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Uncoated aluminum boiler with brass group head corrosion risk? (lemmy.nowsci.com)

submitted 3 weeks ago by fmstrat@lemmy.nowsci.com to c/coffee@lemmy.world

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Hi all,

I've got an uncoated aluminum boiler to replace the flaking one in my Gaggia Classic Pro Evo. Given that aluminum boiler coupled with the brass group head will cause galvanic corrosion, what are my options?

I know I can wait for companies to get chrome plated group heads in stock, but I hear the new (since April) GCP Evos are using the brass group head and the uncoated boiler. How are they pulling that off?

Thanks.

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[–] user134450 1 points 3 weeks ago (1 children)

but that only happens while there is water there, right? so given the limited amount of contact time i think this is not a concern. aluminum has a great capacity for self-passivation too, at least the typical alloys do.

[–] Cheradenine@sh.itjust.works 2 points 3 weeks ago (1 children)

Unless the Classic has changed considerably, it may have idk, the boiler and grouphead are bolted together. So there is always water there, the element would burn out otherwise.

[–] user134450 2 points 3 weeks ago (1 children)

ah ok i mistunderstood what the group head is. if they are both permanently in contact with the water in the boiler then it would depend a lot on the water quality. Water with only a little conductivity (<100µS/cm) would not be a problem for pure aluminium or most alloys, since the aluminium would passivate much quicker than the corrosion could dig into it.
i would assume that a vessel made for boiling water is made of a highly corrosion resistant alloy but i can not know for sure.

[–] fmstrat@lemmy.nowsci.com 1 points 3 weeks ago

I'm using RPavlis water, so hopefully that works out.