INVESTIGADORES
VALCARCE Maria beatriz
artículos
Título:
Surface characterization of copper, zinc and brass in contact with tap water inhibited with phosphate ions
Autor/es:
YOHAI L.; VAZQUEZ M.; W. SCHREINER; M.B. VALCARCE
Revista:
APPLIED SURFACE SCIENCE
Editorial:
ELSEVIER SCIENCE BV
Referencias:
Lugar: Amsterdam; Año: 2011 vol. 257 p. 10089 - 10095
ISSN:
0169-4332
Resumen:
The composition of the surface layers has been investigated on copper, zinc and brass in contact withmoderately hard, highly carbonated and chloride rich artificial tap water (ATW). Cyclic voltammetry,reflectance spectroscopy, X-ray diffraction, Raman spectroscopy and X-ray photoelectron spectroscopyhave been used to identify the changes in composition that result from the incorporation of sodiumorthophosphate to ATW. The results showed that when PO43− is added, the film changes its compositionand it also becomes thinner, denser and more compact. On copper, the presence of CuO in the passivefilm 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 Zn3(PO4)2 layer hindersCu(I) dissolution. A mechanism explaining the effect of this inhibitor is proposed, which accounts for theexperimental results.
