Erosion Corrosion of Carbon Steel in Aqueous Slurries

Erosion corrosion of an usual carbon steel in a variety of aqueous slurries of 10% Al2O3 powder composed of 0.1M NaOH, concentrated cooling water (synthetic rather than natural), 3% NaCl, and 0.01M HCl was investigated from the electrochemical point of view. The total weight loss, Wt, was experimentally divided into the following three terms: the mechanical loss, Wm, the corrosion loss, Wc, and the loss due to erosion corrosion, Wec. Wm was measured under catholic polarization whereby no corrosion occurred. On the other hand, Wc was obtained in the respective solutions free of alumina powder. Therefore, Wec was evaluated as the difference between Wt and the sum of Wm and Wc. Of these, Wm was relatively small compared to other factors under the experimental conditions employed. The weight loss due to corrosion associating with erosion, i.e., Wc+Wec, was discussed from the electrochemical concept. (Received Jan. 9, 1983) キー ・ワー ド: 摩耗腐食, 炭素鋼