Tetsu-to-Hagane
Online ISSN : 1883-2954
Print ISSN : 0021-1575
ISSN-L : 0021-1575
The Composition Dependent Intergranular Corrosion Mechanism in Stainless Steels
Seizaburo ABEMichio KANEKOTakehisa MIZUNUMA
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1993 Volume 79 Issue 6 Pages 706-712

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Abstract

Intergranular corrosion (IGC) in stainless steels can be well explained by following two mechanisms; "Composition dependent IGC" and "Compound dependent IGC". In this paper, the composition dependent IGC mechanism was discussed. In this mechanism, it has been confirmed that IGC was induced only by the difference of corrosion rates at grainboundaries (GB) and the matrix, due to the change of the chemical composition of GB from that of the matrix.
The high concentration of P due to the GB segregation causes very severe IGC at active state corrosion potentials as in H2SO4 solution, where the Cr depleted zone never induces IGC. The Cr depleted zone is responsible for IGC in the passive state corrosion potential region as in most of standardized IGC test solutions, where only the high concentration of P at GB is not responsible for IGC.
In the next paper, the compound dependent IGC mechanism will be presented.

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© The Iron and Steel Institute of Japan
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