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Reza Beygi

Reza Beygi

Academic rank: Associate Professor
ORCID: https://orcid.org/0000-0002-0110-1642
Education: PhD.
ScopusId: 36337544600
Faculty: Engineering
Address: Arak University
Phone: 086-32625824

Research

Title
Hot corrosion behavior of CoWSi/WSi2 coating exposed to Na2SO4þNaCl salt at 900 1C
Type
JournalPaper
Keywords
CoWSi/WSi2 coating; Cyclic hot corrosion; Molten salt
Year
2016
Journal Ceramics International
DOI
Researchers Majid Zarezadeh Mehrizi ، Ghasem Eisaabadi bozcheloei ، Reza Beygi

Abstract

In this study, the high temperature hot corrosion behavior of a CoWSi/WSi2 composite coating was investigated. Hot corrosion studies were performed on CoWSi/WSi2 coated nickel specimens after exposure to a molten Na2SO4þNaCl salt environment at 900 1C under cyclic conditions. Thermogravimetric technique was used to establish the kinetics of corrosion. XRD and SEM/EDS techniques were used to analyze the corrosion products. The oxide scale formed on the coating surface was complex and the hot corrosion resistance of coating may be attributed to the formation of oxides and spinels of silicon, cobalt and tungsten. Also, NaCl accelerated the degeneration of the coating because of producing the volatile CoCl2 and thereby oxygen and sulfur could easily penetrate into the coatings and caused the formation of internal oxide and sulfide.