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Overview of Gas nitriding on the surface of industrial pure iron and laser gas nitriding, research under different nitriding process, the phase, organization and mechanical properties of the nitride layer that is the difference. Plasma sprayed titanium on industrial pure iron surface, the laser nitriding experiments were carried out on the titanium surface. The formation of iron and nitrogen compounds is induced by the combination of titanium nitride. The difference between gas nitriding and laser nitriding is analyzed. The results show that: (1) after gas nitriding, the nitrides formed on the surface of pure iron are mainly ε-Fe2-3N and γ′-Fe4N, the surface hardness is 158 HV, and the increase is 32%. (2) in the 500 W laser power, laser nitriding formed on the surface of Titanium metal layer of pure iron, but not the formation of iron and nitrogen compound, the surface hardness of 168 HV, increased by 46%. (3) under the condition of 500 W laser power, the industrial pure iron was nitrided by laser, without the formation of iron and nitrogen compounds, but the surface hardness of the sample was increased by 20%.

A series of waterborne cationic perfluorinated polyacrylate (WCFPA) were prepared by the reaction of styrene (St), methacrylatoethyl trimethyl ammonium chloride (DMC), butyl acrylate (BA), octadecyl acrylate (ODA) and 2-(perfluorooctyl)ethyl acrylate (FEA) by soap-free emulsion copolymerization and then the films of the WCFPA were prepared. Their structure and water/oil repellency properties, such as surface property, water and chemical resistance of their membrane were characterized by fourier transform infared spectrometer (FT-IR), interfacial tension instrument (IT), contact angle (CA) and spot test. The results reveal that WCFPA was endowed with low surface energy of its film. It was also found that the fluorinated polyacrylate had outstanding water and chemical resistance. Increasing the FEA amount in the emulsion was as sociated with larger contact angle and better water and oil repellency.