Fatimah Siti, Hazmatulhaq Farah, Sheng Yujun, Suhartono Tri, Oh Jeong Moo, Nashrah Nisa, Kang Jee-Hyun, Ko Young Gun
School of Materials Science and Engineering, Yeungnam University, Gyeongsan 38541, Republic of Korea.
Materials (Basel). 2023 Aug 2;16(15):5424. doi: 10.3390/ma16155424.
This study explores the application of ultrasonic vibration during plasma electrolytic oxidation (PEO) to enhance the corrosion resistance of magnesium (Mg) alloy. To this end, three different ultrasonic frequencies of 0, 40, and 135 kHz were utilized during PEO. In the presence of ultrasonic waves, the formation of a uniform and dense oxide layer on Mg alloys is facilitated. This is achieved through plasma softening, acoustic streaming, and improved mass transport for successful deposition and continuous reforming of the oxide layer. The oxide layer exhibits superior protective properties against corrosive environments due to the increase in compactness. Increasing ultrasonic frequency from 40 to 135 kHz, however, suppresses the optimum growth of the oxide layer due to the occurrence of super-soft plasma swarms, which results in a low coating thickness. The integration of ultrasonic vibration with PEO presents a promising avenue for practical implementation in industries seeking to enhance the corrosion protection of Mg alloys, manipulating microstructures and composition.
本研究探讨了在等离子体电解氧化（PEO）过程中应用超声振动来提高镁（Mg）合金的耐腐蚀性。为此，在PEO过程中使用了0、40和135 kHz三种不同的超声频率。在超声波存在的情况下，有助于在镁合金上形成均匀致密的氧化层。这是通过等离子体软化、声流以及改善质量传输来实现的，从而成功地沉积并持续重整氧化层。由于致密性增加，氧化层对腐蚀环境具有优异的保护性能。然而，将超声频率从40 kHz提高到135 kHz会由于超软等离子体群的出现而抑制氧化层的最佳生长，导致涂层厚度较低。超声振动与PEO的结合为寻求增强镁合金腐蚀防护、控制微观结构和成分的行业提供了一条有前景的实际应用途径。
