Abstract
The effect of water on the oxides formed on 20%Cr/25 %Ni/Nb-stabilised steel has been studied at 20 and 60° using a radiometric technique. Similar rate laws were observed for the transference of iron, nickel, manganese and cobalt to the solution although the total amount of each constituent remaining in solution depended on the solution chemistry of the individual ion. As much as 2% of the cobalt impurity could be present in solution at 60° owing to its uneven distribution in the oxides while the relatively small release of chromium observed was probably due to its state of combination in the oxide matrix. The transference of the tantalum impurity obeyed a parabolic law and 0·7% of this constituent was present in solution after the 100-dayreaction period.
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