PT Journal
AU Silva Campos, MdR
   Blawert, C
   Mendis, CL
   Mohedano, M
   Zimmermann, T
   Proefrock, D
   Zheludkevich, ML
   Kainer, KU
TI Effect of Heat Treatment on the Corrosion Behavior of Mg-10Gd Alloy in 0.5% NaCl Solution
SO Frontiers in Materials
PY 2020
PU Frontiers Media SA
DI 10.3389/fmats.2020.00084
WP https://macau.uni-kiel.de/receive/macau_mods_00000857
LA en
DE Mg corrosion; rare earth – Gd; Mg5Gd phase; Gd enrichment; EIS
SN 2296-8016
AB In 0.5 wt.% NaCl aqueous solution, Mg-10Gd alloy shows promising corrosion
resistance. The microstructure of this alloy was modified via heat treatments to
understand the effect of accompanying microstructural changes on the corrosion
resistance. It was found that corrosion performance depends both on the amount and
the distribution of the cathodic intermetallic phases. The T4 heat treatment (24 h at
540
◦
C) caused the Gd to distribute uniformly in the matrix, which had positive effect
on corrosion resistance showing a delay in the time required for the first observation
of localized corrosion. The T4 heat treated specimens, specimens aged at 200
◦
C and
300
◦
C, showed relatively uniform degradation and thus these heat treatments are not
detrimental in terms of corrosion resistance. In contrast, heat treatment at 400
◦
C seems
to increase the formation of small cuboidal particles rich in Gd, most likely to be GdH2
particles, in the matrix, resulting in a detrimental effect on the corrosion behavior.
PI Lausanne
ER