Wear breathing protection when doing any work on galvanized stuff...
On Thu, Nov 5, 2020, 9:41 AM Ken Hohhof <[email protected]> wrote: > The bottom line is, if it’s a Rohn tower, it’s almost certainly galvanized > not stainless. > > > > If there’s some rust on the cross members and step bolts, it’s probably > that people stepping on them wore through the galvanizing? You could > remove the rust with a steel brush and spray with cold galvanizing, but if > it’s where people step, that’s not going to last. Question maybe is > whether it’s cosmetic or structural. > > > > > > *From:* AF <[email protected]> *On Behalf Of *[email protected] > *Sent:* Thursday, November 5, 2020 10:28 AM > *To:* AnimalFarm Microwave Users Group <[email protected]> > *Subject:* Re: [AFMUG] Stopping tower rust > > > > Brown rust. You can cause it with muriatic acid, but when I have tried to > do it in the past, my outcome was not uniform. Maybe it would have been OK > with some weathering but it was not aesthetically pleasing initially. > > > > *From:* Bill Prince > > *Sent:* Thursday, November 5, 2020 9:20 AM > > *To:* [email protected] > > *Subject:* Re: [AFMUG] Stopping tower rust > > > > There is also COR-TEN steel, which develops a special protective layer of > rust. > > https://www.corten.com/what-is-corten-steel.html > > bp > > <part15sbs{at}gmail{dot}com> > > On 11/5/2020 8:04 AM, [email protected] wrote: > > There are multiple kinds of rust. Some power transmission line towers are > rusty on purpose. > > > > Red Rust Hydrated oxide Fe2O3•H2O > > Yellow Rust Iron oxide-hydroxide FeO(OH)H2O > > Brown Rust Oxide Fe2O3 (high oxygen/low moisture) > > Black Rust Iron (II)oxide – Fe3O4 (limited oxygen) > > > > I think I have the order right. Red rust can eat clear through the > metal. It produces deep flakes of cancer in the thickest of steel. If you > can get the rust to progress through to brow rust it is a permanent coating > that will not continue to deteriorate. Not sure how you make that happen. > If you take a stroll along the pedestrian walkway of the Golden Gate > bridge, you will see 1/2” thick parts of the handrail that have flaked > completely through. And that is with regular scaling and painting. > > > > You can go look at an old piece of farm machinery in a field and the steel > is really good looking. Dark brown and black rust. > > > > > > From: Lewis Bergman > > Sent: Thursday, November 5, 2020 6:51 AM > > To: AnimalFarm Microwave Users Group > > Subject: Re: [AFMUG] Stopping tower rust > > > > Surface rust is of absolutely no consequence. I have black iron towers > that were constructed 40 years ago that have substantial surface rust. > While not pretty, it is structurally insignificant. If it looks more like > discoloring than rust, which if the galv is good is what it usually looks > like, I would do nothing. Anything you do to fix it will likely speed the > rusting process up. For instance, you could use naval jelly, which would > remove all the rust. If it is galv and not SS, the acid will eat more of > the galv coating off and it will rust faster from then on unless you paint > it. Then you are stuck painting a galv tower which is a PITA, expensive, > and will eventually look even worse. Paint, even when applied correctly > with the correct prep, just doesn't adhere to galv well. > > > > Sleep tight, don't worry, take the do nothing decision tree. > > > > On Thu, Nov 5, 2020 at 5:31 AM Matt Hoppes > mailto:[email protected] > <[email protected]> wrote: > > > > Could it be a zinc galvanized steel instead of stainless? I assumed > stainless due to the very limited rust. > > > > On Nov 5, 2020, at 6:27 AM, Matt Hoppes > mailto:[email protected] > <[email protected]> wrote: > > > > > > > > > > Ok. So then maybe it’s not an issue. It does just appear to be surface. > > > > On Nov 4, 2020, at 11:13 PM, Ken Hohhof mailto:[email protected] > <[email protected]> wrote: > > > > > > > > > > > > Apparently regular steel and stainless steel both “rust”. But stainless > forms a thin stable protective layer of chromium oxide, while regular steel > turns to unstable iron oxide which just grows and grows. > > > > > > > > https://www.scientificamerican.com/article/why-doesnt-stainless-stee/ > > > > > > > > > > > > > > > > From: AF mailto:[email protected] <[email protected]> On > Behalf Of [email protected] > > Sent: Wednesday, November 4, 2020 9:22 PM > > To: AnimalFarm Microwave Users Group mailto:[email protected] > <[email protected]> > > Subject: Re: [AFMUG] Stopping tower rust > > > > > > > > > > > > > > > > Certainly not stronger and twice the expense. > > > > > > > > > > > > > > > > From: Lewis Bergman > > > > > > > > Sent: Wednesday, November 4, 2020 8:07 PM > > > > > > > > To: AnimalFarm Microwave Users Group > > > > > > > > Subject: Re: [AFMUG] Stopping tower rust > > > > > > > > > > > > > > > > I would assume this wasn't a slip of the tongue. Just surprised that > anyone would build a tower out of stainless steel. Chuck would likely know > but I am pretty sure stainless is softer than regular steel. > > > > > > > > > > > > > > > > On Wed, Nov 4, 2020 at 8:24 AM Matt Hoppes > mailto:[email protected] > <[email protected]> wrote: > > > > > > > > We have a stainless steel tower that’s probably about 30 years old. Good > shape. But I noticed some minor rust developing on the surface of some > cross members and a few climbing pegs. > > > > What’s the best way to stop this and protect the tower? > > -- > > AF mailing list > > [email protected] > > http://af.afmug.com/mailman/listinfo/af_af.afmug.com > > > > > > > > > > > > > > > > > > > > > > > > -- > > > > > > > > Lewis Bergman > > > > > > > > 325-439-0533 Cell > > > > > > > > -- > > AF mailing list > > [email protected] > > http://af.afmug.com/mailman/listinfo/af_af.afmug.com > > > > -- > > AF mailing list > > [email protected] > > http://af.afmug.com/mailman/listinfo/af_af.afmug.com > > > > > > -- > > AF mailing list > > [email protected] > > http://af.afmug.com/mailman/listinfo/af_af.afmug.com > > > > > > > > -- > > > > Lewis Bergman > > 325-439-0533 Cell > > > > -- > > AF mailing list > > [email protected] > > http://af.afmug.com/mailman/listinfo/af_af.afmug.com > > > > ------------------------------ > > -- > AF mailing list > [email protected] > http://af.afmug.com/mailman/listinfo/af_af.afmug.com > -- > AF mailing list > [email protected] > http://af.afmug.com/mailman/listinfo/af_af.afmug.com >
-- AF mailing list [email protected] http://af.afmug.com/mailman/listinfo/af_af.afmug.com
