Journal
SURFACE & COATINGS TECHNOLOGY
Volume 358, Issue -, Pages 594-603Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.surfcoat.2018.11.070
Keywords
Magnesium alloy; Corrosion resistance; Layered double hydroxides; Potentiodynamic polarization; Anion-exchange
Funding
- NSFC [11544010, 11374359, 11304405, 1155305]
- Natural Science Foundation of Chongqing [cstc2018jcyjAX0450, cstc2015jcyjA50035, cstc2015jcyjA1660]
- Science and Technology Research Program of Chongqing Municipal Education Commission [KJKJQN201800102]
- Opening Project of Material Corrosion and Protection Key Laboratory of Sichuan Province [2017CL14]
- Fundamental Research Funds for the Central Universities [2018CDJDWL0011, 106112017CDJQJ328839, 106112016CDJZR288805, 106112015CDJXY300002]
- Visiting Scholar Foundation of Key Laboratory of Biorheological Science and Technology (Chongqing University), Ministry of Education of China [CQKLBST-2015-003]
- Sharing Fund of Large-scale Equipment of Chongqing University [201612150094, 201712150005, 201712150006, 201712150010]
- [SKLMT-ZZKT-2017M15]
- [SKLMZZKT-2015 Z16]
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Layered double hydroxides (LDHs) have great potential as protective coatings on magnesium alloys due to their nanolamellar structure and exchangeability of interlayer anions. ZnAl layered double hydroxides films intercalated with nitrate anions (ZnAl-NO3--LDHs) was synthesized on the AZ31 magnesium alloy by hydrothermal method. In order to obtain better corrosion resistance, ZnAl-X-LDHs (X = Cl-, VO43-, PO43-, or MoO42-) were prepared by using ZnAl-NO3--LDHs as a precursor, and Cl, VO43-, PO43-, and MoO42- anions intercalated into the LDHs interlayers to replace NO3- through anion-exchange reaction. X-ray diffraction (XRD), scanning electronic microscopy (SEM) and Fourier transform infrared (FT-IR) spectroscopy were used to investigate structure, morphology and composition of the ZnAI-LDHs. The corrosion resistance of ZnAl-LDHs intercalated with different anions was compared by potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) measurements. The results show that the corrosion resistance of ZnAl-LDHs films is ranged in order as follows: ZnAl-VO43--LDHs > ZnAl-MoO42--LDHs > ZnAl-PO(4)(3-)LDHs > ZnAl-Cl-LDHs > ZnAl-NO3- LDHs. ZnAl-VO43--LDHs has the largest basal spacing distances don) value and strongest ability to release anions and absorb chloride ions, so ZnAl-VO43--LDHs films has the optimal corrosion resistance and can provide enhanced anticorrosion protection for magnesium alloys substrate.
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