Inhibition of low-alloy steel corrosion with a composite pigment based on zeolite and monocalcium phosphate

Keywords

corrosion, steel, anti-corrosion pigment, zeolite, monocalcium phosphate, potentiodynamic polarization, electrochemical impedance spectroscopy, scanning electron microscopy, X-ray diffraction studies.

Cite as

Korniy S. А., Zin I. М., Danyliak M.-O. М., Khlopyk O. P., and Datsko B. M. Inhibition of low-alloy steel corrosion with a composite pigment based on zeolite and monocalcium phosphate. Physico­chemical Mechanics of Materials. 2022. 58(2), 109-115.

Abstract

The protective properties of composite anti-corrosion pigment based on synthetic zeolite and monocalcium phosphate obtained by mechanochemical synthesis on the surface of low-alloy 09G2S steel carbon was studied. It was shown that after mechanical dispersion of the pigment in a ball mill for 1 h at a rotation speed of the grinding cylinder 200 rpm, the crystal structure of zeolite was preserved with partial formation of an amorphous com­ponent. Based on X-ray diffraction studies, it was suggested that during synthesis phos­pha­tes are intercalated into nanopores of zeolite. The corrosion resistance of 09G2S steel in 0.1% NaCl solution and in extracts of synthesized zeolites of different composition was investigated by the methods of potentiodynamic polarization and impedance spectroscopy. It was shown that the synthesized pigment had an inhibitory effect on the corrosion of this steel, and its anti-corrosion efficiency was maximum at a mass ratio of zeolite and phos­phate components 1 to 3. The formation of a protective film on the steel surface after exposure in inhibited media was revealed by electron microscopy. The morphology and composi­tion of the film depended on the ratio of its components and which consisted of insoluble phosphates of calcium and iron.

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