Sound technical content, curated with aloha by
Ted Mooney, P.E. RET
Pine Beach, NJ
The authoritative public forum
for Metal Finishing since 1989
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Temperature effects on Anodized Aluminum Parts
Our company current heat shrinks several aluminum parts together and we are thinking about requiring a hard anodized surface on one of these parts. This surface is also a sealing surface for a gland type o-ring detail. My question is that if we hard anodize the part, what is the maximum temperature we can apply to the part for heat shrinking and not see any surface degradation or cracking which could cause a leak?
Brett BlanchardEngineering - Knoxville, Tennessee
June 19, 2008
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June 20, 2008 Look up the coefficient of thermal expansion for your aluminum alloy and for aluminum oxide. BIG difference and the hard anodize will probably crack and possibly delaminate. - Navarre, Florida Sheasby and Pinner say, "fine cracks may be observed at 80-100C - - cracking is caused by the low coefficient of expansion of the anodic film which is approximately 0.2 times that of the metal,"  Robert H Probert Robert H Probert Technical Services  Garner, North Carolina  June 20, 2008 |
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