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小木虫论坛-学术科研互动平台 » 化学化工区 » 电化学 » 腐蚀防护 » 腐蚀电位和点蚀电位能相同吗？以前没听说过这个
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毛豆5168

木虫 (小有名气)

[求助] 腐蚀电位和点蚀电位能相同吗？以前没听说过这个 已有1人参与

看到一篇文献中关于铝合金点蚀电位的说法，说点蚀电位和腐蚀电位一致，这个说法对吗？下面分别是对2个图的说明部分。求大神解答。
Fig. 4 shows typical potentiodynamic polarisation curves for the samples of AA6061, obtained in solutions of concentration 3.5% NaCl at pH values of (a) 2, (b) 6, and (c) 12, respectively. A similar shape is observed in two polarisation curves which were obtained in the slightly neutral and acidic solution, with a little difference on their cathodic branch controlling the corrosion process, indeed the current density in the slightly neutral solution is the lowest. The onset of pitting is not visible in these two cases since the pitting
potentials Epit coincided with the corrosion potentials Ecor and the anodic Tafel slopes of two curves are practically zero. From these results, it can be concluded that the main degradation mechanism in these solutions of pH values 2 and 6 is pitting corrosion and the pitting potential is independent of pH over this pH range. We can observe this on the micrographic photos shown in Figs. 11 and 12.

Fig. 5 shows an example of positive hysteresis, with pitting potential located at the same position of that of corrosion potential, repassivation potential Erp less than the Ecor and large area of the hysteresis loop, suggesting the nucleation and growth of pitting during the reverse scan [41,42]. In general, the larger the area of the hysteresis loop, the greater the susceptibility of the material to pitting corrosion.

腐蚀电位和点蚀电位能相同吗？以前没听说过这个
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1楼 2015-06-03 22:33:36
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goshen

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【答案】应助回帖

感谢参与，应助指数 +1
没太看，不过铝在强酸性和强碱性溶液中都不会钝化吧，只有在中性溶液中才会钝化。
1mA/cm2大的阳极电流，怎么会是钝化？明明是活性溶解的极限电流嘛。
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2楼2015-06-04 11:23:42
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