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Please help me for Coloring of LM 13 piston alloy of aluminum

Hi,

I am quite new one in this field of plating. I want to get gray color on some portion of piston which is manufactured of LM13 aluminum alloy.

Please suggest me, I should use anodizing for just chemical coloring because it should have enough wear resistance. Please help me in this regard: first suggest me which method should be used and secondly give me the complete procedure for getting excellent results. I will be grateful to you all for helping me

Thanks a lot.

Salman Aziz
piston manufacturing - Lahore, Punjab, Pakistan
2005

You can anodize, dye the item grey, and then seal, Aziz.

Alternately you can hard anodize, which will give a grey to charcoal-grey color.

A simple and practical book about anodizing is Robert Probert's "Aluminum How-To"; a more exhaustive coverage of aluminum treatments is Wernick, Pinner & Sheasby's "Surface Finishing and Treatment of Aluminum and its Alloys". As you see, "Complete procedure", fills 2-volume books. Good luck!

Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey

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