Passivation of mild steel by sodium octylphosphonate in neutral aqueous solution

• Yu.I. Kuznetsov, A.A. Chirkunov, A.S. Gorbachev and N.P. Andreeva

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

Abstract: The effect of temperature, pH and exposure time on the passivating properties of sodium octylphosphonate (OP) have been investigated. It has been shown that passivation of steel in the presence of OP may occur without the formation of a surface oxide. It has been established by ellipsometry that adsorption of OP is described by a Frumkin isotherm both for oxidized and reduced steel surface, and that it is better adsorbed on reduced surface.

Keywords: passivation, adsorption, corrosion inhibitor, octylphosphonic acid

Int. J. Corros. Scale Inhib., 2017, 6, no. 3, 318-332 PDF (382 K)
doi: 10.17675/2305-6894-2017-6-3-7

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