Quality magnetic coatings applied directly to the product's life

Experiments that, 1cm³ NdFeB permanent magnets on the air 150 ℃ of stay 51 days, will all be oxidized etched. In weak acid solution, it is more susceptible to corrosion. To make NdFeB durable, require it to have 20--30 years of life, it must be subjected to a surface anti-corrosion treatment, in order to resist the corrosive medium on the magnet against corrosion. Currently, NdFeB permanent magnet manufacturing industries widely used metal plating, chemical plating + metallization, electrophoretic coating and phosphate processing methods, the magnet surface coated with a layer of additional spacers, the magnet surface and the corrosive medium isolated to prevent violations of media trap magnets . 1, generally zinc, nickel + copper + nickel + copper + nickel electroless nickel plating three technology-based, other metal plating requirements are generally applied in other metal plating after nickel. 2, in some special cases will use phosphate: (1) NdFeB super neodymium magnets products because of turnover, save for too long without a clear follow-up of the surface treatment method when using phosphide simple; ( 2) When the adhesive force of the magnet need epoxy adhesive junction, painting, etc., glue, paint and other organic matter needs epoxy matrix invasion have good performance. Phosphating process can improve the infiltration capacity of the magnet surface. 3, electrophoretic coating has become one of the anti-corrosion surface treatment technology is widely adopted. Not only because of its porous surface of the magnet and the binding force of good, and are resistant to salt spray, acid, alkali and other corrosion, excellent resistance to corrosion. But its heat-resistant properties inferior compared with spray coating. Customers can request for their products work carried plating options. With the expansion of electrical use in the field of corrosion NdFeB customers have higher requirements. The HAST test (also known as PCT test) is a specialized test sintered NdFeB permanent magnets in the humid and high temperature environment of corrosion resistance. And how customers judge coating meets demands? The purpose is to salt spray test surface treated by anti-corrosion coating sintered NdFeB magnets make rapid corrosion test, when the end of the experiment, the samples were removed from the chamber, dried and eyes or a magnifying glass to observe the sample surface without spots , spot size of the area box changes color.