表面状态与时效对铝表面润湿性的影响

摘要

先用2 mol/L盐酸溶液对高纯铝表面进行化学刻蚀,再依次在200、300和400℃下各时效1h.研究了刻蚀时间和时效处理对试样表面微观组织、成分和水接触角的影响.对比了在不同温度下时效处理后刻蚀试样中部及边界表面形貌和水接触角的差别.结果表明:随刻蚀时间延长,高纯铝表面逐渐产生微米级台阶状结构,当刻蚀时间≥8 min后,高纯铝的表面水接触角由初始的40°降至10°以下,即转变为超亲水状态.当蚀刻试样在200℃下时效处理1h后,表面由超亲水转变为亲水,继续在300℃和400℃下各时效1h后,试样表面恢复超亲水性状态.%The surface of highly pure aluminum was chemically etched with a 2 mol/L HCl solution followed by aging at 200,300 and 400 ℃ respectively for 1 h.The effects of etching time and aging treatment on the microstructure,composition and water contact angle of aluminum surface were studied.The differences of surface morphology and water contact angle at center and boundary of etched aluminum after aging at different temperatures were compared.The results showed that a micron step-shaped structure is gradually formed on the aluminum surface with the extending of etching time.The water contact angle of the aluminum surface is decreased from 40° initially to 10° or below when being etched for more than 8 min,indicating that it is transformed to be superhydrophilic.The surface of etched aluminum is transformed from superhydrophilic to hydrophilic after aging at 200 ℃ for 1 h,and returned to superhydrophilic when aging is continued at 300 ℃ and 400 ℃ respectively for 1 h.