| XING Shuang,ZHANG Min,YANG Jia,LI Xiu-hua,GAO Yue,LI Ya-ze,LI Si-yu,WANG Zhen.#$NP Effect of CuSO4 Concentration and Reaction Time on the Thermal Control Performance of PEO Coatings on LA103Z Mg-Li Alloy[J],52(1):285-297 |
| #$NP Effect of CuSO4 Concentration and Reaction Time on the Thermal Control Performance of PEO Coatings on LA103Z Mg-Li Alloy |
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| DOI：10.16490/j.cnki.issn.1001-3660.2023.01.029 |
| KeyWord:CuSO4 plasma electrolytic oxidation thermal control coating LA103Z Mg-Li alloy chroma value black ceramic coatings |
| Author | Institution |
| XING Shuang |
School of Physics and Electronic Technology, Liaoning Normal University, Liaoning Dalian , China |
| ZHANG Min |
School of Physics and Electronic Technology, Liaoning Normal University, Liaoning Dalian , China |
| YANG Jia |
School of Physics and Electronic Technology, Liaoning Normal University, Liaoning Dalian , China |
| LI Xiu-hua |
School of Physics and Electronic Technology, Liaoning Normal University, Liaoning Dalian , China |
| GAO Yue |
School of Physics and Electronic Technology, Liaoning Normal University, Liaoning Dalian , China |
| LI Ya-ze |
School of Physics and Electronic Technology, Liaoning Normal University, Liaoning Dalian , China |
| LI Si-yu |
School of Physics and Electronic Technology, Liaoning Normal University, Liaoning Dalian , China |
| WANG Zhen |
School of Physics and Electronic Technology, Liaoning Normal University, Liaoning Dalian , China |
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| Abstract: |
| In this work, the black ceramic coatings with high absorption and high emission were grown in situ on the surface of LA103Z magnesium-lithium alloy. The influences of CuSO4 concentration and reaction time on the thermal protection performance of the coatings were studied, and the relationship between the chromaticity value of the coating and its thermal control performance was established. Using plasma electrolytic oxidation technology (PEO), in Na2SiO3 electrolyte system, the coating performance was optimized by adjusting CuSO4 concentration and reaction time. The composition and microstructure of the coatings were determined by using scanning electron microscopy (SEM), X-ray photoelectron spectrometer (XPS), X-ray diffraction (XRD), CIE color system and energy spectrometer (EDS). The thermal control performance of the coatings was investigated by using the Perkin Elmer Lambda ultraviolet-visible near infrared spectrophotometer and TEMP 2000 solar absorption reflectometer. The coatings prepared were mainly composed with MgO and Mg2SiO4 phases. The copper-related compounds, lithium crystalline substances and sodium salts in the coatings all exist in amorphous form. With the increasing of reaction time and CuSO4 concentration, the intensity of diffraction peaks for crystalline phase MgO and Mg2SiO4 in the coatings increased, and that of the matrix Li0.92Mg4.08 decreased. The reason is that the ceramic coatings became thicker. And the position of MgO peak at 42.916° is slightly shifted to the right relative to the standard peak position. The lattice parameter and cell volume corresponding to the (200), (220) and (222) planes of MgO phase increase. The main elements of the PEO coatings are Mg, O, Si, Na, Cu, and the Cu content increases with the increase of CuSO4 concentration. XPS results show that copper exists in the form of monovalent and bivalent ion, indicating that amorphous Cu2O and CuO exist in the coatings. The PEO coatings have a typical porous crater-like structure, with a slight prominent terrace around the pores. The coating is tightly adherent to the substrate without cracks, indicating a higher adhesion force. The number and porosity of micro pores increased with the increase of CuSO4 concentration, but decreased with the prolongation of the reaction time. With the increasing of reaction time and CuSO4 concentration, the thickness and roughness of the coatings increased and the reflectivity decreased (0.25-2.5 μm). The chromaticity value (L) decreased from 81 to 29, and accordingly the coating color gradually transformed from silver gray to light red, finally into black. It is found that the increasing of the thickness and roughness of the PEO coating has a positive effect on the thermal control performance. When the CuSO4 concentration is 1.25 g/L and the reaction time is 20 min, the absorptivity and emissivity of the coating are as high as 0.815 0 and 0.907 2. At this time, the thermal control performance of the coating is the best. Adding CuSO4 into the electrolyte and extending the reaction time appropriately can improve the thermal control performance of the PEO coatings on the surface of LA103Z magnesium lithium alloy, which lays an experimental foundation for the further application of the magnesium-lithium alloy in the aerospace field. |
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