Molten salt induced corrosion of Inconel 625 superalloy in PbSO 4-Pb 3O 4-PbCl 2-Fe 2O 3-ZnO environment

E. Mohammadi Zahrani, A. M. Alfantazi

Research output: Contribution to journalArticlepeer-review

63 Scopus citations

Abstract

Corrosion behavior of alloy 625 was studied in a molten salt consisting of 47PbSO 4-23 ZnO-13 Pb 3O 4-10Fe 2O 3-7PbCl 2 (wt.%) under air atmosphere at 600, 700 and 800°C, utilizing OCP, potentiodynamic polarization, EIS and weight-loss measurement techniques. Phase structure, morphology and chemical analysis of corrosion products and scales were characterized by means of XRD, SEM/EDX, and ICP/AAS.General surface corrosion, intergranular corrosion, formation of voids and, a network of distributed pores on surface and cross-section, plus internal oxidation and sulfidation were identified as different modes of corrosion attack. EIS data fit to a porous and non-protective barrier layer electrochemical model.

Original languageBritish English
Pages (from-to)340-359
Number of pages20
JournalCorrosion Science
Volume65
DOIs
StatePublished - Dec 2012

Keywords

  • A. Molten salt
  • A. Superalloys
  • B. EIS
  • B. XRD
  • C. High temperature corrosion
  • C. Oxidation

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