Влиянии электромагнитного поля, генерируемого Резонансно-Волновым Комплексом, на коррозию низкоуглеродистой стали в водных средах

Abstract

The aim of this work is to investigate the influence of the electromagnetic field generated by the emitter of resonance-wave complex on corrosion of structural carbon steel 20, used in the manufacturing of oilfield equipment. The effect of electromagnetic field on the corrosion of structural low carbon steel 20 in 3% sodium chloride aqueous solution in conditions of carbon dioxide corrosion. Influence of resonance-wave complex electromagnetic field on the corrosion of steel 20 was evaluated by gravimetric method according to GOST R 9.905-2007. It is shown that the use of resonance-wave complex can provide protection of steel 20 against corrosion in carbonate mineralized water. The obtained results showed that the generated electromagnetic field causes an increase of the steel 20 corrosion rate 1.13 times in 3% NaCl aqueous solution in the presence of CO2. The 3% aqueous NaCl, containing 0.19% CaCl2, contrary, the steel 20 corrosion rate decreases under the influence of the electromagnetic field, despite the higher concentration of Cl- ions. Probably, in the presence of CO2 and Ca2+ ions calcium carbonate formation occurs at a specific pH level in the surface layer of the solution. Adhesion of calcium carbonate on the surface of the steel sample prevents the corrosion process. The research results concerning the influence of the magnetic field on the corrosion of stainless steel and iron in nitric and hydrochloric acids have shown that the rate of localized corrosion depends on the direction of the applied magnetic field. The data of the electromagnetic fields influence on the pH level of the aqueous solution of sodium chloride show that the environment acidity decreases rapidly under the influence of resonance-wave complex electromagnetic field, which confirms the assumption of the protective effect of CaCO3 on the metal surface.