Question

For the following pairs of alloys that are coupled in seawater, predict the possibility of corrosion; if corrosion is possible, note which metal/alloy will corrode. (10 points) (a) 316 stainless steel (passive) and titanium (b) Bronzes (Cu-Sn alloys) and Monel (70Ni–30Cu) (c) Iron and steel and Inconel (80Ni–13Cr–7Fe) (active) (d) Magnesium and Cadmium (e) CoCrMo alloy and titanium (CoCrMo alloy is located in-between silver and 316 stainless steel (Passive) in the galvanic series)

Answer 1

(a) 316 stainless steel (passive) and titanium are coupled in sea water, so corrosion is possible. Here, titanium will corrode.

(b) For Bronzes (Cu-Sn alloys) and Monel (70Ni–30Cu), corrosion is possible. Here, monel will corrode.

(c) For Iron and steel and Inconel, corrosion is possible. Here, inconel wil corrode.

(d) For Magnesium and Cadmium couple, corrosion is possible. Here, cadmium will corrode.

(e) For CoCrMo alloy and titanium couple, corrosion is possible. Here, titanium will corrode