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Which of the following metals have high resistance to crevices in quiet seawater?

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Which of the following metals have high resistance to crevices in quiet seawater?

(a) Hastelloy C

(b) Titanium

(c) Hastelloy C and Titanium

(d) Nickel-copper alloy

The question was asked in semester exam.

This question is from Environments topic in section Other Environments of Corrosion Engineering

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The correct option is (c) Hastelloy C and Titanium

For explanation I would say: Hastelloy C and titanium have high resistance to crevices in quiet seawater. Due to this, these metals are used for various corrosive seawater applications. Whereas nickel-copper alloy shows less resistance.

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