Ultrasonic cleaners have revolutionized the cleaning industry by using high-frequency sound waves to remove contaminants from surfaces. However, many users overlook a critical step that significantly enhances the cleaning process: degassing. But what exactly is degassing, and why is it so important? This article explores the science behind degassing and its practical benefits for ultrasonic cleaning performance.
Degassing is the process of removing dissolved gases from liquids. In ultrasonic cleaning, these gases form micro-bubbles that can interfere with the formation and collapse of cavitation bubbles—the primary mechanism responsible for cleaning.
How It Works:
Ultrasonic waves create alternating high-pressure and low-pressure cycles in the liquid.
During low-pressure cycles, dissolved gases escape and form micro-bubbles.
These bubbles absorb ultrasonic energy, reducing the efficiency of cavitation.
Degassing removes these gases, allowing cavitation bubbles to form and collapse optimally.
Enhanced Cavitation:
Without degassing, micro-bubbles act as "cushions" that dampen ultrasonic energy. This reduces the intensity of cavitation, leading to longer cleaning times and inferior results. Degassing ensures that ultrasonic waves directly act on contaminants, maximizing cleaning power.
Consistent Performance:
Dissolved gases can cause uneven cleaning, especially in complex parts with intricate geometries. Degassing creates a uniform environment for cavitation, ensuring every surface receives equal attention.
Preventing Damage:
In some cases, trapped gases can cause cavitation bubbles to collapse unevenly, leading to surface damage on delicate items. Degassing minimizes this risk by stabilizing the liquid medium.
High-Precision Applications:
Industries like aerospace, medical, and electronics require impeccable cleaning standards. Degassing is essential here to ensure no residue or damage occurs.
Using Tap Water:
Tap water contains more dissolved gases than distilled or deionized water. If using tap water, degassing is highly recommended.
After Changing Solutions:
Whenever the cleaning solution is replaced, degassing should be performed to eliminate gases introduced during pouring or mixing.
Manual Degassing:
Fill the tank with the cleaning solution.
Set the temperature to 40-50°C (104-122°F). Warm water holds less gas.
Run the ultrasonic cleaner for 5-10 minutes without any items inside.
Observe bubbles rising to the surface—this indicates gases are being released.
Automatic Degassing:
Many modern ultrasonic cleaners feature a dedicated degas function. This mode typically runs at a specific frequency and power level optimized for gas removal.
Pro Tips:
Degas for longer periods (15-20 minutes) if the solution is heavily saturated with gases.
Use a lid to minimize gas re-entry during the process.
For critical applications, use distilled water to reduce initial gas content.
Skipping Degassing:
Assuming the cleaner is ready to use immediately after filling can lead to subpar results. Always degas when using a new solution or after prolonged inactivity.
Overheating the Solution:
Excessive heat (>60°C) can accelerate chemical reactions in the solution, reducing its effectiveness. Stick to the recommended temperature range.
Ignoring Solution Type:
Some cleaning solutions foam excessively during degassing. If this occurs, reduce the power level or use a defoaming agent.
Warmer liquids hold less dissolved gas, making degassing more efficient. However, temperature must be balanced with the chemical stability of the cleaning solution. For most applications, 40-50°C is ideal.
Regular degassing can extend the life of cleaning solutions by reducing oxidative degradation caused by dissolved oxygen. This is particularly beneficial for expensive or specialized solutions.
Vacuum Degassing:
Some industrial-grade cleaners integrate vacuum systems to remove gases more efficiently. This method is faster and more thorough but requires specialized equipment.
Pulsed Degassing:
Alternating between high and low power during degassing can improve gas removal without overheating the solution.
Jewelry Cleaning:
Degassing ensures that tiny crevices in jewelry are thoroughly cleaned without residue.
Medical Instruments:
Removing gases prevents biofilm formation and ensures sterilization compliance.
Electronics Manufacturing:
Degassing eliminates the risk of micro-bubble-induced damage to sensitive components.
How often should I degas?
Degas every time you change the cleaning solution or if the cleaner has been idle for more than a day.
Can I skip degassing for quick cleanings?
For non-critical applications, you may skip degassing, but expect reduced efficiency.
Does degassing consume a lot of time?
Typically, 5-15 minutes is sufficient. This small investment in time pays off with significantly better cleaning results.
Degassing is not just an optional step—it is a fundamental process that unlocks the full potential of ultrasonic cleaners. By removing dissolved gases, users can achieve faster, more consistent, and higher-quality cleaning results while protecting delicate items from damage. Whether you are cleaning jewelry, medical instruments, or industrial parts, incorporating degassing into your routine will ensure optimal performance and longevity of your equipment. Remember, a few minutes spent degassing can save hours of re-cleaning or costly repairs.
