摘要
It is difficult to assess fatalities due to high temperature corrosion,such as plant closure time,production loss,decrease in productivity,contamination,etc.In this context,the AISI 422 martensitic steel is a popular choice for high temperature applications due to its unique properties.The durability of this material can be increased by coating technology.The Ni-20Cr composite powder is a highly recommended choice for high-temperature applications.In this research,Ni-20Cr coating was sprayed on AISI 422 steel,using a flame spray process with two different thicknesses of 250-350μm and 350-450μm.Corrosion studies have been carried out at temperatures of 600℃ and 900℃ for Na_(2)SO_(4)+60%V_(2)O_(5) salt solution environment.The corrosion kinetics were studied with the help of the Wagner equation.Micrographics analysis has been performed by Scanning electron microscopy(SEM)coupled with energy-dispersive spectroscopy(EDS),and X-ray diffraction(XRD)technique.Coated material has been shown better corrosion resistance compared to bare.The low-thickness coating has better corrosion resistance corresponding to both bare and high-thickness.
