SURFACE COMPOSITION OF THE SCALE ON Ni–Cu ALLOY FORMED IN NITRIC OXIDE

Abstract
X-ray photoelectron spectroscopy(ESCA) and Auger electron spectroscopy(AES) were adopted for an examination of the surface composition of scale on Ni–Cu alloy(64%Ni) formed in nitric oxide at 700°C. The surface layer of the scale was mainly composed of NiO caused by preferential oxidation of nickel in the alloy by nitric oxide.