Aluminum Corrosion in Pebble Lime Plants.
Aluminum Corrosion in Pebble Lime Plants.
(OP)
Can you give guidance on aluminum corrosion in pebble lime plants? The literature suggests good performance of aluminum in the presence of lime but we are experiencing corrosion in this environment. The aluminum is outdoors and will be covered with CaCO3 and CaO (which will turn to Ca(OH)2 with humidity and rain). Would this combination attack the aluminum or is something else in the environment causing the corrosion.
Thanks for your help.
Thanks for your help.





RE: Aluminum Corrosion in Pebble Lime Plants.
Aluminium is unsatisfactory against saturated Ca(OH)2
RE: Aluminum Corrosion in Pebble Lime Plants.
RE: Aluminum Corrosion in Pebble Lime Plants.
Thank you.
RE: Aluminum Corrosion in Pebble Lime Plants.
Re "The literature suggests good performance of aluminum in the presence of lime." -- What literature? I suggest that this is true only in a totally anhydrous atmosphere, e.g., on the surface of the Moon.
Lime absorbs moisture from the air, creating hydrated lime with a pH of 12.4, which caustically attacks the aluminum. This is the same reaction as Al with fresh concrete.
The attack of Al by alkalies is well-known:
At pH > 10,
Al(OH)3 (solid) + OH- ---> Al(OH)4- (aqueous)
RE: Aluminum Corrosion in Pebble Lime Plants.
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