CAJ | 학술논문

针对合金元素 Sn 对轧制态镁基阳极材料显微组织及电性能的影响，探讨其提高海水电池用镁阳极材料电化学性能的途径。采用金相显微镜、X 射线衍射、扫描电镜，结合能谱分析了 Sn 含量对轧制态镁阳极材料显微组织、相结构、表面形貌及成分分布的影响；通过恒电流法、动电位极化法、排水集气法等研究了该镁合金的腐蚀行为和电性能。研究结果表明：随着Sn 含量的增加，合金晶粒愈加细小，且球形颗粒相 Mg2 Sn 析出逐渐增多。轧制处理使大部分β-Mg17 Al12相溶解，残留 Mg2 Sn 未溶相；Sn 的加入可以提高镁合金放电电压和电流效率，降低析氢率。由于镁合金的“负差数效应”使得析氢率随电流密度的增大而增大；腐蚀产物主要成分为 MgO 和 Al2 O3，且疏松，易脱落，使镁合金阳极的工作电极电位负而且稳定，可促进电池反应深入进行。
침대합금원소 Sn 대알제태미기양겁재료현미조직급전성능적영향，탐토기제고해수전지용미양겁재료전화학성능적도경。채용금상현미경、X 사선연사、소묘전경，결합능보분석료 Sn 함량대알제태미양겁재료현미조직、상결구、표면형모급성분분포적영향；통과항전류법、동전위겁화법、배수집기법등연구료해미합금적부식행위화전성능。연구결과표명：수착Sn 함량적증가，합금정립유가세소，차구형과립상 Mg2 Sn 석출축점증다。알제처리사대부분β-Mg17 Al12상용해，잔류 Mg2 Sn 미용상；Sn 적가입가이제고미합금방전전압화전류효솔，강저석경솔。유우미합금적“부차수효응”사득석경솔수전류밀도적증대이증대；부식산물주요성분위 MgO 화 Al2 O3，차소송，역탈락，사미합금양겁적공작전겁전위부이차은정，가촉진전지반응심입진행。
According to the effect of elements Sn on the micro structure and electrical properties of rolled anode material- magnesium-based alloy,the ways are explored to improve electrochemical properties of magnesium anode materials for marine battery.The effect of elements Sn on the micro structure,phase structure,morphology and the composition distribution of the rolled magnesium-based alloy is investigated by metallographic microscopy,X-ray diffraction (XRD ),scanning electron microscope (SEM)and energy dispersive spectroscopy (EDS)respectively.Its corrosion behavior and <br> electrochemical properties are also tested by constant current method,potentiodynamic polarization,air collection in drainage process,etc.The results show:With the increase of Sn content,magnesium alloys present fine grain size,and spherical particle phase of Mg2 Sn precipitation gradually increases.After rolling treatment,most of β-Mg17 Al12 phase is dissolved,while most of Mg2 Sn is not dissolved.Sn improves the discharge potential and current efficiency and reduces release hydrogen rate.With the current density rises,the release hydrogen rate increases,owing to negative variance effect of magnesium alloys.The main composition of the corrosion products are MgO and Al2 O3 that are easier to be peeled off,which leads the work potential of magnesium anode to be negative and stable ,and accelerates reaction continuously.