Do metals rust at different rates?
Why some metals do not rust is because they are less active. Look on the Periodic table. The further a element is to the right of the table, the more reactive. That is why metals like gold will rust whereas some metal further to the right like Tin will not. It is also why we made alloys, a mixture of metals, where precious metals are mixed with nonreactive metals so to make an alloy which…
Iron rusts faster in theory, but it all depends on the conditions. Steel is just Iron mixed into an alloy with Carbon and (sometimes) a few other metals. There are many different grades and types of both Iron and Steel, and they all oxidize at slightly different rates. In short, oiled or finished steel will give you a fair amount of rust resistance, but it is always necessary to maintain metals to prevent oxidation.
Why do different metals mixed together in order to construct objects such as airplane and automobile frames?
Different metals mix together to form alloys. This is done because the two metals combined have good characteristics. Example: Aluminium is lightweight, cheap, and resistant to rust. Copper is good at conducting heat and electricity.So these two metals might be combined in order to form 1 metal which is both resistant to rust, while still being able to be a good conductor.
Does specific heat capacities have anything to do with different metals in a bimetallic strip used in a thermostat?
The principal thing is linear expansion rates as temperatures rise, different metals have different rates of expansion. In a bimetallic strip, one layer of one metal is fused onto one layer of another metal with a different linear expansion rate, when heated the strip will curve along its length due to the different expansion rates, the greater the temperature rise, the more the curvature, this movement is used to trip a switch.