Ultrasonic & Ozone Content Cleaning Flashcards

What is the primary mechanism by which ultrasonic cleaners remove contaminants from items?

Answer: Acoustic cavitation caused by high-frequency sound waves

Ultrasonic cleaners work through acoustic cavitation, where high-frequency sound waves create microscopic bubbles that implode and dislodge contaminants.

Which frequency range is typically used in restoration-grade ultrasonic cleaning equipment?

Answer: 20–40 kHz

Restoration ultrasonic cleaners operate at 20–40 kHz, just above the upper limit of human hearing, providing effective cavitation for content cleaning.

How does increasing the temperature of an ultrasonic cleaning solution affect cavitation as it approaches the boiling point?

Answer: Cavitation initially increases then decreases as boiling point is approached

Cavitation initially increases with temperature but then decreases near boiling because vapor pressure rises and bubbles collapse with less force.

Which category of item is most at risk of damage from ultrasonic immersion cleaning?

Answer: Circuit boards with surface-mounted components

Ultrasonic vibration can cause solder joint fatigue and detach delicate surface-mounted electronic components, making circuit boards high-risk items.

What pH range is most effective for ultrasonic cleaning solutions targeting smoke and soot residues?

Answer: Mildly alkaline (pH 8–10)

Mildly alkaline solutions (pH 8–10) saponify and emulsify smoke residues effectively without damaging most content materials.

Why must cleaning baskets be suspended above the bottom of an ultrasonic tank rather than resting directly on it?

Answer: To allow cavitation to develop fully beneath the items

Items placed directly on the transducer plate block wave transmission; suspending the basket allows cavitation to develop uniformly around all surfaces.

When ultrasonic-cleaning silverware alongside other metals, what is the critical precaution to observe?

Answer: Never mix silver with dissimilar metals in the same batch

Mixing dissimilar metals in an electrolyte solution creates galvanic corrosion that can permanently damage the items.