RT Journal Article
T1 Permanganate-Fluorozirconate conversion coating as precursor for Flash-PEO on AZ31B magnesium alloy
A1 Vega Vega, Jesus Manuel
A1 Matykina, Endzhe
A1 Arrabal Durán, Raúl
A1 Guerra Mutis, Marlon Hernando
AB The corrosion resistance of AZ31B magnesium alloy was evaluated after a two-step surface treatment consisting of a permanganate–fluorozirconate conversion layer followed by Flash-PEO in a silicate–fluoride (SiF) electrolyte.Electrochemical tests after 24 h immersion in 0.5 wt% NaCl demonstrated that the structured coating reduced the corrosion rate when compared to the reference Flash-PEO SiF coating ((3.4 ± 1.0) × 10−6 mm yr−1 versus (1.3 ± 0.8) × 10−5 mm yr−1). After 72 h, this trend persisted, with impedance values at low frequency one order of magnitude higher than its counterpart without precursor layer ((1.4 ± 1.0) × 107 Ω cm2 versus (2.6 ± 1.0) × 106 Ω cm2). Notably, Flash-PEO coatings in both cases preserved electrochemical integrity even in the presence of pre-existing surface defects.The permanganate–fluorozirconate precursor layer promoted, after Flash-PEO processing, a distinctive “coral reef-like” morphology with reduced interconnected porosity, thereby enhancing barrier properties by limiting substrate exposure to the corrosive environment. Complementary characterization confirmed the incorporation of zirconium and manganese species, along with compounds typically derived from the Flash-PEO SiF electrolyte.
PB ELSEVIER
YR 2025
FD 2025-10-09
LK https://hdl.handle.net/20.500.14352/126000
UL https://hdl.handle.net/20.500.14352/126000
LA eng
NO M.H. Guerra-Mutis, J.M. Vega, E. Matykina, R. Arrabal, Permanganate-fluorozirconate conversion coating as precursor for Flash-PEO on AZ31B magnesium alloy, Ceramics International, Volume 51, Issue 28, Part C, (2025), pp 58817-58834.
NO The authors gratefully acknowledge the support of the PID2021-124341OB-C22/AEI/10.13039/501100011033/FEDER, UE (MICIU). J.M. Vega also acknowledges the Grant RYC2021-034384-I funded by MICIU/AEI/10.13039/501100011033 and by “European Union NextGenerationEU/PRTR”.
NO Agencia Estatal de Investigación (España)
NO Ministerio de Ciencia, Innovación y Universidades (España)
NO Feder, UE
NO European Union NextGenerationEU/PRTR
DS Docta Complutense
RD 20 mar 2026