The mechanism of high temperature aqueous corrosion of stainless steels

The corrosion behaviour of austenitic and duplex stainless steels in artificial saliva with the addition of fluoride

Electrochemical and XPS studies of the passive film formed on stainless steels in borate buffer and chloride solutions

The composition of the passive layers formed by electrochemical oxidation at different passivation potentials on Co–Cr–Mo and Co–Ni–Cr–Mo alloys in simulated physiological solution (SPS), with and without the complexing agent EDTA, was studied by X-ray photoelectron spectroscopy. Composition as a function of depth, cationic fraction and thickness of the passive film was determined. Chromium oxide is shown to be the major constituent of the passive layer on both Co–Cr–Mo and Co–Ni–Cr–Mo alloys. The minor constituents of the passive layers, Co- and Mo-oxide in the case of Co–Cr–Mo alloy and Ni-, Co- and Mo-oxides in the case of Co–Ni–Cr–Mo alloy, are also located in the outer part of the layer. EDTA affects the formation of the passive layer on each alloy. The content of Co-, Ni- and Mo-oxide in the passive layer is lower in the presence of EDTA, thus indicating increased solubility associated with higher stability constants for complexes of metal cations with EDTA.

N. S. McIntyre

Papers

X‐Ray photoelectron spectroscopic study of the aqueous oxidation of stellite‐6 alloy