铝含量对镍铝合金在稀硫酸溶液中的腐蚀行为影响

doi:10.11902/1005.4537.2024.041

中国腐蚀与防护学报

2024, Vol. 44

Issue (4): 1011-1021 CSTR: 32134.14.1005.4537.2024.041 DOI: 10.11902/1005.4537.2024.041

轻质合金腐蚀与防护专栏

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铝含量对镍铝合金在稀硫酸溶液中的腐蚀行为影响

杜广¹, 芦国强², 邓龙辉¹, 蒋佳宁¹, 曹学强¹(

)

1.武汉理工大学硅酸盐建筑材料国家重点实验室武汉 430070
2.中国航发沈阳黎明航空发动机有限责任公司沈阳 110043

Effect of Aluminum Content on Corrosion Behavior of Ni-Al Alloys in Dilute Sulfuric Acid Solution

DU Guang¹, LU Guoqiang², DENG Longhui¹, JIANG Jianing¹, CAO Xueqiang¹(

)

1. State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan 430070, China
2. AECC Shenyang Liming Aero-Engine Co., Ltd., Shenyang 110043, China

引用本文:

杜广, 芦国强, 邓龙辉, 蒋佳宁, 曹学强. 铝含量对镍铝合金在稀硫酸溶液中的腐蚀行为影响[J]. 中国腐蚀与防护学报, 2024, 44(4): 1011-1021.
Guang DU, Guoqiang LU, Longhui DENG, Jianing JIANG, Xueqiang CAO. Effect of Aluminum Content on Corrosion Behavior of Ni-Al Alloys in Dilute Sulfuric Acid Solution[J]. Journal of Chinese Society for Corrosion and protection, 2024, 44(4): 1011-1021.

全文: PDF(19540 KB) HTML

摘要:

镍基高温合金(NiCrAlY)常用于航空发动机的热端部件。热端部件如燃烧室、导向叶片和动叶片需要热障涂层(TBCs)保护。TBCs由抗氧化的金属粘结层(BC)和起隔热作用的陶瓷层(TC)组成。BC材料也是NiCrAlY合金，其Al和Cr含量比NiCrAlY基体高许多，导致BC的腐蚀电位比基体低53 mV，BC发生电偶腐蚀。本文采用了不同Al含量的NiAl合金，研究Al含量对NiAl合金在稀H₂SO₄中腐蚀行为的影响。研究表明，Ni₉₅Al₅的腐蚀电位最高，腐蚀电流密度最小；Ni₇₅Al₂₅腐蚀电位较低。研究证明，BC中Al含量高是导致BC在自然环境下发生腐蚀的原因。

关键词 ： NiAl合金, 稀硫酸, 电化学行为, 腐蚀产物

Abstract：

Ni-based high-temperature alloys (NiCrAlY) are commonly used in the hot sections of aerospace engines. Hot section components such as combustion chambers, guide vanes, and turbine blades require thermal barrier coatings (TBCs) for protection. TBCs consist of an oxidation-resistant metal bond coat (BC) and a ceramic top coat (TC) that provides thermal insulation. The BC material is also NiCrAlY alloy, with Al and Cr content higher than the substrate Ni-based high-temperature alloys, leading to a 53 mV lower corrosion potential for BC compared to the substrate, therefore, resulting in galvanic couple with the BC. Herein, the influence of different Al contents in NiAl alloys on their corrosion behavior in dilute H₂SO₄, simulating the corrosive environment was studied. The result reveals that Ni₉₅Al₅ exhibits the highest corrosion potential and the lowest corrosion current density, while Ni₇₅Al₂₅ has a lower corrosion potential. The research demonstrates that a high Al content in the BC is the primary cause of corrosion in conditions of natural environment.

Key words： NiAl alloy dilute sulfuric acid electrochemical behavior corrosion product

收稿日期: 2024-01-30 32134.14.1005.4537.2024.041

ZTFLH:

O646.6

基金资助:国家自然科学基金(92060201)

通讯作者: 曹学强，E-mail: xcao@whut.edu.cn，研究方向为热防护涂层

Corresponding author: CAO Xueqiang, E-mail: xcao@whut.edu.cn

作者简介: 杜广，男，1999年生，硕士生

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图1 真空熔炼制备的4种Ni-Al合金SEM背散射电子像

表1 图1中不同区域的化学组成 (molar fraction / %)

图2 真空熔炼制备样品的XRD谱

图3 4种合金样品的动电位极化曲线

表2 4种合金样品极化曲线拟合参数

图4 4种Ni-Al合金样品极化测试后的表面形貌

表3 图4中不同点区域的化学成分 (molar fraction / %)

图5 4种Ni-Al合金样品48 h线性极化电阻测试后的表面形貌

表4 图5中不同区域的平均化学成分 (molar fraction / %)

图6 4种Ni-Al合金样品在1 mol/L H2SO4溶液中浸泡48 h之后的XPS谱

图7 4种Ni-Al合金样品腐蚀不同时间后的电化学阻抗谱

图8 EIS拟合中采用的等效电路模型

图9 4种Ni-Al合金的Eocp和Icorr随浸泡时间的变化曲线

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