title: Corrosion Properties of Polydopamine Coatings Formed in One-Step Immersion Process on Magnesium.
abstract: Polydopamine layers were polymerized directly from Tris(hydroxymethyl)aminomethane-buffered solution in a one-step immersion process onto magnesium surface. Scanning electron microscopy showed successful formation of a ∼1 μm thick layer. ASTM D3359-09 "Tape test" revealed excellent adhesion of the layer. X-ray induced photoelectron spectroscopy and Fourier transform infrared spectroscopy verified the presence of polydopamine on the surface. Corrosion measurements were performed in 0.1 M NaCl solution investigating the influence of coating parameters: dopamine concentration, immersion time, solution pH, and immersion angle. Tafel analysis revealed strong improvement of corrosion behavior compared to bare magnesium. Polydopamine layers prepared with optimized coating procedure showed promising corrosion properties in Dulbecco's modified Eagle medium. In summary, polydopamine coatings offer a simple treatment for magnesium to improve the corrosion behavior and could further act as intermediate layer for further surface functionalization.
authors.affiliation: Chair for Surface Science and Corrosion, Department for Materials Science, University of Erlangen-Nuremberg , Martensstr. 7, 91058 Erlangen, Germany.
authors.forename: Ferdinand
authors.initials: F
authors.lastname: Singer
authors.affiliation: Chair for Surface Science and Corrosion, Department for Materials Science, University of Erlangen-Nuremberg , Martensstr. 7, 91058 Erlangen, Germany.
authors.forename: Magdalena
authors.initials: M
authors.lastname: Schlesak
authors.affiliation: Chair for Surface Science and Corrosion, Department for Materials Science, University of Erlangen-Nuremberg , Martensstr. 7, 91058 Erlangen, Germany.
authors.forename: Caroline
authors.initials: C
authors.lastname: Mebert
authors.affiliation: Chair for Surface Science and Corrosion, Department for Materials Science, University of Erlangen-Nuremberg , Martensstr. 7, 91058 Erlangen, Germany.
authors.forename: Sarah
authors.initials: S
authors.lastname: Höhn
authors.affiliation: Chair for Surface Science and Corrosion, Department for Materials Science, University of Erlangen-Nuremberg , Martensstr. 7, 91058 Erlangen, Germany.
authors.forename: Sannakaisa
authors.initials: S
authors.lastname: Virtanen
keywords: FTIR; coating; corrosion; magnesium; polydopamine