Sodium dihydrogen phosphate can inhibit corrosion in aluminum alloy

Sodium phosphate and sodium dihydrogen phosphate increase the inhibition efficiency with increasing concentration in the lower concentration range, and the inhibition efficiency is not high at higher concentrations. The inhibition efficiency of disodium hydrogen phosphate increases with increasing concentration. The corrosion inhibition effect of phosphate on aluminum alloy in sodium chloride solution is mainly achieved by pH effect and promotion of passivation of aluminum alloy and formation of insoluble precipitated film on the surface of aluminum alloy. Phosphate inhibits the ability of the aluminum alloy to resist pitting to some extent.

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