期刊
SURFACE & COATINGS TECHNOLOGY
卷 184, 期 2-3, 页码 133-140出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.surfcoat.2003.11.018
关键词
corrosion; inhibitor; carbon steel; impedance; x-ray photoelectron spectroscopy (XPS)
Electrochemical and surface analytical techniques were combined in order to investigate the corrosion inhibition of a carbon steel rotating disc electrode (rde) by N-phosphono-methyl-glycine (NPMG)/Zn2+ mixtures with a concentration ratio of 1:1 between NPMG and zinc cations, in chloride solutions. From polarization curves it was shown that the NPMG/Zn2+ mixture retarded both the anodic and cathodic partial reactions of the corrosion process. Inhibition efficiency, estimated from electrochemical impedance measurements, increased from approximately 85 to 95% when inhibitor concentration increased from 10 to 100 mg/l. Analysis of the composition with XPS suggested that the films consisted mainly of hydrous ferric oxides (Fe(OH)(3) and FeOOH), with small amounts of Fe-NPMG complex, ZnO and corrosion products. AES depth profiling showed that the most protective surface film (that formed in the solution containing 100 mg/l of inhibitor) was thicker compared to that formed in the solution with low inhibitor concentration. (C) 2003 Elsevier B.V. All rights reserved.
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