Effect of Fe³⁺ ions on the thermal and optical properties of the ceramic coating grown in-situ on AZ31 Mg Alloy

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• 作者：Songtao Lu^a ; Wei Qin^b ; Xiaohong Wu^a ; ^{wuxiaohong@hit.edu.cn} ; Xiaodong Wang^a ; Guimei Zhao^c
• 关键词：Plasma electrolytic oxidation ; Ceramic coatings ; Thermal property ; Optical property
• 刊名：Materials Chemistry and Physics
• 出版年：2012
• 期刊代码：58_02540584
• 类别：ms
• 出版时间：16 July, 2012
• 卷：135
• 期：1
• 页码：58-62
• 文件大小：872 K

摘要

This research investigates the effect of Fe₂(SO₄)₃ on the thermal and optical properties of the ceramic coatings formed on AZ31 Mg alloy. The different ceramic coatings were obtained by plasma electrolytic oxidation (PEO) in electrolytes that contain varied concentrations of Fe₂(SO₄)₃. The microstructure, element distribution, composition as well as the thermal and optical properties of the coatings were studied with scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), X-ray Diffraction (XRD), UV-VIS-NIR spectrophotometer and infrared reflectometer. The results show that all of the coatings prepared were mainly composed with MgO, with trace-amount of Fe₃O₄ presents and Fe seems entered into the MgO crystal structure. With the increasing of the concentration of Fe₂(SO₄)₃, the solar absorptance and infrared emittance increased initially but then remain stable. We found that at the concentrations 8聽g聽L^鈭?, the coating has the highest solar absorptance (0.94) and infrared emittance (0.83). Our results show that coatings formed with this method could be useful as a thermal control coating in a variety of applications, such as in the spacecraft.