Corrosion and isothermal interdiffusion properties of Ni-Al coatings under simulated biomass combustion conditions  

作　　者：Yi Xu Zhenhua Wu Hongyu Hu Yuefei Wang Duoli Wu 

机构地区：[1]College of Mechanical Engineering,Yangzhou University,Yangzhou 225127,China

出　　处：《Surface Science and Technology》2023年第1期301-310,共10页表面科学技术(英文)

基　　金：funded by the National Natural Science Foundation of China(52101100);the General Project of Natural Science Research in Colleges and Universities of Jiangsu Province(21KJB430008);Yangzhou City-Yangzhou University Cooperation Foundation(YZ2023208);the Qing Lan Project of Yangzhou University(2022).

摘　　要：The main issue with using biomass fuels in power plants is fireside corrosion.Applying corrosion-resistant coatings is one potential choice.The current study examines how a Ni-Al diffusion coating on austenitic stainless steel reacts to corrosion and interdiffusion(TP347H).Nickel was electrolytically deposited to create Ni-Al coatings,which were then pack aluminized at 650℃.With an internal layer of Ni and a Ni2Al3 outer layer,a homogenous and dense Ni-Al coating was created.Samples were heated to 560℃ for 168 h in an environment designed to simulate the combustion of biomass.A localized corrosion attack was the result.By using isothermal heat treatment in static air at 650℃ or 700℃ for up to 3000 h,interdiffusion was examined.In the course of the interdiffusion process,the Ni2Al3 eventually changed into NiAl and Ni3Al.At both temperatures,porosity formed at the intersection of the Ni-Al coating and the Ni layer and grew with time.

关 键 词：Ni-Al coatings Isothermal interdiffusion High temperature corrosion Biomass-combustion 

分 类 号：TG1[金属学及工艺—金属学]