| JI Xiu-lin,GU Peng,WANG Zhen-song,TANG Qiu-yi,LI Ze.Effect of Laser Remelting on Slurry Erosion and Corrosion Properties of Arc-sprayed Fe-based Amorphous-containing Coatings[J],48(4):68-74 |
| Effect of Laser Remelting on Slurry Erosion and Corrosion Properties of Arc-sprayed Fe-based Amorphous-containing Coatings |
| Received:August 31, 2018 Revised:April 20, 2019 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2019.04.010 |
| KeyWord:laser remelting amorphous coating erosion wear corrosion |
| Author | Institution |
| JI Xiu-lin |
1.School of Mechanical and Electrical Engineering, Hohai University, Changzhou , China |
| GU Peng |
1.School of Mechanical and Electrical Engineering, Hohai University, Changzhou , China |
| WANG Zhen-song |
2.School of Mechanical Engineering, Changzhou University, Changzhou , China |
| TANG Qiu-yi |
1.School of Mechanical and Electrical Engineering, Hohai University, Changzhou , China |
| LI Ze |
1.School of Mechanical and Electrical Engineering, Hohai University, Changzhou , China |
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| Abstract: |
| The work aims to improve the slurry erosion wear resistance and corrosion resistance of arc-sprayed Fe-based amorphous-containing coatings. Arc-sprayed Fe-based amorphous-containing coatings were remelted by YAG lasers. The mi-crostructures, slurry erosion wear resistance and corrosion resistance of the remelted coatings were investigated by X-ray, SEM, erosion tester and electrochemical workstation. The arc-sprayed amorphous-containing coating was crystallized after laser re-melting. With the increase of laser power, the amorphous content and the hardness decreased. After laser remelting, the bonding form between the substrate and coating was converted from mechanically occlusion to metallurgical bonding, the density of the remelted coating increased obviously and the structure flaws decreased. Compared with the sprayed coating, the erosion resistance of the 0.3 kW laser remelted coating could be increased by 3 times at 30 degrees of impact angle, and increased by nearly 6 times at 90 degrees of impact angle. The domain mechanism of erosion wear was micro-cutting at low impact angle, while extrusion fractures at high impact angle. However, the erosion resistance of remelted coating decreases with the increase of laser power. At the same time, the corrosion resistance of remelted coating in 3.5% NaCl solution increased as the laser power grew, but the corrosion current density was significantly reduced when compared with that of as-sprayed coating. Laser remelting can not only improve the bonding condition between the substrate and arc-sprayed amorphous amorphous-containing coatings, but also evidently enhance the erosive wear resistance and corrosion resistance at the same time. Therefore, laser remelting is an efficient post treatment process to improve the properties of coatings. |
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