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Corrosion behaviour of superferritic stainless steels cathodically modified with minor additions of ruthenium in sulphuric and hydrochloric acids

The work describes an investigation on the corrosion resistance of superferritic stainless steels in various reducing acid solutions. Stainless steels are usually very corrosion resistant in oxidising media, but corrode seriously in reducing acid media. This work elaborated on early demonstrations of the beneficial effect of small PGM additions, in this case Ru, to increase the corrosion resistance of a new class of stainless steels, i.e. superferritics, in reducing acid media. The successful outcome of this work increased the application possibilities of superferritic stainless steels under various aggressive process conditions where they could not previously be considered.