Corrosion of 1.4016 Ferritic Steel by Urea at High Temperature

Research output: Contribution to journalArticleResearchpeer-review

Authors

  • Susanne Heyder
  • Helmut Wieser
  • Bernhard Sartory
  • Jaroslaw Wosik
  • Sabine Schwarz
  • Simon Burger

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 languageEnglish
Pages (from-to)9153–9162
Number of pages10
JournalJournal of Materials Engineering and Performance
Volume32.2023
Issue numberOctober
DOIs
Publication statusE-pub ahead of print - 9 Mar 2023