Abstract

REGIS JUNIOR, Oscar; SILVA, José Maurílio da; PORTELLA, Kleber Franke  and  PAREDES, Ramon Sigifredo Cortes. Development of Nb₂O₅|Cu composite as AISI 1020 steel thermal spray coating for protection against corrosion by soil in buried structures. Quím. Nova [online]. 2012, vol.35, n.8, pp. 1517-1521. ISSN 0100-4042.  http://dx.doi.org/10.1590/S0100-40422012000800005.

An Nb₂O|Cu corrosion-resistant coating was developed and applied onto AISI 1020 steel substrate by Powder Flame Spray. A galvanostatic electrochemical technique was employed, with and without ohmic drop, in four different soils (two corrosively aggressive and two less aggressive). Behavior of coatings in different soils was compared using a cathodic hydrogen reduction reaction (equilibrium potential, overvoltage and exchange current density) focusing on the effect of ohmic drop. Results allow recommendation of Nb₂O₅|Cu composite for use in buried structure protection.

Keywords : soil corrosion; surface coating; Nb₂O₅.