摘要
为了提高镁粉(Mg)的稳定性,采用化学氧化的方法,以吡咯为单体,过硫酸铵为氧化剂,制备了聚吡咯包覆的聚吡咯/镁粉复合材料(PPy/Mg),利用透射电子显微镜(TEM)、傅里叶红外光谱(FTIR)对其表面形貌和化学成分进行了分析,并通过空气中的热重曲线对比了镁粉和聚吡咯/镁粉复合材料的抗氧化能力,通过极化曲线分析了PPy/Mg复合材料的腐蚀电位和腐蚀电流密度,通过交流阻抗图谱分析了PPy/Mg的阻抗特性。结果证明,通过化学氧化的方法,吡咯单体在镁粉颗粒表面发生聚合形成了聚吡咯包覆层,聚吡咯包覆能有效提高镁粉在空气中的热稳定性;聚吡咯包覆对镁粉的电化学腐蚀有一定抑制作用,腐蚀电位正移了70 mV,腐蚀电流密度降低了30%。
In order to improve the stability of magnesium powder(Mg),polypyrrole/magnesium powder(PPy/Mg)composites were prepared by chemical oxidation with pyrrole as monomer and ammonium persulfate as oxidant,the surface morphology and chemical composition were analyzed by transmission electron microscope(TEM)and Fourier infrared spectroscopy(FTIR),and the oxidation resistance was analyzed by comparing the thermogravimetric(TG)curves of Mg and PPy/Mg composites in the air,the corrosion potentials and corrosion current densities were also analyzed by using the polarization curves,impedance characteristics of PPy/Mg were analyzed by AC impedance spectrum.The results showed that the PPy coating was formed by the polymerization of pyrrole monomer on the surface of magnesium powder particles by chemical oxidation,the PPy coating could effectively improve the thermal stability of magnesium powder in the air,PPy coating had a certain inhibitory effect on the electrochemical corrosion of magnesium powder,which caused a positive shift of corrosion potential by 70 mV and the decrease of corrosion current density by 30%.
作者
高赛赛
徐司雨
姜菡雨
赵凤起
杨生春
GAO Saisai;XU Siyu;JIANG Hanyu;ZHAO Fengqi;YANG Shengchun(MOE Key Laboratory for Non-equilibrium Synthesis and Modulation of Condensed Matter,Xi’an Jiaotong University,Xi’an 710049,China;Science and Technology on Combustion and Explosion Laboratory,Xi’an Modern Chemistry Research Institute,Xi’an 710065,China)
出处
《新技术新工艺》
2020年第8期27-30,共4页
New Technology & New Process
关键词
聚吡咯
镁粉
化学氧化法
抗氧化
防腐
稳定性
PPy
magnesium powder
chemical oxidation process
oxidation resistance
anticorrosion
stability
