Corrosion of a metallic alloy occurs by martensitic reaction

Corrosion of a metallic alloy occurs by: martensitic reaction electrochemical reaction vulcanization reaction biotitic transformation Chain scission If two plates of Montel (70Ni-30Cu) are joined by a Cd screw and this assembly is placed in sea water: Montel and Cd will form a glass with H^+ ions from water Cd will corrode there will be no corrosion Montel (70Ni-30Cu) will corrode both will corrode If two plates of Ti are joined by a silver screw and this assembly is placed in sea water: Ti will corrode Ag will corrode there will be no corrosion both will corrode Ti-Ag will form a glass with H^+ ions in water

Solution

1) the answer is electrochemichal reaction, as it leads to gradual degradation of metal alloy as it converts metal into a stable form of oxides and hydroxides

2) the answer is cd will corrode as monel is highly resistant to corrosion wheras cadmium is not corrosion resistant hence it will corrode

3) the answer is ag will corrode , titanium is highly resistant because it has layer of oxide film on it which acts as a resistance to corrosion while silver will corrode when placed in sea water