Electrochemical Characteristics of the Rare Earth Compound Coating on 6061 Aluminum Alloy

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The composite coatings were prepared on aluminum alloy by anodizing and chemical conversion method. The coatings consisted of a anodic oxide coating and a rare earth conversion coating. The surface morphology and composition of the composite coatings were analyzed by scanning electron microscopy (SEM) and energy dispersive X-rays (EDX). The electrochemical properties of the different samples were researched by Potentiodynamic polarisation and electrochemical impedance spectroscopy in a 3.5-wt.% NaCl solution. The results showed that corrosion current density of the sample with composite coatings was 3.611×10-9 A·cm-2, impedance was 6.107×105 Ω·cm-2. The composite coatings had better corrosion resistance than the sample with anodic oxide film and the aluminum alloy substrate.

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Periodical:

Edited by:

Dongye Sun, Wen-Pei Sung and Ran Chen

Pages:

2361-2365

DOI:

10.4028/www.scientific.net/AMM.71-78.2361

Citation:

Y. Q. Wen et al., "Electrochemical Characteristics of the Rare Earth Compound Coating on 6061 Aluminum Alloy", Applied Mechanics and Materials, Vols. 71-78, pp. 2361-2365, 2011

Online since:

July 2011

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$38.00

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