Milk and aluminum
Milk and aluminum
(OP)
Hi there
hope everybody is fine
Please, I'd like to ask you as follows
I have had an inspection of a cold room where there is fresh milk.
Into the room there is a cooler with aluminum fins thant has been corroded.
My question is:
I kow that in cold rooms where there are diary product stainless steel is recommended.
I can't find any literature reference concerning aluminum and milk.
My point is: can aluminum be utilized with milk ?
Many thanks
hope everybody is fine
Please, I'd like to ask you as follows
I have had an inspection of a cold room where there is fresh milk.
Into the room there is a cooler with aluminum fins thant has been corroded.
My question is:
I kow that in cold rooms where there are diary product stainless steel is recommended.
I can't find any literature reference concerning aluminum and milk.
My point is: can aluminum be utilized with milk ?
Many thanks





RE: Milk and aluminum
Bovine milk usually has a pH of 6.7, which usually is not a problem for aluminium.
RE: Milk and aluminum
Aluminum is a series 7000 fin.
No surface coating
thanks
RE: Milk and aluminum
Lactic acid develops in cow’s milk as a result of bacteria fermenting (breaking down) the lactose. Freshly expressed milk does not contain lactic acid. It is only after a short period of time that the concentration builds up due to the input of bacteria. This means that lactic acid can be used to assess the quality of milk and its state of preservation.
Here are some corrosion charts:
http://www.smt.sandvik.com/en/materials-center/cor...
http://www.smt.sandvik.com/en/materials-center/cor...
http://www.americanconduit.com/wp-content/uploads/...
Guess that is why most of the equipment in milk plants is fabricated from stainless.
RE: Milk and aluminum
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P.E. Metallurgy, Plymouth Tube
RE: Milk and aluminum
RE: Milk and aluminum
It is better to have enough ideas for some of them to be wrong, than to be always right by having no ideas at all.
RE: Milk and aluminum
RE: Milk and aluminum
It is better to have enough ideas for some of them to be wrong, than to be always right by having no ideas at all.
RE: Milk and aluminum
Possibly a Galvanic corrosion depending on the material of the actual cooler?
RE: Milk and aluminum
However, there is a general statement in Section 6 regarding corrosion that should effectively prohibit aluminum fins for this application:
"Materials shall be corrosion resistant in the intended end use environment."
RE: Milk and aluminum
My money is on them splashing it with sanitation chemicals (low pH and/or high Cl).
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P.E. Metallurgy, Plymouth Tube
RE: Milk and aluminum
I think the sanitation chemicals is a good theory. But, aluminium is usually more sensitive to high pH conditions. So, how about sodium hypochlorite, which is a common sanitation chemical and is basic?