High-temperature corrosion behavior of bare and NiCr-coated AISI 422 steel by varying the coating thickness in the Na_(2)SO_(4)+60%V_(2)O_(5) environment  

作　　者：Niyamat Ullah Khan S.K.Rajput Maharshi Yadav 

机构地区：[1]Department of Mechanical Engineering,Bundelkhand Institute of Engineering and Technology,Jhansi,Uttar Pradesh,India [2]Department of Chemical Engineering and Biochemical Engineering,Rajiv Gandhi Institute of Petroleum Technology,Amethi,Uttar Pradesh,India

出　　处：《Surface Science and Technology》2023年第1期381-397,共17页表面科学技术(英文)

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.

关 键 词：Thermal spray process Hot corrosion Martensitic steel Surface coating Molten salt 

分 类 号：TG1[金属学及工艺—金属学]