Secure 6061 Aluminum to Concrete 1

• Oct 23, 2020

• #2

TugboatEng

Marine/Ocean

Nov 1, 2015

11,839

Can you air gap the aluminum to concrete connection? This is your best option. Use studs with stand-offs.

 

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• Oct 24, 2020

• Thread starter
• #3

dik

Structural

Apr 13, 2001

26,063

I was thinking of a spacer that kept them from contact. My biggest concern is the galvanic corrosion of the fastener and the aluminum.

Rather than think climate change and the corona virus as science, think of it as the wrath of God. Feel any better?
-Dik

 

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• Oct 24, 2020

• #4

TugboatEng

Marine/Ocean

Nov 1, 2015

11,839

If you can air gap it, it will never sit in standing water so the galvanic corrosion problem should be minimal. Think of an aluminum wheel fastened to a steel brake rotor with steel fasteners. You can also isolate the fasteners using hard fiber washers made from materials like Garolite G-10.

 

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• Oct 24, 2020

• Thread starter
• #5

dik

Structural

Apr 13, 2001

26,063

Thanks... used an EPDM separator.

Rather than think climate change and the corona virus as science, think of it as the wrath of God. Feel any better?
-Dik

 

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• Oct 24, 2020

1
• #6

TugboatEng

Marine/Ocean

Nov 1, 2015

11,839

That will likely work but I used the air gap term because aluminum is subject to crevice corrosion. Due to the uneven surface of concrete, a rubber isolator may not seal very well against the aluminum and may create many sites for crevice corrosion. You can be the judge on that.

 

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• Oct 24, 2020

• Thread starter
• #7

dik

Structural

Apr 13, 2001

26,063

I wasn't aware of crevice corrosion... need a smooth concrete surface with smooth neoprene. Thanks... I posted this in structures for additional response...

Rather than think climate change and the corona virus as science, think of it as the wrath of God. Feel any better?
-Dik

 

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