Synthesis of aluminum tri-polyphosphate anticorrosion pigment from bauxite tailings
Aluminum tri-polyphosphate was synthesized from bauxite tailings and phosphoric acid with a P/Al molar ratio of 3.This is highly advantageous from a waste recycling perspective as bauxite tailings are generally regarded as unusable waste.The acidity,whiteness and mean particle size of prepared aluminum tri-polyphosphate are all improved after modification.The possibility of using modified aluminum tri-polyphosphate as an anticorrosive pigment was also investigated by electrochemical impedance spectroscopy.The resistance of the coatings with modified aluminum tri-polyphosphate is 7× 107Ω for 40 d of immersion,which is superior or at least comparable to that of coatings containing APW-2,which exhibits a resistance of 5.7× 107 Ω.
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