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| A STUDY OF THE ROLE OF MOLYBDENUM IN 316 STAINLESS STEEL ON SCC RASISTANCE IN HIGH TEMPERATURE AND HIGH PRESSURE WATER WITH THE AID OF CEMS, AES & XPS |
| Yu Fanghya Chen Chuanming Zhou Fugen Hu Wenxiang(Shanghai Institute of Nuclear Research; Academia Sinica)Chen Junming(Shanghai Institute of Metallurgy; Academia Sinica) |
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Abstract The structure and chemical composition of the oxide film on 316 and 321 stainless steels corroded in high temperature and high pressure water, containing 2000 ppm Cl~- and 8 ppm dissolved oxygen, was studied by conversion electron Mossbauer spectroscopy(CEMS), AES and XPS before and after SCC. A correlation between the structure arid chemical composition of the oxide film and SCC resistance was established. Experimental results show that the alloying element Mo reacted with corrosive medium to form Fe_2(MoO_4)_3 phase. Mo in 316 alloy affected the composition and growth rate of iron oxides, decreased the dissolution rate of Cr at transpassive region and inhibited Cl~- in its penetration through the oxide film, playing therefore a role to prolong the incubation period of SCC. Results obtained showed that Mo-bearing 316 alloy has better SCC resistance than 321 alloy with different SCC fractographs. The role of Mo on SCC resistance was also discussed based oa alloy thermody namics.
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Received: 25 June 1985
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Cite this article:
Yu Fanghya Chen Chuanming Zhou Fugen Hu Wenxiang(Shanghai Institute of Nuclear Research; Academia Sinica)Chen Junming(Shanghai Institute of Metallurgy; Academia Sinica). A STUDY OF THE ROLE OF MOLYBDENUM IN 316 STAINLESS STEEL ON SCC RASISTANCE IN HIGH TEMPERATURE AND HIGH PRESSURE WATER WITH THE AID OF CEMS, AES & XPS. J Chin Soc Corr Pro, 1985, 5(3): 176-188.
URL:
https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y1985/V5/I3/176
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