Anti-coking characteristics of Al-Si-Cr coating on 25Cr35NiNb alloy

QU Xiaoyu; LIU Jinglei; XU Hong; LU Yang; LIU Jianshu

doi:10.11949/j.issn.0438-1157.20141215

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Anti-coking characteristics of Al-Si-Cr coating on 25Cr35NiNb alloy

更新时间：2025-12-10

- Anti-coking characteristics of Al-Si-Cr coating on 25Cr35NiNb alloy
- CIESC Journal Issue 3, Pages: 1059-1065(2015)
- 作者机构：
  
  1. 华东理工大学机械与动力工程学院,上海,200237
  2. 无锡化工装备有限公司,江苏,无锡,214131
- 作者简介：
- 基金信息：
- DOI：10.11949/j.issn.0438-1157.20141215
  CLC： G174.4
- Online First：05 March 2015，
  
  Published：05 March 2015
- 稿件说明：
移动端阅览
QU Xiaoyu, LIU Jinglei, XU Hong, et al. Anti-coking characteristics of Al-Si-Cr coating on 25Cr35NiNb alloy[J]. CIESC Journal, 2015, (3): 1059-1065.
DOI：

QU Xiaoyu, LIU Jinglei, XU Hong, et al. Anti-coking characteristics of Al-Si-Cr coating on 25Cr35NiNb alloy[J]. CIESC Journal, 2015, (3): 1059-1065. DOI： 10.11949/j.issn.0438-1157.20141215.

摘要

采用固体粉末包埋渗方法在25Cr35NiNb合金表面制备Al-Si-Cr涂层

通过乙烯裂解模拟装置中的结焦实验

对涂层抑制结焦性能进行分析评价。运用金相显微镜、扫描电子显微镜(SEM)和能谱仪(EDS)等方法分析了涂层显微组织及结焦层形貌特征。结果表明

采用粉末包埋共渗可以得到厚度在130 mm左右的Al-Si-Cr涂层

涂层具有多层结构且组织致密

外层为富铝硅层

内层为富铬硅层;Al-Si-Cr涂层具有良好的抗结焦性能

可有效抑制催化结焦

抑制结焦率达72.5%。

Abstract

Al-Si-Cr coating was prepared on the surface of 25Cr35NiNb alloy by pack cementation

and its anti-coking properties were studied by coking experiment using ethylene cracking test apparatus. The microstructure of coating and the morphology of coke were investigated with metallurgic microscope

electronic scanning microscope (SEM) and energy dispersive X-ray spectrometer (EDS). Al-Si-Cr coating with thickness of about 130 mm was obtained by pack cementation. The coating had multiple layers with dense structure

consisting of an outer layer composed of aluminum-silicon-rich compounds and an inner layer composed of chromium- silicon-rich compounds. The Al-Si-Cr coating had excellent coking inhibiting properties. It could inhibit catalytic coking effectively

and the rate of coke inhibition was up to 72.5%.

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