新型复合缓蚀剂对青铜文物的防腐蚀研究

Hybrid Corrosion Inhibitor for Anti-corrosion and Protection of Bronze Relics

为评价苯骈三氮唑(BTA)和甲酸钠(SFA)复合缓蚀剂对青铜文物的防腐保护能力,利用电化学方法研究了复合缓蚀剂对青铜试样在3%(质量分数) NaCl溶液中电化学行为的影响,并通过X射线光电子能谱技术(XPS)分析了复合缓蚀剂对青铜表面膜成分的影响。结果表明,SFA的加入增强了BTA对青铜的腐蚀抑制作用,提高了青铜表面膜电阻和电极反应的界面电荷转移电阻。XPS分析结果表明,青铜表面氧化物种类对CuBTA配合物的形成影响较大,在SFA存在条件下,青铜表面物种以Cu_(2)O为主,更有利于BTA吸附,生成Cu (I)-BTA聚合物保护膜,从而提高青铜的抗腐蚀能力。本研究结果为青铜文物抗腐蚀处理提供了理论依据和有效的方法。

The effect of a hybrid corrosion inhibitor, namely mixtures of benzotriazole(BTA) and sodium formate(SFA), on the corrosion behavior of bronze in 3%(mass fraction) NaCl solution was assessed by means of CHI760 E electrochemical workstation and X-ray photoelectron spectroscopy(XPS) technique. The results demonstrated a satisfied anti-corrosion enhancement effect of SFA, indicated by increased film resistance and interfacial electron-transfer resistance on bronze surface measured by electrochemical impedance spectroscopy. The XPS analysis indicated a major impact of the type of the formed oxides on bronze surface to the formation of Cu-BTA complex. And in the presence of SFA, the corrosion product on bronze surface is dominated by Cu_(2)O, which is more conductive to the adsorption of BTA and the formation of Cu(I)-BTA complex, thereby improving the corrosion resistance of bronze. This study not only provides a deeper insight into the theoretical basis for the anti-corrosion of bronze, but also suggests an effective approach to protect bronze cultural relics as well.