Inhibition of sulfuric acid corrosion of St3 and 10Kh18N10T steels by aqueous wood bark extracts
https://doi.org/10.21266/2079-4304.2026.258.390-404
Abstract
The corrosion inhibition mechanism of carbon steel St3 and austenitic steel 10Kh18N10T (10Cr18Ni10Ti) in sulfuric acid, and the possibility of increasing the anticorrosion effect of bark extracts by changing tree bark species composition, mineral, and organic additives, are insufficiently studied. Gravimetric method and polarization curves on a P-5848 potentiostat were used to study the effect of temperature (20 and 80°C) and composition of combined inhibitors based on aqueous extracts of aspen (EKO), spruce (EKE), and pine (EKS) bark on the rate and mechanism of corrosion of St3 and 10Kh18N10T steels in 2M solution H2SO4. This acid is used with an inhibitor additive for etching steel products. It has been established that at the same concentration of 1 g/l, the inhibitory effect of wood bark water-extractable substances (WES) on steel acid corrosion at 80°C increases in the order EKS < EKE < EKO. This effect is further enhanced at 2 g/l WES, when mixing bark extracts from different species, and even more with the addition of 1 g/l hexamethylenetetramine or potassium iodide as synergists. The addition of composition “0.5 g/l EKE + 0.5 g/l EKO + 1 g/l KI” to 2M H2SO4 reduces the corrosion rate of St3 carbon steel by 16 times at 80 °C, exhibits the most significant anticorrosion effect on 10Kh18N10T austenitic steel, and enhances the steels' ability for anodic passivation.
About the Author
E. V. Shkol’nikov
St.Petersburg State Forest Technical University
Russian Federation
Russian Federation
SHKO’NIKOV Evgeny V. – DSc (Chemical), Professor, Department of
Chemistry
Researcher ID: G-8108-2016
Scopus Author ID: 7003735499
194021. Institute per. 5. St. Petersburg
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Review
For citations:
Shkol’nikov E.V. Inhibition of sulfuric acid corrosion of St3 and 10Kh18N10T steels by aqueous wood bark extracts. Izvestia Sankt-Peterburgskoj lesotehniceskoj akademii. 2026;(258):390-404. (In Russ.) https://doi.org/10.21266/2079-4304.2026.258.390-404
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