Re: [PSUBS-MAILIST] protecting aluminum parts

["Emile" <2stroke@hetnet.nl>]

May I add another 2 corrosion causes Adam; gavanic corrosion (bronze
propeller/ steel hull) and stress corrosion (high tension parts corrode
quickly)

regards, Emile

----- Original Message ----- 
From: "Adam Lawrence" <adteleka@in-tch.com>
To: <personal_submersibles@psubs.org>
Sent: Wednesday, January 07, 2004 7:13 PM
Subject: Re: [PSUBS-MAILIST] protecting aluminum parts


> Oxygen accelerates corrosion attack, and the corrosion rate goes into
orbit
> under higher atmospheric pressures. Polishing the part would have removed
> the passive oxide film at the surface, giving the oxidizing agent (sea
> water) a fresh start. 316 has higher Ni and Mo making it a better choice
> then 304.
>
> Adam
>
>
> ----- Original Message ----- 
> From: <VBra676539@aol.com>
>
> > Hmmm. Maybe one of our metal guys will take a shot at that. The only
thing
> I
> > ever did similar was replace a piece of 304 stainless in the oxygen
system
> on
> > one of the boats when it turned to rust on a single dive. It should have
> been
> > 316 to start with, but we were all surprised that it rusted like that. I
> > wonder if we could have polished it out and by doing so, sealed the
pores
> and maybe
> > made it shinier and less likely to do it again? Very strange. Vance
>
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