Abstract
The correlation between concentration of moisture in petroleum white products and corrosion rate in an atmosphere of air, O 2, N 2 and H 2 with and without the presence of inhibitors and drag reducers has been investigated by internal pits propagation on a closed pipeline system and metal cylinders. The carbon and Cr, Ni steels used for construction of pipelines and storage vessels have been investigated. It was shown that partial pressure of O 2 does not affect the corrosion rate at the same concentration of moisture. The rate of corrosion in an atmosphere of N 2 and H 2 decreases at a constant concentration of moisture, but this effect is relatively small when compared to the increase of metal dissolution and increasing concentration of moisture. The addition of the hydrophilic and hydrophobic drag reducers and inhibitors affects the corrosion rate. This effect is higher in presence of hydrophylic inhibitors than in presence of hydrophylic drag reducers. Based on the experimental data, the corrosion mechanisms in petroleum white products have been interpreted by a charge transfer mechanism of the metal oxidation by absorbed water molecules, and a protonation of petroleum products. Postulated and observed rates of reaction, based on oxidation by H 2O molecules, are in a very high correlation.
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