Corrosion Behaviour of Cast Nickel Aluminium Bronze in Sea Water

Abstract

Corrosion trials have been carried out using cast nickel aluminium bronze alloy in the as cast, heat treated and welded states, and the specimens examined using optical and electron optical techniques. It has been shown that selective phase corrosion can occur near the heat affected zone of welded cast nickel aluminium bronze which is due to the attack of the a phase adjacent to the continuous lamellar K phase. Heat treatment of this alloy considerably reduces its susceptibility to corrosion due to both stress relief and structural changes caused by the thermal treatment.