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| CAUSTIC STRESS CORROSION CRACKING OF ALOY 800 PART 1. THE EFFECT OF APPLIED POTENTIAL |
| YANG Wu KONG Desheng ZHAO Guozheng HUANG Delun ZHANG Yunke CHEN Shenhao(Shanghai Research Institute of materials; Shanghai 200437) (Dept. of Chemistry; Shandong University; Jinan 250100) |
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Abstract The SCC behavior of Alloy 800 in boiling 50%NaOH solution containing 0.3% SO2 and 0.3%Na2S2O3 was studied using C-ring specimens at controlled potentials. A discussion was given based on the results of SCC tests, anodic polarization curves and AES analyses. Alloy 800 exhibited high susceptibility to caustic SCC in the passive region at potentials more noble than ca. -0.30V (SCE) and was much less susceptible to SCC at potentials more active than ca. -0.45V (SCE). The difference in SCC susceptibility was associated with the composition of surface films formed in different potential ranges. The surface film formed at higher potentials consisted of oxides of Ni in predomination with some Fe and little Cr, while that formed at lower potentials was composed of oxides of Cr, Ni and Fe. The latter showed much higher resistance to caustic SCC.
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Received: 25 June 1997
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Cite this article:
YANG Wu KONG Desheng ZHAO Guozheng HUANG Delun ZHANG Yunke CHEN Shenhao(Shanghai Research Institute of materials; Shanghai 200437) (Dept. of Chemistry; Shandong University; Jinan 250100). CAUSTIC STRESS CORROSION CRACKING OF ALOY 800 PART 1. THE EFFECT OF APPLIED POTENTIAL. J Chin Soc Corr Pro, 1997, 17(3): 181-187.
URL:
https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y1997/V17/I3/181
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