The effects of palladium (Pd) additions on the localized and uniform corrosion of titanium (Ti) were examined by comparing the corrosion behavior of Ti Grade 2 (UNS R50400) to that of Pd-bearing Ti Grade 7 (UNS R52400). Pd additions were found to increase the pitting (Epit) and repassivation (Erp) potentials such that Epit for Ti Grade 2 was significantly lower than Erp for Grade 7 in chloride (CL) solutions. Under conditions where Ti Grade 2 was found to be susceptible to crevice corrosion, Ti Grade 7 was observed to be immune. Though Pd additions did significantly affect the localized corrosion resistance of Ti, Pd did not appear to influence the passive corrosion rate nor did it mitigate the deleterious effects of fluoride (F−). The effect of Pd on Ti can be explained through the effects Pd has on the hydrogen evolution reaction.

Subject
Pits, Materials, Corrosion rate, Passive current, Dissolution, Passive corrosion, Open circuits, Crevices, Current densities, Crevice corrosion, Pitting, Titanium alloys, Chlorides
Keywords:
Titanium, palladium, F−, hydrogen evolution, pitting corrosion, crevice corrosion, passive corrosion
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2001
Association for Materials Protection and Performance (AMPP)
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