Ultrasonic Cleaning Temperature Guide
Learn why ultrasonic cleaning temperature affects cavitation, oil removal, cleaning speed, equipment stability, and why 40–60°C gives better stable results.
How Does Temperature Affect Ultrasonic Cavitation?
The core principle of ultrasonic cleaning is cavitation:
• High-frequency vibration generates tiny bubbles in the liquid. When the bubbles collapse, they release impact waves that remove contaminants from the surface.
Temperature directly affects three key factors:
1. Lower Viscosity → Bubbles Form More Easily
• When the liquid becomes warmer, cavitation is easier to generate.
2. Lower Surface Tension → Bubbles Become Finer and More Uniform
• Fine bubbles can penetrate blind holes, gaps, and microstructures more effectively.
3. Bubble Collapse Strength Changes with Temperature
• Too low: bubbles are difficult to generate.
• Too high: bubbles become too large, and the collapse force decreases.
Why Is 40–60°C the Best Cleaning Performance Range?
40°C: Starts Improving Degreasing Ability
• Machining oil and cutting oil begin to soften and dissolve faster above 40°C.
50°C: Cavitation Activity Increases and Oil Contamination Breaks Down Faster
• Most metal workpieces and hardware parts achieve the best cleaning performance around 50°C.
60°C: Highest Overall Efficiency and Most Commonly Used
• Cavitation intensity, oil dissolution, and degreasing ability reach the best overall balance.
What Happens If the Temperature Is Too Low or Too High?
Temperature Too Low (<30°C)
• Liquid viscosity is high.
• Cavitation bubbles are difficult to form.
• Degreasing performance is poor.
• Cleaning speed becomes slower.
Temperature Too High (>65°C)
• Bubbles become too large, and collapse energy decreases.
• Cleaning performance may become worse instead.
• The cleaning solution may become unstable due to excessive reaction.
• Some materials may deform.
The heating temperature for ultrasonic cleaning is not simply “the higher, the better.” It should be adjusted according to oil properties, workpiece material, and cleaning solution characteristics.
Most cleaning conditions can achieve the best balance at 40–60°C.
YONG JI Enterprise can provide complete temperature setting recommendations based on process requirements, helping customers create a more efficient ultrasonic cleaning process.
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