Abstract
Magnesium-Iodine cycle is based on the four main reactions containing corrosive iodine and iodide at temperatures of 150° to 700°C, therefore the selection of construction materials for this cycle is very hard and the study of that is prime importance. The study was shared for every basic reaction and allotted to four laboratories. This part 1 report summarized the experimental results of exposure of metallic and nonmetallic materials to some. testing environments corresponding to the first stage reaction. Among the four basic reactions only the environment of the first stage reaction is an aqueous solution. And then the corrosion behavior in this environment appeared somewhat specific unlike that in the environments of the other three stages. The metallic materials selected from the viewpoint of corrosion resistance were tantalum, niobium and zirconium; and the corrosion resistance of the first two metals was almost perfect. But these three metals are very expensive and then not practical as construction material except special parts such as a nozzle. Therefore it is prefered to develop the non-porous coating method of these metals on some inexpensive metal. On the otherhand, almost all nonmetallic materials (oxide ceramics, ceramics coating, carbon products, plastics et al.) absorbed the solution of iodine and iodide without regard to their corrosion resistance. Then the practical evaluation of nonmetallic materials for the first stage reaction seemed difficult and was reserved for some time.
