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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Fe_2O_3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。
Phytic acid conversion coatings were prepared in neutral and acidic phytic acid solutions and their corrosion resistance was studied. The results showed that the phytic acid conversion coating obtained in neutral phytic acid solution had better corrosion resistance than the phytic acid conversion coating obtained in acid solution, especially in 0.06 mol / L phytic acid solution with pH value of 7.0 The phytic acid conversion coating obtained after reaction for 1 h can reach 96.7% efficiency. Although phytic acid conversion coating and Q235 carbon steel electrode surface by physical adsorption combined, but it still has excellent interfacial adhesion. XPS results show that phytic acid has the function of passivating the surface of carbon steel, and finally the phytic acid conversion coating obtained on the surface of carbon steel is actually a composite film consisting of phytic acid conversion film and Fe 2 O 3 passivation film on the surface of carbon steel , Both through the collaborative inhibition to protect the carbon steel electrodes from corrosive media erosion.