Mechanism of corrosion resistance of nickel-molybdenum alloys
With the use of a combination of electrochemical and γ-ray spectrometric methods and also of photoelectronic spectroscopy the rules of partial processes of dissolution of the components of nickel-molybdenum alloys and of the change in composition of their surface as a result of dissolution were investigated.
The existence of two basic areas of potentials having the greatest value for industrial use of the alloys was established. Considerations were given on the probably mechanisms of corrosion resistance of the alloys according to which the high retarding action of molybdenum and the investigated inhibitors (I− ions and propargylic alcohol) are caused by blocking of active centers of the surface being dissolved. Together with this, with sufficiently negative potentials it is possible to have an additional retarding effect from the passivating film formed here, which is enriched with molybdenum oxides.
KeywordsOxide Alcohol Spectroscopy Molybdenum Corrosion Resistance
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