Aluminium Corrosion in a Deep Water Marine Environment
Aluminium Corrosion in a Deep Water Marine Environment
(OP)
Could someone please provide some help and guidance towards the use of Aluminium alloys in the marine environment.
It's use would be primarily for a diving vessel.
I have consulted the Galvanic series and considered Hard Anodising the material but am concerned of the effect of scratch/damage occurring which would exposure the underlying aluminium.
I have recently been looking into Copper/Aluminium alloys but have no reliable data.
Regards
Paul Coughlin
Design Engineer
It's use would be primarily for a diving vessel.
I have consulted the Galvanic series and considered Hard Anodising the material but am concerned of the effect of scratch/damage occurring which would exposure the underlying aluminium.
I have recently been looking into Copper/Aluminium alloys but have no reliable data.
Regards
Paul Coughlin
Design Engineer





RE: Aluminium Corrosion in a Deep Water Marine Environment
A source to consider is the National Association of Corrosion Engineers (WWW.NACE.ORG). You may have to join, but they a very good (but not the only) source of corrosion information.
Regards
Dave
RE: Aluminium Corrosion in a Deep Water Marine Environment
scrathes would not present a problem.
RE: Aluminium Corrosion in a Deep Water Marine Environment
When comparing the anodized alloys to the unanodized alloys of the some copper concentration, the unanodized alloys behaved better in a humidity test than the anodized alloys. However, they behaved equally poorly in a salt spay test.
In the past, aluminum-copper alloys have been clad in a layer of pure aluminium, to enhance its corrosion properties. However, there are better modern, age hardenable / high strength aluminum alloys.
RE: Aluminium Corrosion in a Deep Water Marine Environment
RE: Aluminium Corrosion in a Deep Water Marine Environment
= = = = = = = = = = = = = = = = = = = =
Corrosion never sleeps, but it can be managed.
http://www.trenttube.com/Trent/tech_form.htm
RE: Aluminium Corrosion in a Deep Water Marine Environment
RE: Aluminium Corrosion in a Deep Water Marine Environment
5083 Al plate is used for hulls. It is easier to form curves than 6000 series.
RE: Aluminium Corrosion in a Deep Water Marine Environment
RE: Aluminium Corrosion in a Deep Water Marine Environment
RE: Aluminium Corrosion in a Deep Water Marine Environment
Will your sub be subjected to to 40' waves every 30s all day and night day after day when on deck? (Where's this, Antarctic Ocean)? Or will it be subjected to the more severe duty of occasional drenching and drying and salt fog. Sacrificial anodes address the first situation, selection of materials and coatings address the second.