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首页> 外文期刊>Journal of Materials Engineering and Performance >Effects of Disodium Phosphate Concentration (Na2HPO4 center dot 2H(2)O) on Microstructure and Corrosion Resistance of Plasma Electrolytic Oxidation (PEO) Coatings on 2024 Al Alloy
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Effects of Disodium Phosphate Concentration (Na2HPO4 center dot 2H(2)O) on Microstructure and Corrosion Resistance of Plasma Electrolytic Oxidation (PEO) Coatings on 2024 Al Alloy

机译：磷酸二钠浓度（Na2HPO4中心点2H（2）o）对2024 Al合金血浆电解氧化（PEO）涂层的微观结构和耐腐蚀性的影响

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摘要

Since the electrolyte composition plays a pivotal role in the microstructure and corrosion behavior of plasma electrolytic oxidation (PEO) coatings, the effects of disodium phosphate (Na2HPO4 center dot 2H(2)O) concentration on the microstructure and corrosion resistance of PEO coatings fabricated on 2024 Al alloy were studied in this investigation. Accordingly, electrolyte with four different concentrations of phosphate ion (5, 10, 15 and 20 g/L) was used. All PEO processes were conducted at constant current density of 15 A/dm(2) for 15 min. The surface and cross-sectional morphologies of the coatings indicated that the coating formed in the electrolyte with 10 g/L Na2HPO4 center dot 2H(2)O (with 9.14 A mu m thickness) had the most compact and uniform structure with the lowest and smallest micropores. Furthermore, studying the corrosion behavior of samples in 3.5 wt.% NaCl stions by electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization tests revealed that the sample coated in the electrolyte with 10 g/L Na2HPO4 center dot 2H(2)O had the highest corrosion potential, the lowest corrosion current density and, accordingly, the best corrosion resistance. The corrosion resistance of this coating was 4.574 x 10(5) a"broken vertical bar cm(2), which could increase the corrosion resistance of uncoated 2024 Al alloy substrate 48 times. The x-ray diffraction pattern of this coating proved that the coating was composed of alpha-Al2O3 and gamma-Al2O3 phases.
机译：由于电解质组合物在血浆电解氧化（PEO）涂层的微观结构和腐蚀行为中起枢转作用，因此磷酸二钠（Na 2 HPO4中心DOT 2H（2）O）浓度对制造的PEO涂层微观结构和耐腐蚀性的影响在这次调查中研究了2024年AL合金。因此，使用具有四种不同浓度磷酸离子（5,10,15和20g / L）的电解质。所有PEO方法以15A / dm（2）的恒定电流密度为15分钟进行。涂层的表面和横截面形态表明，在电解质中形成的涂层用10g / L Na 2 HPO4中心点2H（2）O（厚度为9.14μm，厚度）具有最小的和均匀的结构，最低和最小的微孔。此外，研究了3.5重量％的样品的腐蚀行为。通过电化学阻抗光谱（EIS）和电位偏振试验的腐蚀行为显示，涂覆在电解质中的样品，其中10g / L Na 2 HPO4中心点2H（2）O具有最高的腐蚀电位，最低腐蚀电流密度，因此，最佳耐腐蚀性。该涂层的耐腐蚀性为4.574×10（5 )A“破碎的垂直条Cm（2），这可以提高未涂覆的2024 al合金基材的耐腐蚀性48次。该涂层的X射线衍射图案证明了涂层由α-Al2O3和γ-Al2O3相组成。

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