sanding pins on a USB Port ?

Discussion in 'General Electronics Chat' started by frank55, Jan 8, 2016.

  1. frank55

    Thread Starter Member

    Dec 6, 2013
    Hi guys,i've been wanting to ask you guys,
    Is it a good practice to sand pins on an electronic component before to add solder?
    i have here a USB port that has this tiny legs and i already lost one port and ordered another one .

    it seems to me the 5 pins are hard to solder to the board,it seems to me those pins are not made of good materials,should i sand them first ?
  2. mcgyvr

    AAC Fanatic!

    Oct 15, 2009
    I'll assume you are hand soldering them.. If so and flux cored solder isn't sufficient then get some extra flux and use that..
    I'd bet its just a lack of soldering skills...

    Unless your parts are so old and were stored in a horrible..horrible environment there is no way that any corrosion/oxidation is bad enough to require sanding.. and if it was there is no way I'd do anything but throw those parts in the trash.
  3. dl324

    Distinguished Member

    Mar 30, 2015
    No. Many leads are coated to protect the base material and/or improve solderability. If you remove the coating, you defeat the purpose.

    In general, flux is used to cut through any oxidation; but there are times when some judicious mechanical intervention is required.
  4. Kermit2

    AAC Fanatic!

    Feb 5, 2010
    Aged copper can form a hard smooth coating of oxidation that will prevent mild Flux from working and sometimes even make zinc chloride fail to work.
    In such EXTREME cases one can use a 320 or finer emery paper to gently brighten the area. I HAVE done this and it works.
  5. frank55

    Thread Starter Member

    Dec 6, 2013
    Thanks ; Kermit2 do you mean that the pins on this cheap USB port maybe made of zinc chloride?.
  6. GopherT

    AAC Fanatic!

    Nov 23, 2012

    No, chloride salts in the flux etch away the oxides of copper and tin as the solder flows onto the metal.

    If solder seems to bead up and not bond to the component leads or the circuit board (bare copper or tin-plated copper), then fine sand paper is one option but a pencil eraser also works (and you don't end up with black copper or tin dust everywhere). Any good quality pink or white eraser will work. Rub until the metal is bright. Takes just a few seconds, flip and do the other side.
  7. bertus


    Apr 5, 2008
  8. takao21203

    AAC Fanatic!

    Apr 28, 2012
  9. crutschow


    Mar 14, 2008
    I'd be surprised if an application of a small amount of rosin flux before soldering, doesn't cure your problem.
  10. frank55

    Thread Starter Member

    Dec 6, 2013
    Thanks guys i will try to do the job one more time.i think my issue is more of low vision, the pins are so tiny would be better off with a microscope, but it's too much money,this time i will use stronger glasses with my branch lens
  11. atferrari

    AAC Fanatic!

    Jan 6, 2004
    Fine steel wool works marvels also with tarnished PCBS. Clean well and start soldering.