A strong cooperative effect of carboxylic acid RCOOX and organic halide (R'X) has been observed in the corrosion of iron and stainless steel at 180 to 210°C. The corrosion gives [FeX(OCOR)]n, whose Mössbauer data are given. Iron and stainless steel strips, except for types 316 (UNS(1) S31600) and 321 (UNS S32100), show 3.4 to 9.8 mg/cm2 weight loss after heating with a mixture of benzoic acid and ethyl bromide for 10 h at 200°C. Types 316 and 321, containing Mo and Ti respectively, show a much slower rate of the corrosion.

Subject
Acids, X-ray diffraction, Corrosion rate, Reaction products, Halides, Iron, Alkyls, Corrosion reactions, Mixtures, Weight loss, Powders, Bromide, Stainless steel
National Association of Corrosion Engineers
1989
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