Author:
Mihit M.,Salghi R.,El Issami S.,Bazzi L.,Hammouti B.,Ait Addi El.,Kertit S.
Abstract
PurposeTo evaluate the effect of some tetrazole compounds as corrosion inhibitors of copper in HNO3 at various temperatures.Design/methodology/approach1‐phenyl‐5‐mercapto‐1,2,3,4‐tetrazole (PMT) was selected as the best inhibitor among the tetrazole compounds tested. Gravimetric and electrochemical techniques were conducted.FindingsPMT was an excellent inhibitor for copper in acid. Its efficiency attained 97.5 per cent and decreased slightly with temperature.Research limitations/implicationsThe inhibition efficiency increased with the concentration of PMT to reach 97.5 per cent at 10−3 M. Good agreement between the various methods explored was observed. Polarisation measurements also showed that PMT acted as a mixed inhibitor.Practical implicationsThe efficiency of PMT increased with the concentration but decreased with rise of temperature in the 298‐333 K range. As such, PMT could be used in chemical cleaning and pickling processes.Originality/valueThe originality of this work was the finding of an efficient inhibitor (PMT) having a nearly 100 per cent efficiency.
Subject
Materials Chemistry,Surfaces, Coatings and Films
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