Value addition to waterborne polyurethane resin by silicone modification for developing high performance coating on aluminum alloy

Pathak, S.S.; Sharma, Atul; Khanna, A. S.

doi:10.1016/j.porgcoat.2008.11.005

Cited by 87 publications

(32 citation statements)

References 31 publications

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“…A non-chrome/chrome replacement coating system would need to extend the life of existing Al-based assets and facilitate expanded use of economical aluminum alloys in both DoD and commercial applications [31]. Consequently, extensive research has been conducted in search of alternative technologies, such as anodization [32], sol-gel treatment [33][34][35], pigmented coatings [36], plasma polymer layers [37], conductive pigments/polymers [38,39], and pigment-based cathodic protection [40].…”

Section: Magnesium-rich Primermentioning

confidence: 99%

Magnesium-Based Sacrificial Anode Cathodic Protection Coatings (Mg-Rich Primers) for Aluminum Alloys

Pathak

Mendon

Blanton

et al. 2012

Metals

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Abstract:Magnesium is electrochemically the most active metal employed in common structural alloys of iron and aluminum. Mg is widely used as a sacrificial anode to provide cathodic protection of underground and undersea metallic structures, ships, submarines, bridges, decks, aircraft and ground transportation systems. Following the same principle of utilizing Mg characteristics in engineering advantages in a decade-long successful R&D effort, Mg powder is now employed in organic coatings (termed as Mg-rich primers) as a sacrificial anode pigment to protect aerospace grade aluminum alloys against corrosion. Mg-rich primers have performed very well on aluminum alloys when compared against the current chromate standard, but the carcinogenic chromate-based coatings/pretreatments are being widely used by the Department of Defense (DoD) to protect its infrastructure and fleets against corrosion damage. Factors such as reactivity of Mg particles in the coating matrix during exposure to aggressive corrosion environments, interaction of atmospheric gases with Mg particles and the impact of Mg dissolution, increases in pH and hydrogen gas liberation at coating-metal interface, and primer adhesion need to be considered for further development of Mg-rich primer technology.

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Section: Magnesium-rich Primermentioning

confidence: 99%

Magnesium-Based Sacrificial Anode Cathodic Protection Coatings (Mg-Rich Primers) for Aluminum Alloys

Pathak

Mendon

Blanton

et al. 2012

Metals

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“…Collinson 等 [15] 、Woo 等 [16] Figure 1 The influences of pH values for the zeta potential of siliconzirconium hybrid sol 图 3 硅锆杂化溶胶阴极电泳沉积过程示意图 Figure 3 The schematic of cathodic electrophoretic deposition process of silicon-zirconium hybrid sol [20,21] . 952 cm -1 和 1633 cm -1 附近为硅醇与 TPOZ 水解所得锆醇缩聚形成的 Si-O-Zr 键的振动峰 [22] .…”

Section: 引言mentioning

confidence: 99%

Preparation and Properties of Silicon-Zirconium Hybrid Coatings by Electrophoretic Deposition on LC4 Aluminum Alloy

Liu¹,

Dong²,

Yu³

et al. 2012

Acta Chim. Sinica

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Silicon-zirconium hybrid coatings were prepared by cathode electrophoretic deposition (EPD) method on the surface of LC4 aluminum alloy. The influence of deposition conditions on the morphology, structure and corrosion resistance of the hybrid coatings was studied. Silicon sol and zirconium sol with a molar ratio Si/Zr＝3∶1 were prepared separately and then mixed. The silane solutions used here consist of GTMS (3-glycidoxypropyltrimethoxysilane) and absolute ethanol and deionized water mixed solvent, with pH adjusted by acetic acid. The obtained solutions were vigorously stirred at room temperature for 1 h. On the other hand, TPOZ (zirconium n-propoxide) was complexed with ethyl acetoacetate and diluted with absolute ethanol up to a molar ratio ethanol/H 2 O＝3∶1. The Zr-solution was stirred for 1 h at room temperature. After then Si-solution and Zr-solution were mixed under stirring at room temperature for 30 min. Two-electrode system in which Plumbum and LC4 aluminum alloy as the anode and the cathode respectively was applied for the deposition of silicon-zirconium organic-inorganic hybrid coatings. The electrodeposition was mainly carried out at different cathodic potentials (0, 2, 5, 10, 20 V, respectively), for 10 min. Finally the silane films were dried at room tempreture and then cured at 60 ℃ for 2 h, 90 ℃ for 30 min, 100 ℃ for 15 min at air atmosphere in an oven. Further heat treatment provides the thermal energy for the condensation reaction. The zeta potential of different solution was measured by nano-particle size analyzer. The morphology and roughness of the hybrid coatings were detected by using scanning electron microscopy (SEM) and atomic force microscope (AFM), respectively. The chemical structure of the silicon-zirconium hybrid coatings was investigated by using Fourier transform infrared spectroscopy (FTIR). The corrosion resistance of the hybrid coatings was studied by electrochemical impedance spectroscopy (EIS). Finally, the corrosion resistance mechanism of the coatings was discussed. The results showed that the optimum pH of the hybrid solution was 1.6 and the best cathode voltage was 5 V, under which the hybrid coatings are of best performance with uniform surface, dense structure, less roughness, and excellent corrosion resistance in 3.5% NaCl solution.

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“…Polymer-based coatings such as organic-inorganic hybrids are the proposed solutions for elimination of these shortcomings without losing the natural appearance. Hybrids originating from epoxy and urethane systems have been developed in recent years [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Investigation of Coating Performance of UV-Curable Hybrid Polymers Containing 1H,1H,2H,2H-Perfluorooctyltriethoxysilane Coated on Aluminum Substrates

Çakır

2017

Coatings

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This study describes preparation and characterization of fluorine-containing organicinorganic hybrid coatings. The organic part consists of bisphenol-A glycerolate (1 glycerol/phenol) diacrylate resin and 1,6-hexanediol diacrylate reactive diluent. The inorganically rich part comprises trimethoxysilane-terminated urethane, 1H,1H,2H,2H-perfluorooctyltriethoxysilane, 3-(trimethoxysilyl) propyl methacrylate and sol-gel precursors that are products of hydrolysis and condensation reactions. Bisphenol-A glycerolate (1 glycerol/phenol) diacrylate resin was added to the inorganic part in predetermined amounts. The resultant mixture was utilized in the preparation of free films as well as coatings on aluminum substrates. Thermal and mechanical tests such as DSC, thermo-gravimetric analysis (TGA), and tensile and shore D hardness tests were performed on free films. Water contact angle, gloss, Taber abrasion test, cross-cut and tubular impact tests were conducted on the coated samples. SEM examination and EDS analysis was performed on the fractured surfaces of free films. The hybrid coatings on the aluminum sheets gave rise to properties such as moderately glossed surface; low wear rate and hydrophobicity. Tensile strength of free films increased with up to 10% inorganic content in the hybrid structure and this increase was approximately three times that of the control sample. As expected; the % strain value decreased by 17.3 with the increase in inorganic content and elastic modulus values increased by a factor of approximately 6. Resistance to ketone-based solvents was proven and an increase in hardness was observed as the ratio of the inorganic part increased. Samples which contain 10% sol-gel content were observed to provide optimal properties.

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Value addition to waterborne polyurethane resin by silicone modification for developing high performance coating on aluminum alloy

Cited by 87 publications

References 31 publications

Magnesium-Based Sacrificial Anode Cathodic Protection Coatings (Mg-Rich Primers) for Aluminum Alloys

Magnesium-Based Sacrificial Anode Cathodic Protection Coatings (Mg-Rich Primers) for Aluminum Alloys

Preparation and Properties of Silicon-Zirconium Hybrid Coatings by Electrophoretic Deposition on LC4 Aluminum Alloy

Investigation of Coating Performance of UV-Curable Hybrid Polymers Containing 1H,1H,2H,2H-Perfluorooctyltriethoxysilane Coated on Aluminum Substrates

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