目的 研究烧结NdFeB材料在工序间的腐蚀行为以及植酸的防锈作用和机制.方法 通过SEM、EDS、XRD和XPS测试了试样的表面形貌、元素成分、相成分和元素结合能状态.结果 NdFeB的晶间富钕相在工序间发生严重腐蚀,造成主相晶粒脱落,不利于镀层结合力.结论 植酸有效地抑制了工序间的腐蚀,其作用机制主要是植酸分子在NdFeB表面的吸附.钕、磷、氧等元素的结合能变化也表明这种吸附包括化学吸附的作用.
The work aims to study corrosion behaviors of sintered NdFeB in interprocess as well as rust inhibition and me-chanism of phytic acid. Surface morphology, elements composition, phase composition and element bonding energy state were tested with SEM, EDS, XRD and XPS, respectively. NdFeB was subject to serious corrosion in intergranular Nd-rich phase and thereby principal phase grain fell off, which was harmful to the coating adhesion. Phytic acid can efficiently inhibit the inter-process corrosion by adsorption by adsorption of phytic acid on the surface of NdFeB. The change of bonding energy in Nd, P and O elements also shows the effects of adsorption including chemical adsorption.
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