A comparative study of nanoscale poly N-(vinyl) pyrrole in polyvinyl butyral coatings for the anti-corrosion property of zinc: Nanotubes vs nanoparticles

• Published in: Progress in organic coatings Vol. 136; p. 105251
• Main Authors: Hao, Lu, Zhu, Kaiming, Lv, Guowei, Yu, Demei
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 01.11.2019; Elsevier BV
• Subjects: Absorption spectra; Carbon black; Cetyltrimethylammonium bromide; Comparative studies; Composite; Corrosion; Corrosion effects; Corrosion mechanisms; Corrosion prevention; Electrochemical impedance spectroscopy; Morphology; Nanoparticles; Nanostructure; Nanotubes; NMR spectroscopy; Open circuit voltage; Optical microscopy; Organic chemistry; Poly N-(vinyl) pyrrole; Polyvinyl acetal resins; Polyvinyl butyral; Protective coatings; Scanning electron microscopy; Spectrum analysis; Zinc; Zinc coatings; Composite; Corrosion; Poly N-(vinyl) pyrrole; Morphology
• ISSN: 0300-9440; 1873-331X
• DOI: 10.1016/j.porgcoat.2019.105251

•PNVPY NTs and NPs were prepared via a UV-catalyzed green method with CTAB and PVP as soft templates, respectively.•The PNVPY NTs and NPs were severally incorporated with CB into PVB matrix to improve the anti-corrossion properties of coatings.•The PNVPY NPs/CB/PVB composite coating had less defects and promoted the charge trasfer between zinc and electrolyte.•The composite coatings blended with PNVPY NPs yielded better protection of zinc in 3.5% NaCl solution than those blended with PNVPY NTs. Poly N-(vinyl) pyrrole (PNVPY) nanotubes (NTs) and nanoparticles (NPs) were prepared via a UV-catalyzed green chemical oxidative method in the presence of cetyltrimethylammonium bromide (CTAB) and polyvinyl pyrrolidone (PVP) as soft templates, respectively. The chemical structure of the PNVPY nanostructures was characterized by FTIR spectroscopy, UV–vis absorption spectra and 1H-NMR spectroscopy. The morphologies of PNVPY nanostructures were observed by the scanning electron microscopy (SEM) and transmission electron microscopy (TEM). It was indicated that PNVPY NTs had an outer diameter less than 200 nm and a length in microscale. PNVPY NPs had an average diameter of 30 nm. Moreover, a series of anti-corrosion coatings on zinc were prepared by blending nanostructured PNVPY and carbon black with polyvinyl butyral (PVB) matrix to investigate the effect of the morphologies of PNVPY nanostructures on the corrosion protection ability. The surface and cross-sectional morphologies of the anti-corrosion coatings were observed by optical microscopy and SEM. Open circuit potential (OCP), electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization measurements showed that PNVPY NPs with a larger surface area and a smaller scale yield a better anti-corrosion performance than PNVPY NTs in the coatings. The probable anti-corrosion mechanism of these anti-corrosion coatings was proposed.