Abstract
The corrosion of stainless steel in mixtures of nitric and hydrofluoric acids is markedly increased by the addition of eitber hydroxylamine nitrate or sulfamic acid, but not by the addition of ascorbic acid. Silver, Hastelloy C, and Monel corroded at rates less than five mils per year in a nitric acid-- hydrofluoric acid solution containing hydroxylamine nitrate, sulfamic acid, and ascorbic acid. Hastelloy B, Haynes 25, Carpenter 20, and Nionel corroded at rates up to 25 mils per year. Corrosion rates of about 25 mils per year were considered acceptable for this application. The corrosion of Type 304L or Type 309Cb stainless steel in a solution of nitric and hydrofluoric acids conthining a reducing agent was decreased to less than 20 mils per year by the addition of either aluminum or silver ions. Very small concentrations of either cupric or ferric ions lowered the corrosion rale of 309Cb stainless to less than five mils per year in the same solution. (auth)
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