| JIANG Chao-ping,LIU Wang-qiang.Porosity and Corrosion Resistance of Fe-based Amorphous Coatings Pre-pared by Thermal Spraying[J],46(5):238-243 |
| Porosity and Corrosion Resistance of Fe-based Amorphous Coatings Pre-pared by Thermal Spraying |
| Received:December 16, 2016 Revised:May 20, 2017 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2017.05.038 |
| KeyWord:Fe-based amorphousalloy thermal spraying coating porosity laser remelting corrosion mechanism |
| Author | Institution |
| JIANG Chao-ping |
School of Material Science and Engineering, Chang'an University, Xi'an , China |
| LIU Wang-qiang |
School of Material Science and Engineering, Chang'an University, Xi'an , China |
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| Abstract: |
| Owing to excellent comprehensive performance, especially incomparable advantage in wear and corrosion resistance compared with traditional crystalline materials, thermal sprayed Fe-based amorphous coating is widely used for surface protection. However, as a typical lamellar structure, it has certain amount of pores inside as well, resulting in reduction of its corrosion resistance. Corrosion mechanism of Fe-based amorphous coating and factors influencing its corrosion resistance were first introduced, forming mechanism, classification and influencing factors of thermal sprayed Fe-based amorphous coating were summarized. Then research progress of relationship between pore defects and corrosion resistance of Fe-based amorphous coating was introduced in details. According to analysis of thermal sprayed coating formation process and pore formation mechanism, poor spreading and deformation capabilities of particles had significant effects on mutual embedding and deformability of particles when the coating took shape. Therefore, Fe-based amorphous coating could improve the spreading and deformation capabilities of particles and even compactness of the coating by changing composition of spraying powder, particle size, adding second-phase particle and optimizing spraying process parameters. Remelting the coating microlayer rapidly by adopting laser rapid surface re-melting technology could also reduce the porosity and improve corrosion resistance of the coating. |
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