Surface characterization of copper, zinc and brass in contact with tap water inhibited with phosphate ions

被引:24
作者
Yohai, L. [1 ]
Schreiner, W. H. [2 ]
Vazquez, M. [1 ]
Valcarce, M. B. [1 ]
机构
[1] UNMdP, Fac Ingn, INTEMA, Div Corros, Mar Del Plata, Buenos Aires, Argentina
[2] Univ Fed Parana, Dept Fis, Lab Superficies & Interfases, BR-81531990 Curitiba, PR, Brazil
关键词
Passive film; Copper; Zinc; Brass; Tap water; ELECTROCHEMICAL-BEHAVIOR; CORROSION INHIBITION; CHEMICAL-COMPOSITION; DRINKING-WATER; ANODIC FILMS; ALPHA-BRASS; CHLORIDE; SPECTROSCOPY; DISSOLUTION; SULFATE;
D O I
10.1016/j.apsusc.2011.07.002
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
dThe composition of the surface layers has been investigated on copper, zinc and brass in contact with moderately hard, highly carbonated and chloride rich artificial tap water (ATW). Cyclic voltammetry, reflectance spectroscopy, X-ray diffraction, Raman spectroscopy and X-ray photoelectron spectroscopy have been used to identify the changes in composition that result from the incorporation of sodium orthophosphate to ATW. The results showed that when PO43- is added, the film changes its composition and it also becomes thinner, denser and more compact. On copper, the presence of CuO in the passive film can be correlated to the improvement in the corrosion behavior in the presence of phosphate ions. In the case of brass, the development of a thinner, compact and less porous Zn-3(PO4)(2) layer hinders Cu(I) dissolution. A mechanism explaining the effect of this inhibitor is proposed, which accounts for the experimental results. (C) 2011 Elsevier B.V. All rights reserved.
引用
收藏
页码:10089 / 10095
页数:7
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