Corrosion rate data are presented for low carbon steel in (1) a combination of sulfur dioxide, water vapor and air, and (2) aqueous solutions of sulfurous acid in the absence of air, at ordinary temperature. Information as to the nature of the corrosion products is presented and it is shown that this depends on the place in which the corrosion takes place to an important extent.

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Mild steel in contact with an aqueous solution of sulfurous acid can be protected from corrosion by the use of an inhibitor consisting of ammonium oxalate and hexamine. The experimental results leading to this discovery are described In this article

It has been found here that the corrosion rate of a metal in an acid such as H2S03, HN03, H2S04, or HCI, having a normality between N/1 and N/10,000, is related to the concentration of the acid in accordance with the equation Corrosion rate = a x ( Acid Normality) b where a and b are constant for each combination of acid and metal and where the temperature is 25 °C. Having determined the values of a and b for a considerable number of these acid-metal combinations, it was possible 1-to compare the corrosion rates of the various metals in sulfurous acid with those of the same metals in the well-known nitric, sulfuric, and hydrochloric acids, and 2- to determine the corrosion rates of the metals in sulfurous acid of different normalities