A study on the desorption of phosphonic acids, corrosion inhibitor precursors, from polymer microcapsules

• V.A.Golovin¹, A.B. Ilyin¹, A.D. Aliev¹, V.A. Shchelkov¹ and V.A. Rabinkov²

¹ A. N. Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Leninskii pr. 31, Moscow, 119071 Russian Federation
² National Research Moscow State University of Civil Engineering (NRU MGSU), Yaroslavskoye shosse 26, Moscow, 129337 Russian Federation

Abstract: Salts of phosphonic acids are known as efficient corrosion inhibitors in anticorrosive coatings. Incorporation of phosphonates in microscopic capsules into a coating makes it possible to initiate desorption from capsules and diffusion of the inhibitor to the substrate “on demand”. The desorption kinetics of phosphonic acids at the initial stage of contact of a capsule with a water flow and until establishment of a stable inhibitor flux has been studied. The diffusion coefficients of the acid extracted from capsules have been estimated. The efficiency of granulation and extraction processes for building microcapsule walls resistant to water and organic solvents has been shown.

Keywords: coating, microcapsule, inhibitor, phosphonic acid, desorption, diffusion, corrosion

Int. J. Corros. Scale Inhib., 2018, 7, no. 2, 165-174 PDF (684 K)
doi: 10.17675/2305-6894-2018-7-2-4

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