Corrosion of Stainless Steel by Urea at High Temperature

Galakhova, Anastasiia; Kadisch, Fabian; Mori, Gregor; Heyder, Susanne; Wieser, H.; Sartory, Bernhard; Burger, Simon

doi:10.3390/cmd2030024

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2022

2024

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Cited by 3 publications

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Corrosion of 1.4016 Ferritic Steel by Urea at High Temperature

Galakhova

Kadisch

Mori

et al. 2023

J. of Materi Eng and Perform

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The corrosion behavior of a ferritic unstabilized stainless steel 1.4016 during decomposition of aqueous urea solution at high temperature has been investigated. Corrosion was obtained from 100 h of cyclic heating (from room temperature up to 600 °C) and injection of aqueous urea solution on the steel plate in a laboratory-scale test bench. The evaluation procedure covered the metallographic analysis of corroded steel samples by high-resolution scanning electron microscopy (HR-SEM) and transmission electron microscopy (TEM). Uniform corrosion underneath deposits was found as one of the drivers for degradation of the steel. Damage happened by high-temperature depassivation of stainless steel due to the excess of the aggressive medium. Besides uniform corrosion, a nitridation layer underneath surface oxides together with chromium carbonitride particles precipitated through the whole depth of the sample was identified resulting in intergranular attack.

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