Influence of metallic matrix on erosion-corrosion behaviour of high chromium cast irons under slurry impingement conditions

L. Giourntas, F. Brownlie, T. Hodgkiess, A.M. Galloway

Research output: Contribution to journalArticlepeer-review

Abstract

Chromium cast irons (CCI) comprise versatile materials that encompass a range of compositions and microstructures often chosen to promote good wear resistance. There are, however, issues that arise when the cast iron is required to operate in conditions where corrosion, as well as, wear is a factor. This scenario usually results in adapting the composition of the CCI in order to achieve higher chromium content in the metallic matrix and, thereby, to attain the corrosion resistance exhibited by high-Cr stainless steels. This paper comprises a comparison of the corrosive wear behaviour of an austenitic-based hypoeutectic cast iron and a martensitic-based, near-eutectic cast iron with the associated stainless steels, in a saline water under solid-liquid submerged jet conditions. A comprehensive experimental methodology has been adopted including evaluation of the behaviour of the materials in free erosion-corrosion conditions and with the application of cathodic protection. This approach has extended the understanding of the fundamental deterioration mechanisms in different hydrodynamic conditions and has highlighted the complexities of the mechanical/electrochemical interactions occurring during erosion-corrosion. An important feature is the influence of micro-galvanic interactions at phase boundaries. The impact of the findings has been discussed in terms of CCI alloy selection and corrosion control strategies.
Original languageEnglish
Article number203834
Number of pages12
JournalWear
Volume477
Early online date20 Mar 2021
DOIs
Publication statusPublished - 18 Jul 2021

Keywords

  • erosion-corrosion
  • chromium cast irons
  • slurry impingement

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