大气压等离子体射流改性船体钢表面亲水性研究

在室温下,采用大气压等离子体射流对船体钢进行表面改性,通过水接触角测量、扫描电镜、X射线光电子能谱等分析测试方法研究了等离子体射流处理前后船体钢表面润湿性、表面形貌及化学特性的变化。研究结果表明,船体钢经大气压空气等离子体射流处理后在其表面引入了大量含氧基团,处理2s表面的水接触角就可以降到30°以下;处理后材料表面的亲水性受处理时间及放电电流的影响且在空气中放置时会出现老化效应,处理时间越长,老化效应越弱。

Hydrophilicity Improvement of Hull Steel by Plasma Sputtering under Ambient Conditions

The surfaces of hull steel were modified with a high pressure plasma jet under ambient conditions,i.e.in air and at room temperature.The influence of the surface modification conditions,including the discharge current,plasma sputtering time,separation between the jet-nozzle and surface and the sputtering angle,on the morphologies,properties and compositions of the modified surfaces were studied.The modified surfaces and the control surfaces were characterized with scanning electron microscopy and X-ray photoelectron spectroscopy.The results show that the surface modification significantly improves the hydrophilicity of the hull steel.For instance,the water contact angle decreased to below 30° after the air plasma sputtering for 2 s,possibly because the plasma generated a large density of oxygen functions groups on the surface.We found that the hydrophilicity deteriorates in long-time storage,i.e.the ageing effect;and the longer the plasma sputtering time,the weaker the ageing effect.