Water Washing Technology of Printed Circuit Board

PCBA water cleaning process takes water as the cleaning medium. A small amount (generally 2% 10%) of surfactants, corrosion inhibitors and other chemical substances can be added to the water. Through washing, PCBA cleaning is completed by multiple source washing and drying with pure water or deionized water.

The advantage of water cleaning is that the cleaning medium of water cleaning is generally non-toxic, does not endanger the health of workers, and is non combustible and non explosive

Good safety. Water cleaning has a good cleaning effect on particles, rosin flux, water-soluble pollutants and polar pollutants: water cleaning has good compatibility with packaging materials and PCB materials of components, and does not swell and crack rubber parts and coatings, so that the marks and symbols on the surface of components can remain clear and complete and will not be washed away. Therefore, water cleaning is one of the main processes of non ODS cleaning.

The disadvantage of water washing is that the investment of the whole equipment is large, and it is also necessary to invest in water making equipment of pure water or deionized water. In addition, it is not applicable to non air tight devices, such as adjustable potentiometers, inductors, switches and other water vapor entering the device is not easy to discharge, and even damage the ring components.

Water washing technology can be divided into pure water washing and water plus surfactant. The typical PCBA process flow is as follows:

Water surface activity → water → pure water → ultrapure water → hot air

wash     Washing and rinsing    Rinse    dry

Generally, ultrasonic device is added in the washing stage, and air knife (nozzle) device is added in addition to ultrasonic in the cleaning stage. The water temperature shall be controlled at 60-70 ℃, the water quality shall be very high, and the resistivity shall be 8-18mq ・ cm. This alternative technology is applicable to enterprises with high requirements for large batch production and product reliability in SMT patch processing plant. For small batch cleaning, small cleaning equipment can be selected.

Water Washing Technology of Printed Circuit Board 1

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