CORROSION FAILURE ANALYSIS OF FLAME SPRAYED Zn-A115 COATING IN SEA WATER

Abstract

Abstract: The morphology,microstructure,chemical composition and electrochemical behavior of the flame sprayed Zn-Al15 coating after corrosion test in sea water have been investigated.The results show that the selective dissolution of the laminar euteetic structure of the Zn-AI15 coating is the fundamental cause for its similarity in electrochemical behavior with Zn coating and kinetic behavior with Al coating.In the beginning period of sea water corrosion,the com- bined action of the laminar eutectic structure of the coating together with the residual stress may induce the stress corrosion cracking of the coating,and result in the crevice corrosion. The coating then will bulge and.fail in local areas due to embrittlement itself,stacking and ex- pansion of corroded products under the residual stress.

Key words: flame sprayed coating, faiture analysis, corrosion, stress corrosion cracking

LIN Chengfu WEN Lishi QIAN Shengwei Institute of Metal Research,Academia Sinica,Shenyang,ChinaKANG Datao Yanshan University,Qinhuangdao,China LIN Chengfu,Institute of Metal Research,Academia Sinica,Shenyang 110015,China. CORROSION FAILURE ANALYSIS OF FLAME SPRAYED Zn-A115 COATING IN SEA WATER[J]. Acta Metallurgica Sinica (English Letters), 1990, 3(11): 326-329.

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CORROSION FAILURE ANALYSIS OF FLAME SPRAYED Zn-A115 COATING IN SEA WATER

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