Fabrication And Anti-Corrosion Research Of Super-Hydrophobic Film On Copper Alloys

Super-hydrophobic film is a new and promosing solution to serious corrosion of copper alloys in the marine environment. In this work, super-hydrophobic film has been fabricated by different pretreatment (etching and anodizing) and self-assembly. The corrosion behaviors of the as-pretreated substrates in simulated seawater were studied.Super-hydrophobic film on brass was fabricated by a chemical etching and self-assembling process, too. The properties of the film including surface structure and morphologies were analyzed by the scanning electron microscopy (SEM), Fourier Transform Infrared Spectroscopy (FTIR), contact angle measurement, and electrochemical test techniques. The optimal super-hydrophobic surface was obtained by dipping the substrate into9%(w) FeCl3mixed with0.33%(v) HC1for45minutes and followed with0.1mol/L stearic acid ethanol solution for1day. The corrosion resistance of the as-pretreated brass in seawater was greatly improved by the super-hydrophobic film, with an inhibition efficiency up to97.3%in simulated seawater.Super-hydrophobic film on brass substrates was successfully by H2O2etching and self-assembly. The structure, morphology, composition, wettability and corrosion resistance properties of the film were characterized by means of the scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), contact angle measurement and electrochemical test. The optimal super-hydrophobic surface was obtained by dipping the substrate into1%(w) H2O2mixed with0.1%(v) HCl for60minutes and followed with0.1mol/L stearic acid ethanol solution for1day. The corrosion resistance of the as-pretreated brass in seawater was greatly improved by the super-hydrophobic film. And the inhibition efficiency arrived to99%in simulated seawater.A self-assemble monolayer of alkanethiol has been fabricated on anodized brass substrates. The structure, morphology, composition, wettability and corrosion resistance properties of the super-hydrophobic film were characterized by means of the scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), contact angle measurement and electrochemical test. The results indicated that anodizing as surface pretreatment played a vital role in preparing the SAMs. The optimal assemble time for anodized brass substrates was4h in10mmol/L solution, and the inhibition efficiency had arrived to99.4%in simulated seawater.Super-hydrophobic film has been successfully fabricated on Cu-Ni alloy (B30) substrates by FeCl3etching and stearic acid self-assembly. The properties of the film including surface structure and morphologies were analyzed by the scanning electron microscopy (SEM), Fourier Transform Infrared Spectroscopy (FTIR), contact angle measurement, and electrochemical test. The optimal super-hydrophobic surface was obtained by dipping the substrate into20%(w) FeCl3mixed with0.33%(v) HCl for45minutes and followed with0.1mol/L stearic acid ethanol solution for1day. The corrosion resistance of B30in seawater could greatly improved by the super-hydrophobic film (contact angle=152.8°), and the inhibition efficiency was96.1%in simulated seawater.The results showed that super-hydrophobic film has good inhibition effect for the corrosion of copper alloys in simulated seawater. It would be able to a wide range of application with good durability, stability and adhesion in the furture.