Binary Projectile Corrosion Problem -Corrosion and Corrosion Inhibition of Metals in Hydrofluoric Acid Solution.

摘要

Corrosion inhibition studies were conducted in relation to a problem encountered with a binary projectile system. It was found that corrosion of steel in dilute (0.59 N) hydrofluoric acid solution was greatly retarded by the addition of small amounts of As2O3, o-tolylthiourea (OTTU), benzotriazole (BT), gelatine (GEL), quinoline ethiodide (QEI), or n-laurylpyridinium chloride (NLPC). The combination of OTTU-BT provided quite effective inhibition with little tendency for pitting corrosion. The addition of inhibitor to hydrofluoric acid solution resulted in an increase in the corrosion potential of steel indicative of predominant inhibition of the anodic reaction; the highest potential was obtained with OTTU addition. The ability for various metals to resist hydrofluoric acid attack was determined in order to arrive at potential coating systems for steel or alternate membrane materials. Corrosion inhibitors in the actual corrosive agent of the binary projectile were relatively ineffective for reducing corrosion rates of steel.