Abstract
Abstract Nitrites have been reported to synergize well with organic phosphates (phosphonates and amino phosphonates) and inhibitor blends based on these two compounds have been successfully used for cooling water systems. The use of inorganic phosphates alone or in combination with chromate, zinc or both as inhibitors for cooling water is also well established. The synergism of nitrites with inorganic phosphates, however, is not reported in the literature. A synergistic multi-component inhibitor formulation containing low levels of sodium nitrite and inorganic phosphates (added as a 1:1 ratio of orthophosphoric acid and sodium hexametaphosphate) was developed and is effective in protecting carbon steel in tap water. Electrochemical studies indicate that the behavior is similar to that of an anodic inhibitor.
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