[TR] Evapo-Rust has the formula changed?

Thu May 21 15:53:23 MDT 2020

 I'm no chemist (electrical engineer, actually) but could it be that it is easier to strip an iron atom from an oxide than it is to strip one from another iron atom.  Or, maybe it etches the solid iron as well but since it is higher density the reduction is less noticeable.
But I don't need to know how it works.  I just use it.

Dave 

-----Original Message-----
From: Don Hiscock <don.hiscock at gmail.com>
To: DAVID MASSEY <dave1massey at cs.com>
Cc: notakitcar at yahoo.com <notakitcar at yahoo.com>; Triumphs at autox.team.net <Triumphs at autox.team.net>
Sent: Thu, May 21, 2020 3:14 pm
Subject: Re: [TR] Evapo-Rust has the formula changed?

That whole business of chelation seems like a red herring, Dave, to mask what's probably a pretty simple formulation.  I can't see how chelation would convert rust.  Now a chelating agent might very well be used in the formula to bind or isolate iron removed during the de-rusting process -- they list a chelating agent on their safety data sheet -- ,but a chemist wouldn't normally think of chelation and corrosion-reversal as the same thing.
On Thu, May 21, 2020 at 3:05 PM DAVID MASSEY <dave1massey at cs.com> wrote:

 I have been told that it is a chelate, an organic compound that bonds with metal atoms.  Some formulations are used heavy metal detoxification.  I've been told that it is non-toxic and you can drink it (I haven't tried).  I've also been told by one user that he pitches the used solution onto the grass with no ill effects.
I've used it with good results but as you say, it doesn't work fast.  Over time it will start turning your parts black which, I guess, is an indication that it is time to replace it.  

Dave 

-----Original Message-----
From: Don Hiscock <don.hiscock at gmail.com>
To: bill beecher <notakitcar at yahoo.com>
Cc: Triumphs <Triumphs at autox.team.net>
Sent: Thu, May 21, 2020 2:41 pm
Subject: Re: [TR] Evapo-Rust has the formula changed?

That's the one I use all the time, Bill.  I have some things in an Evapo-Rust bath as we speak, in fact.  Check online (Amazon, perhaps) -- sometimes they have a 3.5-gallon pail with a parts basket strainer for a good price.  The stuff isn't cheap, unfortunately.  About $10-15/gallon is a decent price.
Some people initially think Evapo-Rust is like naval jelly or one of the many other phosphoric acid-based rust treatments, a brush-on/spray on system.  It's not.  It's a dilute, gentle amber watery fluid in which parts are immersed in for anywhere from hours to days.  It works for a while until it gets black and exhausted, whereupon it's pitched for fresh.  The black stuff, as best the chemist in me can guess, is reduced iron as the oxide has electrons donated to it by Evapo-Rust converting it to elemental iron or a sulfide.  I'm guessing Evapo-Rust is a reducing agent, an electron donor, not an acid like naval jelly, vinegar, muriatic acid, citric acid or the other "etching" systems commonly used.  (There's a chance, I guess, that it's some sort of buffered acid.  I don't think so, but I need to beg/borrow/steal some analytical time from friends to see what we can measure.)
On Thu, May 21, 2020 at 2:07 PM bill beecher <notakitcar at yahoo.com> wrote:

Is it this one, or the gel?

Serenity Now......
On May 21, 2020, at 12:58 PM, Don Hiscock <don.hiscock at gmail.com> wrote:

There are two suppliers of Evapo-Rust, due to some weird licensing I've never figured out.  There's "real" Evapo-Rust in the silver-gray container from Harris International Labs, and there's "licensed" Evapo-Rust from Orison Marketing.
It may be arbitrary and non-technical, but I will only use silver-gray "real" Evapo-Rust now.  I think it works better.  Which one are you referring to, Sujit?
For those who don't know the stuff, here's some recent fun I had with some old spark plugs left in a workbench drawer by the previous owners of my house twenty-plus years ago.  These plugs are older than that.  Before and after Evapo-Rust shown.https://photos.smugmug.com/photos/i-dZHgWFf/0/b8d9aad5/X5/i-dZHgWFf-X5.jpg
https://photos.smugmug.com/photos/i-GRnjRNV/0/977f00be/X5/i-GRnjRNV-X5.jpg

Here's the hose clamp from the original heater on my TR3B before and after Evapo-Rust.https://photos.smugmug.com/photos/i-JsZ3sbQ/0/fff5f613/X5/i-JsZ3sbQ-X5.jpg
https://photos.smugmug.com/photos/i-ZJtx4z7/0/4d9f81b5/X5/i-ZJtx4z7-X5.jpg

On Thu, May 21, 2020 at 12:39 PM Sujit Roy <triumphstag at gmail.com> wrote:

I like this and have been using it for a few years now. but have noticed the new batch is a different color, more clear, and appears more liquidy. It seems to wok but seems to go black quicker.
Anyone folks using this stuff noticed similar observations? Do I need to find something else?
Sujit 

-- 
Sujit Roy
Cupertino, California
https://triumphstagblog.wordpress.com/

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