摘要
对烧结NdFeB磁体作A1-Mn合金镀可以提高其耐腐蚀性能，但这只能在无水体系中进行。以MnCl2-AICl3-BMIC（氯化1-丁基-3-甲基咪唑）为离子液体（A1C1，与BMIc的摩尔比为2：1），对NdFeB磁体电沉积Al-Mn合金。采用SEM扫描电镜观察了Al-Mn镀层的形貌，采用x射线衍射分析了相结构，采用3．5％NaCl溶液测试了耐腐蚀性能；探讨了离子液体中MnCl2浓度对Al-Mn合金镀层结构及性能的影响。结果表明：NdFeB磁体表面电沉积Al—Mn合金，当离子液体中MnCl2浓度为0．05～0．25mol／L时，Al-Mn合金镀层的结构由晶态逐渐转变为非晶态，耐腐蚀性能显著提高，且优于铝镀层。
MnCL_2 and A1Cl_3 were introduced into 1-buty1-3-methyl imidazol chloride(denoted as BMIC) ionic liquid(the molar ratio of A1C1_3 to BMIC was 2:1) to conduct electrodeposition of Al-Mn alloy coatings on the surface of NdFeB magnet.The morphology of as-obtained Al-Mn alloy coatings was observed with a scanning electron microscope,and their phase composition was determined with an X-ray diffractometer.Furthermore,the corrosion resistance of the coatings in 3.5%NaCl solution was measured,and the effect of the concentration of MnCl_2 in BMIC solution on the microstructure and properties of Al-Mn alloy coatings was investigated.Results showed that,when MnCl_2 concentration in the ionic liquid rose from 0.05 mol/L to 0.25 mol/L,Al-Mn alloy coatings experienced gradual structure transformation from crystalline into amorphous,and their corrosion resistance,better than that of electrodeposited Al coating,increased therewith.
出处
《材料保护》
CAS
CSCD
北大核心
2013年第7期5-7,4,共3页
Materials Protection
基金
国家科技支撑计划项目(2012BAE02B01)
中国博士后科学基金(2012M511906)
宁波市自然科学基金(2012A610053)资助
