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What screws to use?

I am intending to fix cedar battens 38mm x 38mm to an aluminium box section 20mm x 20mm x 3mm (wall) which is then in turn fixed to a 65mm mild steel angle which has been hot dipped galvanised. Is it ok to use a galvanised screw to attach the cedar to the aluminium box or will there be a reaction which causes the aluminium to corrode? The intention is for this to be used externally so there will be exposure to rain water etc.

Luke Cooper
- Melb, Victoria, Australia
2005

Aluminum and Zinc are very close together but tin (about 7% of galvanize) is far off, however, all three metals are on the negative side of Hydrogen. Chromate the aluminum and try not to scratch it too much.

Robert H Probert
Robert H Probert Technical Services

Garner, North Carolina

2005

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