Corrosion of 1.4016 Ferritic Steel by Urea at High Temperature
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Authors
Organisational units
External Organisational units
- Universität Augsburg
- Materials Center Leoben Forschungs GmbH
- Institute of Materials Science and Technology
- Faurecia Emissions Control Technologies
Abstract
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.
Details
Original language | English |
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Pages (from-to) | 9153–9162 |
Number of pages | 10 |
Journal | Journal of Materials Engineering and Performance |
Volume | 32.2023 |
Issue number | October |
DOIs | |
Publication status | E-pub ahead of print - 9 Mar 2023 |