53 Corrosion Resistance

A couple of attributes contribute to the corrosion resistance of IC-221M. The aluminum at the surface oxidizes to protect the bulk of the alloy from corroding substances, including oxygen. The aluminum content of the bulk alloy is set at a level to maximize its corrosion resistance to other materials, such as sulfuric acid.

Carbon has a low affinity for aluminum, giving the Ni3Al alloy excellent resistance to a carburizing atmosphere and coking. This resistance is maintained to 1100°C (2012°F).

The resistance of IC-221M to these conditions is illustrated in Fig. 5.4.

FIGURE 5.4 Reducing carburizing environment for Ni3Al vs. nickel-based alloys.
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