首页> 外文期刊>Langmuir: The ACS Journal of Surfaces and Colloids >Rapid Formation of a Superhydrophobic Surface on a Magnesium Alloy Coated with a Cerium Oxide Film by a Simple Immersion Process at Room Temperature and Its Chemical Stability
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Rapid Formation of a Superhydrophobic Surface on a Magnesium Alloy Coated with a Cerium Oxide Film by a Simple Immersion Process at Room Temperature and Its Chemical Stability

机译:在室温下通过简单的浸入法在涂有氧化铈膜的镁合金上快速形成超疏水表面及其化学稳定性

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We have developed a facile, simple, time-saving method of creating a superhydrophobic surface on a magnesium alloy by a simple immersion process at room temperature. First, a crystalline CeO_2 film was vertically formed on the magnesium alloy by immersion in a cerium nitrate aqueous solution for 20 min. The density of the crystals vertically with respect to the magnesium alloy increased with increasing immersion time. Next, the film were covered with fluoroalkylsilane (FAS: CF_3(CF_2)_7CH_2CH_2Si(OCH_3)_3) molecules within 30 min by immersion in a toluene solution containing FAS and tetrakis(trimethylsiloxy)titanium (TTST: (CH_3)_3SiO)_4Ti). TTST was used as a catalyst to promote the hydrolysis and/or polymerization of FAS molecules. The FAS-coated CeO_2 film had a static contact angle of more than 150°, that is, a superhydrophobic property. The shortest processing time for the fabrication of the superhydrophobic surface was 40 min. The contact angle hysteresis decreased with an increase in the immersion time in the cerium nitrate aqueous solution. The chemical stability of the superhydrophobic surface on magnesium alloy AZ31 was investigated. The average static water contact angles of the superhydrophobic surfaces after immersion in the solutions at pH 4, 7, and 10 for 24 h were found to be 139.7 ± 2, 140.0 ± 2, and 145.7 ± 2°, respectively. In addition, the chemical stability of the superhydrophobic surface in the solutions at pH ranging from 1 to 14 was also examined. The superhydrophobic surfaces had static contact angles of more than 142° in the solutions at pH ranging from 1 to 14, showing that our superhydrophobic surface had a high chemical stability. Moreover, the corrosion resistance of the superhydrophobic surface on the magnesium alloy was investigated using electrochemical measurements.
机译:我们已经开发出一种简便,简单,省时的方法,该方法可通过在室温下进行简单的浸渍过程在镁合金上创建超疏水表面。首先,通过将其浸入硝酸铈水溶液中20分钟而在镁合金上垂直形成结晶的CeO_2膜。垂直于镁合金的晶体密度随着浸入时间的增加而增加。接下来,通过将氟烷基硅烷(FAS:CF_3(CF_2)_7CH_2CH_2Si(OCH_3)_3)分子浸入含有FAS和四(三甲基甲硅烷氧基)钛的甲苯溶液(TTST:(CH_3)_3SiO)_4Ti)在30分钟内覆盖膜。 TTST被用作促进FAS分子水解和/或聚合的催化剂。涂有FAS的CeO_2薄膜的静态接触角大于150°,即具有超疏水性。用于制造超疏水表面的最短处理时间为40分钟。接触角磁滞随着在硝酸铈水溶液中的浸渍时间的增加而减小。研究了镁合金AZ31表面超疏水表面的化学稳定性。发现超疏水表面在pH 4、7和10的溶液中浸泡24小时后的平均静态水接触角分别为139.7±2、140.0±2和145.7±2°。此外,还检查了溶液中超疏水表面在1至14的pH值下的化学稳定性。在pH为1到14的溶液中,超疏水表面的静态接触角大于142°,这表明我们的超疏水表面具有很高的化学稳定性。此外,使用电化学测量研究了镁合金上超疏水表面的耐腐蚀性。

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