铁质文物脱盐过程中的钼酸盐缓蚀作用

采用动电位极化法、电化学阻抗法研究了铁质文物模拟试样在碱性溶液脱盐清洗过程中,钼酸盐缓蚀剂对其电化学行为的影响。通过X射线光电子能谱技术分析了脱盐清洗后试样表面锈层的组成。结果表明,在碱性脱盐溶液中添加钼酸盐缓蚀剂,能减小试样阳极腐蚀电流,增大电极反应阻力,更有效地抑制试样在脱盐过程中的腐蚀。XPS分析结果说明脱盐溶液中添加钼酸盐后,改变了锈层的组成,生成含有Fe2O3、FeMoO4和MoO3的稳定沉积膜,提高了锈层的耐蚀性能,使文物基体在脱盐清洗过程中得到良好的保护。

INHIBITIVE EFFECTS OF MOLYBDENATE ON IRON ARTIFACTS DURING DESALINATION PROCESS

Potentiodynamic polarization and electrochemical impedance spectroscopy(EIS) methods were used to study the effects of molybdenate inhibitor on electrochemical behavior of simulated cast iron artifacts in alkaline desalination solution.The rust composition of the cast iron specimen after desalination was analyzed by X-ray photoelectron spectroscopy(XPS).The molybdenate inhibitor increased the reaction resistance and decreased the anodic current density.The specimen corrosion was restrained effectively during desalination process.The XPS results indicate that the molybdenate transformed the rust composition.A steady deposit film containing Fe2O3,FeMoO4 and MoO3 formed on the surface of the specimen.It increased the corrosion resistance of the rust layer.And the cast iron matrix was protected perfectly during desalination process.