Journal of Electrochemical Science and Technology

The Korean Electrochemical Society (한국전기화학회)
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Corrosion Protection Performance of PVDF/PMMA-Blended Coatings by Electrochemical Impedance Method

  • Kim, Yun Hwan (COEX technical team, PPG Industrials (Korea)) ;
  • Kwon, Yong Sung (Department of Industrial Chemistry, Pukyong National University) ;
  • Shon, Min Young (Department of Industrial Chemistry, Pukyong National University) ;
  • Moon, Myung Jun (Department of Industrial Chemistry, Pukyong National University)
  • Received : 2017.10.26
  • Accepted : 2017.12.19
  • Published : 2018.03.31
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Abstract

The effect of mixing ratio on the corrosion protection of carbon steel coated by a film composed of poly(vinylidene) fluoride (PVDF) and poly(methyl methacrylate) (PMMA) was examined using electrochemical impedance spectroscopy. Surface crystallization behavior and thermal properties of the PVDF/PMMA coated carbon steel were evaluated using polarized optical microscopy and differential scanning calorimetry, respectively. A Maltese cross-pattern spherulite crystal was observed in the PVDF/PMMA coating film, which became more apparent with increasing PVDF content. The highest corrosion protection performance was achieved with 60 wt.% PVDF-coated carbon steel, and delamination and corrosion reactions were observed for 20 wt.% PVDF-coated carbon steel. Further, corrosion protection performance with an amorphous/crystal mixture (PVDF/PMMA, 60/40 (w/w)) was better than those observed in the amorphous domain and the perfect-crystal domain of the PVDF/PMMA blended coating system.

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