Manufacturing method of circuit board with selectively plated copper and tin

Abstract

The invention relates to a manufacturing method of a circuit board with selectively plated copper and tin, comprising the following steps: coating a plating-resistant cover film on a copper precipitation circuit board or a circuit board plated with copper at first time, and then bonding positive sheets of all metal holes and hole rings, which are contained in circuit diagrams, on the plating-resistant cover film to form a primary circuit after exposure and development; plating copper and tin on the hole walls of all the metal holes and the hole rings and then carrying out film de-coating; coating a corrosion-resistant cover film on the de-coated circuit board, and then bonding negative sheets of the circuit diagrams on the corrosion-resistant cover film to form a secondary circuit after exposure and development; etching the circuit diagrams and then carrying out film de-coating and tin de-coating; and manufacturing a circuit board product after welding prevention, exposure, development, element mark printing, tin spraying, anti-oxidation process or turmeric and outline process. The invention selectively plates copper and tin, thereby greatly reducing the amount of copper and tin to greatly reduce the environmental pollution from tin de-coating process, effectively saving the copper, tin, water, electricity, chemical materials, energy charges and manpower and effectively reducing the production costs for enterprises.

Description

【Technical field】 [0001] The present invention relates to a printed circuit board (PCB), particularly relates to a kind of electroplating and stripping tin selectively on the printed circuit board, which can greatly reduce the plated area of ​​copper and tin to about 90%, thus effectively saving copper, A method for making a circuit board with the amount of precious metals such as tin. 【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 ...

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.

Images