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

J Chin Soc Corr Pro

2002, Vol. 22

Issue (6): 359-362 DOI:

Research Report

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

Dongmei Liao;Ping Yu;Yunbai Luo

武汉大学化学与分子科学学院

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Dongmei Liao; Ping Yu; Yunbai Luo. INHIBITION ACTION OF BENZOTRIAZOLE AND TOLYTRIAZOLE ON CORROSION OF COPPER IN DEIONIZED WATER. J Chin Soc Corr Pro, 2002, 22(6): 359-362 .

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Abstract Corrosion electrochemistry behavior of benzotriazol e (BTA)and tolytriazole (TTA)on copper in deionized water was studied.It was sh own that BTA and TTA have good inhibition performance when t heir concentrations are higher than 5 mg/L.They are anodic type inhibitors,and a t the same time they have a little inhibitive effect on the cathodic reaction.Wi th the help of spectrophotometry,the relation of concentration,temperature,time to the inhibiting action of BTA and TTA in deionized water was studied respectiv ely.The adsorption processes are exothermic reactions and belong to chemical ads orptions.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 bo nding 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 TT A is better than those of BTA under the given conditions.These positive effects can be attributed to the increased film hydrophobicity.

Key words: benzotriazole tolytriazole inhibitor isotherm

Received: 29 June 2001

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