GENERAL-ASPECTS OF THE REACTIVE ELEMENT EFFECT

Two approaches to the reactive element effect in chromia and alumina f ormers arc discussed: industrial and fundamental. It is shown that the reactive elements change the mechanisms for loss of scale protectiven ess and as a consequence substantially increase the industrial service temperature for metallic materials. The reactive element effect is cr itical both for making further progress in understanding high temperat ure corrosion processes and in the design of materials having improved corrosion resistance.