借助静态腐蚀失重法研究了硫脲/乌洛托品缓蚀剂的最佳质量比例及在5％盐酸、5％硫酸、5％硝酸溶液中对铸铁挂片的缓蚀性能的影响.结果表明,25℃下,硫脲与乌洛托品的质量比为40∶60时,在5％的盐酸、5％的硫酸和5％的硝酸溶液中,分别加入酸洗液含量0.5％、0.4％和0.5％的复合缓蚀剂时,对铸铁材质的缓蚀率可分别达到91.5％、98％和95.3％.铸铁在5％盐酸溶液中的Tafel曲线也表明硫脲/乌洛托品的加入可以抑制盐酸溶液对铸铁表面的腐蚀.%The optimal mass ratio of thiourea/methenamine corrosion inhibitor and its corrosion inhibition capability on cast iron test pieces in different acid solutions namely 5％ hydrochloric acid,5％ sulfuric acid and 5％ nitric acid were studied by static weight loss method.Results showed that when the mass ratio of thiourea and methenamine was 40∶ 60,respectively adding the composite corrosion inhibitor to the three kinds of acid solutions at 25℃,the inhibition efficiency of cast iron were 91.5％,98％ and 95.3％ respectively in 5％ HCl,5％ H2SO4 and 5％ HNO3 solution.The Tafel curve of cast iron in 5％ hydrochloric acid solution also indicated that the addition of thiourea/methenamine could inhibit the corrosion on cast iron surface caused by hydrochloric acid solution.
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