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| EFFECT OF PHOSPHORUS CONTENT ON ELECTROCHEMICAL BEHAVIOR OF COLD ROLLED AND ANNEALED Fe-P ALLOYS |
| Ning Hua and Zhang Lixin (Institute ofCorrosion and Protection of Metals; Academia Sinca) |
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Abstract The effects of P-content on electrochemical behavior of the cold rolled Fe-P alloys containing 0.007 wt％,0.06 wt％,0.09 wt％ phosphorus,untreated,annealed at 450℃ for recovery and at 700℃ for recrystallization respectively in vacuum have been studied by means of both potentiodynamic and potentiostatic measurements. The results show that phosphorus promotes the anodic dissolution of the iron electrode in 55％ Ca (NO_3)_2 and retards the formation of passive films of the iron. Especially, it is also found that the phos-phorus segregated to the dislocations and grain boundaries making it even more difficult for iron to form passive films after annealing for recovery and recrystallization. Segregated phosphorus at the grain boundaries is responsible for the tendency of enhanced inter-granular corrosion and the reduced localised corrosion resistance of iron.
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Received: 25 April 1992
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[1] 胡德昌,金属结构与抗蚀.宇航出版社,1987年,P.261
[2] Kupper, J., Erhart, and Grabke, H. J, Corros, Sci., 21, 227(1981)
[3] Briant, C. L., Corresion, 36, 497(1980)
[4] 宁华,张立新,金属学报,28(5) ,A348(1990) |
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