Inorganic slurry coatings based on a ceramic binder which contains aluminum or aluminum and silicon are very effective coatings in engines and gas turbines.

All these coatings contain much chromic acid, causing health problems when applied by the usual spraying technique. A new generation of slurry coatings with minimized Cr6+ (<0.5% weight) content has been developed.

- Ceral 114 systems as Al ceramic overlay coatings for corrosion protection of steel compressor parts. The excellent properties are presented.

- Ceral 10 aluminide silicon doped for hot corrosion protection of turbine components made of superalloys. Coating structures and properties are discussed.

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