Abstract
With the object of finding a material more resistant than stainless steel for use in the catalytic production of nitric acid, a study was made of the corrosion of stainless steels (304 L, URANUS 65) and titanium alloys (Ti 125, Ti 260) In contact with platinum-rhodium alloy in nitric acid solutions. The corrosion potential of stainless steel, when in contact with Pt-Rh, shifts towards more positive values, i.e., it passes from the passive into the transpassive region, whereby the corrosion rate of stainless steel is greatly Increased. The corrosion potential of titanium alloy, in contact with platinum-rhodium alloy in nitric acid solutions, also shifts towards more positive values, but here the corrosion rate of the alloy is not increased, since the system Ti/Pt-Rh alloy remains in the passive region.
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