Although aluminum reacts negatively to stainless steel, large surface areas of aluminum to stainless steel can be acceptable depending on local environmental conditions. Severe corrosion is likely to take place in a marine environment.

Can aluminum be in contact with steel?

“Note that aluminum is close in activity with steel. However, they are still dissimilar metals and are subject to considerable galvanic corrosion when in contact in a corrosive atmosphere.

How does aluminum interact with steel?





When aluminum and stainless steel are used in an assembly together, the electrons from the aluminum will begin to transfer into the stainless steel. This results in the aluminum weakening. This weakened aluminum causes it to deteriorate at a much faster rate. This can lead to an extended life of the stainless steel.

Can stainless steel touch aluminum?

Stainless steel is an alloy of carbon steel that is, itself, resistant to corrosion. However, stainless steel is reactive with aluminum, and when a stainless steel screw is in contact with an aluminum base metal, the aluminum is likely to corrode.

Will aluminum touching steel cause corrosion?

It is unusual to see galvanic corrosion on aluminum in contact with stainless steel (passive). In contrast, contact between copper, bronze, brass and different kinds of steel alloys (passive and active) and aluminum can cause severe corrosion, so it is advisable to provide insulation between the two metals.

What metal will not corrode with aluminum?

Coated Steel





With a thick enough coating, even a very reactive metal like brass can be used on an aluminum structure without corrosion. Since stainless steel remains one of the least reactive metals without coating, it’s smarter to use it as the base material.

How do you isolate aluminum from steel?

You electrically insulate the aluminum from the steel. The best way to do this is to use bolts and nuts to make the joint. Use an isolating coating or paint on the aluminum and the steel to isolate them electrically.

Why can aluminum be separated from iron and steel?

The separation of metal parts occurs according to two different processes: ferrous metals such as steel are separated thanks to the use of powerful magnets, while for metals such as aluminum, separation is possible thanks to the use of electronic currents.