Evolution process of the plasma electrolytic oxidation (PEO) coating formed on aluminum in an alkaline sodium hexametaphosphate ((NaPO3)6) electrolyte
| Autor: | Guo-rui Wu, Hui-ping Han, Dong-dong Wang, Xin-tong Liu, X.Y. Zhang, Yu Su, Dejiu Shen, Zhong Yang, Ye-kang Wu |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
Scanning electron microscope Mechanical Engineering technology industry and agriculture Metals and Alloys 02 engineering and technology Substrate (electronics) Electrolyte Plasma electrolytic oxidation engineering.material 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Sodium hexametaphosphate chemistry.chemical_compound chemistry Chemical engineering X-ray photoelectron spectroscopy Coating Mechanics of Materials Materials Chemistry engineering 0210 nano-technology Diffractometer |
| Zdroj: | Journal of Alloys and Compounds. 798:129-143 |
| ISSN: | 0925-8388 |
| DOI: | 10.1016/j.jallcom.2019.05.253 |
| Popis: | A plasma electrolytic oxidation (PEO) coating was fabricated on AA1060 alloy in an alkaline sodium hexametaphosphate ((NaPO3)6) electrolyte. The growth characteristic of the PEO coating was investigated by means of a substrate-detachment technique, Scanning electron microscope (SEM) equipped with energy dispersive spectrometry (EDS), X-ray photoelectron spectrometer (XPS), X-ray diffractometer (XRD) and Mott-Schottky analysis. The results showed that an ordered and porous anodic aluminum oxide (AAO) film was formed at the anodic oxidation stage by the influence of (NaPO3)6 in the electrolyte, and the microstructure of the AAO film induced the plasma discharge events to initiate inside the AAO film. The Mott-Schottky analysis showed that the PEO coated samples were all represented n-type semiconducting behavior. The microstructures of detached coatings showed that the coating/substrate interfaces formed at the anodic oxidation stage and sparking stage consist of numerous hemispherical cap structures, but with different sizes. It was also revealed that the inward growth of the hemispherical cap structures is dependent on the diffusion of oxygen from the electrolyte or plasma gases to substrate, and P atoms mainly exist in the amorphous phase of the PEO coating. |
| Databáze: | OpenAIRE |
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