Hot Corrosion Behavior of a High Velocity Arc-Sprayed Fe-Cr-B-C Coating

作     者：Guo Wenmin Wu Yuping Li Gaiye Wang Qian He Zhihua Hong Sheng 

作者机构：Hohai Univ Coll Mech & Mat Nanjing 210098 Jiangsu Peoples R China 

出 版 物：《稀有金属材料与工程》 (Rare Metal Materials and Engineering)

年 卷 期：2012年第41卷第S1期

页      面：456-459页

核心收录：

学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

主　　题：arc spraying coating hot corrosion 

摘      要：A Fe-Cr-B-C coating was prepared by electric arc spraying process to prevent the boiler tubes from hot corrosion at elevated temperatures.A hot corrosion resistance test was conducted in a mixed molten salt of Na2SO4 and K2SO4(7:3)at 700 ℃for a total period of 156 *** microstructure and phases of the coatings before and after exposed to the hot corrosion were investigated by scanning election microscopy(SEM),optical microscopy(OM)and X-ray diffraction(XRD).The hardness and porosity were *** hot corrosion behavior of the coatings was examined by the measurement of corrosion mass gain and the observation of corrosion *** results show that some splats of particles are formed on flat substrate surfaces and the coatings have a dense typical layer structure of electric arc thermally spraying *** amorphous phase exist in the *** coatings have an excellent resistance to hot *** formation of oxides of chromium on the exposed surface may be contributing better resistance to hot *** corrosion of the coatings follows the oxidation and sulfidation mechanism.