A robust superhydrophobic surface on AA3003 aluminum alloy with intermetallic phases in-situ pinning effect for corrosion protection
A robust superhydrophobic surface on AA3003 aluminum alloy with intermetallic phases in-situ pinning effect for corrosion protection
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DOI：
10.1016/j.jallcom.2021.163038
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发表时间：
2021-11
影响因子：
6.2
通讯作者：
Hejie Yang;Yimin Gao;Weichao Qin;Jiapeng Sun;Zhifu Huang;Yefei Li;Bing Li;Jialin Sun
中科院分区：
文献类型：
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作者：
Hejie Yang;Yimin Gao;Weichao Qin;Jiapeng Sun;Zhifu Huang;Yefei Li;Bing Li;Jialin Sun
AA3003的局部腐蚀趋势是其广泛应用的最具挑战性的问题之一。AA3003中金属间相（IMPs）具有强化和点蚀的双重作用。解决这一矛盾有助于提高材料的耐蚀性，充分发挥材料的潜力。本文采用化学蚀刻结合硬脂酸（STA）改性的方法制备了具有IMPs原位钉钉效应的超疏水表面。因此，imp可以为超疏水表面提供良好的支撑，同时消除促进局部腐蚀的不利影响。蚀刻结构的形成机理是由于蚀刻液中imp与基体相的同步化学反应。用STA进一步修饰后，微/纳米层次结构表面由亲水性变为超疏水性。制备的表面最大静态接触角为~169°，最大滑动角为~1°，具有优异的超疏水性。此外，还对超疏水表面的润湿性、自洁性、化学稳定性、机械耐久性和耐腐蚀性等性能进行了全面研究。结果表明，在3.5 wt% NaCl溶液中，其缓蚀率可达99%以上。高分子聚合物在超疏水表面的钉钉方向影响其性能。预计超疏水表面的构建将拓宽其应用前景。
The tendency of AA3003 towards localized corrosion is one of the most challenging issues for its broader use. Intermetallic phases (IMPs) in AA3003 play dual contradictory roles: strengthening effect and initiating pitting. Solving this contradiction contributes to improvement of corrosion resistance and fully utilizing the potential of materials. Herein, a superhydrophobic surface with IMPs in-situ pinning effect was fabricated via a chemical etching approach combined with stearic acid (STA) modification. Thus, IMPs can provide sound support for the superhydrophobic surface and meanwhile eliminate the adverse effect of promoting localized corrosion. Formation mechanism of etching structure was attributed to the synchronous chemical reaction of IMPs and matrix phases in the etchant. Further modification with STA changed mico/nano hierarchical surface from hydrophilicity to superhydrophobicity. The as-prepared surface exhibited a maximum static contact angle of ~169° and a sliding angle of ~1°, possessing excellent superhydrophobicity. Besides, the wettability, self-cleaning, chemical stability, mechanical durability, and corrosion resistance properties of the superhydrophobic surface were comprehensively investigated. The results showed that the corrosion inhibition efficiency exceeded 99% in 3.5 wt% NaCl solution. The pinning direction of IMPs in superhydrophobic surface influenced its properties. It is anticipated that the construction of superhydrophobic surfaces will broaden its promising applications.