AMT在青铜-柠檬酸体系中的缓蚀行为及其机理  

The Inhibition of AMT on Bronze Corrosion in 5％ Citric Acid

作　　者：傅海涛[1] 李瑛[1] 魏无际 朱一帆 

机构地区：[1]中国科学院金属腐蚀与防护研究所金属腐蚀与防护国家重点实验室,沈阳110016 [2]南京化工大学材料科学与工程系,南京210009

出　　处：《物理化学学报》2001年第7期604-608,共5页Acta Physico-Chimica Sinica

基　　金：江苏省自然科学基金(KB97122);金属腐蚀与防护国家重点实验室基金资助项目(1999-05)

摘　　要：用电化学方法、红外反射光谱法研究AMT(2-氨基-5-巯基-1,3,4-噻二唑)在青铜-5％柠檬酸体系中的缓蚀行为和机理.结果表明,AMT能有效抑制青铜在柠檬酸中的腐蚀,属混合型缓蚀剂.红外反射光谱表明,膜的最外层结构为Cu(Ⅰ)AMT,AMT中-NH2参与一价铜的络合反应,环上离氨基最近的N参与配位. 缓蚀机理归因于成相膜的形成.2-amino-5-mercapto-1,3,4-thiadiazole is a new inhibitor to resist the corrosion of copper and its alloys.The corrosion behavior of bronze in the presence of AMT has been investigated in 5％citric acid.Electrochemical potentiostatic polarization method and electrochemical impedance spectroscopy (EIS) were applied to analysis the effect of the organic compound on the corrosion inhibition of bronze.The results showed that AMT could greatly retard the corrosion of bronze in citric acid,which was attributed mainly to the protective film formed by AMT.Fourier transform infrared (FTIR) was used to characterize the surface film.A polymeric Cu(Ⅰ)-inhibitor complex exhibiting strong corrosion inhibition that totally covered the bronze surface was identified.AMT behaves as bidentate ligand through the aminic nitrogen atom and the closed ring nitrogen in these complexes.

关 键 词：2-氨基-5-巯基-1 3 4-噻二唑 文物保护 缓蚀机理 青铜 柠檬酸 缓蚀剂 红外光谱 缓蚀行为 

分 类 号：TG174.42[金属学及工艺—金属表面处理] G264[金属学及工艺—金属学]