Detail publikačního výsledku

Structure and growth kinetic of unconventional fluoride conversion coating prepared on wrought AZ61 magnesium alloy

DRÁBIKOVÁ, J.; FINTOVÁ, S.; PTÁČEK, P.; KUBĚNA, I.; BŘEZINA, M.; WASSERBAUER, J.; DOLEŽAL, P.; PASTOREK, F.

Originální název

Structure and growth kinetic of unconventional fluoride conversion coating prepared on wrought AZ61 magnesium alloy

Anglický název

Structure and growth kinetic of unconventional fluoride conversion coating prepared on wrought AZ61 magnesium alloy

Druh

Článek WoS

Originální abstrakt

The structure, kinetics and thermodynamics of formation of unconventional fluoride conversion coating on wrought AZ61 magnesium alloy are described in this work. Fluoride conversion coating was prepared by immersion of the specimens of AZ61 magnesium alloy into Na[BF4] molten salt at 410, 420, 430, 440 and 450 degrees C for 0.5, 1, 2, 4, 8, 12, 24 and 36 h. Testing methods, such as scanning electron microscopy, focused ion beam cutting and transmission electron microscopy were used for the morphology analysis, chemical composition and microstructure investigation of the fluoride conversion coating. It was found that the coating was composed of the primary MgF2 and secondary Na[MgF3] layer. The growth mechanism of the primary coating layer was described by the empirical kinetic method. The apparent activation energy and pre-exponential factor, estimated from the Arrhenius plot, are 82.87 kJ.mol(-1) and 8.22 s(-1), respectively. The kinetic analysis of the coating growth indicates that the process is driven by the parabolic rate law of the stationary one-dimensional diffusion at 410 degrees C. The Jander equation of the stationary three-dimensional diffusion describes the coating growth at higher investigated temperatures.

Anglický abstrakt

The structure, kinetics and thermodynamics of formation of unconventional fluoride conversion coating on wrought AZ61 magnesium alloy are described in this work. Fluoride conversion coating was prepared by immersion of the specimens of AZ61 magnesium alloy into Na[BF4] molten salt at 410, 420, 430, 440 and 450 degrees C for 0.5, 1, 2, 4, 8, 12, 24 and 36 h. Testing methods, such as scanning electron microscopy, focused ion beam cutting and transmission electron microscopy were used for the morphology analysis, chemical composition and microstructure investigation of the fluoride conversion coating. It was found that the coating was composed of the primary MgF2 and secondary Na[MgF3] layer. The growth mechanism of the primary coating layer was described by the empirical kinetic method. The apparent activation energy and pre-exponential factor, estimated from the Arrhenius plot, are 82.87 kJ.mol(-1) and 8.22 s(-1), respectively. The kinetic analysis of the coating growth indicates that the process is driven by the parabolic rate law of the stationary one-dimensional diffusion at 410 degrees C. The Jander equation of the stationary three-dimensional diffusion describes the coating growth at higher investigated temperatures.

Klíčová slova

Magnesium alloys; Coating; Kinetic; Diffusion

Klíčová slova v angličtině

Magnesium alloys; Coating; Kinetic; Diffusion

Autoři

DRÁBIKOVÁ, J.; FINTOVÁ, S.; PTÁČEK, P.; KUBĚNA, I.; BŘEZINA, M.; WASSERBAUER, J.; DOLEŽAL, P.; PASTOREK, F.

Rok RIV

2021

Vydáno

15.10.2020

Nakladatel

ELSEVIER SCIENCE SA

Místo

LAUSANNE

ISSN

0257-8972

Periodikum

SURFACE & COATINGS TECHNOLOGY

Svazek

399

Číslo

1

Stát

Švýcarská konfederace

Strany od

1

Strany do

10

Strany počet

10

URL

https://www.sciencedirect.com/science/article/abs/pii/S0257897220307702?via%3Dihub

BibTex

@article{BUT167330,
  author="Juliána {Drábiková} and Stanislava {Fintová} and Petr {Ptáček} and Ivo {Kuběna} and Matěj {Březina} and Jaromír {Wasserbauer} and Pavel {Doležal} and Filip {Pastorek}",
  title="Structure and growth kinetic of unconventional fluoride conversion coating prepared on wrought AZ61 magnesium alloy",
  journal="SURFACE & COATINGS TECHNOLOGY",
  year="2020",
  volume="399",
  number="1",
  pages="1--10",
  doi="10.1016/j.surfcoat.2020.126101",
  issn="0257-8972",
  url="https://www.sciencedirect.com/science/article/abs/pii/S0257897220307702?via%3Dihub"
}