| LI Zhi,LIU Chong-yu,GE Yu-li,SONG Wan-tong,HU De-feng.Effect of Graphene Oxide on Microstructure and Properties of Nano-cermet Composite Coatings[J],52(10):394-402, 421 |
| Effect of Graphene Oxide on Microstructure and Properties of Nano-cermet Composite Coatings |
| Received:August 30, 2022 Revised:February 10, 2023 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2023.10.035 |
| KeyWord:graphene oxide nanoelectrodeposition cermet composite coatings microstructure and property |
| Author | Institution |
| LI Zhi |
College of Mechanical Engineering,Liaoning Dalian , China |
| LIU Chong-yu |
College of Physical Science and Technology, Dalian University, Liaoning Dalian , China |
| GE Yu-li |
College of Mechanical Engineering,Liaoning Dalian , China |
| SONG Wan-tong |
College of Physical Science and Technology, Dalian University, Liaoning Dalian , China |
| HU De-feng |
College of Physical Science and Technology, Dalian University, Liaoning Dalian , China |
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| Abstract: |
| The work aims to improve the hardness, wear resistance and corrosion resistance of the nano metal-ceramic composite coatings. The method was to prepare Ni-TiN-GO composite layers by adding different contents of graphene oxide (GO) to the plating solution and using nanoelectrodeposition on the surface of alloy steel, and characterize and analyze the structure, composition, microhardness, wear resistance and corrosion resistance of the plated layer, to investigate the effect of GO content on its tissue properties and determine the most suitable GO content. The result showed that the most suitable GO content was 0.3 g/L, and the surface of the resulting plating was flat and dense, with good bonding with the substrate, and the thickness was 8.64 μm; The crystalline surface exhibited double selective orientation with the smallest grain size and the largest micro hardness at 22.8 nm and 1 529.1HV respectively, 312.6% increase in hardness compared with the substrate; GO was diffusely distributed in the plating layer, providing numerous nucleation sites and decreasing the grain size of the plating layer. GO could be diffusely distributed in the plating layer to refine the grains. Due to its excellent conductive properties, the deposition rate was increased, resulting in fewer defects, dense plating, and a friction coefficient of 0.8, which significantly enhanced the wear resistance of the plating layer. Mainly based on abrasive wear, with good wear resistance, GO was dispersed as a solid lubricant on the surface of the plating, which prevented direct contact between the friction subsets and made the wear marks significantly weaker. Due to the small size of GO, it could fill in the plating pores, effectively reduce defects, and achieve dense plating. In addition, its larger specific surface area could effectively prevent corrosion ions from entering. The Ni-TiN-0.3g/LGO composite plating self-corrosion current density decreased by an order of magnitude compared with the base and Ni-TiN plating, the corrosion potential of the composite coating was the most positive, –0.710 V, and the self-corrosion current density was also the smallest, 2.24×10–5 A/cm2. After 96 h salt spray test, the plating did not crack and only a small amount of corrosion products were attached, which showed good corrosion resistance. It is concluded that GO can reduce the grain size to achieve the effect of fine grain strengthening, and when the addition of GO is 0.3 g/L, the density of the plating surface is the largest and the defects are reduced. In addition, its larger specific surface area can prevent the passage of corrosion ions, thus improving the corrosion resistance of the plated layer; GO co-deposits to the pore defects by combining with Ni2+ in the plating solution to form a complex. At the same time, GO is diffusely distributed in the plated layer, providing numerous nucleation sites, and the grain size of the plated layer decreases, so that the hardness of the plated layer is improved. The wear resistance of the plating also increases because GO has a certain self-lubricating ability. |
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