本文研究了Zn-Al15涂层在海水腐蚀后的形貌、组织结构、化学成分及电化学特性。结果表明,Zn-Al15涂层片状共晶组织的选择性溶解是其电化学静特性与Zn涂层相似、动特性与Al涂层相似的根本原因。海水腐蚀初期,涂层的片状共晶组织与残余应力共同作用,引起涂层的应力腐蚀开裂,导致缝隙腐蚀。随后涂层的脆化、腐蚀产物的塞积、膨胀及残余应力等共同作用,使涂层鼓泡,导致涂层局部腐蚀失效。
The morphology, microstructure,chemical composition and electrochemicalfeature of the flame sprayed Zn-Al15 coating after corrosion test in sea water havebeen investigated. The results show that the selective dissolution of the laminar eu-tectic structure of the Zn-Al15 coating is the fundamental cause for the similarityof the electrochemical static feature to that of the Zn coating and of the kineticfeature to that of Al coating. The combined action of the laminar eutectic structure ofthe coating together with residual stress in the beginning under sea water corrosionmay induce the stress corrosion cracking of the coating, and result the interstitialcorrosion. Then, the coating will bulge and fail in localities due to embrittlementitself, stacking and expansion of corroded products under the residual stress.
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