How much does aluminium expand when oxidizing?
How much does aluminium expand when oxidizing?
(OP)
Hello everyone,
I was wondering how much certain metals or more specifically aluminum expand when they oxidize.
On site we encountered a large pit on a submerged aluminum pipe. The pit was about 7.06 cm^3 in volume (if you were to approximated the volume as a hemisphere), after removing the corrosion the only thing remaining was a dimple of about 0.26 cm^3. This would give the corrosion an expansion ratio of over 27 which seems a bit high to me.
Cheers,
Alex
I was wondering how much certain metals or more specifically aluminum expand when they oxidize.
On site we encountered a large pit on a submerged aluminum pipe. The pit was about 7.06 cm^3 in volume (if you were to approximated the volume as a hemisphere), after removing the corrosion the only thing remaining was a dimple of about 0.26 cm^3. This would give the corrosion an expansion ratio of over 27 which seems a bit high to me.
Cheers,
Alex





RE: How much does aluminium expand when oxidizing?
these look like easy calculations from oxydes stoechiometry, material balance and densities, considering compact corrosion products
i leave it to you !
but porosity migth also play a role... see if you need evaluation after initial calculation above.
regards
RE: How much does aluminium expand when oxidizing?
RE: How much does aluminium expand when oxidizing?
RE: How much does aluminium expand when oxidizing?
= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, Plymouth Tube