Corrosion and carburization behavior of high-chromium alloys in high-temperature supercritical CO₂ with 3.1% H₂O addition

IF 7.4 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Corrosion Science Pub Date : 2025-09-05 DOI:10.1016/j.corsci.2025.113305

Ho Jung Lee , Gokul Obulan Subramanian , Changheui Jang

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Abstract

The corrosion and carburization behavior of four high-chromium (∼20 wt%) Fe- and Ni-based alloys (Alloy X, Alloy 230, Alloy 800HT and Alloy 282) were evaluated in supercritical CO₂ containing 3.1 vol% H₂O at 750 °C and 25 MPa for up to 1000 h. All alloys formed thin, continuous chromia (Cr₂O₃) layers and the corrosion rates followed the sequence of Alloy 282 > Alloy 800HT > Alloy 230 ≈ Alloy X. Parabolic kinetics were observed and were governed by the type and concentration of minor alloying elements such as Mn, Ti, Si, and Al. MnCr₂O₄ and TiO₂ were formed at the outermost oxide layer, whereas SiO₂ was observed at the oxide/matrix interface as either discrete particles or a continuous amorphous layer, depending on the alloying element content. Subscale internal oxides, mostly Al-rich alumina with traces of TiO₂, extended to depths that matched the bulk Al and Ti levels. The presence of 3.1 vol % H₂O accelerated oxide growth, yet carbon enrichment at the oxide/matrix interface was not detected. TEM-EELS mapping and SIMS depth profiling revealed only trace carbon confined to voids within the scale. The absence of interfacial carburization was attributed to the combined barrier effect of a thicker chromia scale formed by H₂O addition at high temperature and the structural modification of chromia through the incorporation of minor alloying elements.

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高铬合金在高温超临界CO₂中添加3.1% H₂O的腐蚀和渗碳行为

研究了四种高铬（~ 20 wt%）铁基和镍基合金（Alloy X、Alloy 230、Alloy 800HT和Alloy 282）在含3.1 vol% H₂O的超临界CO₂中在750℃、25 MPa、1000 H下的腐蚀和渗碳行为。所有合金均形成薄的连续铬化（Cr₂O₃）层，腐蚀速率依次为：Alloy 282 >； Alloy 800HT >； Alloy 230 ≈ Alloy x。观察到抛物动力学，并受Mn、Ti、Si和Al等微量合金元素的类型和浓度的支配。MnCr₂O₄和TiO₂在最外的氧化层形成，而SiO₂在氧化物/基体界面处形成离散颗粒或连续非晶层。取决于合金元素的含量。亚尺度的内部氧化物，主要是富含Al的氧化铝和微量的TiO 2，延伸到与大块Al和Ti水平相匹配的深度。3.1 vol % H₂O的存在加速了氧化物的生长，但在氧化物/基体界面未检测到碳富集。TEM-EELS制图和SIMS深度剖面显示，仅在比尺内的空隙中发现痕量碳。界面未渗碳的原因是高温下加入h2o形成的较厚的铬垢和少量合金元素对铬的结构改性共同作用的阻挡作用。

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来源期刊

Corrosion Science 工程技术-材料科学：综合

CiteScore

13.60

自引率

18.10%

发文量

763

审稿时长

46 days

期刊介绍： Corrosion occurrence and its practical control encompass a vast array of scientific knowledge. Corrosion Science endeavors to serve as the conduit for the exchange of ideas, developments, and research across all facets of this field, encompassing both metallic and non-metallic corrosion. The scope of this international journal is broad and inclusive. Published papers span from highly theoretical inquiries to essentially practical applications, covering diverse areas such as high-temperature oxidation, passivity, anodic oxidation, biochemical corrosion, stress corrosion cracking, and corrosion control mechanisms and methodologies. This journal publishes original papers and critical reviews across the spectrum of pure and applied corrosion, material degradation, and surface science and engineering. It serves as a crucial link connecting metallurgists, materials scientists, and researchers investigating corrosion and degradation phenomena. Join us in advancing knowledge and understanding in the vital field of corrosion science.