Effect of AlN particles on the corrosion behavior of Al/AlNP composites
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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.
KeywordsZeta Potential Polarization Curve Corrosion Behavior Immersion Time Potentiodynamic Polarization
The authors are grateful for the financial support from the National Natural Science Foundation of China under grant No.50271043.
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