摘要
通过极化曲线法、失重法和气体加速腐蚀法研究了咪唑(IA)、苯并咪唑(BIA)、巯基苯并四氮唑(PMTA)、苯并三氮唑(BTA)、巯基苯并噻唑(MBT)等五种缓蚀剂对青铜的缓蚀作用.实验发现,MBT的效果最好.在50℃、3.5%NaCl溶液加速腐蚀条件下,在缓蚀剂浓度为10-2mol·L-1时,MBT的缓蚀效率为99.1%,而BTA的缓蚀效率为92.4%.经MBT处理后的青铜样块,色泽无明显变化,且有一定的耐酸碱能力.复合缓蚀剂[(MBT+BTA)或(MBT+PMTA)]在低浓度时比单一缓蚀剂的效果好.红外光谱表明,铜与杂环上有孤对电子的硫、巯基上的硫及氮配位.铜与MBT可能形成面型配合物膜,其成膜速度及覆盖度均较BTA为大.
The inhibition efficiency of various corrosion inhibitors,imidazole (IA),benzoimidazole (BIA), 1-phenyl-5-mercapto-tetrazole (PMTA), benzotriazole (BTA) and 2-mercapto-benzothiazole (MBT) etc,for bronze have been investigated by means of polarzation curve method,weightloss test and corrosion acceleration method with SO2. The results show that in relatively low concentration (10-2 mol·L-1),the inhibition efficiency of MBT is the best,about 99.1 %,that of BTA is only 92. 4%. The mixture of MBT and BTA or of MBT and PMTA has synergistic effect. IR spectra indicate that copper may be coordinate with N,S atoms having lone pair electrons in heterocycle and mercapto of MBT. Copper and MBT may form a two dimensions coordinate compound film. The forming film rate and coverage of MBT in bronze surface is better than that of BTA.
出处
《复旦学报(自然科学版)》
CAS
CSCD
北大核心
1996年第3期295-304,共10页
Journal of Fudan University:Natural Science