The Use of Inhibitors for Aluminum Chemical Equipment

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Abstract
A classification of inhibitors according to their effectiveness and their influence on the intensity and area attacked is given. The electrochemical behavior of inhibitors is discussed and the factors that cause an inhibitor to be safe or dangerous are outlined. A series of laboratory tests to determine the effectiveness of various chemicals as inhibitors of the attack of aluminum and the aluminum‐base alloys in acid, alkaline and neutral solutions are described. Organic substances such as soluble oils, alkaloids and organic sulfur compounds proved to be effective inhibitors in hydrochloric acid. Chromates, soluble oils and commercial wetting agents appeared to be the best in phosphoric acid. No highly effective inhibitors for sulfuric acid were found. In alkaline solutions, the silicates were the most promising inhibitors. Chromates and soluble oils were the most effective inhibitors found for nearly neutral solutions. However, even these substances were not effective for preventing galvanic attack by waters containing appreciable concentrations of chlorides. Service applications of inhibitors for protecting aluminum chemical equipment are described, particular attention being given to the inhibiting action of an alcoholic cooling fluid.

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