Re: Galvanic corrosion and dissimilar metals

On Aug 2, 6:28 pm, " alan" <in_flagra...@xxxxxxxxxxx> wrote:
On Aug 2, 3:46 pm, Tex <Texas_Cof...@xxxxxxxxxxxxx> wrote:



Tell me davey, how is the oxide layer that forms inside the boiler
affected by your theory?

http://www.tinyurl.com/Silvia-killer

Tex

FWIW, here's what a chemical engineer had to say regarding that oxide layer:
"Even if it creates a self protecting layer of aluminum oxide when exposed
to the elements, it DOES corrode and it DOES end it's life in much faster
way than a brass boiler."
see:http://www.amazon.com/review/RTBY5ZEZH6OVW

alan

You of all people believing someone's undocumented assertion about
their professional qualifications?

*IF* what this person asserts is true, then it must be universally
true that Gaggia aluminum boilers corrode MUCH FASTER, and yet I see
machines built in the 90's with original boilers that are in near-mint
condition. Do you suppose Gaggia has different aluminum formulas that
they alternate as their moods change?

Tex

.

Relevant Pages

  • aluminum boiler yada yada
    ... Aluminum pairs with oxygen to form an aluminum oxide ... acidic there is no need to be concerned about the aluminum boilers. ... another which will promote galvanic corrosion. ... The solution to this problem is to not use filtered water ...
    (alt.coffee)
  • Re: Anyone interested in aluminum boilers? yes apparently on cg they are!
    ... immersed in water does not stay"raw" for long: ... Aluminum pairs with oxygen to form an aluminum oxide ... acidic there is no need to be concerned about the aluminum boilers. ... folks with brass/copper boiler espresso machines to sell. ...
    (alt.coffee)
  • Anyone interested in aluminum boilers? yes apparently on cg they are!
    ... Raw aluminum will corrode and oxidize: ... As long as the water used in a Gaggia is not excessively ... acidic there is no need to be concerned about the aluminum boilers. ... folks with brass/copper boiler espresso machines to sell. ...
    (alt.coffee)
  • Re: Beer Stone => Acid Detergent?
    ... Mike mentioned he has a stainless kettle, so the need for the film is not ... I use an aluminum brew pot. ... I think you're confusing beer stone with an oxide layer. ... Beer stone is the result of the minerals in the water/wort accumulating ON ...
    (rec.crafts.brewing)
  • Re: Anybody tried glueing cast aluminum parts together with epoxy?
    ... > THe issue with aluminum is that the bond is usually to the oxide layer ... > that forms rather than to the aluminum itself. ... > this layer so that the epoxy can bond to the aluminum. ...
    (rec.boats.building)