EFFECTS OF ION IMPLANTATION WITH RARE-EARTH ERBIUM AND CHROMIUM ON SCC BEHAVIOUR FOR GENERATOR RETAINING RING STEEL

J Chin Soc Corr Pro

1994, Vol. 14

Issue (3): 231-239 DOI:

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EFFECTS OF ION IMPLANTATION WITH RARE-EARTH ERBIUM AND CHROMIUM ON SCC BEHAVIOUR FOR GENERATOR RETAINING RING STEEL

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Abstract The effeCts of overlap-implanting rare-earth erbium and chromuim ions with high-medium energy on stress corrosion cracking (SCC) have been studied for generator retaining ring steel 50Mn18Cr4. The results of comparstive SCC tests show that: (1) The time to SCC appearance if in the nitrate solution prepared according to QHJ-79 standard for implanted specimens is postponed averagely over 6 times, and the critical current densities required to cause and maintain passivation decrease by one order of magnitude. (2) In the medium for cathodally charging of hydrogen, the steel is insensitive to hydrogeninduced corrosion (HIC); the HIC resistance can be improved by Er++Cr+ implantation remarkably. The mechanism of SCC for the steel in QHJ-79 standard solution and of improvement of resistance to SCC and HIC by ion-implantation is discussed on the basis of the results of AES-PRO, RBS, XPS-PRO, EDAX, metallography and electrochemistry tests.

Key words: generator retaining ring steel rare-earth erbium chromium ion-implantation SCC

Received: 25 June 1994

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Jin Jiucheng; Xie Zhong; Wu Cuilan; Li Jianming; Jin Hao; Zhong Qingdong (Hunan University)Wang Peida(Institute of Semiconductor;Chinese Academy Of Sciences)Long Ben; Liu Guobin(Dongfang Electrical Machinery Works). EFFECTS OF ION IMPLANTATION WITH RARE-EARTH ERBIUM AND CHROMIUM ON SCC BEHAVIOUR FOR GENERATOR RETAINING RING STEEL. J Chin Soc Corr Pro, 1994, 14(3): 231-239.

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y1994/V14/I3/231

1KatsutoshiORITA．YasumiIKEDA;TadaoIWADATEandJunjiISHIZAKA．ISIJInternational,1990,3O(8):5872于福洲编著,金属材料的耐腐蚀性,北京:科学出版社,19823诸武扬著．氢损伤和滞后断裂,北京:冶金工业出版社,19884靳九成,赵传国等编著．磨削变质层及表面改性,长沙:湖南大学出版社,1988

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