A effect of sodium dodecylsulfate on the corrosion of copper in sulphuric acid media

被引：121

作者：

Fuchs-Godec, R ^{[1
]}

Dolecek, V ^{[1
]}

机构：

[1] Univ Maribor, Fac Chem & Chem Engn, Maribor 2000, Slovenia

来源：

COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS | 2004年 / 244卷 / 1-3期

关键词：

corrosion inhibitor; surfactants; potentiodynamic polarisation; copper; Langmiur isotherm; critical micelle concentration; sulphuric acid;

D O I：

10.1016/j.colsurfa.2004.05.015

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The effect of sodium dodecylsulfate (SDS) on copper corrosion in a solution of 0.5 M H2SO4 + xM SDS was studied using electrochemical polarisation measurements. The critical micelle concentration (CMC) of SDS in 0.5 M H2SO4 is 8 x 10(-4) M, and the experimental concentrations of SDS were in the range below and above the CMC. It was found that SDS is a good anodic inhibitor at lower anodic overpotentials, i.e. very close to the rest potential. Adsorption of the inhibitor obeys the Langmuir isotherm. Plots of log [theta/(1-theta)] versus log c(inh) yielded straight lines with a slope change at the CMC. Accordingly, the CMC could be determined from these electrochemical measurements. The values of DeltaG(ads) calculated from the Langmuir plots are negative, suggesting that the inhibitive action of SDS in 0.5 M H2SO4 results from the electrostatic adsorption Of C12H25SO4- ions onto the positively charged copper surface. (C) 2004 Elsevier B.V. All rights reserved.

引用

页码：73 / 76

页数：4

共 13 条

[11] Effect of sodium dodecylsulfate and benzotriazole on the interfacial behavior of Cu/Cu(II), H2SO4 [J].