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Galvanic corrosion between aluminum and stainless used for the firewall

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  • Galvanic corrosion between aluminum and stainless used for the firewall

    Hi to all, what did you do to prevent galvanic corrosion between the aluminum angle and the stainless firewall?
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  • #2
    Gerhard,

    Galvanic corrosion happens between to different materials when touching and if an electrolyte (water, etc) is present. If you isolate them with a good paint, this should do the trick. This is a common practice on general aviation and large commercial. Same goes for carbon graphite and aluminum...sometimes you can find specs for it online

    Andy

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    • #3
      Nothing...left it as is.

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      • #4
        I think the quantiity of aluminum in the boot cowl and wings makes the anode (aluminum) big enough to far outlive me. Galvanic corrosion is occurring, but at a slow enough rate that I time out before the boot cowl or wings. I am more worried about a situation where me, the wings, and the boot cowl all become un-airworthy simultaneously. If the size of the anode (aluminum) was much smaller, it would corrode away sooner.

        You can use steel fasteners in aluminum, but not vice versa. Big cathode/little anode, and the little anode won't last very long. It seems like nobody else worries about it, so I guess I won't either. I thought about it myself a while back.

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