苯并三氮唑及其甲基衍生物在去离子水中对铜的缓蚀作用

采用电化学和分光光度法研究了苯并三氮唑和甲基苯并三氮唑在去离子水中对紫铜的腐蚀电化学行为的影响和吸附规律。结果表明，当浓度大于5mg/L时，苯并三氮唑和甲基苯并三氮唑均具有较好缓蚀性能，且甲基苯并三氮唑的缓蚀性能优于苯并三氮唑。这两种缓蚀剂属于阳极型缓蚀剂，吸附过程为放热反应，属化学吸附，服从Langmuir吸附等温式。

INHIBITION ACTION OF BENZOTRIAZOLE AND TOLYTRIAZOLE ON CORROSION OF COPPER IN DEIONIZED WATER

Corrosion electrochemistry behavior of benzotriazole (BTA)and tolytriazole (TTA)on copper in deionized water was studied.It was shown that BTA and TTA have good inhibition performance when their concentrations are higher than 5 mg/L.They are anodic type inhibitors,and at the same time they have a little inhibitive effect on the cathodic reaction.With the help of spectrophotometry,the relation of concentration,temperature,time to the inhibiting action of BTA and TTA in deionized water was studied respectively.The adsorption processes are exothermic reactions and belong to chemical adsorptions.The Langmuir isotherm is followed.The free energy,enthalpy and entropy of adsorption,constant of adsorption were calculated.Considering the differences of their molecular structures,the hydrophobic methyl group substitution at the benzene ring gives TTA.The methyl group is not expected to interfere with the bonding characteristics of the triazole ring,as it is far away from the triazole N atoms.The experiments show that the inhibiting action and its persistence of TTA is better than those of BTA under the given conditions.These positive effects can be attributed to the increased film hydrophobicity.