Molybdate/phosphate composite conversion coating on magnesium alloy surface for corrosion protection

2008 ◽  
Vol 255 (5) ◽  
pp. 1672-1680 ◽  
Author(s):  
Zhiyi Yong ◽  
Jin Zhu ◽  
Cheng Qiu ◽  
Yali Liu
Keyword(s):  
Magnesium Alloy ◽  
Corrosion Protection ◽  
Conversion Coating ◽  
Alloy Surface

Investigation of the Surface Modification on Biomedical Magnesium Alloy

2015 ◽  
Vol 1095 ◽  
pp. 295-298 ◽  
Author(s):  
You Dong Xu ◽  
Jian Qing Xiong ◽  
Shi Guang Xu ◽  
Jun Jun Zhang
Keyword(s):  
Magnesium Alloy ◽  
Body Fluid ◽  
Energy Dispersive Spectrometry ◽  
Electrochemical Impedance ◽  
Corrosion Behaviour ◽  
Conversion Coating ◽  
Alloy Surface ◽  
Material Surface ◽  
Original Material ◽  
Cell Toxicity

In this work, the green chemistry conversion coating on AZ31 magnesium alloy surface was made and studied by means of Ce (SO4)2·2(NH4)2SO4·4H2O and MnSO4 as inhibitor, H2O2 as oxidant, NaCl as accelerator, CH3COOH as stabilizer. The coating was evaluated in simulated body fluid (SBF) with pH=7.4 at 37°C by using electrochemical impedance spectroscopy (EIS). The results show the conversion coating resistance, for the untreated or treated alloy, is 0.75 kΩ·cm2 and 3.28 kΩ·cm2 respectively. It indicates the conversion coating treated surface presents better corrosion behaviour in SBF than the original material surface. The morphologies and composition the coating were examined by scanning electron microscopy (SEM) and energy dispersive spectrometry (EDS) respectively. The result indicates that the Ce-Mn conversion coating was made on magnesium alloy surface. Biocompatibility of conversion coating was investigated by use of cell toxicity. Cell culture has shown that the magnesium alloy has good cytocompatibility.

Nano ZnO-assisted formation of zinc phosphate conversion coating for improving corrosion protection of AZ91D magnesium alloy

2019 ◽  
Vol 6 (8) ◽  
pp. 086405
Author(s):  
Gui Lou ◽  
Peng Jia ◽  
Xinying Teng ◽  
Jinyang Zhang ◽  
Zhijian Ye ◽  
...  
Keyword(s):  
Magnesium Alloy ◽  
Corrosion Protection ◽  
Zinc Phosphate ◽  
Conversion Coating ◽  
Nano Zno ◽  
Az91d Magnesium Alloy

Utilisation of High-Energy Heat Sources in Magnesium Alloy Surface Layer Treatment

2013 ◽  
Vol 58 (2) ◽  
pp. 619-624 ◽  
Author(s):  
M. Szafarska ◽  
J. Iwaszko ◽  
K. Kudła ◽  
I. Łegowik
Keyword(s):  
Surface Layer ◽  
Magnesium Alloy ◽  
Physicochemical Properties ◽  
Treatment Effectiveness ◽  
High Energy ◽  
Alloy Surface ◽  
Heat Sources ◽  
X Ray ◽  
Additional Equipment ◽  
Alloy Surface Layer

The main aim of the study was the evaluation of magnesium alloy surface treatment effectiveness using high-energy heat sources, i.e. a Yb-YAG Disk Laser and the GTAW method. The AZ91 and AM60 commercial magnesium alloys were subject to surface layer modification. Because of the physicochemical properties of the materials studied in case of the GTAW method, it was necessary to provide the welding stand with additional equipment. A novel two-torch set with torches operating in tandem was developed within the experiment. The effectiveness of specimen remelting using a laser and the GTAW method was verified based on macro- and microscopic examinations as well as in X-ray phase analysis and hardness measurements. In addition, the remelting parameters were optimised. The proposed treatment methodology enabled the achieving of the intended result and effective modification of a magnesium alloy surface layer.

scholarly journals Design and Multidimensional Screening of Flash-PEO Coatings for Mg in Comparison to Commercial Chromium(VI) Conversion Coating

Metals ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 337
Author(s):  
Ewa Wierzbicka ◽  
Marta Mohedano ◽  
Endzhe Matykina ◽  
Raul Arrabal
Keyword(s):  
Corrosion Resistance ◽  
Corrosion Protection ◽  
Electrochemical Impedance ◽  
Salt Spray ◽  
Conversion Coating ◽  
Neutral Salt ◽  
Chromium Vi ◽  
Alkaline Electrolytes ◽  
Az31b Alloy ◽  
Plasma Electrolytic

REACH (Registration, Evaluation, Authorisation and Restriction of Chemicals) regulations demand for an expedient discovery of a Cr(VI)-free alternative corrosion protection for light alloys even though the green alternatives might never be as cheap as current harmful technologies. In the present work, flash- plasma electrolytic oxidation coatings (FPEO) with the process duration < 90 s are developed on AZ31B alloy in varied mixtures of silicate-, phosphate-, aluminate-, and fluoride-based alkaline electrolytes implementing current density and voltage limits. The overall evaluation of the coatings’ anticorrosion performance (electrochemical impedance spectroscopy (EIS), neutral salt spray test (NSST), paintability) shows that from nine optimized FPEO recipes, two (based on phosphate, fluoride, and aluminate or silicate mixtures) are found to be an adequate substitute for commercially used Cr(VI)-based conversion coating (CCC). The FPEO coatings with the best corrosion resistance consume a very low amount of energy (~1 kW h m−2 µm−1). It is also found that the lower the energy consumption of the FPEO process, the better the corrosion resistance of the resultant coating. The superb corrosion protection and a solid environmentally friendly outlook of PEO-based corrosion protection technology may facilitate the economic justification for industrial end-users of the current-consuming process as a replacement of the electroless CCC process.

MgAl-V2O7 4- LDHs/(PEI/MXene)10 composite film for magnesium alloy corrosion protection

2021 ◽  
Author(s):  
Yulong Wu ◽  
Liang Wu ◽  
Mikhail L. Zheludkevich ◽  
Yanning Chen ◽  
Maria Serdechnova ◽  
...  
Keyword(s):  
Magnesium Alloy ◽  
Composite Film ◽  
Corrosion Protection

Formation of a phosphoric acid compound film on an AZ31 magnesium alloy surface using cavitation bubbles

2021 ◽  
pp. 101194
Author(s):  
Masataka Ijiri ◽  
Koji Yamaguchi ◽  
Shoichi Kikuchi ◽  
Fumihiro Kato ◽  
Yui Kunieda ◽  
...  
Keyword(s):  
Magnesium Alloy ◽  
Phosphoric Acid ◽  
Az31 Magnesium Alloy ◽  
Alloy Surface ◽  
Cavitation Bubbles ◽  
Acid Compound

Cerium-based chemical conversion coating on AZ63 magnesium alloy

2003 ◽  
Vol 172 (2-3) ◽  
pp. 227-232 ◽  
Author(s):  
Manuele Dabalà ◽  
Katya Brunelli ◽  
Enrico Napolitani ◽  
Maurizio Magrini
Keyword(s):  
Magnesium Alloy ◽  
Chemical Conversion ◽  
Conversion Coating ◽  
Chemical Conversion Coating

In vivo corrosion and corrosion protection of magnesium alloy LAE442☆

2010 ◽  
Vol 6 (5) ◽  
pp. 1792-1799 ◽  
Author(s):  
F. Witte ◽  
J. Fischer ◽  
J. Nellesen ◽  
C. Vogt ◽  
J. Vogt ◽  
...  
Keyword(s):  
Magnesium Alloy ◽  
Corrosion Protection
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