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Which of the following noble metals will improve the corrosion resistance of titanium and chromium on galvanic coupling?

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Which of the following noble metals will improve the corrosion resistance of titanium and chromium on galvanic coupling?

(a) Platinum

(b) Palladium

(c) Rhodium

(d) Platinum, palladium, and rhodium

The question was posed to me in final exam.

The above asked question is from Modern Theory Applications topic in portion Modern Theory Applications of Corrosion Engineering

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The correct option is (d) Platinum, palladium, and rhodium

Explanation: Noble metals such as platinum, palladium, and rhodium on galvanic coupling will improve the corrosion resistance of titanium and chromium by spontaneous passivation. It is due to the mixed potential of the couple lies in the passive region of titanium and chromium.

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