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:通过按正交法设计的紫外光照曝露等加速大气腐蚀实验 ,研究了用于防止银变色的唑系复合缓蚀剂成膜处理的工艺 ,并评定其对模拟文物银试片的防变色性能。采用极化曲线和交流阻抗Nyquist图 ,讨论了防变色作用的电化学机理。实验结果表明 ,缓蚀剂 PMTA、MBI和 MBO具有较好的协同作用 ,银试片在 5 0°C、p H 3.0、组分 MBO∶ PMTA∶ MBI为 1∶ 1 .7∶ 3(摩尔比 )、复合缓蚀剂浓度为 0 .0 1 89mol/L的溶液中 4h成膜处理后 ,经 48h硫华气氛和 36h紫外光曝露腐蚀实验 ,无色斑出现 ,表明缓蚀膜明显地提高了银试片的抗变色能力
: Accelerated atmospheric corrosion experiments by UV exposure designed by orthogonal method were used to study the film-forming process of azole-based composite corrosion inhibitor for preventing discoloration of silver, and the anti-discoloration performance of simulated silver artifacts was evaluated . Using polarization curves and Nyquist plots of AC impedance, the electrochemical mechanism of discoloration prevention is discussed. The experimental results show that the corrosion inhibitors PMTA, MBI and MBO have good synergistic effect. The silver test piece has a good thermal stability at 50 ° C, p H 3.0 and a component MBO: PMTA: MBI of 1: 1 .7: 3 ), The composite corrosion inhibitor concentration of 0.0199mol / L solution 4h after filming treatment, after 48h sulfur atmosphere and 36h UV exposure corrosion experiments, no stain appears, indicating that the corrosion film significantly increased Anti-discoloration ability of silver test piece