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Alodine spar

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occom

Joined: 26 Aug 2006
Posts: 404

Posted: Tue Oct 03, 2006 7:49 am Post subject: Alodine spar

I am looking at corrosion resistance on My new spars. I have some alodine 

from the local auto parts store. Clearly the instructions assume I will 

simply slosh some of this back and forth inside the tube. Other instructions 

I have read about alodine seem to want some fairly aggressive scrubbing 

first. How have you done it? Thanks.

Guy Buchanan

Joined: 16 Jul 2006
Posts: 1204
Location: Ramona, CA

Posted: Tue Oct 03, 2006 1:56 pm Post subject: Alodine spar

At 08:49 AM 10/3/2006, you wrote:

 	  Quote: 	
		  Clearly the instructions assume I will

simply slosh some of this back and forth inside the tube. Other instructions

I have read about alodine seem to want some fairly aggressive scrubbing

first. How have you done it?


	


I always use Metl-Prep before Alodine. It's available at ACS and it 

chemically etches the aluminum.

Guy Buchanan

K-IV 1200 / 582-C / Warp / 100% done, thanks mostly to Bob Ducar.

_________________
Guy Buchanan
Deceased K-IV 1200
A glider pilot too.

janderson412(at)hotmail.c
Guest

Posted: Tue Oct 03, 2006 2:20 pm Post subject: Alodine spar

You need to slightly scuff the surface first. I used a wod of scotch bright 

and dragged it back and forth with a light rope, then plug one end and slosh 

out with the alodine.

From: "Dave G." <occom(at)ns.sympatico.ca>

Reply-To: kitfox-list(at)matronics.com

To: <kitfox-list(at)matronics.com>

Subject: Alodine spar

Date: Tue, 3 Oct 2006 12:49:10 -0300






I am looking at corrosion resistance on My new spars. I have some alodine 

from the local auto parts store. Clearly the instructions assume I will 

simply slosh some of this back and forth inside the tube. Other instructions 

I have read about alodine seem to want some fairly aggressive scrubbing 

first. How have you done it? Thanks.



_________________________________________________________________

Discover fun and games at  (at)  http://xtramsn.co.nz/kids

shilocom(at)mcmsys.com
Guest

Posted: Wed Oct 04, 2006 3:24 am Post subject: Alodine spar

Alodine is a Chemical etch and only requires contact and time to get the job

done.  That being said, I know others believe it is a "corrosion inhibitor",

I believe that is wishful thinking.  None of the tech sheets make any such

claims that I've seen.  It is simply an etch for improved paint adhesion and

not much more if anything.  Dupont recommends the acid wash first then the

alodine.  Alodine has been on there long enough and your acid prep was good

enough when it turns the metal a dark yellow.   Self etching epoxy primers

do the same thing in one step.  That's what I use now.  Bob U.

---

Float Flyr

Joined: 19 Jul 2006
Posts: 2704
Location: Campbellton, Newfoundland

Posted: Wed Oct 04, 2006 5:57 am Post subject: Alodine spar

Scrub and Alumiprep first until water will sheet off the part. (water brake

test) rinse and immediately alodine.  In a nutshell that's how I did it.



Noel



[quote] --

_________________
Noel Loveys
Kitfox III-A
Aerocet 1100 Floats

occom

Joined: 26 Aug 2006
Posts: 404

Posted: Wed Oct 04, 2006 8:02 am Post subject: Alodine spar

---

janderson412(at)hotmail.c
Guest

Posted: Wed Oct 04, 2006 2:17 pm Post subject: Alodine spar

I am told by one of our aviation technical staff that in laymen’s terms it's 

a neutralizing coating, sort of satisfies the surface neutrons desire to 

look for another (oxidizing) brother neutron. "Corrosion inhibitor", well 

it’s debatable, again he said if undisturbed, yes. Look at the many alloy 

alodined components that are stored for years before use with no corrosion 

showing, but one small scratch and it will corrode . The paint over top of 

raw aluminum alloy is not a corrosion inhibitor, it’s just a coating, (some 

etch coatings may be) but by alodining the combination will offer more 

pertinent protection.





From:  "Bob Unternaehrer" <shilocom(at)mcmsys.com>

Reply-To:  kitfox-list(at)matronics.com

To:  <kitfox-list(at)matronics.com>

Subject:  Re: Alodine spar

Date:  Wed, 4 Oct 2006 06:33:37 -0500




Alodine is a Chemical etch and only requires contact and time to get the job

done.  That being said, I know others believe it is a "corrosion inhibitor",

I believe that is wishful thinking.  None of the tech sheets make any such

claims that I've seen.  It is simply an etch for improved paint adhesion and

not much more if anything.  Dupont recommends the acid wash first then the

alodine.  Alodine has been on there long enough and your acid prep was good

enough when it turns the metal a dark yellow.   Self etching epoxy primers

do the same thing in one step.  That's what I use now.  Bob U.

---

janderson412(at)hotmail.c
Guest

Posted: Wed Oct 04, 2006 2:35 pm Post subject: Alodine spar

Sorry, I meant permanent protection....



I am told by one of our aviation technical staff that in laymen’s terms it's 

a neutralizing coating, sort of satisfies the surface neutrons desire to 

look for another (oxidizing) brother neutron. "Corrosion inhibitor", well 

it’s debatable, again he said if undisturbed, yes. Look at the many alloy 

alodined components that are stored for years before use with no corrosion 

showing, but one small scratch and it will corrode . The paint over top of 

raw aluminum alloy is not a corrosion inhibitor, it’s just a coating, (some 

etch coatings may be) but by alodining the combination will offer more 

permanent protection.





From:  "Bob Unternaehrer" <shilocom(at)mcmsys.com>

Reply-To:  kitfox-list(at)matronics.com

To:  <kitfox-list(at)matronics.com>

Subject:  Re: Alodine spar

Date:  Wed, 4 Oct 2006 06:33:37 -0500




Alodine is a Chemical etch and only requires contact and time to get the job

done.  That being said, I know others believe it is a "corrosion inhibitor",

I believe that is wishful thinking.  None of the tech sheets make any such

claims that I've seen.  It is simply an etch for improved paint adhesion and

not much more if anything.  Dupont recommends the acid wash first then the

alodine.  Alodine has been on there long enough and your acid prep was good

enough when it turns the metal a dark yellow.   Self etching epoxy primers

do the same thing in one step.  That's what I use now.  Bob U.

---

occom

Joined: 26 Aug 2006
Posts: 404

Posted: Sat Oct 07, 2006 9:50 am Post subject: Alodine spar

 	  Quote: 	
		  > 

> <shilocom(at)mcmsys.com>

>

> Alodine is a Chemical etch and only requires contact and time to get the 

> job

> done.  That being said, I know others believe it is a "corrosion 

> inhibitor",

> I believe that is wishful thinking.  None of the tech sheets make any 

> such

> claims that I've seen.  It is simply an etch for improved paint adhesion 

> and


	


Hi Bob and list. I picked up the product I bought and while I had asked for 

Alodine by name the product I received is Dupont 225S metal prep and Dupont 

226S Conversion Coating which does contain chromic acid  and is advised to 

give a high degree of corrosion resistance on aircraft etc. Says it 

stabilizes aluminum and give corrosion resistance and paint adhesion. It may 

be the same as Alodine as it says it imparts a "golden" colour. We'll see. I 

may ultimately wash the inside if the spars with zinc chromate or epoxy 

chromate but the original spars lived in our Maritime climate for 15 years 

and there is no sign of any corrosion on the pile of cut up spar.

janderson412(at)hotmail.c
Guest

Posted: Sat Oct 07, 2006 12:30 pm Post subject: Alodine spar

Sounds the same as Alodine if it contains chromic acid, and offers corrosion 

resistance but to just the surface layer. Do not scratch or scuff after 

treatment, just degrease.

From: "Dave G." <occom(at)ns.sympatico.ca>

Reply-To: kitfox-list(at)matronics.com

To: <kitfox-list(at)matronics.com>

Subject: Re: Alodine spar

Date: Sat, 7 Oct 2006 14:49:26 -0300






 	  Quote: 	
		  >

><shilocom(at)mcmsys.com>

>

>Alodine is a Chemical etch and only requires contact and time to get the 

>job

>done.  That being said, I know others believe it is a "corrosion 

>inhibitor",

>I believe that is wishful thinking.  None of the tech sheets make any such

>claims that I've seen.  It is simply an etch for improved paint adhesion 

>and


	


Hi Bob and list. I picked up the product I bought and while I had asked for 

Alodine by name the product I received is Dupont 225S metal prep and Dupont 

226S Conversion Coating which does contain chromic acid  and is advised to 

give a high degree of corrosion resistance on aircraft etc. Says it 

stabilizes aluminum and give corrosion resistance and paint adhesion. It may 

be the same as Alodine as it says it imparts a "golden" colour. We'll see. I 

may ultimately wash the inside if the spars with zinc chromate or epoxy 

chromate but the original spars lived in our Maritime climate for 15 years 

and there is no sign of any corrosion on the pile of cut up spar.



_________________________________________________________________

Discover fun and games at  (at)  http://xtramsn.co.nz/kids

Fox5flyer
Guest

Posted: Sun Oct 08, 2006 3:41 am Post subject: Alodine spar

I used Alodine on some aluminum parts, but wasn't impressed.  After a

year or so the paint began to peel off in places.  I cleaned and

scotch brighted according to directions.  I've had much better luck

with the old tried and tested zinc chromate, and better luck with

epoxy chromate.  A good cleaning and scotch brighting is necessary

prior to application.  I try to get it covered within 4 hours of

cleaning because aluminum oxidizes very quickly.

Deke

--

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