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The theoretical consideration on the production of hydrogen from water was performed by means of thermochemical cycle. A thermochemical process uses heat instead of work to dissociate water into hydrogen and oxygen. The principle by which a reaction with an unfavorable △G can be the reaction cycle with a favorable △G by dividing it into several steps is discussed. A systematic study of three-step processes was performed by reacting with Metel Oxide. The result of the study is that a three-step reaction cycle probably does not exist. Dozens of Cr-family cycles and Fe-family cycles were proposed but only six poss ible reaction cycles were obtained. These will have the great value of the basic data for performing the experiments.
To improve properties of wear resistance and anti-corrosion of the trivalent chromium platings, oxinitrocarburising and steam oxidation were conducted. Armophous trivalent Cr platings could be transformed to chromium carbides of high hardness, that showed low friction and wear rate. Even though micro-cracks were within as platings, superior anti-corrosion property was obtained by these treatments due to healing of cracks at the interface between the trivalent chromium platings and substrate.