or the following pairs of alloys that are coupled in seawater, predict the possibility of corrosion; if corrosion is probable, note which metal/alloy will corrode. (a) Aluminum and magnesium (b) Zinc and a low-carbon steel (c) Inconel 600 and nickel 200 (d) Titanium and 304 stainless steel (e) Cast iron and 316 stainless steel

Question

Engineering

Pamela Ballard

27 November, 12:21

or the following pairs of alloys that are coupled in seawater, predict the possibility of corrosion; if corrosion is probable, note which metal/alloy will corrode. (a) Aluminum and magnesium (b) Zinc and a low-carbon steel (c) Inconel 600 and nickel 200 (d) Titanium and 304 stainless steel (e) Cast iron and 316 stainless steel

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Answers (1)

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Melvin Buck · Answer 1

(c) Inconel 600 and nickel 200

Explanation:

In order to make this prediction one will have to make use of the Galvanic series of metals in seawater table. The closer two metals are in the table the less likely they will corrode. The further away two metals are in the table the more likely they will corrode.

(a) Aluminum and magnesium together, there is possibility of corrosion.

(b) For the zinc-low carbon steel couple, corrosion is possible, and zinc will corrode.

(c) For Inconel 600 and nickel 200, corrosion is unlikely as both alloys appear closer on the table.

(d) The titanium and 304 stainless steel pair, the stainless steel will corrode. As long as it is below Titanium in both its active and passive states.

(e) For the cast iron and 316 stainless steel pair, the cast iron will corrode since it is below stainless steel in both active and passive states.