A Study on the Crevice Corrosion for Ferritic Stainless Steel by Micro Capillary Tube Method
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Abstract
The aim of this study is to investigate the initiation and propagation of crevice corrosion for ferritic stainless steel in artificial crevice based on micro capillary tube method. The 430 stainless steel in artificial crevice is potentiostatically polarized in different sodium chloride solutions. Potentiodynamic and potentiostatic polarization data were measured in situ. The potentials in the crevice were measured by depth profile using the 0.04mm diameter micro capillary tube inserted in the crevice. The potentials in the crevice ranged from -220mV to -360mV vs SCE from opening to bottom of crevice, which are lower than the external surface potential, -200mV vs SCE. Such a potential drop induced the change of the metal surface state from passive to active. The surface of metal is located in passive state in -200mV but the inner surface keeps active state below -220mv. Thus these results show that the IR drop mechanism in the crevice was more objective for evaluation and the method was easier to reproduce. Therefore the potential drop is one of the reasons for crevice corrosion by measuring the potentials in narrow crevice with a new micro measuring system.
참고문헌 (5)
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