Method for treating drilling dirt on hole wall of printed board

Abstract

The invention discloses a method for treating drilling dirt on the hole wall of a printed board. The method comprises the following steps that S1, cleaning liquid is put into a cleaning tank, and the cleaning liquid comprises ammonium ions, hydrogen ions and fluorine ions; S2, ultrasonic vibration rods are installed at the diagonal positions of the cleaning tank correspondingly, and the ultrasonic vibration rods are connected with an ultrasonic generator; S3, the printed board to be cleaned is put into the cleaning tank; S4, the ultrasonic generator is started, and the printed board is cleaned in the cleaning tank for 2 minutes-3 minutes; and S5, the cleaned printed board is taken out, and drying treatment is conducted on the printed board. According to the method, residual concentrated sulfuric acid in a hole can be rapidly removed by utilizing an ultrasonic vibration cleaning treatment method, the hole wall is prevented from being secondarily polluted by drilling dirt dissolved in the residual concentrated sulfuric acid, and meanwhile, a uniform and consistent concave corrosion effect can be formed.

Description

technical field [0001] The invention belongs to the technical field of cleaning printed boards, and in particular relates to a method for treating drilling dirt on hole walls of printed boards. Background technique [0002] Printed board, also known as printed circuit board, or PCB for short, is one of the important components of the electronics industry, a support for electronic components, and a carrier for electrical connections. Almost all electronic devices use printed boards, and irreplaceability is one of the important factors for the long-term and stable development of the printed board industry. Removing drilling smear on the hole wall is an essential process in the production of printed boards. At present, the commonly used chemical solutions for removing drilling smear on the hole wall in the field of printed board production include concentrated sulfuric acid system, alkaline potassium permanganate system and chromic acid system. When the concentrated sulfuric ...

AI Technical Summary

Problems solved by technology

At present, the effect of commonly used water cleaning treatment is not ideal. The residual concentrated sulfuric acid in the hole cannot be quickly and effectively removed during the cleaning process. The residual concentrated sulfuric acid in the interior will continue to corrode the hole wall, which will cause uneven hole wall corrosion, which will affect the electrical performance of the printed board and the reliability of the printed board in severe cases.