目的 在吸波剂表面化学吸附一层绝缘小分子，制备低介电常数且耐腐蚀的低频吸波剂。方法 通过机械化学处理活化合金粒子表面，增强山嵛酸与合金粒子间形成的化学吸附，从而制备具有低介电常数、光滑表面、高晶粒取向度和耐腐蚀的片状Fe50Ni50@山嵛酸吸波剂。结果 形成的山嵛酸包覆层可调控球磨过程中粉体间的冷焊效应和粉体受到的外界载荷，诱导Fe50Ni50粉体沿{111}晶面的滑移，促使粉体内形成{001}面织构。同时，绝缘且疏水的山嵛酸包覆层可阻碍粉体间导电网络的形成，降低片状Fe50Ni50吸波剂的介电常数，使粉体兼具低介电常数、高磁导率和耐腐蚀能力。结论 Fe50Ni50@山嵛酸吸波剂粒子展现出良好的低频吸波性能和耐腐蚀能力，为发展兼具优良耐环境性能和低频强吸收能力的新型吸波材料提供了一种思路。

The work aims to chemically adsorb a layer of small insulating molecules on the surface of microwave absorbent to prepare a low frequency wave absorbent of low permittivity and high corrosion resistance. The particle surface of alloywas treated by mechano-chemical ball milling to enhance the chemical adsorption between behenic acid and the absorbent, so as to prepare a flaky Fe50Ni50@behenic acid composite absorbent with low permittivity, smooth surface, high grain orientation and corrosion resistance. The behenic acid coating could regulate the cold-welding effect among powder, induce the slipping of Fe50Ni50 powder along the {111} crystal planes, and promote the formation of {001} texture in the powder. At the same time, the insulated and hydrophobic behenic acid coating could prevent the formation of conductive network among powder and reduce the permittivity of flaky Fe50Ni50. Thus, the powder had low permittivity, high permeability and corrosion resistance. In conclusion, Fe50Ni50@behenic acid wave absorbent particles show good low frequency wave absorption and corrosion resistance, which provides a new idea for developing new wave absorbing materials with excellent environmental resistance and strong low frequency wave absorption ability.