Abstract
High-performance anti-corrosion coatings featuring easy processability and thin thickness are highly desired in industry. Yet, solution process coating often faces a sedimentation problem with particles which are used as reinforcement in coatings. In this contribution, boron nitride (BN) was modified by an acrylate silane coupling agent (KH-570) to obtain acrylated BN flakes. Afterwards, the acrylated BN flakes were in situ copolymerized with 2-(perfluorohexyl)ethyl methacrylate to synthesize BN-fluorinated poly methacrylate (PFBP) composites. The as-obtained PFBP composites can form stable coating solutions, in which sedimentation of BN flakes seldom happens. The coating solution can easily form uniform coatings on various substrates with nanoscale thickness, confirmed by scanning electron microscope (SEM). The corrosion resistance of the samples coated PFBP coatings in 3.5 wt.% sodium chloride solution was evaluated by electrochemical impedance spectroscopy (EIS). It is indicated that the incorporation of BN flakes greatly reduce the corrosion rate. Adhesion measurements and abrasion resistance test indicate the PFBP coating performs good adhesion to substrate and robustness. Through the in situ polymerization, acrylated BN flakes are connected with the polymer chain, which inhibits the sedimentation of BN in the coating solution. Additionally, the BN flakes dispersed in the fluorinated polymer act as barriers, improving the corrosion resistance of the coated samples.
Highlights
The well-dispersed boron nitride (BN) flakes are beneficial to copolymerize with the fluorinated acrylate monomer and formed stable coating solution
UV–vis spectrophotometry based on the Lambert–Beer law indicates that the absorbance is linearly related to the concentration of a solution [30]
The acrylated BN flakes were in situ copolymerized with 2-(perfluorohex well dissolved in a fluorous solvent
Summary
Anti-moisture and anti-corrosion for the metallic components are highly desirable in industry. Coating with polymeric film is one of the most effective and convenient methods to prevent the corrosion of metal. Through forming a water-repellent coating film as a barrier, polymer coatings protect the metal surface from corrosion [1]. The protective polymeric coatings widely used in the electronic industry include fluorinecontaining resin, epoxy resin, phenolic resin, etc. Fluorine-containing resin features low surface energy, low water absorption, high hydrophobicity and high stability [3,4]. Compared to the widely used fluorinated resins, e.g., polytetrafluoroethylene (PTFE), which can be hardly dissolved in solvent, fluorinated polyacrylate is soluble in some fluorous solvents, resulting in an ease of processibility in forming films on substrate [5,6,7]
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