CORROSION PERFORMANCE AND PASSIVE FILM OF AN AUSTENITIC Fe-Mn-Al ALLOY

J Chin Soc Corr Pro

1996, Vol. 16

Issue (4): 275-280 DOI:

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CORROSION PERFORMANCE AND PASSIVE FILM OF AN AUSTENITIC Fe-Mn-Al ALLOY

ZHU Xuemei; ZHONG Shuhai; ZHANG Yansheng (Dalian Railway Institute)

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Abstract The corrosion properties of the austenitic Fe-30.8Mn-8.2Al alloy in a series of aqueous solutions at PH -0.8 to 15.3 and the corrosion protection mechanism induced by adding Al were studied by anodic polarization technique and by AES/ XPS analysis. The corrosion behaviour of the alloy was compared with that of Fe-30Mn alloy, mild steel, cryogenic 9% Ni steel and 1Cr13 stainless steel. The addition of 30 Wt% Mn into mild steel was very detrimental to its corrosion resistance in aqueous solution. The Fe-30Mn alloy only showed passivation behaviour in NaOH solution while the anodic polarization curves of Fe-30.8Mn-8.2Al alloy exhibited a stable passiwtion region in 1M Na2SO4, 10～50% HNO3 and 10～50%NaOH solutions, but in 10% HCI and 3.5% NaCI solutions, no passivation was observed. The corrosion resistance of Fe-30.8Mn-8.2Al alloy in these aqueous solutions was comparable to that of cryogenic 9% Ni steel but inferior to that of 1Cr13 stainless steel. According to AES/XPS analyses, the outermost surfae layer and the main part of the passive film formed on the Fe-30.8Mn-Al alloy in 1M Na2SO4 solution probably consisted of the hydroxide and a capture of iron, manganess and aluminium oxides.

Key words: Fe-Mn-Al alloy Aqueous solution corrosion Passive film

Received: 25 August 1996

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ZHU Xuemei; ZHONG Shuhai; ZHANG Yansheng (Dalian Railway Institute). CORROSION PERFORMANCE AND PASSIVE FILM OF AN AUSTENITIC Fe-Mn-Al ALLOY. J Chin Soc Corr Pro, 1996, 16(4): 275-280.

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y1996/V16/I4/275

1WangR,etal．Met．Prog,1983,123:722WangR,etal．Proceedingsof9thICMC,Toronto1984;June,4:5453AltstetterCJ．etal．Mater．Sci．Eng．198682:134WenT,etal．J．Matter．Sci,1987,22:35175ShihST,etal．Corrosion;1993,49:1306张彦生·金属学报,1984,20:3137曹楚南·中国腐蚀与防护学报,1985;5:1558张彦生等·金属学报,1965;8:352

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