DEVELOPMENT OF Nb2O5|Cu COMPOSITE AS AISI 1020 STEEL THERMAL SPRAY COATING FOR PROTECTION AGAINST CORROSION BY SOIL IN BURIED STRUCTURES

DEVELOPMENT OF Nb2O5 vertical bar Cu COMPOSITE AS AISI 1020 STEEL THERMAL SPRAY COATING FOR PROTECTION AGAINST CORROSION BY SOIL IN BURIED STRUCTURES. An Nb2O vertical bar 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 vertical bar Cu composite for use in buried structure protection.