【摘 要】
：
Hot corrosion behavior of Sm2(Co,Fe,Cu,Zr)17-type high-temperature magnetic alloy without and with a protective coating of Ni and Ni/Cr bilayer at 500℃ in a corrosive mixture of 75 wt％Na2SO4-NaCl for 100 h was reported in this paper.The obtained results o
【机 构】
：
Key Laboratory of Aerospace Materials and Performance(Ministry of Education),School of Materials Sci
论文部分内容阅读
Hot corrosion behavior of Sm2(Co,Fe,Cu,Zr)17-type high-temperature magnetic alloy without and with a protective coating of Ni and Ni/Cr bilayer at 500℃ in a corrosive mixture of 75 wt％Na2SO4-NaCl for 100 h was reported in this paper.The obtained results of time-dependent weight change established the parabolic growth of oxidized surface of bare magnets(8.87 mg·cm-2),which caused a rapid loss of magnetic properties measured both at room and high temperatures(500 ℃).X-ray diffraction(XRD)analysis revealed the growth of oxides for bare magnet and Cr-oxides(Cr2O3),top layer of Ni/Cr bilayer coating,but in the case of single coating,Ni-sul-fides formation indicated penetration of sulfur,which is further verified by electron probe microanalysis with energy dispersive spectroscopy(EPMA/EDS)study.Results showed that bilayer-coated samples(Ni/Cr)per-formed better than Ni-coated and bare samples.
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