Double-Layer Coating Films Prepared from Water-Borne Latexes of Acrylate–Vinylidene Chloride Copolymers: Investigating Their Heavy-Duty Anticorrosive Properties

Abstract

Aqueous latexes of copolymers of vinylidene chloride (VDC) with an acrylate, namely, methyl acrylate (MA), ethyl acrylate (EA), butyl acrylate (BA), or 2-ethylhexyl acrylate (EHA), were employed to form a double-layer coating film for the heavy-duty anticorrosion of metal. Measurements of the water-vapor transmission rate and oxygen-gas transmission rate and electrochemical impedance spectroscopy (EIS) demonstrated that the barrier properties of MA–VDC and EA–VDC films were better than those of BA–VDC and EHA–VDC films. Among the MA–VDC and EA–VDC coatings, EA–VDC85 showed better comprehensive properties and, thus, was selected as the top layer of the designed double-layer coating film. Adhesion tests demonstrated that the BA–VDC and EA–VDC coatings had better adhesion to tinplates than the MA–VDC and EA–VDC coatings and, thus, were suitable for use as the bottom layer of the designed double-layer coating film. The characterizations of the double-layer coating films by adhesion tests and EIS showed that BA–VDC75 was 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 bottom layer could protect tinplate well for at least 800 h, and the adhesion of the coating film to the tinplate was still excellent even after 1000 h of corrosion. Scanning electron microscopy, differential scanning calorimetry, and Fourier-transform infrared spectroscopy were used to evaluate the corroded double-layer coating films.

Surface Functionalization of an Aluminum Alloy to Generate an Antibiofilm Coating Based on Poly(Methyl Methacrylate) and Silver Nanoparticles

“…Although PMMA coatings have high levels of mechanical strength, thermal stability, and corrosion resistance, cathodic delamination is evident over time due to the hydrolysis of the siloxane bond in the inorganic polymer matrix [ 7 , 8 ]. There is currently major interest in research into directly bonding coatings to surfaces [ 7 , 8 , 9 , 10 ].…”

Dual-Emissive Coating Films Prepared from Water-Borne Latexes of Acrylate–Vinylidene Chloride Copolymers: Their Room-Temperature Phosphorescence Properties and Sensing Abilities toward Solvents

“…Copolymer latexes of vinylidene chloride (VDC) with (meth)­acrylate, acrylonitrile, or vinyl chloride have been targeted for the applications as coatings for paper, fibers, or packaging. − Moreover, the water-borne latexes of acrylate–VDC copolymers have been explored for the application as heavy-duty coating materials for metal protection. − The N -substituted 4-bromo-1,8-naphthalimides have been verified to be efficient RTP phosphors, which also had characteristics of good stability and facile preparation. ,− Thus, in this contribution, N -hydroxyethyl 4-bromo-1,8-naphthalimide (HBN) was chosen as RTP phosphor to dope the water-borne latexes of acrylate–VDC copolymers. The coating films formed from the HBN-doped acrylate–VDC copolymers were dual-emissive, including a normal fluorescence emission and RTP emission under ambient condition.…”

Study on a Novel Recyclable Anticorrosion Gel Coating Based on Ethyl Cellulose and Thermoplastic Polyurethane

“…At present, most of the heavy-duty anticorrosive coatings are solvent-based crosslinking curing resins, such as epoxy resin [5,6], polyurethane [9], and acrylic resin [8,10]. In the process of connection structures installation and later maintenance, the disassembly and assembly operation are easy to cause damage to these coatings and reduce the protection performance of the coating.…”