Electrochemical Preparation And Study On Properties Of Super-hydrophobic Anti-scaling Coating

With the rapid development of industry,corrosion and scaling seriously affect the efficiency of industrial production and increase energy consumption,resulting in national economic losses.The traditional solutions mainly include adding scale inhibitor and painting protective coating on the easy scaling surface.However,the large-scale use of scale inhibitors will cause environmental pollution and the anti-scaling effect of protective coating is not good enough.Superhydrophobic coating has nano-structure and the property of low surface energy,which can generate a layer of gas film around the coating and isolate pollutants.This paper combines scale inhibitor with superhydrophobic coating and successfully prepares superhydrophobic coating containing scale inhibitor on the metal surface by using anodic oxidation method.The paper has studied the properties of coating,such as superhydrophobic,antiscaling and anticorrosion.The main contents of the paper can be summarized as follows:?1?The titanium sheets were made into TiO₂NTs by anodic oxidation method and then calcined at 700?for preparation of crystal TiO₂NTs coating.Then,DTPMPA and materials with low surface energy were painted on the surface of TiO₂NTs successively to obtain TiO₂NTs/DTPMPA superhydrophobic coating.Under optimal conditions,the hydrophobic angle and rolling angle of TiO₂NTs/DTPMPA superhydrophobic coating were?151.4±1.6?°and?3±1.3?°.The scaling performance test indicates the TiO₂NTs/DTPMPA superhydrophobic coating has excellent anti-scaling property.Its scaling rate is 15.9%of TiO₂NTs coating.?2?The aluminum oxide layer with porous structure was prepared on the surface of aluminum plate by anodic oxidation method,and DTPMPA was injected into the nano-pore by vacuum compression method.Then,it was modified by fluorination to make it hydrophobic,and DTPMPA superhydrophobic coating was obtained.Under optimal conditions,the hydrophobic angle and rolling angle of superhydrophobic coating were?150±1.5?°and?2±0.8?°.DTPMPA superhydrophobic coating has good hydrophobic durability,and its hydrophobic angle can still reach?137±1?°after soaking in calcium carbonate saturated solution for a period of time.At the same time,the scaling performance test shows that the DTPMPA superhydrophobic coating has extraordinary antiscaling property and its scaling induction time is 96 h and its scaling rate is 17.0%of superhydrophobic coating and 10.3%of aluminum oxide coating.The potentiodynamic polarization curve manifests the coating also has good anticorrosive property.?3?The aluminum oxide layer with porous structure was prepared on the aluminum plate by anodic oxidation method,and DTPMPA was injected into the nano-pore by vacuum compression.Dopamine and Tris-HCl were used as linkers to coat GO on the surface of porous aluminum oxide.Then,it was modified by fluorination to prepare DTPMPA/GO superhydrophobic coating.Under optimal conditions,the hydrophobic angle is as high as?151.2±1.1?°,and the rolling angle is as low as?1.8±0.7?°.The self-cleaning test illustrates that DTPMPA/GO superhydrophobic coating has excellent self-cleaning performance.It can still maintain clean surface after dipping in slurry for 200 times.This kind of coating also has excellent antiscaling property,and the scaling induction time is 25 h and its scaling rate is 59.4%of GO/DTPMPA superhydrophobic coating and 19.7%of hydrophilic coating.The property of coating has been improved by adding GO.