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· The top diagram shows the parabolic
oxidation curve for copper
and some copper alloys. The alloying elements alter
the oxidation rate, but the curve follows the same parabolic form. These
oxides are all protective and decrease the rate of oxidation as their thickness
increases.
· If the oxide cracks
under tensile stress during growth, a linear oxidation can occur, as shown
opposite for magnesium
at several oxidation temperatures.
· Linear oxidation does not protect the substrate and
results from a superposition of a family of parabolic growth curves.
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