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Abstract AES and EPMA have been used to study the passive film and the pit sidewall of Fe-Cr alloys which contain 13%,17% and 28%Cr in 3.5%NaCl solution.By Ar~+ sputtering,the Cr/Fe ratio versus the thickness of the passive film is obtained,and the behavior of Cr in the film has beeninves- tigated.Experiments and analyses show that the Cr/Fe ratio both in the surface passive film and in the pit sidewall of Fe-Cr alloys are markedly higher than that of base materials.The most important factor withregard to protective ability of the passive film is the Cr/Fe ratio in thefilm.The higher the Cr/Fe ratio,the better the protective ability of thefilm is.
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Received: 25 August 1985
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[1] Castle,J.E.,Clayton,C.R.,Corr.Sci.,17,7(1977)
[2] Barnes,G.J.,Alday,A.W.,Jerner,R.C.,J.Eletrochem,Soc.,119,684(1972)
[3] Hultquist,G.,Leygraf,C.,Corrosion,36,12,(1980)
[4] Palmbery,P.W.,Analytical chemistry.,45,549(1973)
[5] 林荣富等,金属学报,18,586(1982)
[6] Asami,K.,Corr.Sci.,16,909(1976)
[7] 李方,北京钢铁学院硕士研究生论文,(1984) |
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