24小时热门版块排行榜    

Znn3bq.jpeg
查看: 1887  |  回复: 1

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
2.jpg
回复此楼

» 猜你喜欢

» 本主题相关价值贴推荐,对您同样有帮助:

已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖

goshen

铁杆木虫 (职业作家)

【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。
走错一步,满盘皆输
2楼2015-06-04 11:23:42
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖
相关版块跳转 我要订阅楼主 毛豆5168 的主题更新
最具人气热帖推荐 [查看全部] 作者 回/看 最后发表
[文学芳草园] 献血感触 +6 呀呀好傻 2026-05-19 6/300 2026-05-19 17:23 by kopsia
[基金申请] 2026山东省优青 +3 luckinging 2026-05-14 4/200 2026-05-19 16:15 by 52wls
[论文投稿] Sci. Bull. 悲剧经验 +4 jyang1999 2026-05-16 4/200 2026-05-19 10:56 by maolC
[考博] 找博士生导师 +6 小代想上岸 2026-05-15 7/350 2026-05-19 10:22 by free_fisher
[教师之家] 上海大学实验技术岗位非升即走 +10 嘻嘻哈哈乐呵呵 2026-05-15 11/550 2026-05-19 10:03 by 嘻嘻哈哈乐呵呵
[基金申请] 别被青基扩招骗了!26年科研内卷才刚刚开始 +3 国自然国社科中 2026-05-14 4/200 2026-05-19 08:48 by archvillain
[考博] 2026博士还有哪些学校有名额 +7 小王求读研 2026-05-15 8/400 2026-05-19 08:27 by zhyzzh
[基金申请] 面上本子正文33页,违规吗?会被低分嘛? +8 1234567wang 2026-05-17 10/500 2026-05-18 18:52 by zzahkj
[基金申请] 国自然上会要求 +5 无名者登山 2026-05-18 9/450 2026-05-18 17:50 by BlakeReary
[硕博家园] 考博自荐 +5 科研狗111 2026-05-13 6/300 2026-05-18 11:22 by 糊糊涂涂好
[基金申请] 青C资助名额大幅增加! +12 西葫芦炒鸡蛋 2026-05-13 16/800 2026-05-18 10:02 by Equinoxhua
[硕博家园] 我在等一个没有答案的答案 +3 Love_MH 2026-05-17 3/150 2026-05-18 02:22 by 竹林孤影
[文学芳草园] 半夜喝咖啡 +3 myrtle 2026-05-15 5/250 2026-05-18 01:03 by 小沈2018
[考博] 光量子物理方向 博士招生 1人(2026.09) +3 sandyworld 2026-05-15 4/200 2026-05-17 14:38 by sandyworld
[有机交流] 求助2,4-二氯-5-嘧啶甲醛的合成方法 20+3 光吃不拉 2026-05-14 6/300 2026-05-16 19:46 by Equinoxhua
[有机交流] 求有机合成大神指点三硫酸乙烯酯(CAS:2793408-99-6)的合成路线 30+3 Leekmid 2026-05-13 10/500 2026-05-16 16:37 by czyzsu
[有机交流] 如何实现卤原子转化 +3 BT20230424 2026-05-15 5/250 2026-05-16 16:20 by czyzsu
[硕博家园] 申请博士 +3 呃?呃 2026-05-15 3/150 2026-05-16 11:01 by a4742549
[文学芳草园] 风把牡丹吹跑了 +5 myrtle 2026-05-12 9/450 2026-05-15 15:27 by myrtle
[考博] 26应届毕业生考博求助 +3 wo一定上岸 2026-05-13 3/150 2026-05-14 21:47 by 明海天涯
信息提示
请填处理意见