Corrosion behavior of low pressure cold sprayed Zn-Ni composite coatings
| Autor: | Xiang Bo Li, Cai Xia Li, Zhen Hua Wang, Guo Sheng Huang, Yan Li, Yang Bai |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
010302 applied physics
Materials science Mechanical Engineering Metallurgy Composite number Metals and Alloys Gas dynamic cold spray chemistry.chemical_element 02 engineering and technology Zinc engineering.material 021001 nanoscience & nanotechnology 01 natural sciences Corrosion Cathodic protection chemistry.chemical_compound chemistry Coating Mechanics of Materials Zinc hydroxide 0103 physical sciences Materials Chemistry engineering 0210 nano-technology Anodic protection |
| Zdroj: | Journal of Alloys and Compounds. 719:194-202 |
| ISSN: | 0925-8388 |
| DOI: | 10.1016/j.jallcom.2017.05.134 |
| Popis: | In this study, Zn-Ni composite coatings with different Ni contents were deposited on low-carbon steel using Low pressure cold spray (LPCS) method. The morphology, element distribution and phase compositions of powders and as-sprayed coatings were analyzed by using scanning electron microscopy, energy dispersive spectrometer and X-ray diffraction respectively. The corrosion protection mechanism of these composite coatings were investigated using electrochemical technique and their corrosion morphologies. The results show that Zn-Ni composite coatings exhibited a better sacrificial anodic protection and physical shielding effect, where the corrosion resistance of the coating with 10 wt% Ni in the feedstock was best. The corrosion products were mainly composed of Zinc hydroxide Zn(OH)2, basic zinc chloride hydrate ZnCl2·4Zn(OH)2·H2O, basic zinc carbonate hydrate Zn4·CO3(OH)6·H2O and the corrosion products is not mixed with alumina. The corrosion process mainly includes active dissolution of zinc, zinc cathodic protection, physical shielding caused by corrosion products. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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