Re: Painting/powdercoating magnesium wheels
[Re: topside]
#222734
02/13/09 12:22 AM
02/13/09 12:22 AM
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Joined: Nov 2005
Posts: 15,118 85086
moparpollack
Lil Herman
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Lil Herman
Joined: Nov 2005
Posts: 15,118
85086
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Is there a chance that heating magnesium up might cause the wheels to start on fire? Magnesium will burn but I don't know the degree of tempature?
56 Plaza 63 D100 step side 67 Coronet, 68 Roadrunner, 69 Super Bees, 69 Coronet 500 convertible, 70 Roadrunner Post, 79 D150 360, and a severe case of Mopar a,d,d
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Re: Painting/powdercoating magnesium wheels
[Re: moparpollack]
#222736
02/13/09 12:53 AM
02/13/09 12:53 AM
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Joined: Jan 2003
Posts: 20,733 A collage of whims
topside
OP
Too Many Posts
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OP
Too Many Posts
Joined: Jan 2003
Posts: 20,733
A collage of whims
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400 degrees (bake temp for powdercoating) is not a problem. If you do catch magnesium on fire, nothing will put it out, but it won't ignite at 400. My concern is prep method & adhesion. Soda blasting is supposedly out, plastic media might work, scuffing with red Scotchbrite pads may be best. If there are any problems with blushing, paint is less of a problem to remove than powdercoating. There are some stains in the wheels that are below or through the P&O, and haven't polished out. I can reproduce the color, and protect the magnesium, by either painting or coating. From what I've heard, water & unprotected mag don't mix, which complicates prepping the wheels.
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Re: Painting/powdercoating magnesium wheels
[Re: Cab_Burge]
#222738
02/13/09 12:54 AM
02/13/09 12:54 AM
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Joined: Jan 2004
Posts: 27,347 Today? Who Knows?
1_WILD_RT
Management Trainee
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Management Trainee
Joined: Jan 2004
Posts: 27,347
Today? Who Knows?
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Quote:
powdered magnesium will burn bright and hot, real hard to put out, I'm not sure about cast magnesium Maybe someone more knowledgable will kick in on that. As far as powder coating magnesium I probally wouldn't due to a bad expereince with powder coating aluminum parts
Aluminum can show worming when powder coated, looks like pock marks & usually it shows up on parts that had minor visable problems before coating but looks alot worse after the coating process...
Magnesium probably would do the same thing being a non-ferous metal..
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Re: Painting/powdercoating magnesium wheels
[Re: 1_WILD_RT]
#222739
02/13/09 01:36 AM
02/13/09 01:36 AM
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Joined: Jan 2003
Posts: 20,733 A collage of whims
topside
OP
Too Many Posts
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OP
Too Many Posts
Joined: Jan 2003
Posts: 20,733
A collage of whims
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Thanks for the replies; I'm leaning towards painting just in case there's a problem, and leaning that way further now. Good idea about heating them to gas off impurities; I doubt the powder coater will do that so I can take the wheels away and paint them, but I could probably do that in my oven (or maybe not). From what I've read on mag, annealing it and letting it cool is required after machining or cutting to avoid stress risers, but nothing I've read on the topic so far talks about impurities, or whether mag continues to out-gas or blemish if painted. I know of a set of Halibrands that showed some blushing after being powdercoated clear, and the clear actually yellowed; maybe that was the mag continuing to degrade or affect the clear? They'll need to be color-coated I think because of the stains, and I'm thinking a flat or satin clear over that for protection. I'm going to refinish the aluminum rear wheels the same color, but I'm not expecting problems there.
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Re: Painting/powdercoating magnesium wheels
[Re: topside]
#222740
02/13/09 07:34 AM
02/13/09 07:34 AM
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Joined: Jul 2005
Posts: 428 wappinger falls new york
Jimi_Vignogna
mopar
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mopar
Joined: Jul 2005
Posts: 428
wappinger falls new york
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hi i do powdercoating, everything i coat, will go in the oven before i coat it, on cast aluminum (wich is close to magnesium)to prep it for coating, i only blast it with aluminum oxide, then cook it,blast it again,clean and prep it for coating, reheat it to make sure it has out gassed,bring it to 300degrees and shoot it hot.
i find the biggest problem is water,oils or solvents can be removed with just about any thing and remnants can be burned off, just like when welding aluminum or mag the part needs to be preheated to remove water.
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Re: Painting/powdercoating magnesium wheels
[Re: topside]
#222751
02/15/09 04:22 PM
02/15/09 04:22 PM
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Joined: Nov 2005
Posts: 15,118 85086
moparpollack
Lil Herman
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Lil Herman
Joined: Nov 2005
Posts: 15,118
85086
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brake fluid works also
56 Plaza 63 D100 step side 67 Coronet, 68 Roadrunner, 69 Super Bees, 69 Coronet 500 convertible, 70 Roadrunner Post, 79 D150 360, and a severe case of Mopar a,d,d
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