EFFECTS OF HYDROGEN ON PITTING SUSCEPTIBILITY OF TYPE 310 STAINLESS STEEL

J Chin Soc Corr Pro

1998, Vol. 18

Issue (3): 233-236 DOI:

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EFFECTS OF HYDROGEN ON PITTING SUSCEPTIBILITY OF TYPE 310 STAINLESS STEEL

QIAO Li-jie ZENG Yi-min CHU Wu-yang (Department of Materials Physics; University of Science and Technology Beijing; Beijing 100083)

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Abstract Type 310 stainless steel foils were precharged with hydrogen at different current densities. The effects of hydrogen on the pitting susceptibility were investigated by carrying out the ASTM-G48 standard ferric chloride tests. The variations of pit density, pit size distribution, average pit diameter and apparent pit area percentage with hydrogen charging current density and immersion time were statistically examined. Hydrogen in 310 stainless steel greatly promoted the pitting initiation and the pit growth. Average pit diameter D increased linearly with logarithm of immersion time t, i.e., D=αlnt+β. The value of constant a increased with the rise of charging current density. The hydrogen interactions with defects both in surface film and metal substrate were used to explain its deleterious effects on the resistance of pitting corrosion. It was considered that hydrogen accelerated pitting corrosion mainly by formation of positive charge regions around defects in the surface film.

Key words: Hydrogen Pitting susceptibility Stainless steel Defects

Received: 25 June 1998

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QIAO Li-jie ZENG Yi-min CHU Wu-yang (Department of Materials Physics; University of Science and Technology Beijing; Beijing 100083). EFFECTS OF HYDROGEN ON PITTING SUSCEPTIBILITY OF TYPE 310 STAINLESS STEEL. J Chin Soc Corr Pro, 1998, 18(3): 233-236.

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y1998/V18/I3/233

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