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Preparation And Corrosion Resistance Of Epoxy Resin-carbon Nanotubes Composite Superhydrophobic Coating

Posted on:2024-03-09Degree:MasterType:Thesis
Country:ChinaCandidate:Z B ZhuFull Text:PDF
GTID:2531307178481834Subject:Materials Science and Engineering
Abstract/Summary:PDF Full Text Request
The superhydrophobic coating can prevent the interaction between metal and corrosive medium in water,thus reducing the corrosion rate of the metal.Therefore,superhydrophobic materials play an essential role in corrosion resistance.With the development of the research,the shortcomings of the poor surface mechanical properties and the more complex preparation process have gradually emerged.It is significant to develop superhydrophobic coatings with a simple process,wide application base,good durability,and low equipment cost.The micro-nano structure of carbon nanotubes can improve the embedding degree with the coating and further improve surface durability.The micro-nano composite structure of low surface energy is designed to control the surface wettability of the coating to improve the corrosion resistance of AH36 carbon steel.HMWCNTs and copper powders are modified,and they bond with each other to prepare CNTs-Cu hybrids.The synthesis principle of modified carbon nanotubes and CNTs-Cu hybrids is analyzed.Then the superhydrophobic coating is prepared by combining them with epoxy resin.The cause of the change in coating wettability is investigated,and the corrosion resistance mechanism of the superhydrophobic coating is studied.The main research results are as follows:(1)Hydroxylated multi-walled carbon nanotubes(HMWCNTs)are modified with isobutyltriethoxysilane and 3-aminopropyltriethoxysilane to make them superhydrophobic,which are mixed with epoxy resin to prepare excellent superhydrophobic siloxane-modified carbon nanotubes/epoxy coating on the surface of AH36 carbon steel.Highly silanized HMWCNTs(HSHMWCNTs)are added to hydrophobic isobutyl groups and amino groups that can bond with epoxy resin.The HSHMWCNTs show superhydrophobicity.The coating has a WCA of 157.2°and a water sliding angle(WSA)of 6°when the addition of the HSHMWCNTs reaches70%.The micro-nano structure with low surface energy conforms to the Cassie model,which gives the coating a self-cleaning performance.The coating remains superhydrophobicity under tape-peeling for 90 times.The air layer on the superhydrophobic surface retards the adhesion and penetration of the corrosion medium,thereby improving the corrosion resistance of the coating.(2)Hydrophobic copper powder is prepared and combined with silanized HMWCNTs(SHMWCNTs)to prepare hybrids of carbon nanotubes and copper powder.There is a siloxane layer on the surface of the hydrophobic copper powder.The siloxane layer is connected to the copper powder by the Cu-S bond.There are fluorocarbon groups and epoxy groups in the hydrophobic copper powders.The hydrophobic copper powders show superhydrophobicity.CNTs-15Cu hybrids are formed under the condition that the mass ratio of SHMWCNTs to hydrophobic copper powder is 1:15.CNTs-15Cu hybrids show superhydrophobicity.The powder is a micron powder with a nanostructure,which can improve the embedding degree of the powder and the polymer resin coating.(3)The anti-biofouling superhydrophobic coatings are prepared by combining CNTs-Cu hybrids with epoxy resin.The doping mass of the CNTs-15Cu is an epoxy resin mass of 150%in the coating,showing a water contact angle of 167.2°,a water sliding angle of 2.9°,and self-cleaning properties.The coating maintains superhydrophobicity after 300 tape-peeling times,exhibiting excellent durability.The fouled area percentages of chlorella on the coating and a pure epoxy resin are0.23(±0.07)%and 12.18(±1.22)%,respectively,displaying anti-biofouling resistances.The coating has excellent corrosion resistance,and its corrosion current density reaches 9.55×10-8A/cm2.
Keywords/Search Tags:Superhydrophobic coating, Modified carbon nanotubes, Hybrids of carbon nanotubes and copper, Corrosion resistance
PDF Full Text Request
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