I recently finished a research about stimulus feedback anticorrosion coating. The corrosion inhibitor I choose was 8-hydroxyquinoline (8-HQ): Once corrosion on magnusium alloy started, 8-hydroxyquinoline could be released and mitigate the corrosion situation. The reviewer suggested me to replace 8-hydroxyquinoline with a more efficient corrosion inhibitor. They believe that 8-HQ is not the best inhibitor for Mg alloys.
My system is designed as storing and stimulus-responsively releasing organic corrosion inhibitor molecules. I choose 8-hydroxyquinoline as a classic magnesium corrosion inhibitor to illustrate the feasibility of my system. However, I think developing a more efficient inhibitor in short time is hard. So, can anyone give me a clue about more efficient magnesium alloy corrosion inhibitor (organic), like paeonol?
Many thanks to all those who have taken the time to read this question and provide valuable suggestions. :)
Hi,
Which Mg alloy are you targeting?
Mg corrosion inhibitors are not universal. The one good for AZ31 might have an adverse effect on WE43.
Thank you for kind reminding! I forgot to mention that the Magnesium alloy I used in my research is AZ31B.
I agree with your reviewer. 8HQ is not the best inhibitor for Mg alloys in general and for AZ31 in particular. We worked with 8HQ some time ago as we did not know anything better, but it was always difficult because 8HQ is light sensitive and prone to decomposition.
Check out our recent work “A new concept for corrosion inhibition of magnesium: Suppression of iron re-deposition” , Electrochemistry Communications, 62 (2016) 5-8. Of inhibitors mentioned there I would suggest to use Na 5-methyl-salicylate for AZ31.
Prior to making coating with 8HQ, test its inhibiting efficiency for your particular AZ31 as all the magnesium alloys are very sensitive to minor impurities.
Cheers!
Sviatlana
Thank you very much for your valuable and helpful answer! I will carefully consider your kind suggestion!
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