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CORROSION FAILURE ANALYSIS OF FLAME SPRAYED Zn-Al15 COATING IN SEA WATER |
LIN Chengfu;WEN Lishi;QIAN Shengwei;KANG Datao Institute of Metal Research; Academia Sinica; Shenyang Yanshang University Institute of Metal Research;Academia Sinica;Shenyang 110015 |
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Cite this article:
LIN Chengfu;WEN Lishi;QIAN Shengwei;KANG Datao Institute of Metal Research; Academia Sinica; Shenyang Yanshang University Institute of Metal Research;Academia Sinica;Shenyang 110015. CORROSION FAILURE ANALYSIS OF FLAME SPRAYED Zn-Al15 COATING IN SEA WATER. Acta Metall Sin, 1990, 26(2): 116-119.
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Abstract 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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Received: 18 February 1990
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1 Nagasaka N等,见:全国热喷涂协作组编译,第10届国际热喷涂会议译文集,北京,1984:229 2 Suzuki R, Nagasaka H, Shibata T. In: Haruyama S ed, Proceedings of 10th World Congress Metal Finishing, Tokyo: The Metal Finishing Society of Japan, 1980: 459 3 Show B A, Moran P J. Mater Perform. 1985; 24 (11) : 22 4 林成福.燕山大学硕士论文,1989 |
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