余氯对苯并三氮唑缓蚀效果的影响

Influences of Residual Chlorine on Corrosion Inhibiting Effects of Benzotriazole

利用动电位极化曲线和腐蚀挂片两种测试方法对铜缓蚀剂BTA性能进行了对比评价,并考察了余氯对BTA缓蚀效果的影响。结果表明:动电位极化曲线法测试的腐蚀速率结果比腐蚀挂片法要大,更适合于用来筛选不同的铜缓蚀剂;在现场装置酸洗后开车时,如果系统有铜换热设备,BTA的投加浓度要大于2mg/L,才能保证铜换热器起始腐蚀的防护,当余氯浓度控制在0.2mg/L以内时,余氯对苯并三氮唑缓蚀效果的影响不大。

This article constrastively discusses thee evaluation of copper corrosion inhibitor by potentiodynam- ic polarization curve and corrosion coupon testing,was contrastively discussed,and studies the influences of residual chlorine on copper corrosion inhibiting effect of benzotriazole was studied.. The results showed that the corrosion rates by potentiodynamic polarization curve testing was is larger than corrosion eoupon＇~s, ,and potentiodynamic polarization curve testing iswas suitable for screening of copper corrosion inhibitors;Wwhen the heat exchangers were are run on after picking in site, the adding concentration of BTA was is more than 2mg/L in copper exchanger to inhibit starting corrosion. ;when the concentration of residual chlorine is be- low 0.2mg/L,the impact of residual chlorine on corrosion inhibiting effect of benzotriazole wasis slight.