Abstract
The electrochemical behaviour of a number of nickel-containing alloys has been studied in solutions of pure phosphoric acid, and the effect of varying the acid concentration and the alloy composition determined.
The potential/current density curves show active, passive and transpassive regions, but the corrosion appears to take place mainly under conditions of active dissolution. The active regions of the curves are complex and show as many as four distinct current maxima. The appearance of these maxima is related to the corrosion behaviour of the alloys, and to the effect that compositional changes have upon this behaviour, which is in turn attributed to the formation of various orthophosphate and pyrophosphate complexes.
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