Copper Metal Surface Micro/nano Metallic Dendritic Material Fabrication,Wettability And Anticorrosion Capability

The21^st century will see the ocean age. Metal materials act as the crucial rolesduring human beings exploring and utilizing the marine. However, the metalsimmersed in marine environment are enduring the different level of corrosion all thetime, which in turn gives deterioration to the life and activity of mankind. Therefore,the research to metal corrosion and protection is of great importance from boththeoretical and practical background.These years, superhydrophobicity, an extreme wetting phenomenon with contactangle larger than150o, has afforded a promising way for metal anticorrosion. Byusing the air trapped in the micro/nano rough surface on the metal, the corrosionspecies can be blocked from invasion onto the metal surface, so that the corrosion willbe released steadily.In the thesis, we have prepared different metals, alloys and core-shell dendriticstructure by using electrodeposition method. By galvanic replacement reaction, Cudendrites are formed on Zn metal surface. The electrodeposition potential influence tothe crystal morphology has been studied, and the crystal growth mechanism has beendescribed logically. The wettability of the structure has been discussed in detail. Theconclusions are as follows:(1) Transition metals Fe, Co and Cu dendritic structures have been prepared byelectrodeposition method. As the metals belong to different crystal systems, theexternal morphology will behave differently. Fe exhibits one dimensional wirestructure by overlapping triangular pyramids; Co can show flower like morphologyand planar dendritic structure; Cu can exhibit typical planar dendritic structure. Theas-obtained dendritic structure shows superhydrophilicity. After long chain organicacid modification on the surface, the dendritic structures will have thesuperhydrophobicity wettability.(2) Cu alloys (CuNi,CuCo,CuFe), as well as Co@Cu core-shell structure havebeen prepared by electrodeposition method. Their wettability is same to Fe, Co andCu dendritic structure. After long chain organic acid modification on the surface, the dendritic structures show superhydrophobicity wettability.(3) Carbon fiber material is a promising candidate to behave superhydrophobicity.Taking Zn as an example, carbon fiber grows onto its surface with the catalysis effectof Cu dendrites. By measuring the contact angle, it is shown that the as-grown carbonfiber exhibits excellent superhydrophobic wettability. The open circuit potential andpolarization curve measurements show that the material has good anticorrosioncapability, which enables its further practical application.