Abstract:

Using electrochemical test method,the effect of reclaimed water used in circulating cooling water on the corrosion characteristics of stainless steel has been studied. The corrosion effects of Inhibitor TJH-3 are contrasted and analyzed by checking the polarization curve in weak polarization region,electrochemical impedance spectroscopy (EIS) and pitting corrosion potential tests,and its corrosion inhibition principles are expounded. It is shown that without adding any corrosion inhibitors,the initial passivated membrane of stainless steel is developed gradually,and stabilized in 12 hours. After stabilization,the average corrosion rate is very low(about 0.000 15 mm/a),but its pitting corrosion tendency is rather great. After adding Inhibitor TJH-3 into the system,the passivated membrane of stainless steel develops faster obviously,membrane resistance is increased,and the tendency of pitting corrosion is declined obviously. In addition,the results of pitting corrosion potential test show that every ingredient in the complex chemical agents has synergistic effect on the inhibition of stainless steel pitting corrosion.

Key words: reclaimed water, circulating cooling water system, stainless steel, corrosion, electrochemical test

摘要：

采用电化学测试方法研究了再生水用于循环冷却水时对不锈钢腐蚀特性的影响，通过测定弱极化区极化曲线、交流阻抗谱（EIS）和点蚀电位对比分析了TJH-3型缓蚀阻垢剂的缓蚀效果并阐述了其缓蚀原理。研究表明，不加缓蚀阻垢剂不锈钢腐蚀初期钝化膜逐渐发展并于约12 h达到稳定，稳定后平均腐蚀速率极低（约为0.000 15mm/a），但具有较大点蚀倾向。加入TJH-3型缓蚀阻垢剂后钝化膜增长明显增快，膜电阻增大，点蚀倾向显著降低。同时，点蚀电位测试结果表明此复配药剂中各组分对于不锈钢点蚀抑制具有协同作用。

关键词: 再生水, 循环冷却系统, 不锈钢, 腐蚀, 电化学测试

CLC Number: 

• X703.1