Preparation And Characteristic Analysis Of Superhydrophilic/Superhydrophobic Ni/Nano-Wo3 Composites

The preparation of metal-based self-cleaning surface with high hardness, long service life and wide application is a hot and difficult topic in research at home and abroad. A super-hydrophilic or superhydrophobic selectable Ni/nano-WO3 selfcleaning composite coating was prepared on the metal substrate with nickel as the matrix metal and nanometer tungsten trioxide (WO3) as the functional material by composited electrodeposition. Surface morphology, mechanical properties, surface wettability and photocatalytic properties of the coating were tested by SEM, S-neox 3D optical profiler, EDS and contact angle measurement, respectively. The results show that the surface of the Ni/nano-WO3 composite with 17% WO3 has the morphological feature with micro/nano dual-scale hierarchical structures and superhydrophilic properties, and the ability to photocatalytically degrade of methyl orange solution. It changes to superhydrophobic when it is coated by a layer of fluorination with a contact angle of 156.5 degrees. The electrodeposited composite has a significantly improved anti-wettability and photocatalytic property when it is post-treated by electrochemical etching and fluorination. The as-prepared composite coating has super-hydrophilic or superhydrophobic pron bhh perties, and superior self-cleaning properties such as high hardness, large binding force to metal matrix, and photocatalytic degradation of organic matter.