The effect of cyclic potential pulse on corrosion and hydrogenation of carbon steel in chloride solutions with a pH close to neutral
https://doi.org/10.61852/2949-3412-2024-2-3-111-130
Abstract
At more negative Еc values, an increase in the duration of cathodic polarization reduces the intensity of steel local corrosion in the unbuffered chloride solution. This effect is explained by blocking of the pit nucleation centers on the metal surface by a layer of steel dissolution products formed in the near-electrode electrolyte layer with a high pH. Significant fluctuations in the cathodic protection potential under the influence of stray currents lead to the formation of local types of corrosion of steel structures operating in soils and seawater. The potential fluctuations induced by both alternating and direct current sources can be modeled by cycling a square potential stage. In this paper, the effect of cyclic potential pulse (CIP) on the general and local corrosion of low-carbon steel in 3.5% NaCl solution with borate buffer (pH 6.7) and without it is studied. A decrease in the cathodic half-period potential (Ec) of the CIP inhibits general corrosion and accelerates local corrosion of steel in both solutions, which is associated with an increase in the amount of hydrogen in the metal. An increase in the duration of the cathodic half-period of the CIP increases the density and total area of the pitting at less negative values of the Ec. At more negative Еc values, an increase in the duration of cathodic polarization reduces the intensity of local.
About the Authors
A. A. Rybkina
A.N. Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences
Russian Federation
Russian Federation
Leninsky pr. 31, 119071 Moscow
K. V. Mizitov
A.N. Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences
Russian Federation
Russian Federation
Leninsky pr. 31, 119071 Moscow
A. I. Marshakov
A.N. Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences
Russian Federation
Russian Federation
Leninsky pr. 31, 119071 Moscow
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For citations:
Rybkina A.A., Mizitov K.V., Marshakov A.I. The effect of cyclic potential pulse on corrosion and hydrogenation of carbon steel in chloride solutions with a pH close to neutral. Title in english. 2024;(3):111-130. (In Russ.) https://doi.org/10.61852/2949-3412-2024-2-3-111-130
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