Elucidating the Electrochemical Polishing Mechanism of Wrought Ni Superalloy Hastelloy X in a NaCl-Glycol Solution

IF 3.9 2区 化学 Q2 CHEMISTRY, MULTIDISCIPLINARY
Shida Zhang, Yingyue Yin*, Shuaihang Pan*, Wenyu Liu, Weiguang Su, Xianfu Liu, Jianhua Zhang and Fulan Wei*, 
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Abstract

Electrochemical polishing (ECP) has been conducted in a novel, environmentally friendly deep eutectic solvent (DES) electrolyte of NaCl-glycol to remarkably improve the polishing efficiency and significantly reduce localized corrosion regions of the wrought nickel (Ni)-based superalloy Hastelloy X (HX). Critical secondary passivation behavior has been systematically investigated in the DES electrolyte, combining advanced characterization techniques of electrochemical polarization, electrochemical impedance spectroscopy (EIS), X-ray photoelectron spectroscopy (XPS), atomic force microscopy (AFM), and scanning electron microscopy (SEM). The ECP performance in the DES electrolyte was compared to that of the NaCl aqueous solution. The samples’ surface roughness (Ra) decreased from 2.40 ± 0.10 μm to 0.23 ± 0.10 μm (at low current density) and 0.36 ± 0.10 μm (at high current density) in DES solution following ECP, respectively. The surface hardness slightly changed from 234.10 ± 2.30 HV to 226.70 ± 2.50 HV and 224.20 ± 2.50 HV in DES solution after ECP at corresponding low and high current density, primarily attributed to residual stress relief. A qualitative model was developed to relate electrolyte characteristics to polishing surface evolution, providing insights into the design of green ECP processes for aerospace-grade superalloys.

Abstract Image

形变Ni高温合金哈氏合金X在nacl -乙二醇溶液中的电化学抛光机理研究。
在一种新型、环保的深共晶溶剂(DES) nacl -乙二醇电解质中进行电化学抛光(ECP),显著提高了抛光效率,并显著减少了变形镍基高温合金哈氏合金X (HX)的局部腐蚀区域。结合电化学极化、电化学阻抗谱(EIS)、x射线光电子能谱(XPS)、原子力显微镜(AFM)和扫描电子显微镜(SEM)等先进表征技术,系统地研究了DES电解质的临界二次钝化行为。比较了DES电解质与NaCl水溶液的ECP性能。ECP处理后,样品表面粗糙度(Ra)分别从2.40±0.10 μm(低电流密度)和0.36±0.10 μm(高电流密度)下降到0.23±0.10 μm。在相应的低电流密度和高电流密度下,ECP后DES溶液中的表面硬度从234.10±2.30 HV略微变化到226.70±2.50 HV和224.20±2.50 HV,这主要是由于残余应力的消除。建立了一个定性模型,将电解质特性与抛光表面演变联系起来,为航空级高温合金绿色ECP工艺的设计提供了见解。
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来源期刊
Langmuir
Langmuir 化学-材料科学:综合
CiteScore
6.50
自引率
10.30%
发文量
1464
审稿时长
2.1 months
期刊介绍: Langmuir is an interdisciplinary journal publishing articles in the following subject categories: Colloids: surfactants and self-assembly, dispersions, emulsions, foams Interfaces: adsorption, reactions, films, forces Biological Interfaces: biocolloids, biomolecular and biomimetic materials Materials: nano- and mesostructured materials, polymers, gels, liquid crystals Electrochemistry: interfacial charge transfer, charge transport, electrocatalysis, electrokinetic phenomena, bioelectrochemistry Devices and Applications: sensors, fluidics, patterning, catalysis, photonic crystals However, when high-impact, original work is submitted that does not fit within the above categories, decisions to accept or decline such papers will be based on one criteria: What Would Irving Do? Langmuir ranks #2 in citations out of 136 journals in the category of Physical Chemistry with 113,157 total citations. The journal received an Impact Factor of 4.384*. This journal is also indexed in the categories of Materials Science (ranked #1) and Multidisciplinary Chemistry (ranked #5).
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