Corrosion inhibition of decylphosphonate on bare and PEO-coated Mg alloy
Bahram Vaghefinazari, Sviatlana V. Lamaka, Eugen Gazenbiller, K.A. Yasakau, Carsten Blawert, Maria Serdechnova, Nico Scharnagl, D. C. Florian Wieland, Mikhail L. Zheludkevich
Abstract
PEO coatings, aside from their reasonable corrosion protection, also feature a porous microstructure that can serve as a repository for corrosion inhibitors. This study presents and investigates the high corrosion inhibition effect of sodium salt of decylphosphonate (DP) when incorporated into PEO coating on a magnesium substrate. The interaction of DP with both bare and PEO-coated magnesium substrates was studied to understand its corrosion inhibition mechanism. Additionally, a strategy to enhance the active anti-corrosion ability of the DP-containing system was suggested and examined. The findings provide new insights into the potential of surfactants as corrosion inhibitors for magnesium alloys.