中性和酸性溶液中Q235碳钢表面沉积植酸转化膜的耐蚀行为研究  

Corrosion Inhibition Effect of Phytic Acid Conversion Coating Formed on Q235 Carbon Steel in Acidic and Neutral Solutions

作　　者：郝永胜[1] Luqman Abdullahi SANI 宋立新[1] 徐国宝[2] 葛铁军[1] 方庆红[1] HAO Yongsheng Luqman Abdullahi SANI SONG Lixin XU Guobao GE Tiejun FANG Qinghong(School of Materials Science and Engineering, Shenyang University of Chemical Technology, Shenyang 110142, China Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China)

机构地区：[1]沈阳化工大学材料科学与工程学院,沈阳110142 [2]中国科学院长春应用化学研究所,长春130022

出　　处：《中国腐蚀与防护学报》2016年第6期549-558,共10页Journal of Chinese Society For Corrosion and Protection

基　　金：国家自然科学基金项目(51401132);辽宁省博士启动基金项目(20141080);辽宁省教育厅创新团队项目(LT2015022);辽宁省教育厅一般项目(L2016002)资助

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。The corrosion inhibition effect of phytic acid conversion coatings formed on Q235 car- bon 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 to 96.7%. Though the phytic acid conversion coating adheres to the carbon steel surface through phy- si-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.

关 键 词：Q235碳钢 转化膜 极化曲线 植酸 EIS XPS 

分 类 号：TG174[金属学及工艺—金属表面处理]