Anodic and Ordinary Corrosion of Ferrous Metals in Various Acids

Abstract

Samples of ordinary, cold‐rolled, low‐carbon steel, 18‐8 chromium nickel steel, 14 per cent chromium iron, silcrome RA metal (Cr 16 per cent, Cu 1.25 per cent, Si 1.25 per cent, low C), duriron (Si 14.5 per cent, C 0.8 per cent, Mn 0.35 per cent), and durichlor (Si 14.5 per cent, Mo 3 per cent) were treated by simple immersion and also anodically with hydrochloric, sulfuric, nitric, and phosphoric acids of different concentrations. These treatments took place both at room temperature and at 60° C. The average loss in weight of each sample per unit of time was determined. In the case of the anodic treatments, the cell voltage was recorded. The numerical data are so arranged that the results obtained under any one set of conditions may be compared readily with those obtained under any other set of conditions. A brief discussion is given of some of the factors which affect the rate of anodic and ordinary corrosion of metals in acids.