Corrosion Inhibition of Low-Alloy Steel by a Composite Pigment Based on Zeolite and Monocalcium Phosphate.

We study the protective properties of a composite anticorrosion pigment based on synthetic zeolite and monocalcium phosphate and obtained by the method of mechanochemical synthesis on the surface of 09G2S low-alloy carbon steel. It is shown that, as a result of mechanical dispersion of the pigment in a ball mill for 1 h with a rotational speed of the milling cylinder equal to 200 rpm, the crystal structure of zeolite is preserved with partial formation of the amorphous component. On the basis of the results of X-ray phase diffraction analyses, it is suggested that, in the course of synthesis, phosphates are intercalated into the nanopores of zeolite. The corrosion resistance of 09G2S steel in a 0.1% NaCl solution and in the extracts of synthesized zeolites with different compositions was investigated by the methods of potentiodynamic polarization and impedance spectroscopy. It is shown that the synthesized pigment exerts an inhibitory effect on the corrosion of steel, and its anticorrosion efficiency is maximum if the mass ratio of zeolite and phosphate components is equal to 1 : 3. The formation of protective film on the steel surface after holding in inhibited media is discovered by the method of electron microscopy. The morphology and composition of the film formed by weakly soluble calcium and iron phosphates depend on the ratio of components of the pigment. [ABSTRACT FROM AUTHOR]

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