文献类型：期刊文献

英文题名：FABRICATION OF SPINEL COATING ON HP40 ALLOY AND ITS INHIBITION EFFECT ON CATALYTIC COKING DURING THERMAL CRACKING OF LIGHT NAPHTHA

作者：Bao, Binbin[1];Liu, Jinglei[1];Xu, Hong[1];Wang, Zhiyuan[2];Zhang, Kai[1]

机构：[1]East China Univ Sci & Technol, Sch Mech & Power Engn, State Key Lab Chem Engn, Shanghai 200237, Peoples R China;[2]Univ Shanghai Sci & Technol, Sch Energy & Power Engn, Shanghai 200093, Peoples R China

年份：2018

卷号：35

期号：2

起止页码：721

外文期刊名：BRAZILIAN JOURNAL OF CHEMICAL ENGINEERING

收录：;EI(收录号：20184205939847);WOS:【SCI-EXPANDED(收录号:WOS:000446318600041)】；

基金：This work was gratefully supported by Research Fund for the Doctoral Program of Higher Education of China (20110074110009) and Sinopec Corp., China.

语种：英文

外文关键词：Pack cementation; Thermal oxidation; Spinel coating; Catalytic coking; Thermal cracking

摘要：A novel two-step process of Cr-Mn pack cementation and thermal oxidation was applied to fabricate a MnCr2O4 spinel coating on HP 40 alloy. The Cr-Mn diffusion layer formed after the Cr-Mn pack cementation process is lacking in Fe and Ni. A dense and uniform coating formed on the alloy following thermal oxidation. The coating is mainly composed of MnCr2O4 spinel phase, while the outer surface of the coating is completely MnCr2O4 spinel. The coating exhibits a favorable thickness of about 7 mu m according to SEM and EDS maps of its cross-section. The MnCr2O4 spinel coating significantly affects the coking mechanism and coke property according to coking experiments. Raman spectroscopy shows that the coated sample inhibits catalytic coke formation as more disordered carbon and amorphous carbon layers are present. Moreover, the coating is stable in coking and decoking environments.