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متالوژی::
نرخ سهمی ثابت
kx (G2kx ′) the parabolic rate constant, usually measured in cm2 sec1.
p (G2kp ′) the parabolic rate constant, usually measured in g2-cm4 sec1,
Parabolic rate constants for iron oxidation in air or oxygen in the
The various reported parabolic rate constants (kp values) over the range
The oxidation rates of annealed samples are typically much lower and the parabolic rate constant decreases progressively with time due to the gradual loss of contact between the scale and the iron substrate.69 The scales are also nonuniform in thickness; at locations where the scale remains in contact, it is relatively thick, whereas at locations where the scale-iron con tact was lost, it is very thin.
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