EFFECT OF COLD WORKING ON PITTINGSUSCEPTIBILITY OF 304 STAINLESS STEEL

J Chin Soc Corr Pro

2002, Vol. 22

Issue (4): 198-201 DOI:

Research Report

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EFFECT OF COLD WORKING ON PITTINGSUSCEPTIBILITY OF 304 STAINLESS STEEL

Gang Hu;Chunchun Xv;Xinsheng Zhang

北京化工大学材料科学与工程学院

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Abstract Cold working induced martensite content on type 304 stainless steel equipment was examined on-site.With different modes and differe nt degree of cold working at room temperature,the martensite content was about 0 . 5%～10%.By potentiodynamic polarization,galvanostatic polarization and simulated occluded corrosion cell methods,the relationship between pitting potential(E b),pitting initiation potential(Enp),corrosion potential(E corr) and martensite content on 304 stainless steel which had been prepared by low temperature(70℃) tensile deformation was investigated in 3.5%NaCl solut ion.Experimental result showed that when the martensite content was between 0.1% (the material without low temperature tensile deformation) and 11.5%(the mate rial with 10% low temperature tensile deformation),with the increas ing of martensite content the potential of Eb,Enp and Ec orr changed negative(when then martensite content is 5%,the potentials were th e most negative),the pH value in occluded cell dropped and the current density i ncreased.It meant that cold working not only accelerated pitting initiation,but also accelerated pitting propagation of 304 stainless steel.

Key words: 304 stainless steel martensite pitting simulated occlu ded cell

Received: 29 June 2001

ZTFLH:

TG172.5

Corresponding Authors: Chunchun Xv E-mail: chunchunxu@163.com

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Gang Hu; Chunchun Xv; Xinsheng Zhang. EFFECT OF COLD WORKING ON PITTINGSUSCEPTIBILITY OF 304 STAINLESS STEEL. J Chin Soc Corr Pro, 2002, 22(4): 198-201 .

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y2002/V22/I4/198

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