The electrochemical response of stainless steels in liquid-solid impingement

X. Hu, A. Neville

Research output: Contribution to journalArticle

79 Citations (Scopus)

Abstract

High-alloy stainless steels exhibit complex corrosion behaviour under liquid-solid impingement conditions compared with in static conditions. In this study the corrosion resistance under erosion-corrosion conditions and the overall erosion-corrosion resistance were examined for high-alloy stainless steel UNS S32654 and a standard austenitic stainless steel (UNS S31603) at 18 and 50°C in 3.5% NaCl with solid loadings ranging from 10 to 6000 mg/1. It has been found from this study that, as expected, high-grade stainless steel UNS S32654 exhibits better corrosion and erosion-corrosion resistance under all the conditions applied. The benefits from alloying additions such as Mo, Cr, N have been demonstrated to be in the reduction of the metal dissolution rate when the surface is depassivated and superior repassivation performance. Also, the electrochemical response has been monitored as a function of solid loading, impinging velocity and temperature. The critical levels of solid loading and velocity at which a transition from flow-induced corrosion to erosion-corrosion takes place have been determined in this study giving an indication of the resistance of the passive film to mechanical breakdown. ©2004 Elsevier B.V. All rights reserved.

Original languageEnglish
Pages (from-to)641-648
Number of pages8
JournalWear
Volume258
Issue number1-4 SPEC. ISS.
DOIs
Publication statusPublished - Jan 2005

Keywords

  • Corrosion
  • Electrochemical
  • High-alloy stainless steel
  • Impingement

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