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对SiC_p表面化学镀镍后制备的铝基复合材料(SiC_p-Ni/Al)界面及耐蚀性差异进行研究。采用XRD,SEM及EDS观察SiC_p-Ni/Al与未镀镍SiC_p制备的Al基复合材料(SiC_p/Al)界面,通过极化曲线及电化学噪声测试其耐蚀性。结果表明,镀镍层改善了SiC_p与Al基体间的润湿性,提高了界面结合强度,减少了有害界面反应物A14C3的生成。SiC_p/Al在3.5%(质量分数)Na Cl溶液中浸泡2000 s前表现为局部腐蚀行为,之后转变为均匀腐蚀。而SiC_p-Ni/Al在整个浸泡过程表现为局部腐蚀,且其自腐蚀电位较高,噪声电阻较大,耐蚀性更好。
The interface and corrosion resistance of aluminum matrix composites (SiC_p-Ni / Al) prepared by electroless nickel plating on SiC_p surface were studied. The interface of Al-based SiC composites (SiCp / Al) prepared by SiCp-Ni / Al and uncoated SiCp was observed by XRD, SEM and EDS. The corrosion resistance was tested by polarization curves and electrochemical noise. The results show that nickel plating improves the wettability between SiCp and Al matrix, improves the interfacial bonding strength and reduces the formation of detrimental interfacial reaction A14C3. The SiC_p / Al showed local corrosion behavior before it was immersed in 3.5% NaCl solution for 2000 s, then transformed into uniform corrosion. However, SiC_p-Ni / Al showed partial corrosion during the whole immersion process, and its self-corrosion potential was higher, noise resistance was larger, and corrosion resistance was better.