[ARC5] ARC5 Digest, Vol 212, Issue 16

[jbrannig]

I have used Rust Restorer on outdoor furniture with great results.JimSent from my Galaxy Tab® A
-------- Original message --------From: arc5-request at mailman.qth.net Date: 9/15/21  10:53 AM  (GMT-05:00) To: arc5 at mailman.qth.net Subject: ARC5 Digest, Vol 212, Issue 16 Send ARC5 mailing list submissions to	arc5 at mailman.qth.netTo subscribe or unsubscribe via the World Wide Web, visit	http://mailman.qth.net/mailman/listinfo/arc5or, via email, send a message with subject or body 'help' to	arc5-request at mailman.qth.netYou can reach the person managing the list at	arc5-owner at mailman.qth.netWhen replying, please edit your Subject line so it is more specificthan "Re: Contents of ARC5 digest..."Today's Topics:   1. Re: restoring rusty metal tubes (Dennis Monticelli)----------------------------------------------------------------------Message: 1Date: Wed, 15 Sep 2021 07:52:26 -0700From: Dennis Monticelli <dennis.monticelli at gmail.com>To: Brian Clarke <brianclarke01 at optusnet.com.au>Cc: Leslie Smith <lnsmith99 at gmail.com>, ARC-5 Maillist	<arc5 at mailman.qth.net>Subject: Re: [ARC5] restoring rusty metal tubesMessage-ID:	<CADgAsSSbyScXdbVcyGZUhtgAripoP_OLJ0R+-5gfkRxJrx5wqA at mail.gmail.com>Content-Type: text/plain; charset="utf-8"There is a product made by Restoleum that is called Rust Restorer.https://www.rustoleum.com/product-catalog/consumer-brands/auto/removers-and-chemicals/rust-reformer-spray/https://www.rustoleum.com/MSDS/ENGLISH/248658.pdfIt chemically converts the rust to another more stable molecule and leavesthe surface flat black.  Super easy to use.  I usually just spray a littleon a paper towel and wipe it on.  The color changes immediately.  You canpaint over it if you wish.  I use it a lot on transformers and chokes toimprove appearance.  I recommend some steel wool to first take off theloose rust and reduce the surface roughness.  I'm not certain but I thinkit can take the heat.  Seems fine on my transformers.Dennis AE6COn Wed, Sep 15, 2021 at 7:10 AM Brian Clarke <brianclarke01 at optusnet.com.au>wrote:> Hello Leslie,>>>> The external envelope of the metal tube can reach 270?C. Ordinary gloss> enamel will blister and peel off. Any rust removal product that uses> phosphoric acid will form a coating of iron phosphate ? good for preventing> further corrosion. But, it does reduce the thickness of the metal tubing.> No pot of phosphoric acid I have used has mentioned survival at 270?C.>>>> My suggestion, echoing but also eschewing advice from some of our> erstwhile US cousins is:>> 1.       Test the tubes for heater continuity, emission, gain and gas.> Manufacturers usually understate the specifications so that published> figures are often less than you achieve with a NIOB tube; a new tube should> be at least 25% better than spec. So, any tube that is not close to spec> becomes a good candidate for small-arms target practice.>> 2.       Mark (scratch, engrave) the phenolic base indelibly with the> type nomenclature. Scratching the nomenclature into the metal tube is a> sure way to start later corrosion. Probably not a good idea to engrave the> end of the octal key, because that part often gets broken off.>> 3.       Gently remove the rust by abrading with green Nylon mesh pot> cleaner. Leave the old paint in place wherever you can. A wire buff will> remove some of the metal ? where the metal is thinner it will get hotter.>> 4.       Apply a metal primer that will withstand 270?C, eg, a paint> designed for baking.>> 5.       Spray on an auto engine exhaust black paint formulation that> will finish matt ? most auto parts shops carry it. A gloss finish will not> radiate heat as well as a ?black body?.>> 6.       If you are a dab hand at calligraphy, rewrite the nomenclature> over the black matt with a high temperature white paint. Artist?s acrylic> probably won?t cut it. I got some high temperature white matt from an auto> parts store for redoing a toaster. Spray the paint into a small pot and> scribe with a fine artist?s brush or a tooth pick ? prefer the brush> because it holds more paint; the tooth pick may give a blobby result.>>>> Cheers, Brian, VK2GCE>>>> *From:* arc5-bounces at mailman.qth.net [mailto:arc5-bounces at mailman.qth.net]> *On Behalf Of *Leslie Smith> *Sent:* Wednesday, 15 September 2021 9:14 PM> *To:* arc5 at mailman.qth.net> *Subject:* [ARC5] restoring rusty metal tubes>>>> Hello all!>> I bought a box full of metal tubes recently.  12A6, 12K8, 12SK7 and so> on.  Many have an unattractive amount of rust on the surface, some have a> small amount.  None belong to a class I would call 'collectable'.>> Can anyone advise what I can do to preserve these?  My thoughts are along> the lines of clean the metal case with a buffing wheel; after that re-paint> with gloss spray.  All observations welcome.  I would like to save a box of> common, not too flash, but probably quite functional metal octal tubes.>> 73s from Australia.>> Leslie> ______________________________________________________________> ARC5 mailing list> Home: http://mailman.qth.net/mailman/listinfo/arc5> Help: http://mailman.qth.net/mmfaq.htm> Post: mailto:ARC5 at mailman.qth.net>> This list hosted by: http://www.qsl.net> Please help support this email list: https://www.qsl.net/donate.html-------------- next part --------------An HTML attachment was scrubbed...URL: <http://mailman.qth.net/pipermail/arc5/attachments/20210915/1bf3d7f2/attachment.html>------------------------------_______________________________________________ARC5 mailing listARC5 at mailman.qth.nethttp://mailman.qth.net/mailman/listinfo/arc5End of ARC5 Digest, Vol 212, Issue 16*************************************
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