How can tin plated copper wire be checked for tin plating quality?
Check the solder with nickel plated steel sheet and solder it.
Appearance, visual observation or magnifying glass observation, the wire surface is bright and clean, without black spots, spots, burrs, tin particles, yellow, cracks, copper leakage and so on. 2, aging resistance, drying the product in 200 + 5 degrees, bake an hour out, not yellow, black, blue observation. 3, solderability, wetting degree or by hot dip tin test to do, try to reach more than 95% pieces of immersion part for qualified tin dipping 3S after the cover area; combined with the continuity and the 4, coating by sodium polysulfide test for three cycles, the same black, gray, allow, plating no cracking; 5, the thickness of the coating by weighing method or chemical stripping method test, the general requirements in 3-7um
In the dilute hydrochloric acid or dilute sulfuric acid in full response, and then copper wire out of drying, copper wire quality reduction is tin quality.
