Subjects: Materials Science >> Materials Science (General) submitted time 2023-03-31 Cooperative journals: 《中国腐蚀与防护学报》
Abstract： Corrosion is a very common and serious problem which has a harmful impact on the economy development of the country. Among others the application of organic paints is the most economical and efficient way to protect engineering structures from corrosion. Fluorocarbon paint is one of the most widely used resins for anticorrosion application due to its excellent corrosion resistance, chemical resistance，and weatherability. However, fluorocarbon paint also has some disadvantages restricting its application in some fields, so it is necessary to modify the fluorocarbon paint. In this article，the development history and application of the fluorocarbon paint were systematically summarized. Then various modification methods including chemical modification, physical blending, and filler modification used for enhancing the anti- corrosion performance of fluorocarbon paint were introduced. Finally, the development trend of fluorocarbon paint was forecasted.
Subjects: Materials Science >> Materials Science (General) submitted time 2023-03-31 Cooperative journals: 《中国腐蚀与防护学报》
Abstract： Organic-inorganic hybrid sol-gel coatings with high solid content were prepared on copper surface by means of hydrolysis-condensation reaction. 3-Mercaptopropyltrimethoxysilane (MPTMS), tetraethylorthosilicate (TEOS) and hydrochloric acid were used as organic precursor, inorganic precursor and catalysts respectively. The chemical composition, and the average size of solparticles and the surface- and cross section-morphology of sol-gel coatings were characterized by Fourier transform infrared spectroscopy, dynamic light scattering particle size analyzer and field emission scanning electron microscopy respectively. The adhesion and corrosion performance of sol-gel coatings were investigated by pull-off adhesion tester and electrochemical workstation. The results showed that the thermo-stability of the coatings was significantly improved due to the addition of TEOS. However, the average size of sol particles increased with the increase of TEOS content. Excessive addition of TEOS can induce holes and cracks on the surface of coatings or within the coatings. The coatings owned the best corrosion resistance when the molar ratio of TEOS to MPTMS was 0.6 due to their larger crosslinking density and fewer defects.
Subjects: Materials Science >> Materials Science (General) submitted time 2023-03-31 Cooperative journals: 《腐蚀科学与防护技术》
Abstract： none
Subjects: Materials Science >> Materials Science (General) submitted time 2023-03-18 Cooperative journals: 《材料研究学报》
Abstract： A superhydrophobic ZnAl coating was prepared by the electric arc spraying technology and then surface modification by stearic acid/ethanol. The surface wettability, morphology and chemical structure of the ZnAl coating before and after modification were characterized by contact angle measurement (OCA-20), scanning electron microscope (SEM) and artificial FTIR spectrometer (ATR), respectively. The impedance spectrum and polarization curves of the coatings were measuared by electrochemical workstation (Solartron Analytical) with three electrodes system. The results show that the as sprayed ZnAl coating consists of irregular micro- and nano-sized alloy particles and pores, and exhibits clear hydrophilicity, which may be ascribed to the high surface energy of metallic coating. After the surface modification with stearic acid, the static contact angle of the coating reached 153.8� with a rolling angle less than 10� , because there exsited a large number of hydrophobic long alkyl chains on the surface of the modified ZnAl coating. In addition, the surface modification could significantly enhance the corrosion resistance of ZnAl coating due to that the thin hydrophobic film plays an important role in supression of the fall off and dissolution of corrosion products on the ZnAl coating, leading to the increase of charge transfer resistance and the corrosion current density.
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