AN INVESTIGATION OF CORROSION RESISTANCE AND SURFACE FILM OF A DUPLEX STAINLESS STEEL IN CHLORIDE-CONTAINING ALKALINE SOLUTION

J Chin Soc Corr Pro

1994, Vol. 14

Issue (3): 217-224 DOI:

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AN INVESTIGATION OF CORROSION RESISTANCE AND SURFACE FILM OF A DUPLEX STAINLESS STEEL IN CHLORIDE-CONTAINING ALKALINE SOLUTION

Xia Yanjie (Beijing Institute of Chemical Technology)Wu Jiu(Central Iron and Steel Research Institute) Yang Huiying(The 8th Design Institute of the Ministry of Chemical Industry)

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Abstract The electrochemical behavior of 00Cr18Ni5Mo3Si2 (18-5) duplex stainless steel in chloride-containing alkaline solution at 90 ℃ was investigated. The results showed that general and pitting corrosion resistance of the 18-5 steel was superior to that of OCr18NigTi (18-8Ti) austenitic stainless steel. In alkaline solution,NH3 (free), CO32- and HCO3- acted as corrosion inhibitors for 18-5 steel, while S2- activated the steel. The surface films were analysed by EDAX, XPS and electron diffraction, The results obtained are summarized as follows. The surface films on both the steels were complex multi-Valence chide films, consisting mainly of CrOOH and Cr2O3. The Cr-enrichment in the film on the 18-5 steel was more than that on the 18-8Ti steel. The surface film on the 18-5 steel was more compact and steady. MoO3 in film effectively enhanced the pitting corrosion resistance of the 18-5 steel.

Key words: Duplex stainless steel Chloride containing solution Surface film Electrochemical measurement

Received: 25 June 1994

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Xia Yanjie (Beijing Institute of Chemical Technology)Wu Jiu(Central Iron and Steel Research Institute) Yang Huiying(The 8th Design Institute of the Ministry of Chemical Industry). AN INVESTIGATION OF CORROSION RESISTANCE AND SURFACE FILM OF A DUPLEX STAINLESS STEEL IN CHLORIDE-CONTAINING ALKALINE SOLUTION. J Chin Soc Corr Pro, 1994, 14(3): 217-224.

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y1994/V14/I3/217

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