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22
2019
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02
Ultrasonic cleaning equipment technology applied to electroplating pretreatment
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Today, as the requirements for electroplating production have become more stringent, the associated manufacturing processes have also evolved accordingly. To ensure that the quality of electroplating is not compromised, workpieces must be thoroughly cleaned prior to plating, thereby significantly improving their cleanliness. Ultrasonic cleaning is an ideal method for this purpose. Below is a brief overview of ultrasonic cleaning processes applied to several common types of workpiece surface conditions: 1. Cleaning of polishing compounds from polished surfaces. Typically, polishing compounds are formulated with paraffin wax, which has a high molecular weight and a relatively high melting point. At room temperature, it remains solid and is thus a particularly challenging substance to remove. Traditional cleaning methods—such as using organic solvents or boiling in high-temperature alkaline solutions—have numerous drawbacks. By contrast, ultrasonic cleaning allows the use of water-based cleaning agents.
Today, as the requirements for electroplating production have become more stringent, the associated manufacturing processes have also evolved accordingly. To ensure that the quality of electroplating is not compromised, workpieces must be thoroughly cleaned before plating to achieve higher cleanliness levels. Ultrasonic cleaning is an ideal method for this purpose.
An introduction to the ultrasonic cleaning process for several common workpiece surface conditions:
1. Cleaning of polishing paste from the surface of polished parts. Typically, polishing pastes are formulated with paraffin wax, which has a high molecular weight and a relatively high melting point. At room temperature, it remains solid and is thus rather difficult to remove. Traditional cleaning methods—such as using organic solvents or boiling in high-temperature alkaline solutions—have numerous drawbacks. By contrast, ultrasonic cleaning allows the use of water-based cleaning agents, enabling thorough cleaning of the part’s surface within just a few minutes under moderate temperatures. A common process flow is as follows: ① Soaking → ② Ultrasonic cleaning → ③ Rinsing with clean water (purified water).
2 Cold-rolled steel sheets with oil and a small amount of rust on the surface. Typically, cold-rolled steel sheets have oil, dirt, or a slight layer of rust on their surfaces, making them relatively easy to clean. However, after conventional cleaning methods, a very thin layer of loose dust often remains on the workpiece surface, adversely affecting the quality of subsequent processing operations. In some cases, it becomes necessary to resort to soaking the parts in strong acids to remove this residual dust layer. By contrast, using ultrasonic cleaning combined with an appropriate cleaning solution allows for quick and thorough cleaning of the workpiece surface, while also enhancing the surface activity of the parts. In certain situations, this approach can even eliminate the need for the acid pickling and activation step typically required before electroplating.
3. Workpieces with oxide scale and yellow rust on their surfaces. Traditionally, these are cleaned by soaking them in hydrochloric or sulfuric acid. However, by employing an integrated ultrasonic treatment technique, oil and rust can be removed from the workpiece surface quickly—in just a few minutes—while simultaneously avoiding the hydrogen embrittlement issues often associated with strong-acid cleaning. Utilizing the cavitation effect generated by ultrasound in liquids, oil contaminants adhering to the workpiece surface can be effectively removed. Combined with the appropriate cleaning agents, this method enables rapid attainment of high cleanliness levels on the workpiece surface. Electroplating processes demand particularly high surface cleanliness, and ultrasonic cleaning technology represents an ideal solution for meeting these stringent requirements.
Ultrasound cleaning technology can replace solvent-based cleaning for removing oil contamination; it can also replace electrochemical degreasing; and it can substitute strong acid etching to remove rust and oxide scale from the surfaces of carbon steel and low-alloy steel. The application of ultrasound cleaning technology simplifies many traditional cleaning processes and significantly improves both cleaning quality and production efficiency. It is particularly advantageous for workpieces with complex shapes and stringent requirements for edges and corners.
By utilizing ultrasonic cleaning technology, it is possible to largely replace the role of strong acids and strong bases, significantly reducing environmental pollution and improving workers' working conditions, thereby lowering labor intensity and making a contribution to the protection of the ecological environment.
For more details, please stay tuned. Qiaofu Hardware Official website or scan the QR code
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