Inconel 625合金在富氧高温熔渣中的腐蚀行为

兰州理工大学学报 ›› 2023, Vol. 49 ›› Issue (3): 9-14.

Inconel 625合金在富氧高温熔渣中的腐蚀行为

贾金凤^*1,*, 王江², 陈大林², 刘俊钊³, 王振铭³

1.兰州信息科技学院材料与化工工程学院, 甘肃兰州 730300;
2.金川集团股份有限公司, 甘肃金昌 737103;
3.兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室, 甘肃兰州 730050

收稿日期:2022-12-03 出版日期:2023-06-28 发布日期:2023-07-07
通讯作者: 贾金凤(1985-),女,河南周口人,讲师. Email:lois_jia@126.com
基金资助:
甘肃省科技计划资助(20JR10RA494)

Corrosion behavior of inconel 625 alloy in the oxygen-rich and high-temperature slag

JIA Jin-feng¹, WANG Jiang², CHEN Da-lin², LIU Jun-zhao³, WANG Zhen-ming³

1. School of Materials and Chemical Engineering, Lanzhou College of Information Science and Technology, Lanzhou 730300,China;
2. Jinchuan Group Co. Ltd., Jinchang 737103, China;
3. State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou Univ. of Tech., Lanzhou 730050, China

Received:2022-12-03 Online:2023-06-28 Published:2023-07-07

摘要/Abstract

摘要： 针对镍顶吹熔炼喷枪使用寿命低的问题,以Inconel 625合金为替代材料,采用挂片试验,研究了该合金在氧气流量为15 000~42 000 Nm³/h,熔渣温度1 400 ℃下的腐蚀行为及机理.采用金相显微镜、扫描电镜、能谱仪、电子探针及显微硬度计等分析了试样的组织形貌、元素分布及硬度.结果表明:15~20 h时Cr₂O₃等氧化膜的形成阻碍了氧化腐蚀的进行;合金的严重腐蚀区域发生在表面0~250 μm,250~1 650 μm为热影响区;富Nb贫Cr区优先被腐蚀,随着由Cr₂O₃、Fe₂O₃、Cr₂S₃、Nb_0.1Ni_0.9、[Mg、Fe]₂SiO₄等构成的复杂氧化膜体系的不断形成与分解,合金中各主要元素不断腐蚀脱落,且氧化膜中的Mg、S元素来源于熔渣;腐蚀后的合金表面硬度明显降低.

关键词: Inconel 625合金, 富氧高温, 熔渣, 腐蚀行为

Abstract: In order to solve the problem of low service life of spray gun for nickel top-blown smelting, Inconel 625 alloy was used as a substitute material, corrosion behavior and mechanism of Inconel 625 alloy were studied under actual working conditions: oxygen flow rate 15 000~42 000 Nm³/h and slag temperature 1 400 ℃.The microstructure, element distribution and hardness of the samples were analyzed by OM, SEM, EDS, EMPA and micro-hardness tester. The results showed that the formation of oxide film such as Cr₂O₃ oxide hindered the corrosion process during 15~20 h. The severe corrosion zone of the alloy occur in 0 μm to 250 μm on the surface, and the heat-affected zone is in 250~1 650 μm. Nb-rich and Cr-poor areas are corroded first. With the continuous formation and decomposition of the complex oxide film system composed of Cr₂O₃, Fe₂O₃, Cr₂S₃, Nb_0.1Ni_0.9, [Mg, Fe]₂SiO₄, the main elements in the alloy are corroded off, and Mg and S elements in the oxide film are derived from slag. The hardness of the corroded alloy surface decrease obviously.

Key words: Inconel 625 alloy, oxygen-enriched and high temperature, slag, corrosion behavior

中图分类号:

TG172.9

贾金凤, 王江, 陈大林, 刘俊钊, 王振铭. Inconel 625合金在富氧高温熔渣中的腐蚀行为[J]. 兰州理工大学学报, 2023, 49(3): 9-14.

JIA Jin-feng, WANG Jiang, CHEN Da-lin, LIU Jun-zhao, WANG Zhen-ming. Corrosion behavior of inconel 625 alloy in the oxygen-rich and high-temperature slag[J]. Journal of Lanzhou University of Technology, 2023, 49(3): 9-14.

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