Hydrogen embrittlement dynamic tests

In dynamic tests platinum and gold were resistant to attack under all conditions, but niobium corroded at an appreciable rate, about 7 mpy at 15 fps. The corrosion rate of niobium depended on the flow rate of the solution, and at higher flow rates somewhat higher corrosion rates were observed. Static tests showed that tantalum and chromium are corroded only slightly under most conditions. If the solution contained dissolved hydrogen, tantalum was seriously embrittled highly oxygenated uranyl-sulfate solutions at temperatures above 250 C oxidized chromium to the soluble hexavalent state, and under these conditions the rate of attack was several mils per year. 

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