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Anodized aluminum tank

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lucky phil:

--- Quote from: Triple Jim on March 23, 2015, 04:50:54 PM ---It's normally not that it can't be anodized, but that it won't be a bright, clear coating.

--- End quote ---
Thats what I meant. 2000 series sheet can be anodised but it leaves a powdery residue/surface which is effectivley rubbish.
Ciao   

NCAmother:
Malleable alloys like 5000 and 6000 series can be anodized.  These are usually the series used in hand formed tanks.

boatdetective:
You can anodize it easily enough- but the surface won't look like a mirror anymore.

Moto Fugazzi:
Newer automotive paints are catalyzed and UV resistant (according to my painter) and should hold up well. Everything I've had that was anodized has faded to a weird color over time.
Ken

Triple Jim:

--- Quote from: Moto Fugazzi on March 24, 2015, 09:19:04 AM ---Everything I've had that was anodized has faded to a weird color over time.
--- End quote ---

Most of the anodizing you see is clear anodized, and then dyed to color with an organic dye.  Those dyes fade over time, sometimes pretty quickly, especially if exposed to sunlight.  There are anodizing processes that create the color in the oxide coating, and it won't fade.  Unfortunately those colors are not always desirable.  The Martin Hardcoat process makes a dark grey color that won't fade on alloys like 6061, and that can look good in some applications.

The good news is that anodizing of any color is a porous oxide coating, and makes a great base for paint.  Where aluminum is often difficult to get paint to adhere to in the long term, anodized aluminum usually isn't difficult.

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