金属热处理 ›› 2023, Vol. 48 ›› Issue (9): 208-213.DOI: 10.13251/j.issn.0254-6051.2023.09.035

• 组织与性能 • 上一篇    下一篇

Inconel625与Inconel601合金耐高温氯离子腐蚀性能及机理的比较研究

吴勇1,2, 孟施旭1,2, 孙清云1,2, 陈辉1,2, 夏思瑶1,2, 杨甫1,2, 夏春怀1,2, 杨汉哲1,2   

  1. 1.中国机械总院集团 武汉材料保护研究所有限公司, 湖北 武汉 430030;
    2.特种表面保护材料及应用技术国家重点实验室, 湖北 武汉 430030
  • 收稿日期:2023-04-10 修回日期:2023-07-19 出版日期:2023-09-25 发布日期:2023-10-25
  • 通讯作者: 孙清云,工程师,博士, E-mail: sqysunqingyun@163.com
  • 作者简介:吴 勇(1962—),男,研究员,主要研究方向为表面热处理及铝化物涂层,E-mail: ywurimp@Sina.com。
  • 基金资助:
    国家重点研发计划(2020YFB2010400);湖北省重点研发计划(2021BAA210);国家自然科学基金面上项目(52175182);湖北省自然科学基金(2022CFB936)

Comparative study of high temperature chloride corrosion resistance and mechanism of Inconel625 and Inconel601 alloys

Wu Yong1,2, Meng Shixu1,2, Sun Qingyun1,2, Chen Hui1,2, Xia Siyao1,2, Yang Fu1,2, Xia Chunhuai1,2, Yang Hanzhe1,2   

  1. 1. Wuhan Research Institute of Materials Protection Co., Ltd., CAM, Wuhan Hubei 430030, China;
    2. State Key Laboratory of Special Surface Protection Materials and Application Technology, Wuhan Hubei 430030, China
  • Received:2023-04-10 Revised:2023-07-19 Online:2023-09-25 Published:2023-10-25

摘要: 利用SEM、EDS以及XRD等分析手段研究了Inconel625和Inconel601合金的耐高温氯离子腐蚀性能以及腐蚀机理,对比分析了两种合金在1100 ℃高温氯离子腐蚀条件下的腐蚀动力学曲线、腐蚀产物以及腐蚀层的表面、截面形貌。结果表明,Inconel625和Inconel601合金都表现为前期腐蚀迅速后期平缓,Inconel625合金的耐高温氯离子腐蚀性能优于Inconel601合金。Inconel625合金在腐蚀过程中生成了含有复杂氧化物的氧化膜,Inconel601合金主要的腐蚀产物有Cr2O3、AlFeO3以及Al18Cr5相,Inconel625合金主要的腐蚀产物有Al2O3、Fe2O3、Cr5O12以及NiCrO4相。Inconel625合金由于Nb元素的钉扎作用以及尖晶石结构的NiCrO4的生成,增大了氧化膜的附着力,使其耐蚀性优于Inconel601合金。

关键词: Inconel625合金, 高温, 氯离子, 耐蚀性

Abstract: High temperature chloride ion corrosion resistance and corrosion mechanism of Inconel625 and Inconel601 alloys were studied by means of SEM, EDS and XRD. The corrosion kinetics curves, corrosion products and surface and cross section morphology of the corrosion layer of the two alloys were compared and analyzed under the condition of chloride ion corrosion at 1100 ℃. The results show that both Inconel625 and Inconel601 alloys exhibit rapid corrosion in the early stage and gentle corrosion in the later stage. The high temperature chloride corrosion resistance of the Inconel625 alloy is better than that of the Inconel601 alloy. In the corrosion process of the Inconel625 alloy, an oxide film containing complex oxides is formed. The main corrosion products of the Inconel601 alloy are Cr2O3, AlFeO3 and Al18Cr5 phases, while the main corrosion products of the Inconel625 alloy are Al2O3, Fe2O3, Cr5O12 and NiCrO4 phases. The Inconel625 alloy has better corrosion resistance than the Inconel601 due to the pinning effect of Nb element and the formation of NiCrO4 with spinel structure, which increases the adhesion of oxide film.

Key words: Inconel625 alloy, high temperature, chloride ion, corrosion resistance

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