Corrosion studies with a new laboratory-scale system simulating large-scale diesel engines operating with residual fuels - Part I: Corrosion of Nimonic 80 A samples

Jussi Lyyränen, Jorma Jokiniemi (Corresponding Author), Esko Kauppinen, Aulis Silvonen

Research output: Contribution to journalArticleScientificpeer-review

7 Citations (Scopus)

Abstract

A new laboratory-scale deposition–corrosion apparatus (DCA) has been designed to study the corrosion of Nimonic 80 A samples. The apparatus simulates conditions in a large-scale diesel engine operated with high sulphur- and ash-content heavy fuel oils. The fuel composition and ash particle formation were simulated with synthetic ash particles (SAP) generated by aerosol methods. The deteriorated areas, i.e. the zones under the deposits, ranged from 0 μm at 700 °C with no synthetic ash particle feed to 135 μm at 750 °C with synthetic ash particle and SO2(g) feeds. A zone of “black islands” (thickness 30 μm), i.e. internal precipitates, rich in S, Cr and Ti indicating internal sulphidation of the base material was observed at the bottom of the regions under the deposits. A comparison between a Nimonic 80 A exhaust valve from a field endurance test and material studied with this laboratory system indicated similar internal sulphidation mechanisms. Corrosion propagation for Nimonic 80 A is also discussed.
Original languageEnglish
Pages (from-to)353 - 373
JournalFuel Processing Technology
Volume86
Issue number4
DOIs
Publication statusPublished - 2005
MoE publication typeA1 Journal article-refereed

Keywords

  • large-scale diesel engine
  • diesel
  • diesel engines
  • corrosion
  • laboratory-scale system
  • Nimonic 80 A

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