Dissimilar metals in fuel tank

[Lou]

I'm in the process of building my fuel tanks. On the insiide I was
going to have stainless steel bolts going through the tank to hold to
an aluminum bracket. I really don't know much about the metal industry
but do remember that there can be a problem with dissimilar metals. Do
anyone know if this will be a problem, especially with the fuel?
Lou

[Richard Lamb]

Lou wrote:

> I'm in the process of building my fuel tanks. On the insiide I was
> going to have stainless steel bolts going through the tank to hold to
> an aluminum bracket. I really don't know much about the metal industry
> but do remember that there can be a problem with dissimilar metals. Do
> anyone know if this will be a problem, especially with the fuel?
> Lou
>


http://www.metal-mart.com/Guides/Galvanic.htm

[Jason]

> > I'm in the process of building my fuel tanks. On the insiide I was
> > going to have stainless steel bolts going through the tank to hold to
> > an aluminum bracket. I really don't know much about the metal industry
> > but do remember that there can be a problem with dissimilar metals. Do
> > anyone know if this will be a problem, especially with the fuel?
> > Lou

What's the difference between active and passive stainless steel then ? How
can you tell the difference between the two for a given stainless steel
screw or bolt ?

[[email protected]]

Jason wrote:
> > > I'm in the process of building my fuel tanks. On the insiide I was
> > > going to have stainless steel bolts going through the tank to hold to
> > > an aluminum bracket. I really don't know much about the metal industry
> > > but do remember that there can be a problem with dissimilar metals. Do
> > > anyone know if this will be a problem, especially with the fuel?
> > > Lou
>
> What's the difference between active and passive stainless steel then ? How
> can you tell the difference between the two for a given stainless steel
> screw or bolt ?

IIRC 'passivation' is a process wherein the stainless steel is treated
with
acid to remove any iron from the surface so that only nickle and
chromium oxides are in contact with the environment.

IOW, you send your weldment out to be passivated after you
hare done fabricating it. FOr bolts, you'd buy them already
passivated, assuming such things are available.

--

FF