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Corrosion of Magnesium with Unpassivated SS

Corrosion of Magnesium with Unpassivated SS

Corrosion of Magnesium with Unpassivated SS

(OP)
Can an unpassivated Stainless steel plate become passivated when connected to similar-sized magnesium alloy casting in a humid environment?  Is it generally undesireable to connect ANY SS to magnesium if the magnesium is load bearing?

RE: Corrosion of Magnesium with Unpassivated SS

There is a good chance that the magnesium will be corroded in contact with unpassivated stainless steel. I suggest to read the former discussions about aluminium.

Magnesium is one of the least noble metals used. You can even burn it.

Edwin Muller
KEMA Power Generation & Sustainables
Arnhem, The Netherlands
E-mail      e.f.muller@kema.nl
Internet: http://www.kema-water.nl


RE: Corrosion of Magnesium with Unpassivated SS

It is inadvisable to connect any stainless steel to a magnesium alloy if there is a corrosion source and electrolyte.  This galvanic couple will result in rapid corrosion/dissolution of the magnesium.

RE: Corrosion of Magnesium with Unpassivated SS

If you need to have a SS component in contact with a Mg component, you will need to address the galvanic corrosion potential.  Coatings can be used to minimize the problem, but a great deal of attention must be paid to details like anode to cathode ratio, coating damage, etc.

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