Inhibitors for long-term protection

Inhibitors for long-term protec­tion are substances with low water solubility. The commer­cially available products are either used as a replacement for traditional anticorrosive pig­ments as the sole inhibitor or in combination with pigments to synergistically enhance anodic pro­tection. Their use in coatings is expected to increase with rapid development of waterbased anticorrosive paints, in which some of the traditional anticorrosive pigments have limitations of com­patibility and lower efficiency. Their usage level is higher than that of flash-rust inhibitors but markedly lower than anticorrosive pigments.

Typical examples of commercially used inhibitors are amine/zirco- nium complexes of toluylpropionic acid, zinc salts of 5-nitroisophtha — lic acid, zinc salts of cyanuric acid, zinc and magnesium salts of dodecylnaphthalenesulfonic acid and 2-mercaptobenzothiazolyl — succinic acid (Figure 5.24), and metal salts of aminocarboxylates.

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