625合金在含杂质的高温CO2环境中的腐蚀及氧化结核形成机理

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

Corrosion Science Pub Date : 2025-09-06 DOI:10.1016/j.corsci.2025.113307

Shanmugam Mannan Muthu, Taejeong An, Chaewon Jeong, Changheui Jang

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引用次数: 0

摘要

研究了杂质对625合金在CO2（0.1 MPa）中腐蚀行为的影响，O2和CO杂质混合，温度600℃，腐蚀时间500 h。表面形成了非常薄而致密的铬层，没有明显的氧化层破坏。此外，在所有环境条件下，表面都形成了富铌的结核氧化物。由于氧化物生长应力的作用，在氧化结核表面形成裂纹。XRD结果表明，腐蚀合金表面以富cr氧化物为主，并以Ni3Mo和γ-Ni3Al相为主。在CO2+O2条件下，由于Cr2O3的致密和致密，试样的氧化程度较低。在氧化物-金属界面未观察到碳沉积。然而，在CO2+CO腐蚀条件下，在氧化结核以下的地下发现了碳化物的形成。这可能是由于CO杂质中的C通过非保护性的富铌氧化物结核和晶界扩散所致。讨论了625合金氧化结核的形成机理和腐蚀行为，重点讨论了杂质的作用。

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Corrosion and nodule oxide formation mechanism of Alloy 625 in high temperature CO2 environment with impurities

The effect of impurities on the corrosion behavior of Alloy 625 was investigated in CO₂ (0.1 MPa) with a mixture of O₂ and CO impurities at 600 °C for 500 h. A very thin and dense chromia scale was developed on the surface without any significant oxide layer failure. In addition, Nb-rich nodule oxides were developed on the surface after exposure to all the environmental conditions. The crack formation was seen on the nodule oxides due to the oxide growth stress. The XRD results showed the predominant Cr-rich oxides and other phases Ni₃Mo and γ-Ni₃Al on the corroded alloy surface. A specimen exposed to CO₂+O₂ condition shows less oxidation due to the development of dense and compact Cr₂O₃. The carbon deposits were not observed at the oxide-metal interface. However, carbide formation was noticed in the subsurface below the nodule oxide for the specimen corroded in CO₂+CO condition. This may be attributed to the diffusion of C from the CO impurity through the non-protective Nb-rich nodule oxide and grain boundaries. The mechanism of nodule oxide formation and the corrosion behavior of Alloy 625 were discussed focusing on the role of impurities.

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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.