A Novel Organic Conversion Coating based on N-Benzoyl-N-Phenylhydroxylamine Chemistry for the Corrosion Protection of AA2024-T3

2017 ◽  
Vol 246 ◽  
pp. 197-207 ◽  
Author(s):  
Xiaolei Guo ◽  
Belinda Hurley ◽  
Fan Yang ◽  
Rudolph Buchheit
Keyword(s):  
Corrosion Protection ◽  
Conversion Coating

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.

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.

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

Use of a sol–gel conversion coating for aluminum corrosion protection

2001 ◽  
Vol 140 (1) ◽  
pp. 44-50 ◽  
Author(s):  
X.F. Yang ◽  
D.E. Tallman ◽  
V.J. Gelling ◽  
G.P. Bierwagen ◽  
L.S. Kasten ◽  
...  
Keyword(s):  
Corrosion Protection ◽  
Sol Gel ◽  
Conversion Coating ◽  
Aluminum Corrosion

Characterization of Ce conversion coating on Gr-f/6061Al composite surface for corrosion protection

2008 ◽  
Vol 461 (1-2) ◽  
pp. 389-394 ◽  
Author(s):  
Gaohui Wu ◽  
Chunyu Wang ◽  
Qiang Zhang ◽  
Pengchao Kang
Keyword(s):  
Corrosion Protection ◽  
Conversion Coating ◽  
Composite Surface
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