| Stainless steel materials are widely used in seawater desalination and medical machinery,but stainless steel is prone to pitting corrosion in corrosive anions,especially Cl-solutions,resulting in damage or even scrapp ing of the device.Therefore,it is particularly important to improve the corrosion resistance of stainless steel.Nano-carbon film has excellent chemical stability,good hydrophobicity and thermal conductivity,and is widely used in corrosion protection of materials.In this paper,plasma enhanced chemical vapor deposition?PECVD?was used to grow nano-carbon films in situ on stainless steel surface.The effects of process parameters on the morphology and structure of nano-carbon films were investigated,and the growth mechanism was analyzed.The corrosion resistance of nano-carbon film on stainless steel surface was studied,and its corrosion resistance mechanism was revealed.In this paper,vertical graphene film?VFG?and carbon nanotube film?CNT?were grown in situ on the surface of stainless steel by PECVD.By optimizing the process parameters,the growth temperature is 650°C,the gas pressure is 500 Pa,the Ar:CH4 gas flow ratio is 50:20,and the growth time is 1 hour.The in-situ growth vertical graphene film on the stainless steel surface has the best density;the growth temperature is 650°C.The gas pressure is 500 Pa,the Ar:CH4 gas flow ratio is 50:10,and the growth time is 1 hour.The uniformity and density of the carbon nanotube film grown on the stainless steel surface are optimal.SS316L-VFG has a wetting angle of 136.6°.The electrochemical test has a corrosion rate of 2.6×10-2 mm/year.Compared with stainless steel,the wetting angle is only 75.0°,the corrosion rate is2.1×10-1 mm/year,and the vertical graphene film Better hydrophobicity and an increase in corrosion rate by an order of magnitude.SS316L-VFG has a wetting angle of 152.2°and a superhydrophobic surface with a corrosion rate of 1.4×10-2mm/year.The experimental results show that the prepared stainless steel surface carbon nanotube film has better corrosion resistance than the vertical graphene film. |
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