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white residue on solder

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icubob(at)gmail.com
Guest

Posted: Fri Mar 16, 2012 3:53 pm Post subject: white residue on solder

hi all,

 i made a brass float for my fuel level indicator using solder. one area soldered has a white residue [maybe from resin] after being submerged in av gas 6 months. not all soldered areas have it. i could have easily used 2 different solders. i want to get into a small area on the float and make a repair. anyone know a solvent, liquid that would remove the chalky residue? it is a very thin layer and no threat to my fuel system but i want to get a clean area for a good bond.

  thanks, bob noffs

  [quote][b]

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nuckolls.bob(at)aeroelect
Guest

Posted: Fri Mar 16, 2012 6:14 pm Post subject: white residue on solder

At 06:52 PM 3/16/2012, you wrote:

 	  Quote: 	
		  hi all,

  i made a brass float for my fuel level indicator using solder. one 

 area soldered has a white residue [maybe from resin] after being 

 submerged in av gas 6 months. not all soldered areas have it. i 

 could have easily used 2 different solders. i want to get into a 

 small area on the float and make a repair. anyone know a solvent, 

 liquid that would remove the chalky residue? it is a very thin 

 layer and no threat to my fuel system but i want to get a clean 

 area for a good bond.

  thanks, bob noffs


	




   Without knowing more about the chemistry, its a toss

   up for being water soluble . . . or needs something

   else. You can't hurt the brass. Try water/solvent/acetone

   . . . or if push comes to shove, polish the brass with

   fine steel wool.

   Bob . . .

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skywagon

Joined: 11 Feb 2006
Posts: 184

Posted: Fri Mar 16, 2012 10:04 pm Post subject: white residue on solder

..use a little rubbing compound or similar and scrub with  a toothbrush or similar.  The brass has to brightened anyway to do a good  solder touch up....

 D

  

  

 [quote]   ---

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icubob(at)gmail.com
Guest

Posted: Tue Mar 20, 2012 3:38 am Post subject: white residue on solder

the residue came off with carb cleaner, [like you soak a carb in] and lacquer thinner. between the two it came off clean.

 bob noffs

On Sat, Mar 17, 2012 at 1:02 AM, David Lloyd <skywagon(at)charter.net (skywagon(at)charter.net)> wrote:

 [quote]       ..use a little rubbing compound or similar and scrub with  a toothbrush or similar.  The brass has to brightened anyway to do a good  solder touch up....

 D

  

  

 [quote]   ---

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