A study of tetrazoles derivatives as corrosion inhibitors of copper in nitric acid

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.

Synthesis, Crystal Structure and IR Spectrum studies of 2-(4-Methyl-2-phenyl-4,5-dihydro-oxazol-4-ylmethyl)- isoindole-1,3-dione

“…The corrosion inhibitors of mild steel are generally heterocyclic compounds containing nitrogen. Moreover, many N-heterocyclic compounds have been proved to be among the best known and the most studied inhibitors [16][17][18][19][20][21][22][23][24][25][26] . Moreover, isoindole-1,3-dione systems represent a talented group of bioactive compounds [27][28][29] .…”

On the corrosion inhibition and adsorption behaviour of some benzotriazole derivatives during copper corrosion in nitric acid solutions: a combined experimental and theoretical study

“…Several heterocyclic nitrogen containing compounds were used as corrosion inhibitors for copper in acidic media [4][5][6][7][8][9][10][11]. It reveals that most of these inhibitors were aromatic and heterocyclic compounds containing nitrogen.…”

Inclusion of 5-Mercapto-1-Phenyl-Tetrazole into β-Cyclodextrin for Entrapment in Silane Coatings: An Improvement in Bronze Corrosion Protection

“…In this research, the effective formation and the stability of a complex between β-CD and 5-mercapto-1-phenyl-tetrazole (MPT) ( Figure 1) were assessed. Among non-toxic corrosion inhibitors [24][25][26], MPT was chosen because of its outstanding inhibiting properties towards copper and bronze corrosion [27][28][29]. Its complex with β-CD was incorporated in a 3-mercapto-propyltrimethoxy-silane (PropS-SH) coating, and the protectiveness of the obtained coating was assessed on bronze during both immersions in concentrated acid rain and exposures to alternated acid rain spray.…”