Ce^(3+)和钼酸钠对X80钢的缓蚀协同效应  

Synergistic Inhibition of X80 Steel Corrosion by Combination of Cerium Nitrate and Sodium Molybdate

作　　者：朱艳华[1] 庄稼[1] 古户波 冷帅[1] 曾宪光[2,3] 

机构地区：[1]西南石油大学材料科学与工程学院,四川成都610500 [2]四川理工学院材料与化学工程学院,四川自贡643000 [3]材料腐蚀与防护四川省重点实验室,四川自贡643000

出　　处：《稀土》2015年第1期40-47,共8页Chinese Rare Earths

基　　金：高等学校博士学科点专项科研基金资助(20135121110008);材料腐蚀与防护四川省重点实验室重点基础研究项目资助(2012CL04)

摘　　要：为了研究稀土与钼酸盐之间的缓蚀协同效应,采用失重法和电化学法研究了盐酸介质中,Na2MoO4、Ce(NO3)3以及Na2MoO4-Ce(NO3)3复合缓蚀剂对X80管线钢的缓蚀作用。根据动电位极化曲线法计算了钢试样在不同的盐酸溶液中,发生溶解反应的动力学与热力学参数(表观活化能Ea、反应焓变ΔHa以及反应熵变ΔSa),证明了实现缓蚀反应的可能性和现实性,同时表明Na2MoO4-Ce(NO3)3复合缓蚀剂的存在使钢试样表面形成了一层更有序致密的薄膜,因此增大了钢试样发生溶解反应的表观活化能,降低了腐蚀速度。通过对比实验发现,Na2MoO4和Ce(NO3)3对X80管线钢产生了明显的协同缓蚀作用,且缓蚀效率及其相关参数受到温度变化的明显影响。The corrosion inhibition effects of sodium molybdate,cerium nitrate and Mo-Ce（Ⅲ） composite corrosion inhibitor on X80 pipeline steel in hydrochloric acid solution were investigated by chemical and electrochemical methods. The apparent activation energy（Ea）,enthalpy（ΔHa） and entropy（ΔSa） of dissolution reaction of X80 pipeline steel in hydrochloric acid solution without and with different inhibitors were calculated according to the parameters obtained by polarization curves.The implementation possibility and reality of the corrosion inhibition reaction were proved. And the results showed that Mo-Ce composite corrosion inhibitor makes the steel specimen surface to form a more orderly dense layer,and then increases the thermo dynamic parameters of dissolution reaction of X80 pipeline steel,decreases the corrosion rate. Through the comparative experiments,it was found that cerium nitrate with sodium molybdate produced strong synergistic effect on corrosion inhibition for X80 pipeline steel.

关 键 词：缓蚀剂 盐酸 协同效应 热力学 动力学 

分 类 号：TB3[一般工业技术—材料科学与工程] TG174.42[金属学及工艺—金属表面处理]