| HE Xing,KONG De-jun,SONG Ren-guo.Effect of Scanning Speed on Microstructures and Properties of Laser Cladding Al-Ni-TiC-CeO2 Composite Coatings[J],48(3):155-162 |
| Effect of Scanning Speed on Microstructures and Properties of Laser Cladding Al-Ni-TiC-CeO2 Composite Coatings |
| Received:June 15, 2018 Revised:March 20, 2019 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2019.03.022 |
| KeyWord:laser cladding scanning speed Al-Ni-TiC-CeO2 composite coating microstructure property |
| Author | Institution |
| HE Xing |
a.School of Materials Science and Engineering, b.Jiangsu Key Laboratory of Materials Surface Science and Technology, Changzhou University, Changzhou , China |
| KONG De-jun |
b.Jiangsu Key Laboratory of Materials Surface Science and Technology, c.School of Mechanical Engineering, Changzhou University, Changzhou , China |
| SONG Ren-guo |
a.School of Materials Science and Engineering, b.Jiangsu Key Laboratory of Materials Surface Science and Technology, Changzhou University, Changzhou , China |
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| Abstract: |
| The work aims to solve the corrosion and wear of S355 offshore steel caused by the marine environment and prepare excellent coating structure to prolong the service life. Al-Ni-TiC-CeO2 composite coatings was prepared on S355 offshore steel by laser cladding technique and the effect of scanning speed on the microstructure and properties of the coating was studied. Microstructure morphology of coatings was observed with scanning electron microscope and phase of the coatings was analyzed by X-ray diffractometer. The hardness, wear resistance and corrosion resistance of coating were tested and analyzed by micro-hardness tester, friction and wear test machine and electrochemical workstation. The Al-Fe phase appeared in the coatings prepared by different scanning speeds and the coating showed a good metallurgical bonding with the substrate. With the increase of the scanning speed, the thickness of the coating gradually decreased. The microstructure of the coating was transformed from a short rod-like structure to granular structure. The pores, cracks and coating dilution rate gradually decreased. The surface hardness of the coating reached the maximum value of 846.6 HV0.2. The minimum wear width and wear depth was 449.4 and 15.5 μm, respectively. The wear rate was reduced to a minimum of 3.88×10–6 mm3/(N?s). The maximum corrosion potential of the coating was –0.603 96 V, the minimum corrosion current density was 2.3753×10–8 A/cm2, the maximum impedance can reached 2.5 kΩ, and the minimum corrosion rate of the coating was 0.0725 mm/a, which was about 33.6 percent that of the substrate. Al-Ni-TiC-CeO2 coatings on S355 offshore steel by laser cladding can effectively improve wear resistance and corrosion resistance of the coatings. When the scanning speed reaches 7.5 mm/s, the performance of the coating is the best. |
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