Constructing superhydrophobic WO3@TiO2 nanoflake surface beyond amorphous alloy against electrochemical corrosion on iron steel
Constructing superhydrophobic WO3@TiO2 nanoflake surface beyond amorphous alloy against electrochemical corrosion on iron steel
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DOI：
10.1016/j.apsusc.2017.11.211
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发表时间：
2018-04
影响因子：
6.7
通讯作者：
Shanshan Yu;Yun-han Ling;Rongguang Wang;Jizhong Zhang;F. Qin;Zhang Zhiyu
中科院分区：
文献类型：
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作者：
Shanshan Yu;Yun-han Ling;Rongguang Wang;Jizhong Zhang;F. Qin;Zhang Zhiyu
为了消除有害的局部腐蚀，提出了一种在不锈钢上形成的 FeW 非晶合金之外构建超疏水 WO3@TiO2 分层纳米片表面的新方法。在低温下采用简便的脱合金和液相沉积来形成纳米结构层，该纳米结构层由涂覆有 TiO2 纳米颗粒 (NPs) 层的内部 WO3 纳米薄片组成。 PFDS进一步沉积在纳米片上后，接触角达到162°，光照下腐蚀电位负移230mV，在3.5wt% NaCl溶液中具有高耐腐蚀性。研究了超疏水表面和光电响应之间的权衡。研究发现，这种表面特征使316不锈钢不受局部腐蚀的影响，无论有无光照，都可以检测到明显的光致电子存储/释放过程以及功能层的稳定性，其背后的机制可能与疏水性导致的表面电位增加以及主要源自WO3价态变化的半导体涂层的延迟阴极保护有关。这项研究展示了一种简单且低成本的钢铁保护电化学方法，以及在工程规模上产生超疏水表面和具有可控电子存储/释放的阴极保护的新方法。
To eliminate harmful localized corrosion, a new approach by constructing superhydrophobic WO3@TiO2hierarchical nanoflake surface beyond FeW amorphous alloy formed on stainless steel was proposed. Facile dealloying and liquid deposition was employed at low temperature to form a nanostructured layer composing inner WO3nanoflakes coated with TiO2nanoparticles (NPs) layer. After further deposition of PFDS on nanoflakes, the contact angle reached 162° while the corrosion potential showed a negative shift of 230 mV under illumination, resulting in high corrosion resistance in 3.5 wt% NaCl solution. The tradeoff between superhydrophobic surface and photo-electro response was investigated. It was found that this surface feature makes 316 SS be immune to localized corrosion and a pronounced photo-induced process of electron storage/release as well as the stability of the functional layer were detected with or without illumination, and the mechanism behind this may be related to the increase of surface potential due to water repellence and the delayed cathodic protection of semiconducting coating derived mainly from the valence state changes of WO3. This study demonstrates a simple and low-cost electrochemical approach for protection of steel and novel means to produce superhydrophobic surface and cathodic protection with controllable electron storage/release on engineering scale.