(1. College of Power Engineering, Naval University of Engineering, Wuhan 430033, China) (2. Teaching and Research Guarantee Center, Naval University of Engineering, Wuhan 430033, China)
Traditional preparation techniques for superhydrophobic surface have their own shortcomings, such as high processing costs, being prone to influence by the accuracy of equipment, high randomicity in morphologies and size. In order to obtain superhydrophobic surface with low cost and relatively controllable microstructure, deposition melting method was proposed. Through the natural deposition of metalparticle suspension, the micro/nano-sized particles can be evenly distributed on the metal surface. Then, the particles are bonded to metal surface by melting and recrystallization. Finally, the superhydrophobic microstructure surface is prepared after being modified by low surface energy polymer. By this method, superhydrophobic microstructure surfaces on brass,NO.45 steel and 6063 aluminum with Sn-Pb alloy particles were produced. It is found that there is no inevitable relationship between metal substrate and hydrophobicity of microstructure surface. However, the smaller the diameter of micro-sized grain is, the greater the hydrophobicity is. Moreover, compared to other traditional methods, deposition melting method can achieve the controllable preparation of microstructure surface. Furthermore, there are several other advantages, such as high processing efficiency, simple process, low cost, and having little influence on the strength of substrate. But, deposition melting method is difficult to apply on surface, which needs to be solved by further research.