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北京石油化工学院2026年研究生招生接收调剂公告
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mashaohua5209

铁虫 (小有名气)

[交流] 【求助】开路电位为3V左右

我用的是碳钢X60做工作电极,甘汞电极做参比电极,铂电极做辅助电极。在测试3.5%NaCl溶液时,为什么开路电位在3V左右波动,而且不稳定,我把工作电极拿出来看下,缝隙腐蚀很严重,是什么原因啊?线路连接正确,我试了三篇了啊。
http://blog.sina.com.cn/zhaoyonghgd
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xmuxiaoyu

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小木虫(金币+0.5):给个红包,谢谢回帖交流
remove the counter electrode, measure the voltage between the working electrode and reference electrode with a voltage meter, just for the testing, to see the OCP
2楼2010-03-18 21:23:15
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mashaohua5209

铁虫 (小有名气)

好的,谢了

这个原理是什么?用玩用表测工作电极和参比电极之间的电压?
3楼2010-03-18 21:46:01
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xmuxiaoyu

金虫 (著名写手)



小木虫(金币+0.5):给个红包,谢谢回帖交流
in principle, for a potentiostat, three electrodes system, the counter electrode is used for the current circuit, the potential of working electrode is measure use a reference electrode as a reference. because we just can measure a voltage between two electrodes, can not measure anyone of them.
For the case of OCP, the current is zero, it means not current flow. so we don't need the counter electrode. a multimeter, with very high resisitant, 10M ohm, maybe, if the voltage is 1V. the current is 0.1mA, very low, is equal to OCP. then you can exclude the effect of current, not corrision will be seen
4楼2010-03-18 23:17:57
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mashaohua5209

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thank you

thank you !i will  try it!
5楼2010-03-19 08:30:24
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molly_hhu

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引用回帖:
Originally posted by xmuxiaoyu at 2010-03-18 23:17:57:
in principle, for a potentiostat, three electrodes system, the counter electrode is used for the current circuit, the potential of working electrode is measure use a reference electrode as a refere ...

I just wonder are you an expert in this area?
读万卷书不如行万里路;行万里路不如阅人无数!
6楼2010-03-20 14:16:24
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xmuxiaoyu

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no, I just look from books
7楼2010-03-20 19:03:18
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Andifly

金虫 (小有名气)

氯离子是不锈i钢网致命腐蚀物质,是硫酸根的10倍以上,不腐蚀都难啊
8楼2010-03-20 20:51:05
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