can be greatly increased by protective coatings and this is a growing industry of considerable economic importance. Coatings are used in both aqueous and high temperature applications. Coal gasification, electric power generation, and waste incineration involve severe conditions and thick coatings have proved eVective. Diesel and gas turbine engines are subject to high temperature corrosion and highly beneficial coatings have been developed. Some nuclear power systems also rely on coatings. Factors that must be taken into account include substrate compatibility, adhesion, porosity, the possibility of repair or recoating, interdiVusion, the eVect of thermal cycling, resistance to wear and corrosion, and cost. T his review of alternative systems emphasises the necessity for the coating and substrate to be designed as an integrated whole, bearing all of these considerations in mind.

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