<正> 含磷钢虽具有抗大气腐蚀的特点,但耐局部腐蚀性能却较差,使其应用受到限制。在铁中加入少量磷,会增加铁在酸性溶液中的腐蚀速度且磷在晶界的偏聚能引起晶间腐蚀及应力腐蚀开裂。 目前有关磷在钢铁腐蚀中的作用,局限于探讨平衡偏聚在晶界的磷的影响,而对冷轧及退
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.
参考文献
| [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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