Abstract
CeO2 nanoparticles were incorporated in waterborne binders containing high biobased content (up to 70%) in order to analyze the anticorrosion performance for direct to metal coatings. Biobased binders were synthesized by batch miniemulsion polymerization of 2-octyl acrylate and isobornyl methacrylate monomers using a phosphate polymerizable surfactant (Sipomer PAM200) that lead to the formation of phosphate functionalized latexes. Upon the direct application of such binders on steel, the functionalized polymer particles were able to interact with steel, creating a thin phosphatization layer between the metal and the polymer and avoiding flash rust. The in situ incorporation of the CeO2 nanoparticles during the polymerization process led to their homogeneous distribution in the final polymer film, which produced outstanding anticorrosion performance according to the Electrochemical Impedance Spectroscopy measurements. In fact, steel substrates coated with the hybrid polymer film (30–40 µm thick) showed high barrier corrosion resistance after 41 days (~1000 h) of immersion in NaCl water solution and active inhibition capabilities thanks to the presence of the CeO2 nanoparticles. This work opens the door to the fabrication of sustainable hybrid anticorrosion waterborne coatings.
Highlights
Nowadays, mild steel is one of the most important materials in construction, industry and transportation because of its versatility and good mechanical properties
High biobased content latexes were produced using 2-octyl acrylate (2-OA) and isobornyl methacrylate (IBOMA) as monomers. 2-OA is a soft monomer whereas IBOMA is a hard one; their homopolymers have a Tg of −44 ◦ C and 150 ◦ C, respectively
Badia et al [20] synthesized partially biodegradable waterborne coatings with a biocontent ranging from 30 to 65% using Ecomer®, an allyl polyglucoside maleic acid ester functional monomer, in combination with 2-OA, IBOMA and butyl acrylate
Summary
Mild steel is one of the most important materials in construction, industry and transportation because of its versatility and good mechanical properties. The development of a successful protective organic coating is still an important scientific challenge [2]. An efficient anticorrosion coating must offer good barrier properties, in order to avoid the contact of the steel with water and oxygen (i.e., hindering their permeability). Such barrier capabilities are mainly provided by the polymer matrix in organic coatings, where solvent-based polymers are the most popular among the commercial ones. Due to the more and more demanding environmental regulations on the emission of volatile organic compounds (VOC), the coating market is moving towards the use of waterborne coatings
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