SELECTIVE CORROSION DURING STRESS CORROSION CRACKING OF OOCr18Ni5Mo3Si DUPLEX STAINLESS STEEL

J Chin Soc Corr Pro

1998, Vol. 18

Issue (1): 47-51 DOI:

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SELECTIVE CORROSION DURING STRESS CORROSION CRACKING OF OOCr18Ni5Mo3Si DUPLEX STAINLESS STEEL

WANG Yong-guang MIN Guo-quan ZHENG Wen-long (Shanghai Research Intitute of Materials; Shanghai 200437)

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Abstract Stress corrosion cracking of duplex stainless steels may occur in H2S saturated aqueous solutions containing Cl-. In this study, metallographic microscopy, EPMA, and SEM were used to analyse the cracking behaviour of the duplex stainless steel 00Cr18Ni5Mo3Si in different solution. In solution (b) : saturated H2S+5%NaCl+0.5%CH3COOH, pH=3.0-4.5 and solution (c) : saturated H2S+5%NaCl+0.5%CH3COOH+ 0.01%Na2CO3, pH=4.3-4.6, selective corrosion of individual phasses was observed during stress corrosion cracking. The ferrite corroded while the austenite was not attacked. In solution (d): saturated H2S+0.5%NaCl+0.5%CH3COOH+HCl(pH≈1), on the contray, the austenite corroded and the ferrite was only slightly attacked. Perhaps the potential reversal of the austenite and the ferrite took place in the presence of HC1 in the H2S saturated solution.

Key words: Stress corrosion cracking Selective cracking Duplex stainless steel

Received: 25 February 1998

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WANG Yong-guang MIN Guo-quan ZHENG Wen-long (Shanghai Research Intitute of Materials; Shanghai 200437). SELECTIVE CORROSION DURING STRESS CORROSION CRACKING OF OOCr18Ni5Mo3Si DUPLEX STAINLESS STEEL. J Chin Soc Corr Pro, 1998, 18(1): 47-51.

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y1998/V18/I1/47

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