As for metals you have to study the galvanic table. Metals that are at opposite ends of the table cannot be put together. The more cathodic (noble) metal will always win at the expense of the more anodic metal.
If you put Gold and aluminum together the aluminum will corrode.
https://www.google.com/search?q=galvanic+chart+metals&rlz=1C1CHBF_enUS869US869&tbm=isch&...
Plain steel and aluminum are close together in the chart and work nicely together and you see this done in cars all the time. But, look where stainless steel is! Way at the bottom or cathodic side. It will corrode plain steel and aluminum. Stainless steel exhaust systems are a PITA for this reason. I have to replace the header bolts in my 911 every two years because they literally melt! You can't use stainless bolts in an aluminum head! (I drive the car in the Winter.)
If you put Gold and aluminum together the aluminum will corrode.
https://www.google.com/search?q=galvanic+chart+metals&rlz=1C1CHBF_enUS869US869&tbm=isch&...
Plain steel and aluminum are close together in the chart and work nicely together and you see this done in cars all the time. But, look where stainless steel is! Way at the bottom or cathodic side. It will corrode plain steel and aluminum. Stainless steel exhaust systems are a PITA for this reason. I have to replace the header bolts in my 911 every two years because they literally melt! You can't use stainless bolts in an aluminum head! (I drive the car in the Winter.)