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| Effect of Co-Ni-Cr-W and Ni-Cr-B-Si Alloy Coatings Upon the Hot Corrosion-fatigue Resistance of Several Heat-Resisting Steels |
| Wu Zhongxing Wang Baochu Jin Dashen Xie Meiying Liu Xin and Lu Shiqin (Central Iron and Steel Research Institute; Ministry of Metallurgical Industry) |
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Abstract The hot corrosion-fatigue resistance of three heat-resisting steels, namely: 4CrlOSi2Mo, 18SR, 20-14 and two alloy coatings Co-50, Ni-81 are studied in this paper. For the sake of contrast, the "HCF" ( hot corrosionfatingue test) method was used under an automatic immediate comparative condition with the spraying of NaCl-Na_2SO_4 salt solution. The degree of corrosion failure is measured by depth of corrosion of samples. The hot corrosionfatigue failure process of various steels and the veasons for effective resisting hot corrosion-fatigue of two alloy coatings are investigated by means of metallography, X-ray diffraction and electron probe analysis techniques. In the "HCF" testing condition, it is found that:(1) The loose corrosion products on heat-resisting steels crack and flake away layer after layer. Sulphur and oxygen penetrate immediately into the interior of steels, with oxygen penetrateation deeper than that of sulphur. (2) The degree of hot corrosion-fatigue failure of the heat-resisting steels depends mainly on the type of their internal erosion zone. (3)A compact protective film is formed on the surface of alloy coatings, no matter it is Ni-base or Co-base alloy coatings. This test can be successfully applied to the study of coatings used for extending the service life of internal combustion engine exhaust valves.
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Received: 25 August 1981
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Cite this article:
Wu Zhongxing Wang Baochu Jin Dashen Xie Meiying Liu Xin and Lu Shiqin (Central Iron and Steel Research Institute; Ministry of Metallurgical Industry). Effect of Co-Ni-Cr-W and Ni-Cr-B-Si Alloy Coatings Upon the Hot Corrosion-fatigue Resistance of Several Heat-Resisting Steels. J Chin Soc Corr Pro, 1981, 1(4): 60-67.
URL:
https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y1981/V1/I4/60
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[1] Mechanisms of Na_2So_4-Induced Accelerated Oxidation, Corrosion Science. Vol. 15, No. 11-12, 721 (1975)
[2] Hot Corrosion of Superalloys, 《High-temperature Materials in Gas Turbines》, by P. R. Sahm and M. O. Speidel, 283(1973)
[3] 王葆初等、中国腐蚀与防护学报,Vol.1,No.1,60(1981) |
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