Improvement of electrochemical corrosion characteristics of AZ61 magnesium alloy with unconventional fluoride conversion coatings

0500227 - ÚFM 2020 RIV CH eng J - Journal Article
Fintová, Stanislava - Drábiková, J. - Pastorek, F. - Tkacz, J. - Kuběna, Ivo - Trško, L. - Hadzima, B. - Minda, J. - Doležal, P. - Wasserbauer, J. - Ptáček, P.
Improvement of electrochemical corrosion characteristics of AZ61 magnesium alloy with unconventional fluoride conversion coatings.
Surface and Coatings Technology. Roč. 357, JAN (2019), s. 638-650. ISSN 0257-8972
R&D Projects: GA MŠMT(CZ) EF16_013/0001823
Institutional support: RVO:68081723
Keywords : Wrought AZ61 magnesium alloy * Potentiodynamic tests * Electrochemical impedance spectroscopy * Corrosion * Fluoride conversion coating
OECD category: Coating and films
Impact factor: 3.784, year: 2019
Method of publishing: Limited access
https://www.sciencedirect.com/science/article/pii/S0257897218311411?via%3Dihub

Fluoride conversion coating was applied on wrought AZ61 magnesium alloy by the immersion of alloy in Na[BF4] molten salt. Two different temperatures 430 °C and 450 °C, and different treatment times of 0.5, 2 and 8 h were used for the coating preparation. The surface morphology and the cross-sections of the coatings were investigated by scanning electron microscopy, focused ion beam cutting and energy-dispersive X-ray spectroscopy. The electrochemical corrosion characteristics of coated material varied with processing conditions. A significant improvement of electrochemical corrosion properties of the AZ61 magnesium alloy coated with fluoride conversion coatings was revealed by the potentiodynamic tests and electrochemical impedance spectroscopy.
Permanent Link: http://hdl.handle.net/11104/0300196