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corrosion on pitch torque tube

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sarangan(at)udayton.edu
Guest

Posted: Mon Sep 05, 2011 4:56 pm Post subject: corrosion on pitch torque tube

I found my steel pitch tube (the one that goes on the back of the

cockpit module) has surface corrosion, mostly near the tab weld

joints. I suspect the plating must have been stripped off during the

welding process. The tube is dark brown, almost black, and I am unsure

if that means it is zinc plated or something else. I was thinking of

scrubbing the whole tube in alumiprep (dilute phosphoric acid) and

then painting with zinc chromate primer. I don't have any experience

working with this type of steel, and what effect if any phosphoric

acid has, so I would appreciate any input on this.

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fklein(at)orcasonline.com
Guest

Posted: Mon Sep 05, 2011 6:21 pm Post subject: corrosion on pitch torque tube

Andrew Sarangan wrote:



 	  Quote: 	
		   I found my steel pitch tube (the one that goes on the back of the

 cockpit module) has surface corrosion, mostly near the tab weld

 joints. I suspect the plating must have been stripped off during the

 welding process. The tube is dark brown, almost black, and I am unsure

 if that means it is zinc plated or something else. I was thinking of

 scrubbing the whole tube in alumiprep (dilute phosphoric acid) and

 then painting with zinc chromate primer. I don't have any experience

 working with this type of steel, and what effect if any phosphoric

 acid has, so I would appreciate any input on this.


	


Andrew,



In my case, all my steel components (Kit #A194) appeared to be raw w/  

a blackened finish...there were a few small areas of surface rust  

which I removed w/ fine wetsand paper and solvent...I had a shop  

powder coat the steel pieces and I sprayed zinc chromate primer on all  

aluminum pieces except for the landing gear.



Fred

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jan_de_jong(at)casema.nl
Guest

Posted: Tue Sep 06, 2011 12:03 am Post subject: corrosion on pitch torque tube

I use KBS 3-step system on all steel parts. Adheres amazingly.



Jan de Jong

 	  Quote: 	
		  

 I found my steel pitch tube (the one that goes on the back of the

 cockpit module) has surface corrosion, mostly near the tab weld

 joints. I suspect the plating must have been stripped off during the

 welding process. The tube is dark brown, almost black, and I am unsure

 if that means it is zinc plated or something else. I was thinking of

 scrubbing the whole tube in alumiprep (dilute phosphoric acid) and

 then painting with zinc chromate primer. I don't have any experience

 working with this type of steel, and what effect if any phosphoric

 acid has, so I would appreciate any input on this.

- The Matronics Europa-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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g-iani(at)ntlworld.com
Guest

Posted: Tue Sep 06, 2011 12:58 am Post subject: corrosion on pitch torque tube

Andrew



If your CS10 is dark brown/black then it will not have been plated.  The

steel components were shipped with this oil finish up to about 2002/3 when

Europa started plating them (the gold finish).



The oil finish will prevent some corrosion but a better solution is to clean

and paint the component.  As your end caps are already in place try and

ensure you do not get any acid cleaner inside the tube.  This will corrode

the MS21047 anchor nut and could make future removal difficult.  Almost any

paint system designed for steel will do.



Ian Rickard G-IANI XS Trigear, 350hours

Europa Club Mods Specialist

e-mail g-iani(at)ntlworld.com

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asarangan(at)gmail.com
Guest

Posted: Wed Sep 07, 2011 8:03 am Post subject: corrosion on pitch torque tube

I just received the mod 75 kit (autopilot altitude hold) which

included a new CS10 tube. This tube is indeed different from the one I

got back in 2000. It is a golden color, and the weld joint has been

spray coated with what looks like zinc chromate paint.



On Tue, Sep 6, 2011 at 4:55 AM, G-IANI <g-iani(at)ntlworld.com> wrote:

 	  Quote: 	
		   



 Andrew



 If your CS10 is dark brown/black then it will not have been plated.  The

 steel components were shipped with this oil finish up to about 2002/3 when

 Europa started plating them (the gold finish).



 The oil finish will prevent some corrosion but a better solution is to clean

 and paint the component.  As your end caps are already in place try and

 ensure you do not get any acid cleaner inside the tube.  This will corrode

 the MS21047 anchor nut and could make future removal difficult.  Almost any

 paint system designed for steel will do.



 Ian Rickard G-IANI XS Trigear, 350hours

 Europa Club Mods Specialist

 e-mail g-iani(at)ntlworld.com

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Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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