晶化行为对Fe基块体非晶合金的腐蚀性能的影响
Effect of crystalline behavior on corrosion resistance of Fe-based bulk amorphous alloy
陈庆军，余慧燕，周贤良，华小珍
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作者单位：南昌航空大学材料科学与工程学院
中文关键字：非晶/纳米晶合金； 热处理； 耐蚀性
英文关键字：amorphous/nano-crystalline alloy; heat treatment; corrosion resistance
中文摘要：摘要：采用电化学极化曲线和交流阻抗技术研究了Fe41Co7Cr15Mo14C15B6Y2非晶及其非晶/纳米晶合金在1.5M HCl溶液中的腐蚀行为。利用X射线衍射仪（XRD）、示差扫描量热计（DSC）和扫描电镜（SEM）对非晶及其非晶/纳米晶合金的相组成、晶化过程及腐蚀形貌进行了分析；结果表明，Fe41Co7Cr15Mo14C15B6Y2非晶合金具有最佳的耐蚀性能，虽然部分晶化的Fe41Co7Cr15Mo14C15B6Y2 非晶合金抗腐蚀性能有所降低并具有差异性，但是自腐蚀电流密度Icorr以及钝化膜电阻R1依然与其非晶试样的数据在同一个数量级，说明其抗腐蚀性能下降并不是十分明显。
英文摘要：Abstract: Amorphous alloy Fe41Co7Cr15Mo14C15B6Y2 were prepared by vacuum arc melting method, and nano-crystalline Fe41Co7Cr15Mo14C15B6Y2 alloys were obtained by different annealing technique. The corrosion resistance investigation of nano-crystalline Fe41Co7Cr15Mo14C15B6Y2 alloys compared to its counterpart amorphous alloys in 1.5M HCl solution were carried out by the potentiodynamic polarization method and the electrochemical impedance spectroscopy (EIS) technique, respectively. The crystallization processes of samples were identified by X-ray diffraction and differential scanning calorimeter. The morphologies of the samples after potentiodynamic polarization were observed by SEM. The results show that amorphous alloy has a higher corrosion resistance than that of the counterpart nano-crystalline alloys, but value of Icorr and R1 of nano-crystalline alloys is same order of magnitude as amorphous alloy, which mean the decline rate of corrosion resistance of nano-crystalline alloys is not very obvious.