Ultrasonic atomization based fabrication of superhydrophobic and corrosion-resistant hydrolyzed MTMS/PVDF coatings

Q3 Materials Science

JCIS open Pub Date : 2022-10-01 DOI:10.1016/j.jciso.2022.100059

Mohammad Shakourian , Saeed Rahemi Ardekani , Amir Bayat , Esmaiel Saievar-Iranizad , Wim Deferme

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引用次数: 2

Abstract

A stable self-cleaning superhydrophobic coating with reliable corrosion resistance was coated on the aluminum alloy 6061. A dense polyvinylidene fluoride (PVDF) layer was first coated by the doctor blade method, and hydrolyzed methyltrimethoxysilane (HMTMS) nanospheres were then deposited on top of the PVDF using ultrasonic spray hydrolysis technique. Superhydrophobic coatings with a contact angle (CA) of 167° and a sliding angle of 7 ± 1° were obtained. The superhydrophobic coating exhibited self-cleaning behavior. The corrosion resistance of the layers was investigated in a 3.5 wt% NaCl aqueous solution using potentiodynamic polarization measurement and electrochemical impedance spectroscopy techniques, indicating the high corrosion resistance of the flat PVDF barrier and the excellent resistance of the superhydrophobic coating. The charge transfer resistance of the bare aluminum substrate measured as 6.572 kΩ cm² increased to 848.463 kΩ cm² and 3.411 × 10³ kΩ cm² with PVDF and HMTMS, respectively. The results showed that a proper superhydrophobic coating with good chemical stability could significantly increase the corrosion resistance of the substrate. We also showed the capability of the novel ultrasonic spray hydrolysis technique in fabricating stable superhydrophobic films for large-scale applications.

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超声雾化法制备超疏水耐腐蚀水解MTMS/PVDF涂层

在6061铝合金表面涂覆了一种稳定的、具有可靠耐腐蚀性能的自清洁超疏水涂层。首先采用博士刀法包覆一层致密的聚偏氟乙烯(PVDF)层，然后采用超声喷雾水解技术在PVDF层上沉积水解的甲基三甲氧基硅烷(HMTMS)纳米球。获得了接触角(CA)为167°、滑动角为7±1°的超疏水涂层。超疏水涂层表现出自清洁行为。在3.5 wt% NaCl水溶液中，利用动电位极化测量和电化学阻抗谱技术研究了各层的耐蚀性，表明扁平PVDF屏障具有较高的耐蚀性，超疏水涂层具有优异的耐蚀性。在PVDF和HMTMS的作用下，裸铝基板的电荷转移电阻分别从6.572 kΩ cm2和3.411 × 103 kΩ cm2增加到848.463 kΩ cm2和3.411 × 103 kΩ cm2。结果表明，适当的超疏水涂层具有良好的化学稳定性，可以显著提高基体的耐蚀性。我们还展示了新型超声喷雾水解技术在大规模应用中制备稳定的超疏水膜的能力。

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来源期刊

JCIS open Physical and Theoretical Chemistry, Colloid and Surface Chemistry, Surfaces, Coatings and Films

CiteScore

4.10

自引率

0.00%

发文量

审稿时长

36 days