Ni-Fe-W-B非晶合金的晶化行为及其电化学腐蚀特性研究
发布时间：2018-07-18 15:12
【摘要】：采用单辊急冷法制备了57.5Ni-24.5Fe-14.5W-3.5B(质量分数,%)非晶薄带,并在不同温度下进行退火。用DSC和XRD分析了非晶薄带的晶化行为及析出相的演变过程;用电化学极化曲线及电化学阻抗法研究了试样在3.5%NaCl溶液中的电化学腐蚀行为;用SEM和EDS分析了试样腐蚀后的表面显微形貌及成分。结果表明:该非晶薄带的晶化过程分为3步,其晶化温度约为430,470和700℃;退火试样的耐腐蚀性整体优于非晶合金样,部分晶化试样的抗电化学腐蚀性能优于完全晶化试样;500℃退火试样表面形成致密钝化膜,抗腐蚀性能优异,而非晶薄带和720℃退火试样形成的钝化膜不稳定,易被点蚀和局部腐蚀。
[Abstract]:Amorphous ribbons of 57.5Ni-24.5Fe-14.5W-3.5B (wt%) were prepared by single roll quenching method and annealed at different temperatures. The crystallization behavior and evolution process of the amorphous ribbons were analyzed by DSC and XRD, the electrochemical corrosion behavior of the samples in 3.5 NaCl solution was studied by electrochemical polarization curve and electrochemical impedance method. SEM and EDS were used to analyze the microstructure and composition of the specimens after corrosion. The results show that the crystallization process of the amorphous strip is divided into three steps, and the crystallization temperature is about 430470 鈩，
本文编号：2132300
[Abstract]:Amorphous ribbons of 57.5Ni-24.5Fe-14.5W-3.5B (wt%) were prepared by single roll quenching method and annealed at different temperatures. The crystallization behavior and evolution process of the amorphous ribbons were analyzed by DSC and XRD, the electrochemical corrosion behavior of the samples in 3.5 NaCl solution was studied by electrochemical polarization curve and electrochemical impedance method. SEM and EDS were used to analyze the microstructure and composition of the specimens after corrosion. The results show that the crystallization process of the amorphous strip is divided into three steps, and the crystallization temperature is about 430470 鈩，
本文编号：2132300
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