铜表面高疏水薄膜的耐蚀和摩擦学性能研究
首发时间:2017-11-16
摘要:通过在金属铜表面构筑高疏水薄膜改善其在海洋环境中的耐蚀及摩擦学性能。采用简单的化学刻蚀技术及自组装技术在金属铜表面制备高疏水薄膜,表征了薄膜的润湿性,研究了薄膜在海洋环境(以3.5%NaCl水溶液为模拟液)中的耐蚀性能和摩擦学性能。结果表明金属铜经1M氢氧化钠水溶液刻蚀后形成了多尺度的Cu2O表面织构,Cu2O表面织构经硬脂酸修饰后呈现出高疏水特性,表面静态接触角达137 ,滚动角为7 。在3.5%NaCl水溶液中,铜表面高疏水薄膜具有优异的耐蚀性能,这主要是由于表面高疏水薄膜有效隔离含Cl-的溶液与铜表面的接触,阻碍了腐蚀过程中的电荷转移和电极腐蚀,降低了腐蚀速率。摩擦磨损性能的研究发现,在3.5%NaCl溶液下,薄膜能够显著降低摩擦,保护铜基底。
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Corrosion Resistant and Tribological Performance of High-hydrophobic Film on Copper substrate
Abstract:It is important to improve the corrosion-resistant and tribological performance of copper-based materials in sea water. In this paper, the high hydrophobic film on copper substrate were prepared by combining chemical etching and molecular self-assembly techniques. The morphological features, the chemical composition, and hydrophobicity of freshly prepared samples were characterized. Moreover, the corrosion resistant performance and the tribological behavior of the high hydrophobic film on copper were evaluated. It is found that the Cu2O film with special mocro- and nanostructure is firstly created on the copper substrate after chemically etched by using 1M sodium hydroxide solution. The as-fabricated Cu2O surface was then coated by a layer of stearic acid to achieve high hydrophobicity. The resulting surfaces have a water contact angle of 137 and the rolling angle of less than 5 . The high hydrophobic film which prepared on copper substrate has excellent corrosion resistance performance. This is due to the isolation of aggressive Cl- ions from copper surface by high hydrophobic film. It is also found that the friction-reducing and antiwear properties for high hydrophobic film when they are used in dry sliding and in 3.5% NaCl solution. The method is simple and easily operated at large scale. It may provide a new method to improve the corrosion-resistant and tribological performance of copper-based materials in sea water.
Keywords: Copper Hydrophobicity Tribological performance Corrosion resistance
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