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01-07-2007 | Issue 14/2007

Journal of Materials Science 14/2007

Effect of AlN particles on the corrosion behavior of Al/AlNP composites

Journal:
Journal of Materials Science > Issue 14/2007
Authors:
ZhangSheng Liu, BianTao Wu, MingYuan Gu

Abstract

The corrosion behavior of Al/AlNP composites has been examined by using potentiodynamic polarization technique in 3.5wt% NaCl solution with the pH value of 5, 8.6, and 11.6 respectively. Electrochemical impedance spectra (EIS) measurements have also been carried out to assess the long-term effects of AlN particles. It has been found that Al/AlNp composites show the increased susceptibility to pitting attack compared with the unreinforced Al, which is attributed to the micro-galvanic action between AlN particles and the matrix Al. The micro-galvanic action mainly arises as a result of hydrolysis of AlN particles. In addition, EIS measurements reveal that the corrosion mechanism of Al/AlNp composites changes a lot with increasing immersion time, which is controlled by diffusion process at last.

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