(南昌航空大學(xué) 航空制造工程學(xué)院，南昌 330063)
摘 要: 在生物醫(yī)用Mg-0.6Cu合金的凝固過(guò)程中施加脈沖磁場(chǎng)處理，研究脈沖電壓對(duì)合金凝固組織、力學(xué)性能及生物腐蝕行為的影響。結(jié)果表明：隨著放電電壓的增加，在合金凝固組織逐漸細(xì)化的同時(shí)，第二相的數(shù)量也逐漸降低；當(dāng)脈沖電壓為300 V時(shí)，合金的屈服強(qiáng)度、抗拉強(qiáng)度和伸長(zhǎng)率均逐漸提高，其較未處理合金分別提高了49.4%、45.7%和114.3%；試樣在37 ℃的SBF溶液中的析氫速率、腐蝕速率和自腐蝕電流密度均逐漸降低，同時(shí)，其自腐蝕電位也逐漸向正向移動(dòng)，這表明合金的耐腐蝕性能逐漸提高。
關(guān)鍵字: 脈沖磁場(chǎng)；Mg-0.6Cu合金；組織；力學(xué)性能；生物腐蝕行為
（School of Aeronautical Manufacture Engineering, Nanchang Hangkong University, Nanchang 330063, China）
Abstract:The pulsed magnetic field (PMF) has been imposed during solidification of biodegradable Mg-0.6Cu alloy. The effects of discharging voltage on the solidification microstructure, mechanical properties and bio-corrosion behavior of Mg-0.6Cu alloy were studied. The results show that the solidification microstructure of Mg-0.6Cu alloy is further refined with the increase of the discharging voltage. Moreover, the volume fraction of second phase in the alloy is reduced by PMF. The mechanical properties of Mg-0.6Cu alloy are enhanced. The yield strength, ultimate tensile strength and elongation of the alloy treated by PMF at discharging voltage of 300 V are increased by 49.4%, 45.7% and 114.3%, respectively, compared to those of the alloy untreated by PMF. The PMF treatment is beneficial to the bio-corrosion resistance improvement of Mg-0.6Cu alloy. With the increase of the discharging voltage, the hydrogen evolution rate, corrosion rate and corrosion current density of the alloys gradually decrease, and the corrosion potential of the alloys, meanwhile, gradually move towards positive direction.
Key words: pulsed magnetic field; Mg-0.6Cu alloy; microstructure; mechanical property; bio-corrosion behavior
