Abstract
The influence of sodium polyphosphate on the corrosion of mild steel in solution of sodium chloride having the same concentration as sea water has been studied by polarization and potential measurements. It has been shown that the corrosion of mild steel can be effectively reduced by the addition of small amounts of polyphosphates in the presence of divalent cations such as Ca, Mg, Zn and dissolved oxygen. A thin transparent film of amorphous structure was found to be deposited on the surface of metal treated with the solution containing polyphosphate and calcium ions. The mechanism of inhibition by polyphosphates in the presence of calcium and magnesium can be explained by formation of a glass-like film deposited on cathodic areas which increases cathodic polarization. In the presence of oxygen, polyphosphates favour the process of passivation.
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