摘要
合成了5-苯基-2-氨基-1,3,4-噻二唑(PATD)和2,5-二苯基-1,3,4-噻二唑(DPTD)两种噻二唑衍生物。通过电化学技术研究了这两种物质在50mg/L S-乙醇溶液中对银电极的影响。结果表明这两种油溶性化合物对银产生明显的缓蚀作用,PATD和DPTD的缓蚀效率分别为93.0%和90.8%。采用金相显微镜和表面接触角观察了银片在未添加和添加缓蚀剂的溶液中腐蚀前后的表面形貌。结果表明:通过金相显微镜可以看到,两种缓蚀剂在银片表面形成了保护膜,有效地抑制了银片的腐蚀;PATD和DPTD在银片表面的接触角分别为84.2°和100°,接触角明显增大,也说明缓蚀剂吸附到了金属的表面,形成了疏水膜。两种缓蚀剂吸附到银表面遵循Langmuir吸附等温方程,计算得PATD和DPTD的ΔG0ad分别为-34.3kJ/mol和-36.7kJ/mol,吸附属于以化学吸附为主的混合型吸附。
Thiadiazole derivatives were prepared, namely 2,5-diphenyl-1,3,4 -thiadiazole （DPTD） and 5-phen- yl-2-amino-1,3,4-thiadiazole （PATE））. The corrosion electrochemical behavior of silver was studied by Tafel polariza- tion curves to investigate the inhibitive effect of the thiadiazole derivatives in ethanol solutions containing 50 mg/L sub fur. The results showed that they had well corrosion inhibition, and the percentage inhibition efficiency of PATD and DPTD was 93.0° and 90. 8°, respectively. Surface analysis was carried by metallographic microscopy and connect angle to research the silver surface before and after immersing in inhibitor solution. The result of metallographic mi- croscopy indicated that the thiadiazole derivatives adsorbed onto silver surface and successively inhibited silver corro- sion. The connect angle of PATD and DPTD was 84. 2° and 100°, respectively. The connect angle increase with adding inhibitor, due to thiadiazole derivatives adsorbed onto silver surface and formed hydrophobic coating. The ad- sorption of PATD and DPTD follows Langrnuir adsorption isotherm. The calculated values of ΔGad0 of PATD and DPTD were --34. 3 kJ/mol and --36.7 kJ/mol. The adsorption belongs to mix-type adsorption mainly dominated by ehemisorption.
出处
《材料导报》
EI
CAS
CSCD
北大核心
2014年第12期78-81,共4页
Materials Reports
基金
国家自然科学基金(21176030)
辽宁省高等学校优秀人才支持计划(LN2011033)
关键词
噻二唑衍生物
接触角
金相
LANGMUIR吸附
thiadiazole derivatives, connect angle, metallographic microscopy, Langmuir adsorption
