Enhanced pitting resistance of Al-based coating by synergistic passivation effect from different shapes of Ni/Cr powders

IF 2.6 4区化学 Q3 ELECTROCHEMISTRY

Journal of Solid State Electrochemistry Pub Date : 2024-09-06 DOI:10.1007/s10008-024-06058-3

Binkai Yuan, Liuyan Zhang, Zhaokang Han, Luliang Mo, Yiying Zhang, Gengzhe Shen, Qian Lin, Guibin Tan

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Abstract

Cold-sprayed Al-based coatings are widely used in corrosion protection fields, but they are poor in pitting resistance. In order to enhance the pitting resistance of Al-based coatings, dendritic Ni and irregular Cr powders are co-doped into Al powders to prepare Al-Ni–Cr composite coatings by cold spraying. Their structure, composition, and corrosion behavior are characterized by optical microscopy, scanning electron microscopy (SEM), X-ray diffraction (XRD), dynamic potential polarization, and electrochemical impedance spectroscopy. The results show that the Al-Ni-30Cr coating exhibits the best corrosion resistance with high E_pit, small i_corr and i_pass, large R_ct, and superior self-healing ability. The protective corrosion products rapidly form in the early stage of corrosion, which can effectively fill corrosion pits and intrinsic pores in coatings, preventing further penetration of corrosive media and the continuation of auto-catalytic corrosion reaction of Cl⁻ in the pits. The excellent anti-corrosion performance and long service life of the Al-Ni-30Cr coating are attributed to the self-healing ability and the synergistic shielding effect of nickel and chromium.

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不同形状镍/铬粉末的协同钝化效应增强铝基涂层的抗点蚀性能

冷喷涂铝基涂层广泛应用于腐蚀防护领域，但其抗点蚀性能较差。为了提高铝基涂层的抗点蚀性能，在铝粉中共同掺入树枝状镍粉和不规则铬粉，通过冷喷法制备铝-镍-铬复合涂层。通过光学显微镜、扫描电子显微镜（SEM）、X 射线衍射（XRD）、动电位极化和电化学阻抗谱对其结构、成分和腐蚀行为进行了表征。结果表明，Al-Ni-30Cr 涂层具有最佳的耐腐蚀性能，Epit 高，icorr 和 ipass 小，Rct 大，自修复能力强。保护性腐蚀产物在腐蚀初期迅速形成，能有效填充涂层中的腐蚀凹坑和固有孔隙，阻止腐蚀介质的进一步渗透和凹坑中 Cl- 自催化腐蚀反应的继续进行。铝-镍-30-铬涂层优异的防腐蚀性能和较长的使用寿命归功于镍和铬的自修复能力和协同屏蔽效应。

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来源期刊

Journal of Solid State Electrochemistry 工程技术-电化学

CiteScore

4.80

自引率

4.00%

发文量

227

审稿时长

4.1 months

期刊介绍： The Journal of Solid State Electrochemistry is devoted to all aspects of solid-state chemistry and solid-state physics in electrochemistry. The Journal of Solid State Electrochemistry publishes papers on all aspects of electrochemistry of solid compounds, including experimental and theoretical, basic and applied work. It equally publishes papers on the thermodynamics and kinetics of electrochemical reactions if at least one actively participating phase is solid. Also of interest are articles on the transport of ions and electrons in solids whenever these processes are relevant to electrochemical reactions and on the use of solid-state electrochemical reactions in the analysis of solids and their surfaces. The journal covers solid-state electrochemistry and focusses on the following fields: mechanisms of solid-state electrochemical reactions, semiconductor electrochemistry, electrochemical batteries, accumulators and fuel cells, electrochemical mineral leaching, galvanic metal plating, electrochemical potential memory devices, solid-state electrochemical sensors, ion and electron transport in solid materials and polymers, electrocatalysis, photoelectrochemistry, corrosion of solid materials, solid-state electroanalysis, electrochemical machining of materials, electrochromism and electrochromic devices, new electrochemical solid-state synthesis. The Journal of Solid State Electrochemistry makes the professional in research and industry aware of this swift progress and its importance for future developments and success in the above-mentioned fields.