| ZHOU Yi,HU Lin,ZHAO Xing-wang,DENG Jie-wen.Preparation and Characterization of Self-cleaning and High-temperature-resistant Composite Coating on Magnesium Alloy[J],52(5):298-305 |
| Preparation and Characterization of Self-cleaning and High-temperature-resistant Composite Coating on Magnesium Alloy |
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| DOI：10.16490/j.cnki.issn.1001-3660.2023.05.029 |
| KeyWord:magnesium alloy composite coating superhydrophobicity low adhesion self-cleaning high-temperature resistance |
| Author | Institution |
| ZHOU Yi |
AVIC Chengdu Aircraft Industrial Group Co., Ltd., Chengdu , China |
| HU Lin |
Chongqing University, Chongqing , China |
| ZHAO Xing-wang |
Chongqing University, Chongqing , China |
| DENG Jie-wen |
AVIC Chengdu Aircraft Industrial Group Co., Ltd., Chengdu , China |
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| Abstract: |
| The composite coatings with self-cleaning and high-temperature-resistant functions are indispensable for magnesium alloys to widen their application in harsh environments. In this paper, the composite coating that has superhydrophobic and low adhesive characteristics with self-cleaning and high-temperature-resistant functions was prepared on the AZ31 magnesium alloy surface by chemical conversion, boiling-water immersion and stearic-acid modification. The surface morphology of the coating was observed by field emission scanning electron microscopy (FESEM). The chemical composition of the coating was identified by X-ray photoelectron spectroscopy (XPS). The wettability and adhesion of the coating surface to water was evaluated by contact angle measuring instrument (CA) and high-speed camera (HSC). The self-cleaning function of the coating in air and oil (cyclohexane) was measured with chalk powders as the target contaminant. The high- temperature-resistant function of the coating was evaluated by the high-temperature exposure test and boiling-water immersion cycling test. The characterization results indicated that the as-prepared coating was composed of (HYDR) oxides and stearates of Zr and Mg, which presented as partly-filled micro-nets formed by nanofibers. The coating surface had a high static water contact angle of 160.4° and a low roll-off angle of 1°, which indicated that the coating accorded with Cassie-Baxter model and had superhydrophobic and low adhesive characteristics. The coating demonstrated remarkable self-cleaning function in air and oil, and attractive high-temperature-resistant function in air and water. The as-prepared self-cleaning and high-temperature-resistant composite coating in this work is expected to widen the application of magnesium alloys in harsh environments. |
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