Abstract
The evaluation of the effectiveness of various inhibitors on the corrosion of steel in boiling solutions of potassium carbonate saturated with carbon dioxide and hydrogen sulfide is cited. The corrosion of carbon steel in a carbonate solution saturated with carbon dioxide can be eliminated with a 0.2 percent concentration of either potassium chromate or sodium metavanadate. In solutions of carbonate saturated with carbon dioxide and hydrogen sulfide no corrosion is obtained with 0.2 percent sodium metavanadate or 0.15 percent vanadium pentoxide. The alkaline-sulfide mixture destroys oxidizing inhibitors such as potassium chroma te. N-alkyl trimethylene diamines at a concentration of 0.1 percent reduce the corrosion rate to about 5 mpy. Sodium metasilicate, at a concentration of 0.6 percent, completely inhibits the corrosion, but deposits free silica in the system. Commercially available cladding materials such as the epoxy-coatings also prevent corrosion.
5.8.2, 6.2.3