INFLUENCE OF MINOR ADDITIONS OF TA AND ND ON THE CORROSION BEHAVIOUR OF PROPELLER BRONZE IN MINERAL ACIDS.

Abstract

The influence of minor additions of Ta and Nd on the corrosion behavior of propeller bronze (82% Cu, 9% Al, 4% Ni, 4% Fe, 1% Mn) in 4% HCl, 1% HNO//3 and 1. 7% H//2SO//4 has been investigated using weight loss and potentiostatic polarization techniques. Addition of both Ta and Nd reduces the corrosion resistance in HCl and HNO//3 solutions and increases resistance in H//2SO//4 solution. The effect of these additions on some other properties such as hardness, tensile strength, percentage elongation and forgeability has also been observed.