Corrosion resistance phosphate coating formed by steam assisted curing on cast Al Si alloy
| Autor: | Deyang Wang, Yinsheng Dong, Xuelin Huang |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
Scanning electron microscope 02 engineering and technology Surfaces and Interfaces General Chemistry engineering.material 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Microstructure 01 natural sciences Dip-coating 0104 chemical sciences Surfaces Coatings and Films Corrosion Dielectric spectroscopy Coating Materials Chemistry engineering Fourier transform infrared spectroscopy Composite material 0210 nano-technology Curing (chemistry) |
| Zdroj: | Surface and Coatings Technology. 382:125242 |
| ISSN: | 0257-8972 |
| Popis: | In this work, a corrosion protection coating of aluminum phosphate (A-P) on cast Al-10% Si alloy was successfully prepared by dip coating and steam assisted curing method. The crystallization properties and microstructures of the A-P coating were determined by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS). The result showed that the coating completely covered on the surface and exhibited excellent interfacial adherence with the substrate. The phase composition of the coating was mainly composed of AlPO4 and AlPO4·1.5H2O. The test results of potentiodynamic polarization, electrochemical impedance spectroscopy (EIS) and the prolonged immersion time in 3.5 wt% NaCl solution revealed that the A-P coating showed a better corrosion resistance than original substrate. Furthermore, the mechanism of deposition and curing reaction of the A-P coating were proposed. |
| Databáze: | OpenAIRE |
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