If "生銹" is translate as this term rusting, it means the oxidation of the surface. In the case of iron, the rusting is due to the formation of oxides and the surface of the iron becomes brown in color. And in the case of copper, it will form the blue copper. If "生銹" is explained as rusting, due to the inertness of silver and gold towards oxidation. The silver and gold will not rust.
Alternatively, if "生銹" is translated as tarnishing, it means the darkening of the metal no matter what the cause is. In this case, silver will "生銹" but gold will not due to its extremely low reactivity. In case of silver, since silver is very reactive towards the sulfide, the silver can easily turn black in the presence of sulfur containing compound. Also, if silver contact with some nitric oxide or chlorine in the swimming pool, it can also change color. In this case, silver can "生銹".