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dielectric grease

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icubob(at)newnorth.net
Guest

Posted: Sat Sep 27, 2008 4:07 am Post subject: dielectric grease

bob,

  do you recommend using dielectric grease on  any connections? where the copper terminates on steel? i thought i had been told  to use it between an alum and copper joint.

                                                                        bob noffs

    [quote][b]

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nuckolls.bob(at)cox.net
Guest

Posted: Sat Sep 27, 2008 5:38 am Post subject: dielectric grease

At 07:05 AM 9/27/2008 -0500, you wrote:

 	  Quote: 	
		  bob,

  do you recommend using dielectric grease on any connections? where the 

 copper terminates on steel? i thought i had been told to use it between 

 an alum and copper joint.

                                                                       bob 

 noffs


	




     Generally we don't put copper and steel right together.

     Terminals are plated with tin to provide a material in

     the "sandwich" that goes toward minimizing the effects

     of electrolytic corrosion.



     Keep in mind that this corrosion needs oxygen and moisture

     to move forward. Getting the joint gas-tight goes a long

     way toward holding corrosion at bay. However, this does not

     preclude prophylactic measures like silicone grease on

     the before-mating parts, or encapsulation by painting on

     some manner of sealant on the finished joint.



     I can tell you that paints, gunks and goos are very process

     sensitive on the production line and we work really hard

     to avoid using them. If you've got the right materials

     coming together under the right forces in the first place,

     the "extra protection" is not needed.



     Now, when you're wiring up a boat or other machine exposed

     to a humid, salt-air environment, you can't do too

     much to forestall future maintenance. But outside this

     environmental extreme, there's probably not much value

     to be realized with added grease in the joints. I've never

     seen it done on a production airplane.



     Bob . . .



        ----------------------------------------)

        ( . . .  a long habit of not thinking   )

        ( a thing wrong, gives it a superficial )

        ( appearance of being right . . .       )

        (                                       )

        (                  -Thomas Paine 1776-  )

        ----------------------------------------

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