纳米NiCrBSi-TiB_2涂层在硫酸熔盐中的热腐蚀行为研究  

Hot Corrosion Behavior of the Nanostructured NiCrBSi-TiB_2 Coating in Molten Sulfate Salt

作　　者：吴姚莎[1] 王迪[2] 曾德长[2] 

机构地区：[1]中山火炬职业技术学院光电工程系,广东中山528436 [2]华南理工大学材料科学与工程学院,广州510640

出　　处：《表面技术》2015年第4期113-117,共5页Surface Technology

基　　金：广东省自然科学基金项目(S2013040016360);中山市科技计划项目(20123A380)~~

摘　　要：目的研究纳米NiCrBSi-TiB2涂层在800℃下的Na2SO4-30%(质量分数)K2SO4熔盐中的热腐蚀行为。方法采用超音速火焰技术在中碳钢表面喷涂纳米NiCrBSi-TiB2涂层,以饱和Na2SO4-30%K2SO4溶液为腐蚀介质,研究该涂层在800℃时的热腐蚀行为。结果微米涂层晶粒粗大,Si的扩散系数低,易出现贫Si富Cr层,形成的Cr2O3膜在碱性熔盐中具有较低的溶解度,对涂层具有良好的保护作用。结论微米涂层在Na2SO4-30%K2SO4熔盐中具有更优的抗热腐蚀性能。Objective To study the hot corrosion behavior of the NiCrBSi-TiB2 coating in molten Na2SO4-30% K2SO4 salt at800 ℃. Methods The nanostructured NiCrBSi-TiB2 coating was sprayed on the surface of carbon steel by high velocity oxy-fuel（ HVOF）,and its hot corrosion behavior at 800 ℃ was investigated using saturated Na2SO4-30% K2SO4 solution as the corrosion medium. Results The micron coating had coarse grains,and the diffusion coefficient of Si was low,which easily led to the formation of Si-depleted Cr-rich layer,and the Cr2O3 film formed had relatively low solubility in basic molten salt,which could well protect the coating. Conclusion The micron coating had higher resistance against hot corrosion in molten Na2SO4-30% K2SO4 salt.

关 键 词：纳米涂层 热腐蚀 TIB2 Na2SO4-30%K2SO4 

分 类 号：TG172.6[金属学及工艺—金属表面处理] TG174.442[金属学及工艺—金属学]