Alloy 304HCu in advanced ultra-supercritical steam: Exploring the early oxidation mechanism, oxide scale structure and the effect of steam pressure

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

Corrosion Science Pub Date : 2025-09-20 DOI:10.1016/j.corsci.2025.113339

C. Sundaresan, Bhagwat Ghule , Dandapani Vijayshankar, V.S. Raja

{"title":"Alloy 304HCu in advanced ultra-supercritical steam: Exploring the early oxidation mechanism, oxide scale structure and the effect of steam pressure","authors":"C. Sundaresan, Bhagwat Ghule , Dandapani Vijayshankar, V.S. Raja","doi":"10.1016/j.corsci.2025.113339","DOIUrl":null,"url":null,"abstract":"<div><div>Alloy 304HCu was exposed to a simulated advanced ultra-supercritical steam (AUSC) environment at 650 ℃, 31 MPa, for various time durations ranging up to a maximum of 600 h. The nature of early-stage oxidation and the evolution of oxide scales over time were studied in detail through complementary characterization techniques. Additionally, a 100-hour test at 650 ℃, 25 MPa, was carried out to validate the effect of steam pressure on oxidation. The alloy initially formed a thin Cr-rich oxide, which later broke down primarily due to Cr volatilization and gave rise to thick, dual-layered oxides comprising an outer magnetite and an internal oxidation zone (IOZ). The IOZ was made up of alternating regions of Fe-Cr solid solution spinel and metallic (Ni, Cu, Fe)-rich phase as a result of the low oxygen activity within the IOZ and the selective oxidation phenomenon. The unoxidized (Ni, Cu, Fe)-rich phase does not seem to offer any resistance to the growth of the internal oxide front. AUSC steam was found to cause severe oxidation compared to supercritical steam reported in the literature, and the role of steam pressure towards the same was experimentally validated. The results are important in light of the alloy’s proposed usage in the global AUSC program.</div></div>","PeriodicalId":290,"journal":{"name":"Corrosion Science","volume":"257 ","pages":"Article 113339"},"PeriodicalIF":7.4000,"publicationDate":"2025-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Corrosion Science","FirstCategoryId":"88","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0010938X25006675","RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}

引用次数: 0

Abstract

Alloy 304HCu was exposed to a simulated advanced ultra-supercritical steam (AUSC) environment at 650 ℃, 31 MPa, for various time durations ranging up to a maximum of 600 h. The nature of early-stage oxidation and the evolution of oxide scales over time were studied in detail through complementary characterization techniques. Additionally, a 100-hour test at 650 ℃, 25 MPa, was carried out to validate the effect of steam pressure on oxidation. The alloy initially formed a thin Cr-rich oxide, which later broke down primarily due to Cr volatilization and gave rise to thick, dual-layered oxides comprising an outer magnetite and an internal oxidation zone (IOZ). The IOZ was made up of alternating regions of Fe-Cr solid solution spinel and metallic (Ni, Cu, Fe)-rich phase as a result of the low oxygen activity within the IOZ and the selective oxidation phenomenon. The unoxidized (Ni, Cu, Fe)-rich phase does not seem to offer any resistance to the growth of the internal oxide front. AUSC steam was found to cause severe oxidation compared to supercritical steam reported in the literature, and the role of steam pressure towards the same was experimentally validated. The results are important in light of the alloy’s proposed usage in the global AUSC program.

查看原文本刊更多论文

304HCu合金在先进超超临界蒸汽中的早期氧化机理、氧化垢结构及蒸汽压力的影响

304HCu合金在650℃，31 MPa的模拟高级超超临界蒸汽（AUSC）环境中暴露不同的时间，最长时间为600 h。通过互补表征技术详细研究了早期氧化的性质和氧化鳞片随时间的演变。另外，在650℃、25 MPa条件下进行了100小时的试验，验证了蒸汽压力对氧化的影响。合金最初形成一种薄的富Cr氧化物，后来主要由于Cr的挥发而分解，并产生厚的双层氧化物，包括外部磁铁矿和内部氧化区（IOZ）。由于IOZ内的低氧活性和选择性氧化现象，IOZ由Fe- cr固溶体尖晶石和富金属（Ni, Cu, Fe）相交替组成。未氧化的富（Ni, Cu, Fe）相似乎对内部氧化物前缘的生长没有任何抵抗作用。与文献报道的超临界蒸汽相比，AUSC蒸汽引起了严重的氧化，并通过实验验证了蒸汽压力对其的作用。鉴于该合金在全球AUSC计划中的拟议使用，该结果非常重要。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

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.