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Compositional changes due to the removal of one constituent in an alloy by a surface reaction

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Abstract

The depletion of an alloy by the selective removal of one element is considered when various rate laws apply. Duhamel's technique has been employed to obtain analytical solutions for the change in alloy composition with time. The effect of the depletion of the matrix by selective oxidation on the subsequent oxidation behavior of the alloy is discussed in terms of operating temperature of the alloy.

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Abbreviations

C :

concentration of solute (g cm−3)

C m :

bulk concentration of solute (g cm−3)

C(x, t) :

concentration of solute at distancex from surface after timet(g cm−3)

t :

time

x :

distance

ΔW o :

increase in weight due to takeup of oxygen

ΔW m :

change in weight due to metal entering the oxide

M o :

molecular weight of anion

M m :

molecular weight of cation

Z :

valency of cation

θ :

2M m/M o

k l :

linear rate constant (g cm−2 sec−1)

k p andk′ p :

parabolic rate constants (g2 cm−4 sec−1)

k e andk′ e :

logarithmic rate constants

D :

diffusion coefficients of solute in metal

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Authors and Affiliations

  1. Berkeley Nuclear Laboratories, Central Electricity Generating Board, Berkeley, Gloucestershire, England

    R. Hales

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Hales, R. Compositional changes due to the removal of one constituent in an alloy by a surface reaction. Oxid Met 10, 29–40 (1976). https://doi.org/10.1007/BF00611697

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  • DOI: https://doi.org/10.1007/BF00611697

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