| XIAO Ju-peng,YANG Xue-feng,LI Wan-yang,HOU Qi-min.Wear Resistance and Corrosion Resistance of Laser Cladding WC/Co06 Coating on the Piston Rod of Hydraulic Damper[J],52(3):217-227 |
| Wear Resistance and Corrosion Resistance of Laser Cladding WC/Co06 Coating on the Piston Rod of Hydraulic Damper |
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| DOI：10.16490/j.cnki.issn.1001-3660.2023.03.019 |
| KeyWord:hydraulic damper piston rod laser cladding WC/Co06 coating friction and wear salt spray corrosion |
| Author | Institution |
| XIAO Ju-peng |
School of Mechanical Engineering, University of Jinan, Jinan , China |
| YANG Xue-feng |
School of Mechanical Engineering, University of Jinan, Jinan , China |
| LI Wan-yang |
School of Mechanical Engineering, University of Jinan, Jinan , China |
| HOU Qi-min |
School of Mechanical Engineering, University of Jinan, Jinan , China |
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| Abstract: |
| The wear and corrosion resistance of the piston rod surface of the hydraulic damper can be improved by laser cladding technology. In this paper, WC/Co06 coating was prepared on the surface of 42CrMo steel for hydraulic damper piston rod by coaxial powder feeding laser cladding equipment. The effects of WC content on the wear and corrosion resistance of WC/Co06 coating were researched. Before the experiment, the base material was cut to 50 mm×50 mm×10 mm block by WEDM and polished off the surface pollutants with sandpaper. The two selected powders are spherical powders, and the diameter of Co06 powder is 100-150 μm. WC diameter 10-15 μm. Add 5wt.%WC, 10wt.%WC, 15wt.%WC and 20wt.%WC powder to Co06 powder respectively. The laser cladding experiment adopts LATEC-LAM-400s coaxial powder feeding laser cladding equipment. In the process of laser cladding, the laser power 1 200 W, cladding speed 400 mm/min, powder feeding amount 8 L/min and spot diameter 1mm are selected. After the cladding experiment, the sample is cut with a wire cutting machine, and its surface and section are polished. A scanning electron microscope (EDS-2500) was used to observe the surface morphology of the cladding layer. The cross-section of the cladding layer was corroded with aqua regia corrosion solution. The microstructure of each part of the cladding layer was observed by metallographic microscope, detection of phase composition of the cladding layer by X-ray diffractometer, and the microhardness change of the cladding cross-section was analyzed by a digital display hardness instrument (402MVD). The sliding friction and wear test of the samples was carried out by sliding friction and wear tester (RTECMFT-3000). The wear volume was measured by white light interferometer and the wear morphology was observed. YWX/Q-150 salt spray corrosion test chamber was used to carry out the salt spray test, and the corrosion morphology and products of the samples were compared and analyzed. The results show that the surface quality of the cladding layer is good, and the dilution rate is about 5%. A large number of dense equiaxed crystals are formed at the top of the cross-section of the cladding layer. With the increase of WC content, the white network eutectic structure composed of C, Cr and W in the coating increases significantly, and the grey elliptical dendrite structure becomes finer and finer. WC/Co06 coating generates a variety of hard phases such as Cr23C6, Cr7C3, WC and Fe3W3C, which are distributed around the g-Co solid solution to enhance its hardness, wear resistance and corrosion resistance. Among the four groups of cladding layers, the hardness of the cladding layer with 20wt.% WC content (810HV) is the highest, which is 2.95 times that of the substrate (275HV). After the friction wear and salt spray corrosion tests, the wear amount and corrosion weight loss of the cladding coating decreased significantly, and the wear amount and corrosion weight loss of 20wt.% WC cladding coating were the lowest, 54.7% and 21% of the substrate, respectively. WC can improve the hardness, wear, and corrosion resistance of the cladding layer, and the higher the WC content, the more obvious the strengthening effect. The WC/Co06 coating with 20wt.% WC content has better wear and corrosion resistance. |
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