【摘要】 分别在中性和酸性植酸溶液中制备植酸转化膜并研究其耐蚀性。结果表明,在中性植酸溶液中得到的植酸转化膜的耐蚀性优于在酸性溶液中得到的植酸转化膜,特别是在0.06 mol/L、pH值为7.0的植酸溶液中反应1 h所得到的植酸转化膜的保护效率可达到96.7%。虽然植酸转化膜与Q235碳钢电极表面通过物理吸附相结合,但是其仍然具有优良的界面结合力。XPS结果表明,植酸具有钝化碳钢表面的功能,且最终在碳钢表面得到的植酸转化膜实际上是一层由植酸转化膜和碳钢表面的Fe₂O₃钝化膜构成的复合膜,二者通过协同抑制作用来保护碳钢电极不受外界腐蚀介质的侵蚀。更多还原

【Abstract】 The corrosion inhibition effect of phytic acid conversion coatings formed on Q235 carbon steel was evaluated by potentiodynamic polarization curves and electrochemistry impedance spectroscopy. The phytic acid conversion coating on carbon steel surface prepared in 0.06 mol/L pH 7.0 phytic acid solution for 1 h has the best inhibition effect with inhibition efficiency up to96.7%. Though the phytic acid conversion coating adheres to the carbon steel surface through physi-sorption, the coating possesses fairly well adhesiveness to the substrate. SEM and XPS results show the prepared coating on carbon steel surface is a composite coating of phytic acid conversion coating and Fe₂O₃ passivation film, while the two components have synergistic effect.更多还原