding Authors: LI Wenfang E-mail: mewfli@scut.edu.cn

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LI Wenfang, ZHANG Kai, DU Jun. MECHANISM OF HF₂^- IONS IN Ce-Mn CONVERSION COATINGS ON Al ALLOY. J Chin Soc Corr Pro, 2012, 32(1): 39-43.

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y2012/V32/I1/39

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