FeCrAl-1Nb 合金中的 Laves 沉淀在 290 °C 和 7 MPa 下的腐蚀行为：尺寸效应和 pH 值的关键作用

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

Corrosion Science Pub Date : 2024-10-03 DOI:10.1016/j.corsci.2024.112498

Yunhan Hu, Yunhan Ling, Weipeng Wang, Fan Zhao, Zhengjun Zhang

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引用次数: 0

摘要

在 290 °C 和 7 MPa 的四种不同脱氧溶液中研究了铁铬铝铌合金中 Laves 沉淀的腐蚀行为。拉维斯沉淀物在弱碱性溶液中的腐蚀过程中表现出潜在的尺寸效应：微尺度沉淀物在氧化过程中会发生非晶化和元素溶解，而在纳米尺度沉淀物中则观察不到这些现象。纳米级沉淀物的腐蚀对 pH 值的微小变化不太敏感；不过，在一些纳米级沉淀物和铁素体相之间观察到了微电蚀作用。氘同位素标记实验在一些氧化沉淀物中观察到氢富集。

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Corrosion behavior of Laves precipitates in FeCrAl-1Nb alloy at 290 °C and 7 MPa: The size effect and critical role of pH

The corrosion behavior of Laves precipitates in FeCrAl-1Nb alloy was investigated in four different deoxygenated solutions at 290 °C and 7 MPa. The Laves precipitates exhibit potential size effect during corrosion in a weak alkaline solution: the microscale precipitates undergo oxidation with amorphization and element dissolution, and these phenomena are not observed in nanoscale precipitates. The corrosion of nanoscale precipitates is less insensitive to slight changes in pH; however, micro-galvanic corrosion was observed between some nanoscale precipitates and the ferrite phase. Deuterium isotope labeling experiments observed hydrogen enrichment in some oxidized precipitates.

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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.