Inhibition of magnesium corrosion by triazoles

• Yu.I. Kuznetsov, A.M. Semiletov and A.A. Chirkunov

A. N. Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Leninskii pr. 31, Moscow, 119071 Russian Federation

Abstract: The inhibitive action of some azoles (1,2,4-triazole, 1,2,3-benzotriazole, 5-chlorobenzotriazole, and IFKhAN-92 corrosion inhibitor) on the corrosion of magnesium was investigated in aqueous buffer solutions and humid atmosphere. Increasing the hydrophobicity and decreasing the pKa of NH-acids enhance the protection of Mg by triazoles, that is why 5-chlorobenzotriazole and IFKhAN-92 – a mixture of substituted triazoles – are more efficient inhibitors. Small additions of dioctylphosphate increase the protection of Mg in aqueous solution by IFKhAN-92 inhibitor, and addition of trialkoxysilane to the mixed inhibitor allows one to enhance the protection of Mg in a humid atmosphere.

Keywords: magnesium, corrosion, corrosion inhibitors, triazoles

Int. J. Corros. Scale Inhib., 2016, 5, no. 1, 31–49 PDF (806 K)
doi: 10.17675/2305-6894-2016-5-1-3

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