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Influence of Electroless Nickel Plating of SiC Particles on Interface Character and Corrosion Resistance of SiCp/Al Composites |
Yang LIU,Xiaozhen HUA(),Jinhua HUANG,Xia CUI,Xianliang ZHOU,Yingwei YU |
School of Material Science and Engineering, Nanchang Hangkong University, Nanchang 330063, China |
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Abstract The interface character and corrosion resistance of SiCp/Al composites prepared with electroless nickel plated SiC particles were studied by means of XRD, SEM and EDS as well as polarization curve and electrochemical noise test. The results show that the nickel plating improves the wettability between SiC particles and aluminum matrix, increases the interface bonding strength and reduces the formation of Al4C3, the later is a detrimental product resulted by the interfacial reaction of SiC and the matrix. SiCp/Al composites made of non-modified SiC particles suffered from local corrosion during immersion in 3.5%NaCl solution for the first 2000 s, and then turn to uniform corrosion. However, SiCp/Al composites made of Ni-plated SiC particles suffered from local corrosion during the whole immersion test. In addition, the Ni-plated SiCp/Al composites exhibited much positive free corrosion potential and higher noise resistance, therefore, implying a better corrosion resistance.
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