.png){kind=icon}
.png){kind=icon}
Return
Facile fabrication of PDMS-CP-SiO2 double-layer superhydrophobic coating: superior mechanical stability and long-term corrosion protection for metals
.png){kind=icon}
PRE
AI
B
Y
Z
Y
H
H
DOI：10.1007/s10853-026-13480-7.png)
.png){kind=icon}
Original request for help.png){kind=icon}
Share.png){kind=icon}
Save
Abstract
En 中文
In the current field of coating engineering, superhydrophobic coatings used for corrosion protection of metal surfaces exhibit poor mechanical wear resistance and long-term corrosion resistance and are liable to fail under harsh environmental conditions or prolonged service. To solve this problem, our investigation proposes a novel composite method called “modified micro-/nanoparticles combined with double-layer structure” to produce a high-efficiency PDMS-CP-SiO2 superhydrophobic coating by spraying. A crucial step involved the preparation of CP-SiO2 particles, where hydrophilic kaolin (CP) was used as a cheap matrix and then reacted with hexadecyltrimethoxysilane (HDTMS) and tetraethyl orthosilicate (TEOS) to anchor SiO2 nanoparticles onto the CP surface, forming a multi-level micro-nano rough structure with intrinsically low surface energy. Another distinctive feature is the double-layer structure: The pure PDMS lower layer ensures strong adhesion and a tight anti-corrosive barrier, while the CP-SiO2 upper layer has superhydrophobicity. Specifically, the upper layer was deposited onto the partially cured lower layer to achieve a smooth interface, which significantly improves the interlayer bond. Experimental results indicate that the PDMS-CP-SiO2 coating shows excellent superhydrophobicity (CA = 162.2 ± 2.6°, SA = 4.0 ± 0.4°) and self-cleaning ability, repelling substances like coffee, ink, milk, and dust. From the mechanical aspect, it still preserves superhydrophobicity (CA > 150°, SA < 15°) even after being rubbed with a 20-m sandpaper (100 g load) and peeled 1000 times by a tape, showing good durability and adhesion. The addition of CP not only produces a rough surface but also the lamellar structure of CP distributed in the coating can prolong the corrosion pathway and enhance the anti-corrosion effect. Electrochemically, it achieves a corrosion protection rate exceeding 99.9% with an impedance modulus (|Z| at 0.01 Hz) of 1.08 × 1011 Ω cm2, which is six times higher than that of PDMS and CP-SiO2 coatings. Moreover, the coating does not change its properties after a 30 d salt spray test (5.0 wt% NaCl) and maintains its hydrophobicity for 7 d in strong acid/alkali solutions and 20 d under UV irradiation. Our work successfully combines inexpensive raw materials, a simple manufacturing process and various performance features, providing a practical and reliable solution to prevent metal corrosion in harsh industrial and marine environments.
Journal
IF:
3.9
Papers:
3.2W
Citations:
7.2W
Organization
Cited Papers