A STUDY ON SURFACE PASSIVE FILM ON STAINLESS STEEL OCr18Ni15Mo4 IN DILUTE SULPHURIC ACID SOLUTIONS

J Chin Soc Corr Pro

1997, Vol. 17

Issue (3): 210-214 DOI:

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A STUDY ON SURFACE PASSIVE FILM ON STAINLESS STEEL OCr18Ni15Mo4 IN DILUTE SULPHURIC ACID SOLUTIONS

LIU Xiaodong LIU Huan'an WU Weitao(State Key Laboratory for Corrosion and Protection; Institute of Corrosion and Protection of Metals; Chinese Academy of Sciences; Shenyang 110015)

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Abstract

By means of AES and XPS surface analyses, the alloying element distribution, composition and structure of surface passive film of stainless steel OCrl8Nil5Mo4 were investigated in 20%H2SO4 solution and 20%H2SO4+35g/L Cu2+, which simulated the solution in wet process of copper extraction. The results showed that the passive films possessed duplex structure consisting of an outer hydroxide and an inner oxide. The passive film in reductive dilute sulphuric acid was found to be enriched with Mo (VI), N and Cr3+. The passivation effect of Mo in passive film might be reduced with the depolarization effect ' due to Cu2+ ions added.

Key words: H2SO4 solution Austenitic stainless steel Surface film

Received: 25 June 1997

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LIU Xiaodong LIU Huan'an WU Weitao(State Key Laboratory for Corrosion and Protection; Institute of Corrosion and Protection of Metals; Chinese Academy of Sciences; Shenyang 110015). A STUDY ON SURFACE PASSIVE FILM ON STAINLESS STEEL OCr18Ni15Mo4 IN DILUTE SULPHURIC ACID SOLUTIONS. J Chin Soc Corr Pro, 1997, 17(3): 210-214.

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y1997/V17/I3/210

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