Mingzhu Metal Introduces Electrochemical Polishing Equipment

　　Mingzhu Metal Co., Ltd., specialized in the R&D and production of various valve products, produces industrial valves, food-grade sanitary valves, and semiconductor clean valves. The company also manufactures pneumatic control valves and provides OEM manufacturing for valve parts. In November, Mingzhu will introduce "electrochemical polishing equipment" to perform ultra-clean ball valve internal surface polishing technology, which will be of great benefit to industries such as optoelectronics, semiconductors, aerospace, and biotechnology.

　　Lu Jin-xiang, General Manager of Mingzhu Metal, stated that the company was established in 1979, initially focusing on the R&D and production of hand tool hardware. In 1993, to cope with expanding business volume, the factory relocated to its current site in Taichung Industrial Park and transformed to produce high-value-added stainless steel valve products. In addition to in-house R&D and production, the company cooperates with well-known manufacturers in Italy and Japan for OEM production of various valve parts. The stainless steel precision casting ball valves produced by the company have advanced to the semiconductor level, including valve products used in the TFT-LCD and LED electronic industries. The facility is equipped with Class 10,000 and Class 1,000 cleanrooms.

　　Lu pointed out that high-precision and high-performance valve products play a crucial role in rigorously controlled operating environments. Taking the clean valves produced by the company as an example, the product has high leak-proof performance. Tested by the Metal Industries Research & Development Centre using a helium leak detector, the test value was 10 to the power of negative 9. The product also features a special "pipeline cleaning connector" design, allowing nitrogen to clean the pipeline through this point, accelerating production schedules.

　　Lu further stated that due to the increased demand for internal smoothness, cleanliness, and corrosion resistance of control valves used in optoelectronic processes, past treatment methods faced technical limits. For example, buffing leaves grinding marks due to local pressure, causing metal powder and grease to embed in grain boundaries; chemical passivation cannot remove the deformed layer or improve roughness; electrolytic polishing easily causes excessive corrosion at grain boundaries and pitting defects on the surface; the electrolyte preparation for chemical polishing is complex, and its storage and management are critical; and bright heat treatment cannot improve surface roughness.