![]() An abstract of a paper (in Japanese) by Nishimura and Hiramatsu ( 2) appeared in the same issue of Platinum Metals Review this reported, inter alia, the beneficial effect of 2 per cent additions of platinum or palladium in reducing the corrosion rate of titanium in 20 per cent hydrochloric acid at 25☌. In that article it was suggested that “the general principle of alloying with small quantities of noble metals may find use in further increasing the passivity of metals such as titanium, zirconium and tantalum towards acids”. A recent article in this journal ( 1) summarised some of the work of Tomashov and his colleagues in the course of which the influence of small additions of platinum metals to 18-8 type stainless steels on their resistance to acids was explored.
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