有机缓蚀剂能在金属表面发生吸附而降低金属的腐蚀速率,但目前对其在金属表面的吸附机理仍不十分清楚.合成了胍基四唑(GT)和1-(对甲基)苯基-5-巯基-1,2,3,4-四氮唑(MMT)2种缓蚀剂,用失重法和电化学法研究了2种缓蚀剂在5%NaHCO_3碱性介质中对铜的缓蚀性能和吸附行为.结果表明:MMT和GT属于阳极型缓蚀剂,对铜均有很好的缓蚀性能,且MMT的缓蚀效率大于GT;MMT和GT均在浓度为50 mg/L时缓蚀效率最大(90%以上);30～60℃时2种缓蚀剂的缓蚀性能随温度的升高而降低;2种缓蚀荆在铜表面的吸附都服从Langmuir吸附等温式,属于物理吸附.
Guanidino tetrazole (GT) and 1 -p-methylphenyl-5 -mereapto- 1,2,3,4-tetrozole (MMT) were synthesized. The inhibition action and adsorption behavior of MMT and GT on copper in aqueons solution of 5 % NaHCO_3 ( mass fraction) were investigated by using weight loss test and electrochemical test. Results indicate that the two types of tetrazole derivative inhibitors have good corrosion inhibition ability for copper in NaHCO_3 solution, and they are both anode-type inhihitors. At the same time, the best inhihition efficiency was obtained for the two types of inhibitors at a concentration of 50 g/L, and MMT had better inhibition ability than GT.Moreover, the inhibition performance of the two types of inhibitors was worsened when temperature increased within a range of 30～60℃. And the adsorption of the inhibitors on copper, as a kind of physical adsorption, followed Langmuir isotherm.
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