Chlorine induced high-temperature corrosion mechanisms in HVOF and HVAF sprayed Cr3C2-based hardmetal coatings

Davide Fantozzi, Ville Matikainen, Mikko Uusitalo, Heli Koivuluoto, Petri Vuoristo

Research output: Contribution to journalArticleScientificpeer-review

16 Citations (Scopus)

Abstract

A novel method that combines thermal analysis and traditional furnace corrosion tests was used to study the corrosion behaviour of thermally sprayed Cr3C2-based hardmetal coatings at 450 °C and 550 °C under a KCl deposit. This method enabled the identification of the onset temperature of chlorine-induced oxidation to be within 450–500 °C. Two corrosion mechanisms were suggested for these temperatures. At 450 °C, the corrosion rate was slow and mainly controlled by the formation of K2CrO4. Exposure at 550 °C caused the formation of fine interconnected secondary-carbide precipitates in the metal matrix. Their fast corrosion was identified as the major cause of degradation.

Original languageEnglish
Article number108166
Number of pages11
JournalCorrosion Science
Volume160
DOIs
Publication statusPublished - 2019
Publication typeA1 Journal article-refereed

Keywords

  • A. Metal matrix composites
  • A. Superalloys
  • B. SEM
  • B. TGA
  • B. XRD
  • C. Chlorination
  • C. High temperature corrosion
  • C. Thermodynamic diagrams

Publication forum classification

  • Publication forum level 3

ASJC Scopus subject areas

  • General Chemistry
  • General Chemical Engineering
  • General Materials Science

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