scholarly journals Corrosion Protection of Magnesium Alloys: From Chromium VI Process to Alternative Coatings Technologies

10.5772/66604 ◽  
2017 ◽  
Author(s):  
Jérome Frayret ◽  
Jean Charles Dupin ◽  
Sébastien Pommiers
Keyword(s):  
Magnesium Alloys ◽  
Corrosion Protection ◽  
Chromium Vi

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.

Controlled release and corrosion protection by self-assembled colloidal particles electrodeposited onto magnesium alloys

2015 ◽  
Vol 3 (8) ◽  
pp. 1667-1676 ◽  
Author(s):  
Jiadi Sun ◽  
Ye Zhu ◽  
Long Meng ◽  
Wei Wei ◽  
Yang Li ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Magnesium Alloy ◽  
Controlled Release ◽  
Magnesium Alloys ◽  
Corrosion Protection ◽  
Colloidal Particles ◽  
Self Assembled ◽  
Bioactive Agents

Self-assembled nanoparticles loaded with bioactive agents were electrodeposited to provide the magnesium alloy with controlled release and corrosion resistance properties.

Corrosion Protection and Microstructure of Magnesium Alloys Anodized by Phosphate Solution

2010 ◽  
Vol 638-642 ◽  
pp. 1464-1469
Author(s):  
Koji Murakami ◽  
Makoto Hino ◽  
Atsushi Saijo ◽  
Teruto Kanadani
Keyword(s):  
Sodium Chloride ◽  
Magnesium Oxide ◽  
Magnesium Alloys ◽  
Corrosion Protection ◽  
Corrosion Current ◽  
Electrochemical Analysis ◽  
The State ◽  
Phosphate Solution ◽  
Protective Films ◽  
Sacrificial Protection

Corrosion protection by anodization and conversion treatment in phosphate solution was studied by microstructural and electrochemical analysis. Both the anodized and the conversion-treated layers showed sacrificial protection in a solution of sodium chloride. The corrosion current or the dissolving rate of the anodized layer was smaller than that of the conversion-treated surface. The modified layers had another mode of protection to form protective films on magnesium substrate where the original modified layers were mechanically lost. Since the state of magnesium in the anodized layer is close to magnesium oxide, phosphorus in the layer is considered to have an important role in these properties concerning the above corrosion protection.

Catechol/polyethyleneimine conversion coating with enhanced corrosion protection of magnesium alloys: potential applications for vascular implants

2018 ◽  
Vol 6 (43) ◽  
pp. 6936-6949 ◽  
Author(s):  
Hao Zhang ◽  
Lingxia Xie ◽  
Xiaolong Shen ◽  
Tengda Shang ◽  
Rifang Luo ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Surface Modification ◽  
Magnesium Alloys ◽  
Corrosion Protection ◽  
Conversion Coating ◽  
Good Corrosion Resistance ◽  
Potential Applications

A catechol/polyethyleneimine conversion coating on a MgZnMn alloy possessed good corrosion resistance. Heparin was further grafted on it and this showed the potential for surface modification of magnesium-based vascular implants.

Superhydrophobic coatings for corrosion protection of magnesium alloys

2020 ◽  
Vol 52 ◽  
pp. 100-118 ◽  
Author(s):  
Wenhui Yao ◽  
Wu Liang ◽  
Guangsheng Huang ◽  
Bin Jiang ◽  
Andrej Atrens ◽  
...  
Keyword(s):  
Magnesium Alloys ◽  
Corrosion Protection ◽  
Superhydrophobic Coatings

Corrosion protection of magnesium alloys by cerium, zirconium and niobium-based conversion coatings

2008 ◽  
Vol 50 (7) ◽  
pp. 1907-1918 ◽  
Author(s):  
Hélène Ardelean ◽  
Isabelle Frateur ◽  
Philippe Marcus
Keyword(s):  
Magnesium Alloys ◽  
Corrosion Protection ◽  
Conversion Coatings

Glass-like CexOy sol–gel coatings for corrosion protection of aluminium and magnesium alloys

2011 ◽  
Vol 206 (2-3) ◽  
pp. 257-264 ◽  
Author(s):  
N.C. Rosero-Navarro ◽  
M. Curioni ◽  
Y. Castro ◽  
M. Aparicio ◽  
G.E. Thompson ◽  
...  
Keyword(s):  
Magnesium Alloys ◽  
Corrosion Protection ◽  
Sol Gel

scholarly journals Influence of substrate composition on corrosion protection of sol–gel thin films on magnesium alloys in 0.6M NaCl aqueous solution

2014 ◽  
Vol 77 (11) ◽  
pp. 1642-1652 ◽  
Author(s):  
A.A. El-Hadad ◽  
V. Barranco ◽  
A. Samaniego ◽  
I. Llorente ◽  
F.R. García-Galván ◽  
...  
Keyword(s):  
Thin Films ◽  
Aqueous Solution ◽  
Magnesium Alloys ◽  
Corrosion Protection ◽  
Sol Gel ◽  
Substrate Composition ◽  
Influence Of Substrate
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