Improvement of the corrosion resistance on Nd-Fe-B magnets with nickel plating
Improvement of the corrosion resistance on Nd-Fe-B magnets with nickel plating
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DOI：
10.1109/20.42430
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发表时间：
1989-03
期刊：
影响因子：
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通讯作者：
T. Minowa;M. Yoshikawa;M. Honshima
中科院分区：
文献类型：
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作者：
T. Minowa;M. Yoshikawa;M. Honshima
对镀镍处理后的烧结磁铁进行了湿度试验（80 ℃、90%RH）、高压釜试验（120 ℃、2atm的水蒸气饱和状态）、盐雾试验（35 ℃、5%NaCl）这3种腐蚀试验。为了进行比较，还将具有环氧树脂涂层、Al离子镀和没有涂层的样品暴露于腐蚀测试。在规定的腐蚀测试时间后，测量再磁化样品的永久磁通量损失。还观察到外观变化。结果表明，环氧树脂涂层由于其吸湿性能，在潮湿和高压釜试验中不能阻止水分的渗透。镍镀层和铝离子镀层相当好地经受了湿度和高压釜测试，但它们在盐雾测试中遭受轻微腐蚀。得出结论，使用镀镍可以提供高的耐腐蚀性和低的生产成本。>
Three kinds of corrosion tests, a humidity test (80 degrees C, 90% RH), an autoclave test (120 degrees C, 2 atm saturated with water vapor), and a salt spray test (35 degrees C, 5% NaCl), were performed on a sintered magnet treated with nickel plating. For comparison, samples with epoxy resin coating, Al ion plating, and without coating were also exposed to the corrosion test. After specified periods of corrosion testing, the permanent flux loss of the remagnetized sample was measured. Changes in appearance were also observed. It was found that the epoxy resin coating could not prevent the penetration of moisture in the humidity and autoclave tests because of its hygroscopic properties. The nickel plating and Al ion plating withstood the humidity and autoclave tests reasonably well, but they suffered slight corrosion in the salt spray test. It is concluded that the use of nickel plating can provide high corrosion resistance and low cost of production. >