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利用原子力显微镜成像技术和离子选择性测量研究了月桂酸根离子(C_(12)H_(23)O_2~-)对N80钢表面腐蚀垢层性质的影响.结果表明,C_(12)H_(23)O_2~-在表面垢层吸附并扩散进入垢下闭塞区,闭塞阳极表面粗糙度和相位对比度减小,腐蚀受到了抑制;C_(12)H_(23)O_2~-的吸附使垢层由阴离子选择性变为阳离子选择性,抑制Cl~-向闭塞区迁移,减弱了闭塞区的酸化自催化效应;C_(12)H_(23)O_2~-在垢层表面和垢内微孔定向排列,垢层由亲水性变为疏水性,离子迁移阻力增大.提出了垢层表面的物理模型,较好地解释了C_(12)H_(23)O_2~-的作用机制.
The effects of lauric acid ion (C 12 H 23 O 2 ~ -) on the corrosion and scale properties of the surface of N80 steel were studied by atomic force microscopy and ion selective measurements. The results showed that the C_ (12) H_ (23) O_2 ~ - adsorbed on the surface scale layer and diffused into the occluded area, the surface roughness and phase contrast of the closed anode decreased, and the corrosion was inhibited. The adsorption of C_ (12) H_ (23) O_2 ~ Selectivity to cation selectivity, inhibition of Cl ~ - migration to the occlusion zone, weakening the occlusion zone acidification autocatalytic effect; C_ (12) H_ (23) O_2 ~ - scale on the surface and scale pores aligned, The scale changes from hydrophilic to hydrophobic and ion mobility increases, and a physical model of the scale surface is proposed to explain the mechanism of C_ (12) H_ (23) O_2 ~ - well.