Abstract
The corrosion-abrasion behaviour of several types of stainless steel in phosphoric acid has been studied using electrochemical techniques. The depassivation action of the abrasive was shown to depend on the nature of the material and on the aggressiveness of the medium. In particular, the existence of a synergy between the abrasive and the impurities (chloride and sulphuric acid) in the phosphoric acids was demonstrated. It was found that abrasion enhances localised corrosion. The effect of molybdenum, tungsten, and copper content on the behaviour of stainless steels under corrosion-abrasion conditions was also examined. It appears that molybdenum additions have the most beneficial effect on the corrosion-abrasion resistance of stainless steels in phosphoric acids.
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