Anti-corrosion properties of micro-arc oxidation films on AZ31 magnesium alloy irradiated by high-intensity pulsed ion beam

作者：Han Xiao Guang; Lei Ming Kai; Zhu Xiao Peng; Shan Ying Chun; Xu Jiu Jun^*

来源：Chinese Journal of Nonferrous Metals, 2012, 22(2): 337-342.

• 3.5%Nacl
• Active dissolution
• Anti-corrosion property
• Applied research
• AZ31 magnesium alloy
• Blocking effect
• Breakdown potential
• Corrosion behavior
• Corrosion property
• Cross-section morphology
• High-intensity pulsed ion beams
• Ion current density
• Microarc oxidation
• Polarization curves
• Sealing layers

The microarc oxidation (MAO) films on the AZ31 magnesium alloy were modified by high-intensity pulsed ion beam (HIPIB) at an ion current density of 200 A/cm2 with 1-10 shots. The surface and cross-section morphologies of the MAO films were characterized by scanning electron microscopy (SEM). The polarization curves of the MAO films were measured by Princeton Applied Research 2273. The results show that a continuous and compact sealing layer forms on the MAO films by HIPIB with 5 shots. The polarization curves in 3.5% NaCl solution show that the corrosion behaviors of the MAO films transit from active dissolution of original films to pitting-breakdown of irradiated, and the breakdown potential achieves to -800 mV (vs SCE) at ion current density of 200 A/cm2 with 5 shots. The noticeable improvement in the corrosion properties of MAO films is attributed to the blocking effect of the sealing layer that hinders the process of electrolyte penetrating the MAO films to the magnesium alloy.

• 出版日期2012