Corrosion of 1.4016 Ferritic Steel by Urea at High Temperature

Anastasiia Galakhova, Fabian Kadisch, Gregor Karl Mori, Susanne Heyder, Helmut Wieser, Bernhard Sartory, Jaroslaw Wosik, Sabine Schwarz, Simon Burger

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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.
Original languageEnglish
Pages (from-to)9153–9162
Number of pages10
JournalJournal of Materials Engineering and Performance
Issue numberOctober
Publication statusE-pub ahead of print - 9 Mar 2023

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