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THE INFLUENCE OF SULPHATE ION ON THE CRITICAL PITTING CORROSION TEMPERATURE OF 316 STAINLESS STEEL IN AQUEOUS SOLUTION CONTAINING CHLORIDE ION |
LIAO Jiaxing; JIANG Yiming; WU Weiwei; ZHONG Cheng; LI Jin;SONG Hongwei |
Department of Materials Science; Fudan University; Shanghai 200433 |
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Cite this article:
LIAO Jiaxing; JIANG Yiming; WU Weiwei; ZHONG Cheng; LI Jin; SONG Hongwei. THE INFLUENCE OF SULPHATE ION ON THE CRITICAL PITTING CORROSION TEMPERATURE OF 316 STAINLESS STEEL IN AQUEOUS SOLUTION CONTAINING CHLORIDE ION. Acta Metall Sin, 2006, 42(11): 1187-1190 .
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Abstract The influence of sulphate ion on the pitting corrosion behavior of 316 stainless steel has been studied by measuring the relationship of corrosion current and temperature in 0.5wt.% chloride ion solution at different concentration of sulphate ion under constant applied potentials. The results showed that with the increase of sulphate ion concentration, the passivation current of 316 stainless steel increased and the Open Circuit Potential of 316 stainless steel decreased; When the concentration of sulphate ion is less than 0.42wt.%, the critical pitting temperature of 316 stainless steel is lower than the value without sulphate ion, and when the concentration of sulphate ion is more than 0.42wt.%, the critical pitting temperature is higher than that value. The inhibition and acceleration effect of sulphate ion on the pitting corrosion was discussed by analyzing the mechanism of the ion-competitive adsorption.
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Received: 22 March 2006
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