The effect of methyldiethanolamine (MDEA) aqueous solution ageing on the corrosion mechanisms of A414(F) steel under acidic conditions
Abilmagzhanov A.Z. Ivanov N.S. Adelbayev I.E. Ivanova N.A. Oparin S.K. Kholkin O.S. Kudryashov V.V.
March 2026Elsevier B.V.
Results in Engineering
2026#29
The comprehensive analysis of the A414(F) structural steel corrosion mechanism in an aqueous methyldiethanolamine (MDEA) solution degraded under real industrial conditions (Aged) vs Fresh one was conducted. The accelerated corrosion test was conducted at 150 °C to evaluate the corrosion activity of the solutions. The relationship between the composition of the aged solution and the steel corrosion morphology was examined. The results showed that A414(F) steel corroded at a low rate of about 0.16 mm/year in the Fresh MDEA solution. However, the corrosion rate increased extremely up to 9.2 mm/year (∼ 60 times higher) when the coupons were tested in the Aged MDEA solution. This was attributed to a complex corrosion mechanism involving the destruction of the protective oxide film in the presence of chloride ions, as well as to the local H2SO4-acid corrosion in the presence of elemental sulfur due to mercaptans (precursors to elemental sulfur). Saturation of the Aged MDEA solution with hydrogen sulfide has a strong inhibitory effect (∼93% of the inhibition efficiency), reducing the corrosion rate of steel from 9.2 mm/year to 0.62 mm/year, a reduction of 15 times. This finding underscores protective properties of a dense FeS2-pyrite film, even in the presence of other aggressive agents, which has practical implications for industrial corrosion control. Based on the data obtained, direct recommendations were provided for improving corrosion management in industry. Copyright
A414(F) structural steel , Aged solution , Aqueous methyldiethanolamine (MDEA) solution , Corrosion mechanism , Corrosion morphology , Hydrogen sulfide inhibition effect
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D.V. Sokolsky Institute of Fuel, Catalysis and Electrochemistry JSC, 142 Kunayev Str., Almaty, 050010, Kazakhstan
Renewable Energy Lab, “National laboratory Astana”, Nazarbayev University, 53 Kabanbay Batyr Ave., Astana, Kazakhstan
D.V. Sokolsky Institute of Fuel
Renewable Energy Lab
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