W-Ce复合缓蚀剂对X80管线钢的缓蚀性能及机理研究  

The Anti-corrosion Performance and Mechanism of W-Ce Compounded Inhibitor on X80 Steel

作　　者：郑超超 庄稼[1] 胡克 赵远山[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》2017年第5期83-91,共9页Chinese Rare Earths

基　　金：2013年高等学校博士学科点专项科研基金课题(20135121110008);材料腐蚀与防护四川省重点实验室开放基金项目(2013CL13)

摘　　要：为了研究Na_2WO_4·2H_2O、Ce(NO_3)_3·6H_2O单一缓蚀剂以及Na2WO_4·2H_2O-Ce(NO_3)_3·6H_2O(简写为:W-Ce)复合缓蚀剂对X80管线钢的缓蚀作用,采用失重法计算钢试样在不含和含有不同缓蚀剂的中性Na Cl介质中的缓蚀效率,结合SEM表征确定出,在35℃恒温条件下,780 mg·L^(-1)Na_2WO_4·2H_2O与660 mg·L^(-1)Ce(NO_3)_3·6H_2O复配得到的W-Ce复合缓蚀剂具有最高的缓蚀效率,达99.01%。根据EDS分析和多酸配合物的理论,探究了W-Ce复合缓蚀剂的缓蚀机理和模型。最终认为,W-Ce复合缓蚀剂对X80钢片的缓蚀作用,主要是通过Ce^(3+)和WO_4^(2-)形成的杂多酸[Ce(WO_4)_3]_n^(3-)与钢片表面的Fe配位吸附作用,形成一层缓蚀膜,从而隔绝腐蚀介质,产生了优良的抑制腐蚀效果。It was investigated that the corrosion inhibition effects of sodium tungsten,cerium nitrate and W-Ce compoun- ded inhibitor on X80 pipeline steel in sodium chloride solution. The inhibition efficiency of the steel calculated by weight-loss method. Combined SEM determined the highest inhibition efficiency （reached 99.01% ） of W-Ce compounded inhibitor in the 780 mg· L^-1 sodium tungsten and 660 mg · L^-1 cerium nitrate at 35 ℃. According to the analysis of EDS and the theory of the multi acid complexes, the inhibition mechanism and model of W-Ce compounded inhibitors were explored. It concludes that the anti-corrosion action of W-Ce compounded inhibitor on X80 steel produces excellent corrosion inhibition effect, which is mainly got by a layer of corrosion film. The film is formed from heteropoly acid [ Ce（ WO4 ） 3 ] 3- through Ce3 ＋ and WO4^2-- and co- ordinates with Fe, adsorbing on the surface of steel to isolate corrosion medium.

关 键 词：缓蚀剂 X80管线钢 缓蚀性能 缓蚀机理 

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]