The combination of aluminum and stainless steel causes galvanic corrosion. In order to understand why you shouldn't use stainless steel and aluminum together, we first need to understand how galvanic corrosion works. Galvanic corrosion is the transfer of electrons from one material (anode) to another (cathode).
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.
When bringing aluminum and steel into contact, it's essential to prevent corrosion by using an insulating material to separate the two metals. One effective solution is to use a thin plate of non-absorbent material, such as rubber, plastic, or even a specialized insulating gasket.
This causes electrons to flow between the metals, leading to the depletion of the more galvanically active of the two. Aluminum has a higher galvanic potential than most other metals. As a result, if saltwater forms a circuit between aluminum and mild or stainless steel, the aluminum will corrode.
Options to Reduce Galvanic Corrosion Risk
Options include: Insulating dissimilar materials using non-conductive material coatings, greases, paints, treatments, or primers. Optimal protection is offered by insulating both materials.
Heat and lots of it is the fastest way, but assuming you don't have a rosebudd torch handy, one of the most effective looseners of galvanic corrosion on aluminum is water with some liquid detergent added to it. Heat will definitely help too, even if you only have a heat gun or hair drier.
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.
depends on alloy, temperature, and enviro: anywhere between one nanosecond and one million years.
Especially appropriate for steel, aluminum, and certain grades of stainless steel (e.g., 304), STEEL-IT provides an easy-to-apply and easy-to-maintain coating solution to protect materials that corrode or degrade over time while simultaneously offering a clean, professional look.
This is because dissimilar metals have different electrode potentials in which the aluminium will act as the cathode, and the galvanised steel will become the anode, resulting in a chemical reaction and a corroded appearance.
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