Topic summary
Anodized
Extracted from the Wikipedia article Anodizing.
Aluminium
Anodized coatings have a much lower thermal conductivity and coefficient of linear expansion than aluminium. As a result, the coating will crack from thermal stress if exposed to temperatures above 80 °C (353 K). The coating can crack, but it will not peel. The melting point of aluminium oxide is 2050 °C (2323K), much higher than pure aluminium's 658 °C (931K). This and the insulativity of aluminium oxide can make welding more difficult.