Pt改性共晶高熵合金AlCoCrFeNi2.1 热腐蚀行为研究

doi:10.11902/1005.4537.2024.134

中国腐蚀与防护学报

2025, Vol. 45

Issue (1): 115-126 CSTR: 32134.14.1005.4537.2024.134 DOI: 10.11902/1005.4537.2024.134

研究报告

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Pt改性共晶高熵合金AlCoCrFeNi_2.1 热腐蚀行为研究

黄勤英, 李彧卓, 阳颖飞, 任盼(

), 王启伟

暨南大学化学与材料学院广州 510632

Hot Corrosion Behavior of Pt Modified AlCoCrFeNi_2.1 Eutectic High Entropy Alloy

HUANG Qinying, LI Yuzhuo, YANG Yingfei, REN Pan(

), WANG Qiwei

School of Chemistry and Materials, Jinan University, Guangzhou 510632, China

引用本文:

黄勤英, 李彧卓, 阳颖飞, 任盼, 王启伟. Pt改性共晶高熵合金AlCoCrFeNi_2.1 热腐蚀行为研究[J]. 中国腐蚀与防护学报, 2025, 45(1): 115-126.
Qinying HUANG, Yuzhuo LI, Yingfei YANG, Pan REN, Qiwei WANG. Hot Corrosion Behavior of Pt Modified AlCoCrFeNi_2.1 Eutectic High Entropy Alloy[J]. Journal of Chinese Society for Corrosion and protection, 2025, 45(1): 115-126.

全文: PDF(30416 KB) HTML

摘要:

采用真空电弧熔炼、电镀Pt和扩散渗Pt的方法制备了YHf-AlCoCrFeNi_2.1 (YHf-EHEA)和YHfPtAlCoCrFeNi_2.1 (YHfPt-EHEA)两种共晶高熵合金。将两种合金放置于800 ℃ Na₂SO₄/K₂SO₄ (质量分数75%∶25%)和900 ℃的Na₂SO₄/NaCl (质量分数75%∶25%)混合盐气氛中进行了热腐蚀实验，并通过XRD、SEM和EPMA等方法研究两种样品的热腐蚀机制。结果表明：在800 ℃的Na₂SO₄/K₂SO₄热腐蚀作用下，YHf-EHEA表面的氧化膜出现大面积剥落，而YHfPt-EHEA表面氧化膜完整，展现出优异的抗腐蚀能力。在900 ℃的Na₂SO₄/NaCl混合盐环境中，O和S向YHf-EHEA内快速扩散，并在合金内形成大量的氧化物和硫化物，加速了氧化膜的开裂和剥落行为。YHfPt-EHEA中Pt的存在减缓了S向合金内的扩散，抑制了合金的热腐蚀行为。

关键词 ：热腐蚀, 共晶高熵合金, 活性元素, Pt改性

Abstract：

Eutectic high-entropy alloy, YHf-AlCoCrFeNi_2.1 (YHf-EHEA) was prepared using vacuum arc melting, and then the YHf-EHEA was surface modified via Pt electroplating and followed by a diffusion treatment at 1080 ^oC also in vacuum, then after, the Pt-modified alloy maned as YHfPtAlCoCrFeNi_2.1 (YHfPt-EHEA). Afterwards, the hot corrosion behavior of the two EHEAs in mixed salts Na₂SO₄/K₂SO₄ (mass fraction 75%:25%) at 800 ^oC and Na₂SO₄/NaCl (mass fraction 75%:25%) at 900 ^oC respectively was assessed by means of XRD, SEM and EPMA. The results indicate that the oxide scale formed on YHf-EHEA peeled off in a large area due to hot corrosion in Na₂SO₄/K₂SO₄ at 800 ^oC, while the oxide scale formed on YHfPt-EHEA remains intact and continuous in the same hot corrosion situation. During hot corrosion in Na₂SO₄/NaCl mixed salt at 900 ^oC, O and S diffuse rapidly into YHf-EHEA and form a number of oxides and sulfides within the alloy, which accelerate the cracking and peeling behavior of oxide scale. In contrast, after being Pt-modified the YHfPt-EHEA exhibits significant inhibition effect to the inward diffusion of O and S into the alloy, and therewith suppresses the hot corrosion process.

Key words： hot corrosion eutectic high-entropy alloys reactive element Pt modification

收稿日期: 2024-04-24 32134.14.1005.4537.2024.134

ZTFLH:

TG174

基金资助:广州市基础与应用基础研究基金(202201010206)

通讯作者: 任盼，E-mail：renpan@jnu.edu.cn，研究方向为金属腐蚀与防护

Corresponding author: REN Pan, E-mail: renpan@jnu.edu.cn

作者简介: 黄勤英，女，1997年生，硕士生

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图1 YHf-EHEA和YHfPt-EHEA样品原始组织和形貌

图2 两种样品在800 ℃下混合盐(Na2SO4 + K2SO4)中热腐蚀200 h的质量变化曲线及XRD谱

图3 两种样品在800 ℃下混合盐(Na2SO4 + K2SO4)中热腐蚀200 h后的表面氧化膜形貌

图4 两种EHEA在800 ℃下混合盐(Na2SO4 + K2SO4)中热腐蚀200 h后的截面形貌

图5 两种样品在800 ℃下混合盐(Na2SO4 + K2SO4)中热腐蚀200 h的截面元素分布

图6 两种EHEA在900 ℃下混合盐(Na2SO4 + NaCl)中热腐蚀20 h的XRD谱

图7 两种EHEA在900 ℃下混合盐(Na2SO4 + NaCl)中热腐蚀20 h后宏观表面

图8 两种EHEA在900 ℃下混合盐(Na2SO4 + NaCl)中热腐蚀20 h后的表面氧化膜形貌

图9 两种EHEA在900 ℃下混合盐(Na2SO4 + NaCl)中热腐蚀20 h 后的截面形貌

图10 两种样品在900 ℃下混合盐(Na2SO4 + NaCl)中热腐蚀20 h的截面元素分布图

图11 两种样品在900 ℃下混合盐(Na2SO4 + NaCl)中热腐蚀100 h的形貌

图12 两种共晶高熵合金热腐蚀机理示意图

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