| A Novel Mg-Al-Co LDH/ MAO Composite Films on LA103Z
Magnesium-Lithium Alloy and Its Active Anti-corrosion
Performance |
Jumei Zhang,a, * Kai Wang,a Xin Duan,a Anrong Hou,a Jiacheng Li,a Hui Caia and Zhihu Wangb
Pages : 251-257
DOI : 10.1080/0371750X.2021.2004239 |
| Abstract |
| In order to further improve the corrosion resistance of the micro-arc oxidization (MAO)
film on LA103Z magnesium-lithium alloy, a Mg-Al-Co layered double hydroxide (LDH)
film was fabricated on MAO film by an in-situ hydrothermal method. The results showed
that with the extension of hydrothermal treatment time, the dense LDH film sealed the
micro-pores and cracks in the MAO film successfully. In addition, LDH film treated
with a hydrothermal treatment at 90oC for 24 h has the best electrical insulation. The
hydrogen evolution rates (mL.cm–2.h–1) of the LDH/MAO composite films rank as
LDH/MAO-24 h ï‚» LDH/MAO-30 h (0.12) < LDH/MAO-18 h (0.15) < LDH/MAO-12 h (0.16)
< MAO (0.25). Meanwhile, the results of potentiodynamic polarization curves showed
that the corrosion potential of LDH/MAO-24 h film increased from –1.5349 to –1.388 V,
and the corrosion current density decreased by three orders of magnitude. Therefore,
the LDH/MAO film has better corrosion resistance than a single MAO film and adds
long-term corrosion resistance to the magnesium alloy, which owes to the sealing
effect of LDH on inherent defects and trapping effect on corrosion ions.
[Keywords: Mg-Li alloy, Mg-Al-Co LDH/MAO composite films, Morphology, Corrosion
resistance] |
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