通过在某电厂3号机组发电机内冷水系统上安装腐蚀测量旁路，采用电化学方法对碱性富氧运行工况下铜电极的实际腐蚀速率进行测量，并进行内冷水溶解氧含量变化试验，研究溶解氧含量对铜电极腐蚀速率的影响规律。结果表明，碱性富氧运行工况完全满足发电机铜线棒的腐蚀防护要求，但溶解氧运行工况的转变有增大铜腐蚀产物脱落或溶解的风险。建议电厂监测内冷水溶解氧含量，维持系统长期处于富氧工况运行。
A bypass for corrosion rate measurement of copper electrode was installed in generator inner cooling water system of unit 3 in a power plant and its real corrosion rates were obtained by electrochemical method.Through tests of changing the dissolved oxygen content in inner cooling water,its influence on the corrosion rate was also investigated.Results showed that enriched dissolved oxygen operating condition could provide excellent protection for corrosion of copper bars but transformating to other conditions should be avoided because of the increasing risk of dissolving and peeling off of corrosion products.Monitoring the dissolved oxygen content in inner cooling water and sustaining the system operating in enriched dissolved oxygen condition were suggested.
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