Get Powerful Ultrasonic Cleaning With Deionized Water

Get Powerful Ultrasonic Cleaning With Deionized Water

Ultrasonic cleaners work by producing cavitation effects that clean the surface of the object. Formation of ultrasound-induced microbubbles followed by their immediate condensation and collapse causes this cavitation. Much of the effectiveness arises from the specific cleaning chemistry that the liquid induces.

Cleaning chemistry refers to the chemical interaction between the cleaning liquid and the surface contaminants. These contaminants include grease, dirt and trapped surface particles. One of the best cleaning liquids available is deionized or DI water. It is the ideal cleaning liquid for ionic contaminants such as salts. Deionized water usage allows ultrasonic cleaning without leaving spots or residues on the surface of the object or part.

The key to the efficacy of deionized water, as a powerful ultrasonic cleaning agent, lies in the absence of ions within it. This ionic vacuum' produces a powerful attraction toward all ion-containing solids on the surface of the part or object that needs cleaning. It is literally thirsty for ions. Along with the ultrasound-induced cavitation shocks, it dislodges or drags the dirt particles out from the surface with greater force.

Pure deionized water has a very high surface tension, requiring high energies to transmit the cavitation shocks to the surface of the contaminated tool. A dramatic reduction in its surface tension occurs by adding relatively small fractions of a surface-active detergent to the DI water. This lower surface tension promotes the formation of enhanced cavitation shock and an easier, faster release of the contaminants into the active liquid. In turn, it needs less power to provide effective cleaning.

Since deionized water is an expensive liquid, it needs preservation. Its affinity for ions will even drag ions out of the stainless steel tank if left standing for a while. This will substantially reduce its cleaning power. Accordingly, you must load the ultrasonic cleaner tank with the mixed detergent-deionized water fluid only when it is ready for imminent use, prior to beginning the heating process. After finishing the ultrasonic cleaning task, usually the cleaned object or part requires rinsing in a rinse-tank. To eliminate the possibility of spot residue formation, the rinsing liquid too should be deionized water, possibly of a lower grade.

There are different purity grades of DI water classified by their electrical resistance it is a poor electricity conductor. The choice of which grade to use depends on the stringency imposed by the application. The rating for ultra-pure DI water is 18 mega-ohms, while a lower-purity grade available has a rating of 10 mega-ohms. You can use deionized water a few times before throwing it away, or regenerate it in-house.

To process small quantities of material for cleaning, a single ultrasonic cleaner-rinse tank combination will do. For larger throughputs of contaminated material, you need more elaborate multiple ultrasonic cleaner-rinse tank units. These can range from simpler once-through units to filtered, closed-loop units with recycled DI water, where you add make-up DI water to maintain its purity level. Automated units for higher throughputs are available, with multiple tanks and cleaners. They sense DI water purity levels and add just the right amount of fresh DI water to maintain cleaning efficiencies. The throughput, specific application and degrees of cleanliness dictate the overall process design.

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