Circuit board manufacturing method without tin plating, tin retreating and capable of saving copper and nickle

Abstract

A method for manufacturing circuit board which is free of tin plating and tin removing and can save the using amounts of copper and nickel comprises the following steps: a. coating plating-resistant covering film on the circuit board after copper deposition or the first time of copper plating, then adhibiting the positive film of all metal holes and hole rings in the circuit pattern on the covering film for forming a primary circuit after exposing and developing; b. electroplating copper and nickel on the hole wall and hole ring of all metal holes, then removing the covering film; c. coating etching-resistant covering film on the circuit board after film removing, adhibiting the negative film of circuit pattern on the etching-resistant covering film, and forming the secondary circuit after exposing and developing; d. etching the circuit pattern, then removing film and checking erosion; and e. forming the finished product of circuit board through executing the steps of resistance welding, exposing, developing, printing component symbol or tin spraying or executing oxidation prevention procession. The method of the invention can reduce environment pollution and realize clean production through eliminating electrotinning and tin removing technique, effectively saves metal, water, electricity and chemical material and reduces production cost of enterprise through selectively electroplating copper and nickel.

Description

【Technical field】 [0001] The present invention relates to a printed circuit board (PCB), in particular to a process that eliminates tin plating and stripping tin, and greatly reduces the area of ​​copper and nickel to be plated by about 90%, thus effectively saving tin, nickel, copper and other precious metals The amount of circuit board production method. 【Background technique】 [0002] As we all know, printed circuit boards (PCBs) are widely used as the basic material of the electronics industry. As small as electronic watches, calculators, personal computers, as large as computers, communication equipment, medical equipment, and aerospace or military equipment, as long as there are electronic components such as integrated circuits, PCBs are used for electrical interconnection between them. Printed circuit boards are formed by setting conductive patterns for electrical connections between electronic components on an insulating substrate, and its manufacturing process is r...

AI Technical Summary

Problems solved by technology

It can be seen that the traditional process not only causes serious environmental pollution, but also causes a lot of waste of precious metals, water, electricity, and chemical materials, which greatly increases the production cost of enterprises.

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