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Abstract The characteristics of pitting corrosion above breakdown potential E_b are studied for AISI 304 stainless steel in the solution of 1NH_2SO_4+0.5NNaCl at 25℃. In potentiodynamic study, a linear relationship between E_b and cubic root of potential scanning rate is found. The actual value of E_b is obtained by extrapolation of the scanning rate to zero. It is about +596mV(SHE) for given conditions. Results also show that, at constant potential above E_b, the pit density first increases with time and tends afterwards to a steady state density of pits (S. S. D. P.)which is reached at a current density of 10mA/cm~2. The average deepening spewed of pits Vdp(mm/min) increases with(E-E_b) (mV) according to the equation:logVdp=-7.5+2.89log(E-E_b) The time dependence of courrent density at constant potential above E_b follows the equation:logJ=a+blogt The values of slope b are different for current densities below and above 10mA/cm~2, confirming the change in corrosion processes. It is suggested that, the resistance of passivating layers to pitting corrosion can be evaluated by E_b as well as S. S. D. P., Vdp and b at a given value of (E-E_b).
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Received: 25 August 1984
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Cite this article:
Hou Wentao(Institute of Applied Chemistry; Academia Sinica; China) Jean Van Muylder and Rene Winand(Free University of Brussels; Belgium). A STUDY ON THE INITIATION AND THE PROPAGATION OF PITTING CORROSION FOR AISI 304 STAINLESS STEEL. J Chin Soc Corr Pro, 1984, 4(4): 270-276.
URL:
https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y1984/V4/I4/270
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