Influence of a Protective Coating Slurry on Enhancing the Descaling Ability and Oxidation Resistance of 9% Nickel Steel  

作　　者：何影 魏连启 ZHANG Xiaomeng ZHOU Xun WANG Shuhua SHAN Xin YE Shufeng 

机构地区：[1]State Key Laboratory of Multi-phase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences [2]Graduate University of Chinese Academy of Sciences [3]Shougang Jingtang United Iron & Steel Co.,Ltd. [4]Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences

出　　处：《Journal of Wuhan University of Technology(Materials Science)》2014年第6期1252-1257,共6页武汉理工大学学报（材料科学英文版）

基　　金：Funded by the Key Projects in the National Science &Technology Pillar Program in the Twelfth Five-year Plan Period(No.2012BAB08B04);the National Natural Science Foundation of China(No.51202249)

摘　　要：A kind of ceramic slurry was prepared and sprayed onto the surface of 9Ni steel at room temperature. The coating layer will not only reduce the depth of the formed Ni-enriched entanglement at high temperature but also have an excellent ability to resist oxidation of the 9Ni steel. Compared to bare specimen, the depths of the entanglement of the coated 9Ni specimen could be successfully reduced by 74.1% and the oxidation loss be decreased by 62.3% by heating at 1 250 ℃ for 60 min. In addition, the coated specimen indicates no trace of oxide pegs. It proves that the coating has outstanding improvement to internal oxidation resistance. Some characterization methods such as metalloscopy, XRD, XPS, SEM and EDX have been used to reveal a possible protective mechanism. The result shows that the coating layer reacts with the iron oxide to form Mg Fe2O4 on the surface of the coated specimen, which could provide a smaller diffusion coefficient rate of Fe ion. The coating with a low cost and easy implementation is promisingly applicable in the slab-reheating process of the 9Ni steel.A kind of ceramic slurry was prepared and sprayed onto the surface of 9Ni steel at room temperature. The coating layer will not only reduce the depth of the formed Ni-enriched entanglement at high temperature but also have an excellent ability to resist oxidation of the 9Ni steel. Compared to bare specimen, the depths of the entanglement of the coated 9Ni specimen could be successfully reduced by 74.1% and the oxidation loss be decreased by 62.3% by heating at 1 250 ℃ for 60 min. In addition, the coated specimen indicates no trace of oxide pegs. It proves that the coating has outstanding improvement to internal oxidation resistance. Some characterization methods such as metalloscopy, XRD, XPS, SEM and EDX have been used to reveal a possible protective mechanism. The result shows that the coating layer reacts with the iron oxide to form Mg Fe2O4 on the surface of the coated specimen, which could provide a smaller diffusion coefficient rate of Fe ion. The coating with a low cost and easy implementation is promisingly applicable in the slab-reheating process of the 9Ni steel.

关 键 词：9Ni steel protective coating oxidation resistance descaling ability 

分 类 号：TG174.4[金属学及工艺—金属表面处理]