低硬度循环冷却水中Cl^-、SO_4^(2-)及水处理剂对304不锈钢腐蚀行为的影响  

CORROSION BEHAVIORS OF 304 STAINLESS STEEL IN LOW HARDNESS COOLING WATER CONTAINING Cl^1,SO_4^(2-) AND RP-98H WATER TREATMENT AGENT

作　　者：曲秀华[1] 许淳淳[1] 吕国诚[1] 程海东[1] 

机构地区：[1]北京化工大学材料科学与工程学院,北京100029

出　　处：《中国腐蚀与防护学报》2009年第3期187-190,共4页Journal of Chinese Society For Corrosion and Protection

基　　金：中石化项目(No.306021)

摘　　要：采用极化曲线、电化学噪声、电化学阻抗谱(EIS)和能量色散谱(EDS)等方法研究Cl^-、SO_4^(2-)及水处理剂RP-98H对304不锈钢在低硬度循环冷却水中腐蚀行为的影响.探讨了RP-98H对304不锈钢在低硬度循环冷却水中的缓蚀机理.结果表明,Cl^-增强了304不锈钢的点蚀敏感性,SO_4^(2-)-能够减缓Cl^-的侵蚀,而RP-98H能够在304不锈钢表面迅速成膜,提高其点蚀电位.该水处理剂为混合型水处理剂,其缓蚀率可达84.8%,最佳使用浓度为100 mg/L.The polarization curves, electrochemical noise, electrochemical impendence spectroscopy（EIS） and energy dispersive spectrometry（EDS） were employed to investigate the corrosion behaviors of 304 stainless steel （SS） in simulated low hardness cooling water containing Cl^-,SO4^2-. The influence of RP-98H water treatment agent on the corrosion of 304 SS and the corresponding inhibition mechanism were also studied. The results showed that, corrosive ion Cl^- increased the pitting susceptibility of 304 SS and SO4^2- reduced the effect of Cl^-, while RP-98H rapidly produced a layer of film which is capable of improving the pitting potential of 304 SS and inhibiting the corrosion. RP-98H is a type of mixed water treatment agent with the inhibition efficiency over 84.8%, and the excellent concentration for the system of 304 SS-low hardness cooling water is proved to be 100 mg/L.

关 键 词：水处理剂 孔蚀 低硬度循环水 304不锈钢 

分 类 号：TG174.4[金属学及工艺—金属表面处理]