AN INVESTIGATION ON RESISTANCE OF A NITRIDED STAINLESS STEEL TO STRESS CORROSION CRACKING IN BOILING 42％ MgCl_2 SOLUTION

J Chin Soc Corr Pro

1988, Vol. 8

Issue (4): 313-317 DOI:

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AN INVESTIGATION ON RESISTANCE OF A NITRIDED STAINLESS STEEL TO STRESS CORROSION CRACKING IN BOILING 42％ MgCl_2 SOLUTION

I'ang Yisan and Wei Qimou (Wuhan Research Institute of Material Protection)

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Abstract An investigation on SCC behavior of 1Cr18Ni9Ti austenitic stainless steel and its ion-nitrided samples has been carried out by constant loading tensile test, electrochemical method and acoustic emission technique. The result shows that the ion-nitriding process is an effective measure for improving the SCC resistance in chloride medium. Local nitriding on stainless steel can also postpone the initiation of SCC. A new explanation on mechanism of improving SCC resistance of stainless steel by nitriding is described in this paper. It is suggested that the main cause for improved SCC resistance stainless steel is the shift of corrosion potential below the critical cracking potential (just after the establishment of galvanic couple) rather than the compressive stress induced on the surface layer by nitriding.

Received: 25 August 1988

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I'ang Yisan and Wei Qimou (Wuhan Research Institute of Material Protection). AN INVESTIGATION ON RESISTANCE OF A NITRIDED STAINLESS STEEL TO STRESS CORROSION CRACKING IN BOILING 42％ MgCl_2 SOLUTION. J Chin Soc Corr Pro, 1988, 8(4): 313-317.

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y1988/V8/I4/313

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