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Ted Mooney, P.E. RET
Pine Beach, NJ
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for Metal Finishing since 1989
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Type II Aluminum Anodize - max temp limit in a vacuum
I am looking for data on the maximum Operating Temp for Type III aluminum anodize in a vacuum. I see alot of info on the max process temp and and information on Alodine in a vacuum but nothing on the max operating limit of this type of coating. Can I take this coating to 350C at 10-7 torr? Will it break down or outgas?
Keith Ferrara
Mechanical Engineer - Shelton, Connecticut, USA
February 15, 2011
I will not address the out-gas because we do not know the "hygiene" of the particular anodizing process line, but we can document that above 80& C the coating starts to crack because the coefficient of expansion of the aluminum oxide is only 1/5 th that of the underlying aluminum metal
Robert H Probert
Robert H Probert Technical Services
Garner, North Carolina
February 17, 2011
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