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"Galvanic action between 1100 aluminum and 304 stainless steel"



2005

I want know about galvanic action between aluminum (1100 grade) and Electro galvanized steel &
Aluminum (1100 grade) and 304 stainless steel.

Any body helps me what is best combination to use, what is best method to join the above material that is by welding or by fastening?

K.G. SEKARAN
SHEET METAL MANUFACTURING - SINGAPORE
^


2005

There is insufficient information to make a call on this. Will the operating conditions be wet or dry? Will they contain chloride? Will it be hot or cold? etc etc. Taking this aside, if you weld the metals together, you will get a heat affected zone (HAZ); this can cause many problems as the composition of the HAZ will be a combination of the two metals being welded. If you use fasteners, you will need to make sure they are compatible with the two metals being joined. Furthermore, when you se fasteners you will have to drill the two lengths of metal, so (especially with the galvanised steel) you will be exposing the substrate to the risk of corrosion. However, with the above caveats, I would suggest you use fasteners, but if possible, ensure they are electrically insulating and therefore minimising the risk of galvanic corrosion because the two metals being joined will be electrically isolated. If this is not possible then I would suggest you use aluminium and stainless steel, as they will generally have the better surface corrosion resistance, but be aware of the caveats above.

trevor crichton
Trevor Crichton
R&D practical scientist
Chesham, Bucks, UK
^


2005

Are 304 or 306 stainless steel screws best for hanging aluminum rain gutters on an oceanfront building in the Pacific Northwest of the United States? Siberian storms often blow salty fog and moisture onto the roofs and gutters. If not, then what type of screws are best?

Simone Schulz
- Palo Alto, California, USA
^

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