Lowering Nitrogen Levels to burn off flux residue| 11 August, 2000
I am currently building boards which have to be conformal coated (done by an outside source) in a no clean process. The conformal coating however, must be applied to a clean surface. The flux residue left from the paste has come into question. I have been adviced to reduce the Nitrogen content during reflow. It will supposedly aid in burning off more flux during reflow. However, to my knowledge, the addition of Nitrogen is supposed to aid in less flux residue. So which is it?