Al-Zn-Si合金涂层的制备及其耐蚀性能  

Preparation of Al-Zn-Si Alloy Coating by Sintering at Elevated Temperature and Evaluation of Its Corrosion Resistance

作　　者：蒋穹[1] 缪强[1] 丁祥[2] 魏小昕 

机构地区：[1]南京航空航天大学材料科学与技术学院,江苏南京211100 [2]南京依维柯汽车有限公司车桥分公司,江苏南京210028 [3]江苏省麟龙新材料股份有限公司,江苏无锡214183

出　　处：《材料保护》2012年第8期51-54,72-73,共4页Materials Protection

基　　金：江苏省科技支撑项目(BE2010021);江苏省科技成果转化专项基金项目(BA2011029);江苏省产学研联合创新资金--前瞻性联合研究项目(BY2011101)

摘　　要：采用富铝合金涂料制备防腐蚀涂层,以往未见研究报道。采用55%Al-Zn-Si合金粉末热烧结制备涂层,并与质量比为4∶1的Zn-Al混合粉末和单一锌粉制备的涂层进行比较:通过电化学和中性盐雾试验研究了其耐蚀性能,采用扫描电子显微镜(SEM)和X射线衍射仪(XRD)观察了Al-Zn-Si合金涂层的腐蚀形貌,研究了腐蚀产物的相组成。结果表明,Al-Zn-Si合金涂层也具有阴极保护作用,且其腐蚀电流密度较单一锌粉和Zn-Al混合粉末制备的涂层要小,其耐盐雾腐蚀性能优于其他2种涂层。The powder of 55%Al-Zn-1.6%Si was prepared into Al-Zn-Si alloy coating by sintering at elevated temperature.Zn-Al mixed powder(mass ratio 4∶1) and Zn powder were also prepared into relevant coatings for comparative studies in the same manner.The corrosion resistance of as-prepared coatings was evaluated with an electrochemical test rig and a neutral salt-spray test rig.The morphology of corroded coating surfaces and phase composition of corroded products were analyzed by scanning electron microscopy and X-ray diffraction,respectively.Results show that as-prepared Al-Zn-Si alloy coating is able to protect the cathode,and its corrosion potential is smaller than that of Zn coating and Zn-Al coating.Besides,as-prepared Al-Zn-Si alloy coating has better salt-spray corrosion resistance than that of Zn coating and Zn-Al coating.

关 键 词：Al-Zn-Si合金涂层 中性盐雾 耐蚀性 电化学性能 

分 类 号：TG174.44[金属学及工艺—金属表面处理]