Double-LayerCoating Films Prepared from Water-BorneLatexes of Acrylate–Vinylidene Chloride Copolymers: InvestigatingTheir Heavy-DutyAnticorrosive Properties.
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| Title: | Double-LayerCoating Films Prepared from Water-BorneLatexes of Acrylate–Vinylidene Chloride Copolymers: InvestigatingTheir Heavy-DutyAnticorrosive Properties. |
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| Authors: | Fu, Ce1, Zhang, Tong-Xian1, Cheng, Fa1, Cui, Wen-Zhu1, Chen, Yu1 |
| Source: | Industrial & Engineering Chemistry Research. Mar2014, Vol. 53 Issue 12, p4534-4543. 10p. |
| Subjects: | Thin films, Coating processes, Acrylates, Aqueous solutions, Zeta potential, Dichloroethylene, Copolymers, Corrosion inhibitors |
| Abstract: | Aqueous latexes ofcopolymers of vinylidene chloride (VDC) withan acrylate, namely, methyl acrylate (MA), ethyl acrylate (EA), butylacrylate (BA), or 2-ethylhexyl acrylate (EHA), were employed to forma double-layer coating film for the heavy-duty anticorrosion of metal.Measurements of the water-vapor transmission rate and oxygen-gas transmissionrate and electrochemical impedance spectroscopy (EIS) demonstratedthat the barrier properties of MA–VDC and EA–VDC filmswere better than those of BA–VDC and EHA–VDC films.Among the MA–VDC and EA–VDC coatings, EA–VDC85showed better comprehensive properties and, thus, was selected asthe top layer of the designed double-layer coating film. Adhesiontests demonstrated that the BA–VDC and EA–VDC coatingshad better adhesion to tinplates than the MA–VDC and EA–VDCcoatings and, thus, were suitable for use as the bottom layer of thedesigned double-layer coating film. The characterizations of the double-layercoating films by adhesion tests and EIS showed that BA–VDC75was the optimal bottom layer. Under harsh salt-spray corrosion conditions,the optimal double-layer coating film (ca. 50-μm thickness)with EA–VDC85 as the top layer and BA–VDC75 as the bottomlayer could protect tinplate well for at least 800 h, and the adhesionof the coating film to the tinplate was still excellent even after1000 h of corrosion. Scanning electron microscopy, differential scanningcalorimetry, and Fourier-transform infrared spectroscopy were usedto evaluate the corroded double-layer coating films. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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