TY - JOUR
T1 - Large-scale prepared superhydrophobic HDTMS-modified diatomite/epoxy resin composite coatings for high-performance corrosion protection of magnesium alloys
AU - Wang, Tengle
AU - Guo, Qi
AU - Zhang, Tian C.
AU - Zhang, Yu Xin
AU - Yuan, Shaojun
N1 - Funding Information:
The authors are thankful for the financial support of the National Natural Science Foundation of China (21978182). The authors also acknowledged Dr. Yingming Zhu from the Institute of New Energy and Low Carbon Technology of Sichuan University for the SEM and EDS characterization, Dr. Xiang Lin, Mr. Yuanlong Wang and Dr. Pan Wu from the Engineering Teaching Center, School of Chemical Engineering, Sichuan University for the FTIR, TGA and electrochemical measurements, and Miss Panpan Li from Shiyanjia Lab (http://www.shiyanjia.com) for the XPS measurement.
Funding Information:
The authors are thankful for the financial support of the National Natural Science Foundation of China ( 21978182 ). The authors also acknowledged Dr. Yingming Zhu from the Institute of New Energy and Low Carbon Technology of Sichuan University for the SEM and EDS characterization, Dr. Xiang Lin, Mr. Yuanlong Wang and Dr. Pan Wu from the Engineering Teaching Center, School of Chemical Engineering, Sichuan University for the FTIR, TGA and electrochemical measurements, and Miss Panpan Li from Shiyanjia Lab ( http://www.shiyanjia.com ) for the XPS measurement.
Publisher Copyright:
© 2022 Elsevier B.V.
PY - 2022/9
Y1 - 2022/9
N2 - Superhydrophobic coatings have great potential applications in protecting metallic substrates due to their excellent water-repellency and high corrosion resistance, however, most of their preparation processes are complicated, expensive and difficult to scale up for practical applications. Herein, we reported a facile, low-cost and large-scale-preparation method to fabricate superhydrophobic coatings on the magnesium alloy, of which superhydrophobic hexadecyltrimethoxysilane (HDTMS)-modified diatomite powder was first synthesized by electrochemical deposition method, and subsequent spray coating of the epoxy resin and superhydrophobic diatomite mixture was performed to form superhydrophobic composite coatings on the alloy substrates. The influencing factors of surface wettability of the modified diatomite were comprehensively investigated. Under the optimized synthesis condition of a current density of 0.033 A·cm−2 and electrodeposition time of 2.5 h, the superhydrophobic diatomite powder had an approximately 260 % (in mass fraction) production yield. The spray-coated composite coating delivered superior superhydrophobicity with water contact angle of circa 157° and self-cleaning ability. Such superhydrophobic coating also exhibited a high corrosion protection efficiency of circa 99.8 % and excellent anti-icing performance, and was demonstrated to own ISO grade 1 adhesion and good chemical stability to bear 90 days of immersion in a 3.5 wt% NaCl solution and 20 days of salt spray testing without corrosion. In addition, the superhydrophobic composite coating exhibited great robustness against water impact and sand impact. Therefore, this diatomite/epoxy resin-based superhydrophobic coating can be effectively used for Mg alloy anti-corrosion and has the potential in large-scale production for practical applications.
AB - Superhydrophobic coatings have great potential applications in protecting metallic substrates due to their excellent water-repellency and high corrosion resistance, however, most of their preparation processes are complicated, expensive and difficult to scale up for practical applications. Herein, we reported a facile, low-cost and large-scale-preparation method to fabricate superhydrophobic coatings on the magnesium alloy, of which superhydrophobic hexadecyltrimethoxysilane (HDTMS)-modified diatomite powder was first synthesized by electrochemical deposition method, and subsequent spray coating of the epoxy resin and superhydrophobic diatomite mixture was performed to form superhydrophobic composite coatings on the alloy substrates. The influencing factors of surface wettability of the modified diatomite were comprehensively investigated. Under the optimized synthesis condition of a current density of 0.033 A·cm−2 and electrodeposition time of 2.5 h, the superhydrophobic diatomite powder had an approximately 260 % (in mass fraction) production yield. The spray-coated composite coating delivered superior superhydrophobicity with water contact angle of circa 157° and self-cleaning ability. Such superhydrophobic coating also exhibited a high corrosion protection efficiency of circa 99.8 % and excellent anti-icing performance, and was demonstrated to own ISO grade 1 adhesion and good chemical stability to bear 90 days of immersion in a 3.5 wt% NaCl solution and 20 days of salt spray testing without corrosion. In addition, the superhydrophobic composite coating exhibited great robustness against water impact and sand impact. Therefore, this diatomite/epoxy resin-based superhydrophobic coating can be effectively used for Mg alloy anti-corrosion and has the potential in large-scale production for practical applications.
KW - Anticorrosion
KW - Diatomite
KW - Electrochemical deposition
KW - Magnesium alloys
KW - Superhydrophobic coating
UR - http://www.scopus.com/inward/record.url?scp=85133557884&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85133557884&partnerID=8YFLogxK
U2 - 10.1016/j.porgcoat.2022.106999
DO - 10.1016/j.porgcoat.2022.106999
M3 - Article
AN - SCOPUS:85133557884
SN - 0033-0655
VL - 170
JO - Progress in Organic Coatings
JF - Progress in Organic Coatings
M1 - 106999
ER -