Formation mechanism of an aluminium-based chemical conversion coating on AZ91D magnesium alloy

2010 ◽  
Vol 17 (5) ◽  
pp. 641-647 ◽  
Author(s):  
Wei-ping Li ◽  
Xi-mei Wang ◽  
Li-qun Zhu ◽  
Wen Li
Keyword(s):  
Magnesium Alloy ◽  
Formation Mechanism ◽  
Chemical Conversion ◽  
Conversion Coating ◽  
Az91d Magnesium Alloy ◽  
Chemical Conversion Coating

Effect of Chrome-Free Chemical Conversion Coating on Corrosion Behavior of Magnesium Alloy AZ91D

2006 ◽  
Vol 15-17 ◽  
pp. 473-478
Author(s):  
Li Qun Bai ◽  
Di Li ◽  
Bao Lan Guo ◽  
Min Guo
Keyword(s):  
Corrosion Resistance ◽  
Magnesium Alloy ◽  
Salt Spray ◽  
Chemical Conversion ◽  
Electrochemical Measurement ◽  
Conversion Coating ◽  
Hydrogen Gas ◽  
Az91d Magnesium Alloy ◽  
One Step ◽  
Chemical Conversion Coating

The different chrome-free chemical conversion coatings were prepared on AZ91D magnesium alloy and SEM was used to observe the surface. The corrosion behaviors of die-casting AZ91D magnesium alloy with different coating in chloride environment were investigated by hydrogen gas evolution in immersion test, salt spray test and electrochemical measurement. The results showed that the corrosion resistance of magnesium alloy treated with two-step chemical conversion and sealing was the highest and was comparable with that of chromating, and followed by two-step chemical conversion treatment without sealing. The one-step chemical conversion treatment had the lowest corrosion resistance. Polarization and EIS characteristics in 5% NaCl solution depended on the type of surface treatment and correlated well with the order of corrosion resistance. Contrasted with one-step chemical conversion coating, the coating of two-step chemical conversion with sealing on magnesium alloy had more excellent corrosion resistance because the |Z| increased, the corrosion area was decreased and the time of the first pitting occurrence was prolonged. It is expected that this experiment can provide a foundation for designing more super chemical conversion coating to replacing the chromate conversion.

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

An investigation of new barium phosphate chemical conversion coating on AZ31 magnesium alloy

2012 ◽  
Vol 210 ◽  
pp. 156-165 ◽  
Author(s):  
Yougui Chen ◽  
Ben Li Luan ◽  
Guang-Ling Song ◽  
Qi Yang ◽  
David M. Kingston ◽  
...  
Keyword(s):  
Magnesium Alloy ◽  
Chemical Conversion ◽  
Conversion Coating ◽  
Az31 Magnesium Alloy ◽  
Chemical Conversion Coating
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