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Mr. Electric Wizard
Samba Member
Joined: August 07, 2003
Posts: 2846
Location: Smyrna, TN
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 Posted: Thu Oct 22, 2009 10:49 am Post subject: |
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I don't think its the magnesium that POR-15 has an issue with, it's heat.
I don't think it would last long at all on an engine.
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skyto
Samba Member
Joined: November 24, 2003
Posts: 177
Location: Finland
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| Posted: Thu Oct 22, 2009 12:58 pm Post subject: |
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| the2ndcashboy wrote: |
| In aviation we use dilute chromic acid to neutralize corrosion in magnesium. After its neutralized, you put an epoxy coating on it to seal out moisture. If you just brush off the loose stuff and slap JB on it the corrosion is just going to keep eating the part underneath. |
Are there any specific directions how to apply chromic acid to magnesium alloys? I've read it's carcinogenic and care should be taken etc.. how does the surface look afterwards? |
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the2ndcashboy
Samba Member
Joined: March 19, 2007
Posts: 827
Location: Houston
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| Posted: Fri Oct 23, 2009 1:22 am Post subject: |
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| IIRC its a 10:1 water:chromic acid mix. You clean off any loose stuff, apply the chromic acid solution, let it sit for 10-15 minutes, then wash it off with water and dry thoroughly. After its dry you apply an epoxy paint to prevent future corrosion (sorry, I don't know where you could get any, but I could probably get you a mil-spec number if you really need it). The surface looks pretty much the same after your done as before you started, expect it will have an epoxy coating on it. If there was any pitting etc. you'll still be able to see it. The important thing is that the corrosion is stopped. |
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coreydw
Samba Member
Joined: August 06, 2015
Posts: 16
Location: Columbiaville, Mi
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| Posted: Sat Aug 08, 2015 5:49 pm Post subject: |
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| Ha! Its 2015 and seven year old posts are helping me out. I have an AE case I want to put in a sand rail with the same problem. Thanks guys. |
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