CAJ | 학술논문

采用单辊急冷法制备Ni 42.2 W 19.2 Fe 18.9 B 19.7 (摩尔分数,%)非晶合金.采用差热分析仪(DSC)和X射线衍射(XRD)分析非晶薄带的特征温度和析出相;采用电化学极化曲线及电化学阻抗法研究不同温度退火样品在 3.5% NaCl(质量分数)溶液中的电化学腐蚀行为;采用扫描电镜(SEM)分析试样腐蚀后表面显微形貌,并采用能谱分析仪(EDS)和微区衍射仪分析表面成分.结果表明:使用单辊急冷法可以制备Ni 42.2 W 19.2 Fe 18.9 B 19.7非晶合金,其玻璃转化温度为627 ℃,晶化温度为692 ℃.650 ℃退火试样的抗腐蚀性能优于750 ℃退火试样和非晶薄带的.在 650℃退火试样表面形成致密钝化膜,因此具有良好的抗腐蚀性能;而在非晶薄带和750℃退火试样表面形成的钝化膜不稳定,易发生点蚀和局部腐蚀.
채용단곤급랭법제비Ni 42.2 W 19.2 Fe 18.9 B 19.7 (마이분수,%)비정합금.채용차열분석의(DSC)화X사선연사(XRD)분석비정박대적특정온도화석출상;채용전화학겁화곡선급전화학조항법연구불동온도퇴화양품재 3.5% NaCl(질량분수)용액중적전화학부식행위;채용소묘전경(SEM)분석시양부식후표면현미형모,병채용능보분석의(EDS)화미구연사의분석표면성분.결과표명:사용단곤급랭법가이제비Ni 42.2 W 19.2 Fe 18.9 B 19.7비정합금,기파리전화온도위627 ℃,정화온도위692 ℃.650 ℃퇴화시양적항부식성능우우750 ℃퇴화시양화비정박대적.재 650℃퇴화시양표면형성치밀둔화막,인차구유량호적항부식성능;이재비정박대화750℃퇴화시양표면형성적둔화막불은정,역발생점식화국부부식.
Ni42.2W19.2Fe18.9B19.7 (mole fraction, %) amorphous alloy was prepared by melt spinning method. The characteristic temperatures and precipitated phases of amorphous alloy were identified by differential scanning calorimeter (DSC) and X-ray diffractometer (XRD). The electrochemical corrosion behaviors of the samples in 3.5% NaCl (mass fraction) solution was studied by the linear polarization method and electrochemical impedance spectroscopy. The morphologies and components of samples after potentiodynamic polarization were observed and analyzed by scanning electron microscope (SEM), energy dispersive spectrometer (EDS) and micro-zone X-ray diffractometer, respectively. The result shows that the Ni42.2W19.2Fe18.9B19.7 amorphous alloy could be prepared by melt spinning method. The glass transition temperature and crystallization temperature are about 627 and 692℃, respectively. Compared with as-spun sample and the sample annealed at 750℃, the anticorrosion property of the sample annealed at 650℃ is obviously improved. A stable passive film forms on the surface of sample annealed at 650℃, which leads to its excellent corrosion resistance. However, the passive films on the surfaces of the amorphous alloy and the sample annealed at 750℃ are not stable, which are susceptible to be attacked by pitting corrosion and localized corrosion.