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| A Study of De-alloying Corrosion of High-Molybdenum Nickel-base Alloys in Fused Salts |
| Gang Yiming(Beijing Iustitute of Iron and Steel; The Ministry of Metallurgy) |
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Abstract Nickel-base alloy, especially Hastelloy N, is a highly corrosion-resistant material developed for fused salt reactor . The experimental results as. reiorted in last literature were obtained in highly pure fused fluoride fuels with dechromisation as the main reaction. The present work is conducted in ordinary fused fluorides or nitrates in static state. The structure of surface. corrosion layer, the influence of Mo on dealloying corrosion at crystal boundaries and the process of stress corrosion cracking have been studied. It is shown that there is selective precipitation of Mo in addition to Cr. The effect of Mo is twofold. On the one hand, as the Mo content in the alloy is increased, the relative speeds of dealloying of Mo and Cr along crystal boundaries and within the crystals are changed accordingly, thus intercrystalline corrosion is restrained. On the other hand,the surface layer is essentially a loose, porous layer of pure Ni owing to dealloying of Mo and Cr, and, despite of rather low speed of general corrosion of Hastelloy, the. dealloying corrosion at crystal boundaries will be accelerated under tensile stress, thus the selective dealloying of Mo and Cr along crystal boundaries will in turn promote the initiation and growth of crack and will lead to. intercrystalline stress corrosion cracking.
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Received: 25 June 1981
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[10] #12
[11] #12
[12] #12
[13] 上海冶金研究所,硝盐腐蚀试验报告,(1972)
[14]#12 |
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