| https://www.eptac.com/faqs/soldertips/soldertip/soldertips-solderability-issues-with-nickle-plated-surfaces
problem with the adhesion of the final coating. You don’t mention what type of flux is being used, but this is one place where an aggressive flux can be used to remove the passivation from the nickel coating
ASCEN Technology | https://www.ascen.ltd/Blog/Solutio/598.html
simple solvent evaporation They have a wide operating temperature range. They have excellent adhesion to a wide variety of substrates
1 |