电参数对AZ31B镁合金微弧氧化膜能耗及耐蚀性的影响
Effect of Electrical Parameters on Energy Consumption and Corrosion Resistance of Micro-arc Oxidation Coating on AZ31B Mg-alloy
田梦真 1王勇 2李涛 3汪川 2郭泉忠 2郭建喜4
作者信息
- 1. 辽宁大学化学院 沈阳 110036
- 2. 中国科学院金属研究所 沈阳 110016
- 3. 滨州魏桥国科高等技术研究院山东省先进铝基材料与技术重点实验室 滨州 256600
- 4. 海军勤务学院 天津 300450
- 折叠
摘要
微弧氧化可提高镁合金表面的耐腐蚀性,但微弧氧化存在能耗高的不足,限制其在镁合金部件上的大规模应用.为降低微弧氧化的能耗,采用脉冲微弧氧化电源在AZ31B镁合金表面制备微弧氧化膜层,通过盐雾实验、电化学测试、扫描电镜等表征手段,研究恒流模式下电参数(频率、占空比、电流密度)对膜层单位能耗和耐蚀性能的影响.结果表明,频率对膜层单位能耗影响较小,但频率越高,膜层耐蚀性能越好;占空比对能耗的影响比较明显,随占空比的升高,膜层单位能耗减小,但耐蚀性能降低;电流密度也显著影响能耗,电流密度越大,膜层单位能耗越大,但电流密度变化对膜层的耐蚀性能影响较小.
Abstract
Micro-arc oxidation(MAO)can improve the corrosion resistance of Mg-alloys,but it has the deficiency of high energy consumption,which restricts its large-scale application on Mg-alloy compo-nents.In order to reduce the energy consumption of micro-arc oxidation,micro-arc oxidation coatings were prepared on the surface of AZ31B Mg-alloy in an electrolyte of Na2SiO3 20 g/L,NaOH 2 g/L and NaF 2 g/L by pulsed power supply,and the effects of electrical parameters(frequency,duty cycle and cur-rent density)on the unit energy consumption and corrosion resistance of the coatings were studied by means of scanning electron microscopy,electrochemical testing and salt spray test.The results show that the frequency has less effect on the unit energy consumption of the coatings,but the higher the fre-quency,the better the corrosion resistance of the coatings;the duty cycle has more obvious effect on the energy consumption,with the increase of the duty cycle,the unit energy consumption of the coatings de-creases,but the corrosion resistance decreases;the current density also has a significant influence on the energy consumption,the higher the current density,the higher the unit energy consumption of the coatings,but the change of current density has less effect on the corrosion resistance of the coatings.
关键词
微弧氧化/镁合金/能耗/耐蚀性Key words
Micro-arc oxidation/Mg-alloy/energy consumption/corrosion resistance引用本文复制引用
基金项目
魏桥国科高研院-中科院金属研究所研发项目(GYY-JSBU-2022-006)
出版年
2024
NETL
NSTL
万方数据