关键词: 彩色水性铝颜料, 包覆机理, 氧化铁, 耐腐蚀性

Abstract: The khaki waterborne aluminum pigments were prepared in isopropyl alcohol/water media at 6-6.5 pH value,using ferrous sulfate as precursor and H₂O₂ as anchoring agent.The encapsulated mechanism and the effect of temperature on the aluminum property were discussed.Scanning electron microscopy,optical microscopy,X-ray diffraction and infrared spectroscopy results show that the diaspore form on the aluminum flakes surface by H₂O₂ oxidizing,and the amorphous iron oxide particles with opposite charge can combine with diaspore by mutual attraction.Perhaps the diaspore induces the iron oxide in the solution to form goethite anchored on the aluminum surface and then form a dense coating layer.At low temperature,the electrostatic attraction of amorphous iron oxide dominates.As the temperature rising,the proportion of goethite is increased,and the crystallinity is enhanced.The performance test prove that goethite and amorphous iron oxide evenly deposits on the aluminum surface together to form a dense coating layer at 45 ℃,and thus gives the khaki aluminum pigments excellent corrosion resistance performance.

Key words: colored waterborne aluminum pigments, encapsulation mechanism, iron oxides, corrosion resistance