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| ROLE OF HYDROGEN IN STRESS CORROSION CRACKING OF AUSTENITIC STAINLESS STEEL IN BOILING MgCl_2 SOLUTION |
| QIAO Lijie; CHU Wuyang; XIAO Jimei (Beijing University of Iron and Steel Technology) (Manuscript received 11 April; 1985; revised manuscript 19 December; 1985) |
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Cite this article:
QIAO Lijie; CHU Wuyang; XIAO Jimei (Beijing University of Iron and Steel Technology) (Manuscript received 11 April; 1985; revised manuscript 19 December; 1985). ROLE OF HYDROGEN IN STRESS CORROSION CRACKING OF AUSTENITIC STAINLESS STEEL IN BOILING MgCl_2 SOLUTION. Acta Metall Sin, 1987, 23(3): 228-233.
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Abstract The role of hydrogen in stress corrosion cracking (SCC)of austenitic stainless steels in boiling chloride solution was investigated. It was found that the threshold stress intensities for SCC of whether type 321 or 310 steel were much lower than that for hydrogen induced cracking (HIC) during dynamic charging at high fugacity at room temperature and 160℃,and the morphologies of SCC fracture surface differed from those of HIC. In addition, the anodic polarization promoted the SCC in boiling LiCl solution and the cathodic polarization with small current density retarded even restrained the SCC: These facts are important evidences cited as lending support to the anodic path dissolution of SCC of austenitic stainless steels in boiling chloride soluton. Hydrogen entering into the specimen via precorroding in boiling MgCl_2 solution with pH=1 for 200h was about 32 ppm, and it could cause elongation reduction but no HIC.The test in fused salt at 160℃ verified that HIC could occur if hydrogen enough and supplied continuously. However, there existed a critical hydrogen concentration during dynamic charging in 1N H_2SO_4 solution or in boiling LiCl solution, below which no HIC occurred.
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Received: 18 March 1987
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1 褚武扬编著.氢损伤和滞后断裂,冶金工业出版社,1984,(即将出版)
2 姚京,褚武扬,肖纪美。金属学报,1984;20:A124
3 Wilde B E, Kim C D. Corrosion, 1972; 28: 350 |
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