Ultrasonic Cleaning
The application of energy to a cleaning solution such as an alkaline soak cleaner, a surfactant type of buffing compound remover, or a solvent, in the form of high frequency sound wave above 20,000 Hz in the inaudible range, has proved very effective for removing hard-to-remove soil from inaccessible places as crevices, blind holes, and gear teeth. Each application of ultrasonic cleaning has to be engineered and applied for the job at hand. Ultrasonics is a tool for making a good cleaner work better.
Machine Cleaning
Most rapid alkaline degreasing is accomplished by spray washing in an automatic or semiautomatic machine. In order to justify the expense of such an installation, the volume of work must be large. In spray washing machines the mechanical force of the spray in addition to the chemical and physical action of the cleaning solution speeds up the cleaning process. The important use is for precleaning of metals to remove large excesses of soils.
Electrocleaning
Although it is possible to clean work effectively in soak tanks, electrocleaning is the most reliable method of preparing surface for electroplating. In electrocleaning the work is made either cathode (direct current) or anode (reverse current); in either case gas is generated at the metal surface and assist in dislodging the soil, and at the same time brings up fresh cleaning solution.
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