【摘要】 利用极化曲线和电化学阻抗谱技术研究了放电烧结NdFeB永磁材料在不同电化学环境下的腐蚀行为及其动力学过程．结果表明：在碱性环境中,磁体的电化学反应受表面电荷传递过程的控制,由于磁体表面形成了一层致密的保护膜,磁体表现出明显的钝化特征；在弱酸性环境中,磁体的电化学反应受表面活性物质吸附过程控制,磁体表面的阳极(富Nd相)区域存在电化学反应的活性通道,磁体因此很容易发生电化学腐蚀；与传统烧结磁体相比,放电等离子烧结磁体具有更好的耐蚀性．更多还原

【Abstract】 Polarization curve and electrochemical impedance spectroscopy(EIS)tests were applied to investi- gate the corrosion behaviors and corrosion kinetics of spark plasma sintering NdFeB magnets in different elec- trolytes.The results show that in alkaline solution the electrochemical reaction of the magnets is controlled by the step of surface charge transfer i.e.activation polarization process,the magnet with a compact passivation layer on their surface exhibits evident passive behavior in this circumstance;in weak acid solution,the electro- chemical reaction of the magnets is controlled by the step of active substances adsorption process,the magnet is susceptible to corrosion in this environment since there are many active reaction channels in the anodic(Nd- rich phase)areas.Compared with conventional sintered NdFeB magnet,SPS NdFeB magnet possesses excel- lent corrosion resistance.更多还原