Pyrazole derivatives efficient organic inhibitors for corrosion in aggressive media: A comprehensive review

• I. Merimi, R. Touzani, A. Aouniti, A. Chetouani and B. Hammouti

University Mohamed Premier, Faculty of Sciences, Department of Chemistry, Laboratory of Applied and Environmental Chemistry, BV Mohammed VI, BP 524, 60000 Oujda, Morocco

Abstract: The high cost of corrosion estimated by billions of dollars per a year for industries. The research of new inhibitors to stop the increase of this phenomenon is more appreciate and tolerated during metallic materials use by human kind. Research of organic as well as mineral inhibitors increases more and more to stop or retard destruction of metals in aggressive media. Since 1995, our laboratory research had given an important thinking to solve this problem by using various techniques as weight loss, potentiodynamic and polarization resistance measurements. The focus was in using an organic inhibitor containing heteroatoms such as azoles derivatives, pyrazine; thiophene as well as extracts or oil of natural plants, etc. In this review, we report our contribution to this field by using pyrazole and bipyrazole derivatives as efficient and good inhibitors against corrosion in acidic media. Inhibitory effect depends on the constituent groups, metallic materials, corrosive medium. Pyrazole and bipyrazole compounds adsorb on the metallic surface according to physical and/or chemical process, and can also form organic-metal ion complexes. Marvinsketch.18 program was used in order to detect predominant form of inhibitors in electrolytic solution and then computed by Gaussian 09 based on the DFT method at B3LYP/6-31G(d,p) to correlate results obtained theoretically with those obtained experimentally.

Int. J. Corros. Scale Inhib., 2020, 9, no. 4, 1237-1260 PDF (666 K)
doi: 10.17675/2305-6894-2020-9-4-4

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