Electronic Component Talk

Smd Green
PCBs are green, why?

Many professionals and double-sided PCBs, SMD Board .... I mean, it's a green substance created by a single-sided antioxidant Or what happened? And all their spray etchant What is it? I could use? ferric chloride used instead?

If you see the green "solder mask". Solder It is a mask - there at the top of the board flows freely from the substrate To prevent the solder is coated on the bottom. This is most Circuit Board to provide the green color. That green color pewter such as Green & Black mask.They can use different colors are known. The purpose of corrosion protection and good insulation layer Cut To provide. The most important thing - the solder mask (the name Suggests) in the adjacent traces, and bridge pins to prevent solder Can. All circuit boards, solder mask, but it has. Many do not have power, while a cheap board, spray etching Use. You RoHS Directive - European Union Directive 2002/95/EC is based on. In most cases, etchant of nitric acid, Ferric Chloride, or will Persulfate (Ferric Chloride above) is popular. These two liquids (premixed), and powder Form, ie, the powder is generally quite affordable, available Care when needed, but mixed. In addition, however, etching proceeds (1) with a warm etchant, and (2) mixing is faster.

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