期刊
PROGRESS IN ORGANIC COATINGS
卷 171, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.porgcoat.2022.107059
关键词
Benzoxazine; Crosslinking control; Sol-gel; Hydrophobicity; Corrosion protection; Aluminum alloys
资金
- Shanghai Pujiang Program [2020PJD015]
- National Natural Science Foundation of China [21978086]
- Shanghai Municipal Science and Technology Commission [21520761100]
- Open Project of State Key Laboratory of Chemical Engineering [SKL-ChE-21C07]
- Fundamental Research Funds for the Central Universities, Science and Technology Commission of Shanghai Municipality [20DZ2254500]
The study found that a complete curing crosslinking structure with high crosslinking degree contributes to better corrosion protection performance in the coating. Additionally, the hydrophobicity of the coating is also an important factor affecting corrosion protection performance.
Benzoxazine (Bz)-based hybrid sol-gel coating (TEOS-PBz) was prepared by compositing benzoxazine functional silane and Tetraethoxysilane (TEOS) and its distinct crosslinking structures were controlled by a designed curing procedure. The coatings' structures were analyzed by Fourier transform infrared spectroscopy, X-ray photoelectron spectrums and differential scanning calorimetry. It is evident that a prolonged curing procedure could promote curing of Bz functionality completely with high crosslinking degree in the coating, which is a key factor to the coatings' corrosion resistance. The hydrophobicity of the coating is also taken into account as this is also one of the factors affecting the corrosion protection performance. According to the result of electrochemical impedance spectroscopy, the TEOS-PBz with the maximum static water contact angle of 105.6 +/- 0.4. showed the highest impedance with the value of Rct above 105 O after being immersed in 3.5 wt% NaCl aqueous solution for one week, more than one order of magnitude higher than traditional TetraethoxysilaneGlycidoxypropyltriethoxysilane (TEOS-GPTES) hybrid sol-gel coating. It is possible to conclude that complete curing crosslinking structure with the conversion of Bz structure >94 % and high hydrophobicity contributed by less intermolecular hydrogen bonding ratio in the coating presented better corrosion protection performance.
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