Ultrasonic Cleaning Solution
Cleaning solutions used in ultrasonic parts cleaners are an
important part of the cleaning process, since water alone is not effective at
cleaning the dirty part or product. They contain ingredients designed to
optimize cavitation and are selected based on the chemical and physical
properties of the contaminants and surface material. The cleaning solutions are
either water-based or solvents, which contain chemical or organic ingredients.
Surfactants, or wetting agents, are vital to thorough cleaning. They reduce the
surface tension of water. Cleaning solutions are also chosen based on their
flow characteristics-those with static fluid conditions facilitate the
formation of standing wave patterns, therefore maximizing cavitation strength.
Cleaning solutions are mainly composed of wetting agents and
detergents. Flammable solutions must be avoided because the solution is heated
to over 100 degrees F, creating a risk of fire. Solutions should never be
heated to more than 10 degrees F below their boiling point. Acids and bleach
are also seldom used because they damage so many materials, including stainless
steel, and create hazardous environments for ultrasonic cleaner operators.
Metal like stainless steel, iron and magnesium need highly caustic solutions,
while glass, ceramics and plastics need moderately alkaline or neutral
synthetic solutions. The level of cleaning solution must be carefully
monitored. If there is a noticeable decrease in the quality of the cleaning
action, the system needs to be refilled with cleaning agents. After the
ultrasonic cleaning process has finished, most systems rinse the objects or
parts clean of any leftover cleaning solutions.