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9Cr–3W (wt.%) ferritic steels with different amounts of Co, Al and Mo added were oxidised in air and wet air at 650°C for up to 9638h. Steels with only 1.90wt.% Al added was not passivated in air and wet air. They were passivated in air but not in wet air when 3wt.% Cr was added either alone or with 1.83wt.% Al. Long term passivation was achieved in both air and wet air when 2.22wt.% Al, 3wt.% Co...
Two 10wt.% Cr steels containing 1.90 and 2.33wt.% Al respectively were oxidised in air at 650°C. The scales formed on the steel with 2.33wt.% Al were θ-Al 2 O 3 and α-Al 2 O 3 with differing parabolic rate constants. The scales formed on the steel containing 1.90wt.% Al consisted of multiple layers of Fe-oxides and the amount of oxidation followed logarithmic kinetics...
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