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rowlandcarson(at)gmail.co
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 Posted: Thu Aug 21, 2014 3:46 am Post subject: anti-corrosion coating of tailwheel spring arm |
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After a recent presentation at the Gloster Strut where the aircraft on display had all its steel parts electro-phoretic coated, I made enquiries at the firm the builder had used about anti-corrosion treatment on my tailwheel spring arm. The guy I talked to advised that the EP coating is a bit like an epoxy paint, and could start to go “chalky” after a few years. But as I’d be liable for the minimum charge anyway, he suggested I have instead a much more effective treatment which is a type of zinc plating and results in a greenish finish that can be sprayed over for cosmetic appearance. However, that process involves an acid bath and could lead to hydrogen embrittlement if the arm is high-tensile steel. He said it should be OK if the steel was not high-tensile - above about 60 ton or 1040 Newtons.
Does anyone know the specification of the steel used for the tailwheel arm?
Or - has anyone a better suggestion for corrosion protection?
in friendship
Rowland
| Rowland Carson ... that's Rowland with a 'w' ...
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davidjoyce(at)doctors.org
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| Posted: Thu Aug 21, 2014 9:23 am Post subject: anti-corrosion coating of tailwheel spring arm |
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Rowland, I suspect it is high tensile steel, but do not
know. My tail spring has lasted for 14 yrs without any
sign of significant corrosion ( & it has flown through
plenty of rain!) with just two pot paint on top of (I
think) acid etch primer. Could get more precise info from
Roger Targett if you like. Regards, David
On Thu, 21 Aug 2014 12:45:30 +0100
Rowland Carson <rowlandcarson(at)gmail.com> wrote:
| Quote: |
<rowlandcarson(at)gmail.com>
After a recent presentation at the Gloster Strut where
the aircraft on display had all its steel parts
electro-phoretic coated, I made enquiries at the firm the
builder had used about anti-corrosion treatment on my
tailwheel spring arm. The guy I talked to advised that
the EP coating is a bit like an epoxy paint, and could
start to go “chalky” after a few years. But as I’d be
liable for the minimum charge anyway, he suggested I have
instead a much more effective treatment which is a type
of zinc plating and results in a greenish finish that can
be sprayed over for cosmetic appearance. However, that
process involves an acid bath and could lead to hydrogen
embrittlement if the arm is high-tensile steel. He said
it should be OK if the steel was not high-tensile - above
about 60 ton or 1040 Newtons.
Does anyone know the specification of the steel used for
the tailwheel arm?
Or - has anyone a better suggestion for corrosion
protection?
in friendship
Rowland
| Rowland Carson ... that's Rowland with a 'w'
...
| <rowlandcarson(at)gmail.com>
http://www.rowlandcarson.org.uk
| Skype, Twitter: rowland_carson Facebook: Rowland
Carson
| pictures: http://picasaweb.google.com/rowlandcarson
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Bill & Sue
Joined: 10 Jan 2006
Posts: 48
Location: Malvern, Worcs. UK (Defford, Croft Farm)
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| Posted: Fri Aug 22, 2014 1:00 am Post subject: Re: anti-corrosion coating of tailwheel spring arm |
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Rowland,
We had all our metalwork plated/anodised by a firm in Portsmouth who were excellent but it was many years ago and there was a (reasonable) minimum charge. I suspect the trigear legs are similar to the tail spring, on the advice of the factory and others who know better than I we left the legs alone because of the (possible) issues of embrittlement. I strongly suspect you would get a perfectly satisfactory indistinguishable result and sleep easier at night if you just paint them.
Regards
Bill
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grahamsingleton(at)btinte
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| Posted: Fri Aug 22, 2014 1:14 am Post subject: anti-corrosion coating of tailwheel spring arm |
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Better still, just coat them with ACF50.
Graham
From: "Bill & Sue" <Billandsue(at)billbell.co.uk>
To: europa-list(at)matronics.com
Sent: Friday, 22 August 2014, 10:00
Subject: Re: anti-corrosion coating of tailwheel spring arm
--> Europa-List message posted by: "Bill & Sue" <Billandsue(at)billbell.co.uk (Billandsue(at)billbell.co.uk)>
Rowland,
We had all our metalwork plated/anodised by a firm in Portsmouth who were excellent but it was many years ago and there was a (reasonable) minimum charge. I suspect the trigear legs are similar to the tail spring, on the advice of the factory and others who know better than I we left the legs alone because of the (possible) issues of embrittlement. I strongly suspect you would get a perfectly satisfactory indistinguishable result and sleep easier at night if you just paint them.
Regards
Bill
Read this topic online here:
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Paul M 383
Joined: 19 Mar 2012
Posts: 102
Location: United Kingdom
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| Posted: Tue Feb 24, 2015 8:31 am Post subject: Re: anti-corrosion coating of tailwheel spring arm |
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Hello Rowland,
Quite probably way past its sell-by date but, according to Karen at Europa, the TW spring is SAE 6150 steel alloy, hardened & tempered to Rockwell C42-44. Later ones also come zinc chromate primed, so the implication is to paint it.
I would prefer to leave mine bare metal in colour to match the main gear leg, so I enquired about plating with a specialist (Precision Aircraft in Reading) and they advised:
"I have attached a photo of a cad finish so you can see what colour your part would look like when plated, cadmium is a white colour but is dipped in the olive drab passivation solution after plating and de-embrittlement. Your part would require stress relieving prior to cadmium plating 190-230°C for a minimum of 4 hours. After plating your part would require de-embrittlement which would be the same times and temperature as the stress relieve."
I don't much care for the resulting colour, so I may be forced to paint mine white - it is far enough away from the main leg not to jar on the eye and Dave J's doesn't look too bad after 14 years...
NB the attached picture is NOT what a TW spring looks like after cad plating!
HTH
Paul M
383 XS Mono 912s
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rowlandcarson(at)gmail.co
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| Posted: Tue Feb 24, 2015 12:03 pm Post subject: anti-corrosion coating of tailwheel spring arm |
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On 24 Feb 2015, at 16:31, Europaul383 <europaul383(at)hotmail.com> wrote:
| Quote: | Quite probably way past its sell-by date but, according to Karen at Europa, the TW spring is SAE 6150 steel alloy, hardened & tempered to Rockwell C42-44. Later ones also come zinc chromate primed, so the implication is to paint it.
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Paul - I also decided to paint it - etch-primer + Halfords Appliance Gloss White. It’s not quite as robust as plating or other chemical treatments, but it’s cheap and simple!
in friendship
Rowland
| Rowland Carson ... that's Rowland with a 'w' ...
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tennant
Joined: 19 Apr 2011
Posts: 121
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| Posted: Wed Feb 25, 2015 9:54 am Post subject: Re: anti-corrosion coating of tailwheel spring arm |
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Rowland,
2 coats of Hammerite - 17 years ago and the TW spring still looks OK!
Whatever you use must be quite flexible to resist those one in 20 "not so perfect" landings!!
Barry
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Barry Tennant
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budyerly(at)msn.com
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| Posted: Wed Feb 25, 2015 6:26 pm Post subject: anti-corrosion coating of tailwheel spring arm |
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We use Rustoleum Hammerite spray on many things in the shop. It looks OK and it is easy to touch up. It is great for fiberglass components as it covers small imperfections well. It doesn't hold up to heat well, but has been used on the ducting in the cowl.
We have not used it on metal control brackets or rods as I like a smooth finish to identify corrosion bubbles hidden under the paint.
It has earned our "dammed adequate" recommendation.
Bud
Sent from my Verizon Wireless 4G LTE DROID
On Feb 25, 2015 12:59 PM, tennant <barrington.tennant(at)gmail.com> wrote:
--> Europa-List message posted by: "tennant" <barrington.tennant(at)gmail.com>
Rowland,
2 coats of Hammerite - 17 years ago and the TW spring still looks OK!
Whatever you use must be quite flexible to resist those one in 20 "not so perfect" landings!!
Barry
--------
Barry Tennant
D-EHBT
At EDLM - Germany
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