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| ON THE INTERGRANULAR CORROSION OF 18-8 STAINLESS STEEL AT DIFFERENT POTENTIALS |
| HUA PAO-TING;SHEN HSING-SU;TAI CHUNG-TAO;HSI SHU-YUN Institute of Applied Chemistry; Academia Sinica |
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Cite this article:
HUA PAO-TING;SHEN HSING-SU;TAI CHUNG-TAO;HSI SHU-YUN Institute of Applied Chemistry; Academia Sinica. ON THE INTERGRANULAR CORROSION OF 18-8 STAINLESS STEEL AT DIFFERENT POTENTIALS. Acta Metall Sin, 1965, 8(1): 103-135.
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Abstract The intergranular corrosion of annealed and sensitized 18—8 stainless steels at dif-ferent potentials were studied potentiostatically in 5％ and 50％ sulfuric acid. It is con-cluded that in the passivating region, the main cause of intergranular corrosion is theselective dissolution of the chromium-depleted zone. In the transpassive region, however,it was found that the sensitized steel does not corrode intergranularly whereas the an-nealed steel suffers rather severe intercrystalline attack. Moreover, titanium-stabilizedstainless steel in the annealed state also shows definite intergranular corrosion in thistrans-passive region while the same steel tempered at 700℃ suffers much less. Thus itis suggested that the intergranular attack occured here is not due to the Cr-depleted zone,but due to the less regular arrangement of the atoms or the stress at the boundaries-both can be reduced by tempering. In the secondary passive region and the secondary trans-passive region, the annealedsteel ceases to suffer while the sensitized steel shows severe intergranular attack again.It is suggested that the intergranular attack here occurs as a result of selective dissolutionof the chromium carbides at the grain boundaries. In the passive region, both steels suffer no intergranular attack. From these results it is concluded that the degree of susceptibility, the cause of inter-granular corrosion and the relative susceptibility of different steels all depend on electrodepotentials. Thus, the potentiostatic method might be used as a convenient method forpreventing, detecting and studying intergranular corrosion.
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Received: 18 January 1965
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