The corrosion susceptibility significantly limits the application range of magnesium alloys. Recently it was demonstrated that noble impurities present in the Mg-based materials can play a detrimental role for corrosion resistance. One of the important mechanisms is related to the enhanced cathodic activity at the corrosion front and the superfluous hydrogen caused by iron re-deposition process . The effect drastically accelerates corrosion of impurity containing Mg. In the present work a new inhibition approach based on the complexation of Fe ions and consequently preventing re-deposition is suggested . The newly discovered corrosion inhibitors are integrated within protective coatings in order to obtain active corrosion protection effect for Mg alloys.
D. Höche, C. Blawert, S.V. Lamaka, N. Scharnagl, C. Mendis, M.L. Zheludkevich, Phys. Chem. Chem. Phys., 18 (2016) 1279-1291.
S.V. Lamaka, D. Höche, R.P. Petrauskas, C. Blawert, M.L. Zheludkevich, Electrochemistry Communications, 62 (2016) 5-8.