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  ①影响镀前处理时用酸、用碱均不宜太强，且忌用盐酸；②预镀(或直接镀)时若选择简单盐镀液类型，极易造成零件氧化而影响镀层与基体的结合力，且零件受到腐蚀并将镀液污染；③难以选择大尺寸的滚筒，否则混合周期的影响较大，零件氧化严重。 (2)钕铁硼产品为磁功能材料，任何表面涂覆都可能对其磁性能产生影响，所以如何协调镀层的种类、组合及厚度等与产品磁性能的关系，是钕铁硼电镀的一大难点。 (3)钕铁硼表面疏松多孔、粗糙不平，这不仅给镀前处理带来较大负担，更主要的是预镀(或直接镀)工艺的选择受到较大限制，即无法选择镀层结合力好、耐蚀性好但电流效率低的络合物镀液(如碱铜、柠檬酸镀镍、碱锌等)。 (4)钕铁硼材质脆性大，极易受到磕碰而损坏，这不仅增加工人操作上的困难，更主要的是难以选择大尺寸的滚筒，从而影响劳动生产效率的提高。江西钕铁硼永磁铁