Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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Transactions of Nonferrous Metals Society of China

Vol. 10    No. 2    April 2000

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Galvanic effects on electrochemical behaviors of bare surface of304stainless steel①
SUN Dong-bai(孙冬柏), LI Tao(李 涛), YU Hong-ying(俞宏英), YANG De-jun(杨德钧)

The Corrosion, Erosion and Surface Technology Laboratory of the Ministry of Metallurgy Industry of China,
Department of Surface Science and Corrosion Engineering, University of Science and Technology Beijing, Beijing100083, P.R.China

Abstract:The bare surface of 304 stainless steel is produced by the fast fracture method. The influence of the surface galvanic cell on the electrochemical behaviors of bare surface of 304 stainless steel has been investigated in H2SO4solutions with different concentrations. The results show that the solution corrosivity level and the area ratio influence the surface galvanic effects caused by the inhomogeneity between the free-film surface of alloy and the passive surface. The surface galvanic effects can speed up the dissolution rate of the bare surface of the alloy and will change the electrochemical behavior of bare surface. With the increase of the area ratio between passive surface and fractured surface, the galvanic potential becomes more positive and, in the range of passive potential, both galvanic current and the peak fracture current increase evidently.


Key words: stainless steel; alloy; galvanic effect; electrochemistry

ISSN 1004-0609
CN 43-1238/TG

ISSN 1003-6326
CN 43-1239/TG

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