title: Investigation of absorptance and emissivity of thermal control coatings on Mg-Li alloys and OES analysis during PEO process.
abstract: Thermal control ceramic coatings on Mg-Li alloys have been successfully prepared in silicate electrolyte system by plasma electrolytic oxidation (PEO) method. The PEO coatings are mainly composed of crystallized Mg2SiO4 and MgO, which have typical porous structure with some bulges on the surface; OES analysis shows that the plasma temperature, which is influenced by the technique parameters, determines the formation of the coatings with different crystalline phases and morphologies, combined with "quick cooling effect" by the electrolyte; and the electron concentration is constant, which is related to the electric spark breakdown, determined by the nature of the coating and the interface of coating/electrolyte. Technique parameters influence the coating thickness, roughness and surface morphology, but do not change the coating composition in the specific PEO regime, and therefore the absorptance (αS) and emissivity (ε) of the coatings can be adjusted by the technique parameters through changing thickness and roughness in a certain degree. The coating prepared at 10 A/dm(2), 50 Hz, 30 min and 14 g/L Na2SiO3 has the minimum value of αS (0.35) and the maximum value of ε (0.82), with the balance temperature of 320 K.
authors.affiliation: MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, PR China.
authors.forename: Zhongping
authors.initials: Z
authors.lastname: Yao
authors.affiliation: MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, PR China.
authors.forename: Qixing
authors.initials: Q
authors.lastname: Xia
authors.affiliation: Shanghai Aerospace Equipment Manufacture, Shanghai 200245, PR China.
authors.forename: Pengfei
authors.initials: P
authors.lastname: Ju
authors.affiliation: MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, PR China.
authors.forename: Jiankang
authors.initials: J
authors.lastname: Wang
authors.affiliation: Shanghai Aerospace Equipment Manufacture, Shanghai 200245, PR China.
authors.forename: Peibo
authors.initials: P
authors.lastname: Su
authors.affiliation: MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, PR China.
authors.forename: Dongqi
authors.initials: D
authors.lastname: Li
authors.affiliation: MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, PR China.
authors.forename: Zhaohua
authors.initials: Z
authors.lastname: Jiang