Created with Sketch.

2. Sep 2019 | Application Areas

Corrosion behaviour of Ppy coating modified by PEG doped ammonium bifluoride

In a new study, polypyrrole (Ppy) coatings embedded by polyethylene glycol (PEG) doped ammonium bifluoride (doped Ppy) was deposited on the AZ31 Mg alloy using cyclic voltammetry.

Rusty anchor.

The investigations showed that doped Ppy coatings possessed higher corrosion resistance than that of Ppy coating. Source: Paco Verdera – Fotolia.com.

Fluoride-nuclear magnetic resonance (F-NMR), thermal gravimetric analysis (TGA), and differential scanning calorimetry (DSC) results showed that the doping of fluoride in the polyethylene glycol molecule was implemented. Corrosion performance of the doped Ppy coatings was assessed by electrochemical impedance spectroscopy (EIS) and potentiodynamic polarisation techniques in 0.05 M NaCl solution.

Doped Ppy coatings with higher corrosion resistance

Field emission scanning electron microscopy (FESEM) and energy-dispersive x-ray spectroscopy (EDS) showed that doped Ppy coatings possessed higher corrosion resistance than that of Ppy coating. Charge transfer resistance of doped Ppy coating measured about 2 and 5 times higher than un-doped Ppy and Ppy coatings, respectively which were associated to the synergistic behaviour of fluoride with polyethylene glycol as well as its release to the anodic zones.

The study is published in: Progress in Organic Coatings Volume 134, September 2019, Pages 22-32.

European Coatings Journal

Subscriptions

European Coatings Journal

European Coatings Journal is Europe’s leading monthly journal for the coatings industry:

  • Trendsetting industry news
  • Cutting-edge technical papers
  • Exclusive market insight

Manufacturers and suppliers, associations and institutes use European Coatings Journal as their preferred source of information for the professional, more practical aspects of technology.

Tags

This could also be interesting for you!

0 Comments

You are currently not logged in

To leave a comment, please log in.

Login
For continuously improving and optimizing our websites, we use cookies. By using our website, you agree to the usage of cookies. For more information, please visit our Privacy policy.
Accept