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.
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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DOI：
10.1021/la100474x
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发表时间：
2010-04
期刊：
影响因子：
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通讯作者：
T. Ishizaki;N. Saito
中科院分区：
文献类型：
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作者：
T. Ishizaki;N. Saito
我们已经开发了一种简单，简单，节省时间的方法，通过简单的浸泡过程在室温下在镁合金上产生超疏水表面。首先，在硝酸铈水溶液中浸泡20 min，在镁合金表面垂直形成结晶型的CeO(2)薄膜。晶体相对于镁合金的垂直密度随浸渍时间的增加而增加。接下来，在含有FAS和四（三甲基硅氧基）钛(TTST: (CH(3))（3)SiO)(4)Ti）的甲苯溶液中浸泡30分钟，用氟烷基硅烷(FAS: CF(3)(CF(2))(7)CH(2)CH(2)Si(OCH（3))(3)）分子覆盖薄膜。用TTST作为催化剂促进FAS分子的水解和/或聚合。fas涂层的CeO(2)膜具有超过150度的静态接触角，即具有超疏水性。制备超疏水表面的最短加工时间为40 min。接触角迟滞量随浸在硝酸铈水溶液中时间的增加而减小。研究了AZ31镁合金超疏水表面的化学稳定性。在pH为4、7和10的溶液中浸泡24 h后，超疏水表面的平均静水接触角分别为139.7 +/- 2度、140.0 +/- 2度和145.7 +/- 2度。此外，还考察了超疏水表面在pH为1 ~ 14的溶液中的化学稳定性。在pH为1 ~ 14的溶液中，超疏水表面的静态接触角大于142度，表明我们的超疏水表面具有很高的化学稳定性。此外，采用电化学测量方法研究了镁合金超疏水表面的耐蚀性。
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))(7)CH(2)CH(2)Si(OCH(3))(3)) molecules within 30 min by immersion in a toluene solution containing FAS and tetrakis(trimethylsiloxy)titanium (TTST: (CH(3))(3)SiO)(4)Ti). 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 degrees, 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 degrees, 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 degrees 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.