Aluminium 5083

[jdcarr]

Does anyone know if this type of Aluminium (or any other) is alkaline resistant?

 

[metengr]

Here is a useful web site regarding corrosion resistance of aluminum alloys.

http://www.alu-info.dk/Html/alulib/modul/A00100.htm

I know that aluminum alloy 5083 can be prone to intergranular corrosion upon prolonged exposure to temperatures as low as 150 deg F based on Mg2Al3 precipitates at grain boundaries (similar to sensitization of stainless steels).

 

[Goahead]

From ASM Handbook, Vol. 13, Corrosion:

"Materials that contain calcium or magnesium hydroxides are alkaline and, when wet, may cause overall surface attack of bare aluminum. This early reaction produces protective films of limited solubility that resist further corrosion. Such materials cause only superficial or mild surface attack, most of which occurs during initial stages of exposure."

However sodium hydroxide solutions dissolve aluminum readily. Also the naturally produced protective oxide film on aluminum alloys is dissolved in strongly acid or alkaline solutions, so that the metal can be attacked.

http://www.welding-advisers.com/

 

[swall]

In general, aluminum and aluminum alloys are not resistant to Akaline environments. Source:"Corrosion and Corrosion Control " by Uhlig.