Duplex phase CrAl coating for improved corrosion/oxidation protection

摘要

The coating comprises an outer zone that comprises alpha -chromium phases in a matrix of a mixture of mixed crystals comprising metallic main constituents of aluminum and chromium, and an inner zone that comprises a mixed crystal zone comprising metallic main constituents of aluminum and chromium, where proportion of chromium in a total coating is greater than 30-90 wt.% and the aluminum content in the total coating is 10-40 wt.%. The component is formed by an alloy having a metallic main constituents. The coating comprises an outer zone that comprises alpha -chromium phases in a matrix of a mixture of mixed crystals comprising metallic main constituent of aluminum and chromium, and an inner zone that comprises a mixed crystal zone comprising metallic main constituent of aluminum and chromium, where proportion of chromium in a total coating is greater than 30-90 wt.% and the aluminum content in the total coating is 10-40 wt.%. The component is formed by an alloy having the metallic main constituent. The amount of chromium present in the outer zone is 10-40 wt.% and in the inner zone is >= 70 wt.%. The proportion of the main constituent in the inner zone is >= 30 wt.%. The coating further comprises 1-15 wt.% of oxides, and a base material of the component to be coated. An independent claim is included for a process for producing a coating for protecting a component against high temperatures and aggressive media.