Rinsing Fundamentals

Rinsing is a crucial component of a surface finishing process. Without a rinse between stages, incompatible chemicals may mix, causing contamination and other hazards.

The main purpose of rinsing between chemical processes is to protect from contamination. For example, alkaline cleaners must be thoroughly rinsed before entering acid activation. This will ensure that no solids are formed,

Rinsing may also be used prior to drying as the final step in removing chemical residues prior to drying. Final rinses, typically high in temperature aid in drying, eliminate the concentration of residual salts improving corrosion protection.

There’s a balance to rinsing – using enough water without using too much. The impact of rinse water usage includes water costs, waste treatment costs, and process integrity. Consider many factors when determining flow rates of rinses to ensure process integrity and minimize the costs associated with rinsing. Keep your operations pristine with these protocols for good rinsing.

Good Rinsing Protocols

• Start with the appropriate tank size. The tank should only be large enough to process the size of the largest part. Over-sized tanks require more water, energy, and time.

• Water should be introduced to the tank near the bottom.

• Weirs can be used to skim off debris, contaminants, and oil. They

• Agitation by air, educators, or pumps will help contaminants from stratifying at the bottom of the tank.

Reduce Water Usage

Counterflow rinsing is a good way to reduce water usage and improve the integrity of the entire process. However, counterflow rinsing has drawbacks including additional equipment costs, floor space, and process steps.

Rinsing processes can also be improved using dragout rinse tanks. Dragout can reduce rinse water usage by eliminating contaminants being introduced into the rinse.

KEY INSIGHT: A dragout tank is a non-flowing rinse tank that is used to capture chemicals that stick to workpieces after processing.

Conclusion

When it comes to your plating operations, simply rinsing isn’t good enough. You must implement good rinsing protocols to ensure fast and efficient rinsing each and every time.

There is no one way or concrete process that universally works best in rinsing. The analysis of many factors is necessary. We have the technical experts to help you make those decisions.