Abstract
The corrosion behaviour of two superferritic stainless steels, both containing varying amounts of ruthenium, was evaluated and compared in a 10% sulphuric acid solution. It was found that small additions of ruthenium increased the corrosion resistance in both types of alloys dramatically. Apart from raising the corrosion potential of the base alloys, the cathodic Tafel slopes were also decreased with an increasing amount of ruthenium in each alloy type. The amount of ruthenium for an optimum increase in the corrosion resistance was found to be 0.16% for both types of alloy.
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