月桂酸根离子的吸附及其对N80碳钢垢下局部腐蚀的影响  

Adsorption Behavior of C_(12)H_(23)OO^- and Its Effects on Localized Underscale Corrosion of N80 Steel in NaCl Solution

作　　者：赵艳娜[1] 朱元良[1] 郭兴蓬[2] 

机构地区：[1]南阳理工学院生物与化学工程学院,河南南阳473066 [2]华中科技大学化学化工系,湖北武汉430074

出　　处：《腐蚀与防护》2008年第5期247-250,共4页Corrosion & Protection

摘　　要：利用一种闭塞腐蚀电池装置,采用极化曲线和电化学阻抗方法研究了月桂酸根离子C12H23OO-在中性NaCl溶液中在N80钢表面的吸附及其对垢下闭塞微区的影响。结果表明,C12H23OO-在耦合电流作用下迁入闭塞区后在碳钢表面形成单分子层吸附膜,抑制了电极反应的阴极过程。C12H23OO-的吸附行为符合Flory-Hug-gins等温线模型。C12H23OO-吸附膜改变了电极表面双电层结构,使金属表面膜层更加致密有序,抑制了基底金属的进一步腐蚀。An occluded corrosion cell （OCC） was used to study the adsorption behavior and the effects of organic anions（C12H23OO^-）on underscale occluded cell of N80 steel in NaCl solution by electrochemical impedance spectroscopy and polarization curve measurements.C12H23OO^-migrated into OCC to combine with Fe by complexation reaction, an adsorbed monolayer film of the inhibitor was formed on the surface of N80, the cathodic process of corrosion reaction was suppressed. The adsorption behavior of C12H23OO^- obeyed Flory-Huggins isotherm model. The adsorbed film changed the structure of the electric double layer. As the C12H23OO^- migrated into OCC, the adsorbed film on the surface of N80 tended to become more compact and orderly so that the localized underscale corrosion was inhibited.

关 键 词：腐蚀垢 闭塞腐蚀电池 碳钢 吸附 C12H23OO^- 

分 类 号：TG174.42[金属学及工艺—金属表面处理] O647[金属学及工艺—金属学]