As an electrician I use "dielectric paste" on all aluminum connections, why
not on the hose?

Paul

----- Original Message -----
From: "Jim Akiba" <syncrolist@BOSTIG.COM>
To: <vanagon@GERRY.VANAGON.COM>
Sent: Thursday, November 29, 2007 6:39 PM
Subject: Re: ONE MAN only out of many

To answer the most important question, it's likely the lack of
movement of the coolant in that area.  Check out this abstract on an
sae tech paper titled "Investigation of Fluid Circulation Effect on
the Internal Corrosion Resistance of Automotive Heater Core".

The Al-Si cladding they talk about on the cores would be roughly
equivalent to the common AL-Si alloys used in casting such parts as
water pump inlets etc, so I don't see any reasons the last
sentence(and more importantly its logical inverse) wouldn't also hold
true. If you are interested in the exact mechanism that causes this, I
can dig further.

"An experimental test bench has been developed to study the effect of
flow on the corrosion behavior of the internal surface of heater core
tubes. The experimental device allows the electrochemical behavior of
the system to be investigated under different liquid compositions,
different temperatures (between 40 and 80�C) and different fluid
velocities (between 0.5 m/s and 1.5 m/s) at different test duration
(up to 100 h). The study is focused on the water side corrosion
resistance of brazed AA4343/AA3003*/AA4343 material, i.e., the
residual Al-Si cladding. The increase of the temperature has a
preponderant influence on the corrosion rate by comparison with the
variation of the fluid velocity. The increase of fluid velocity rather
limits the corrosion degradation."

Jim Akiba

On 11/29/07, Zoltan Kuthy <zolo@foxinternet.net> wrote:
> Probably the most important question to answer is; what makes corrosion
> between rubber and aluminum?  The other is; how to avoid it?
> Although, I have put this question up more than once within a year, nobody
> even attempted to try to answer it, but ONE.
> This list is fighting and dreading this symptom the most, yet there is not
> enough knowledge to know how to stop it.
> Is there more than ONE out of the hundreds of members who knows, or at
> least think he knows?
> Anyone?
> Zoltan
>

--
No virus found in this incoming message.
Checked by AVG Free Edition.
Version: 7.5.503 / Virus Database: 269.16.8/1153 - Release Date: 11/26/2007
9:08 PM