摘要
采用圆盘旋转技术,研究了锌液流速对Fe-B合金耐锌液冲蚀性能和冲蚀界面形貌的影响。在锌液温度和冲蚀角度一定时,随锌液冲蚀速度的增加,与316L不锈钢相比,Fe-3.5B(质量分数,%)合金的冲刷腐蚀率呈现较为缓慢的线性增加趋势,表现出低的锌液冲蚀率。在较低的锌液冲蚀速度下,Fe-B合金的冲蚀率仅为316L不锈钢的1/3,传质过程主要通过锌液在Fe2B网状间隙中的物理流动而进行;而在较高的锌液冲蚀速度下,Fe-B合金的冲蚀率远低于不锈钢,表现出更优异的抗锌液冲蚀性能,此时的传质方式主要是铁、锌原子在界面前沿直接的扩散反应。界面形貌分析表明,Fe-B合金良好的抗锌液冲蚀性能得益于冲蚀初期基体快速腐蚀所产生的界面前沿裸露、密集Fe2B抗蚀骨架对流动锌液良好的隔离、阻挡效应。
Effects of liquid zinc erosion velocity on erosion-corrosion performance and interfacial morphologies of Fe-B alloy with 3 .5%B in flowing liquid zinc bath have been investigated by using the rotating-disc technique.The results show that the erosion rate of Fe-B alloy in flowing liquid zinc bath linearly increases very slowly with the increase of erosion velocity of liquid zinc at cer-tain bath temperature and flowing liquid zinc erosion angle compared with 316L stainless steel.In initial small erosion-velocity state,the erosion rate of Fe-B alloy in flowing liquid zinc is one third of erosion rate for that of 316L stainless due to the flowing state of liquid zinc among Fe2 B skeleton of Fe-B alloy,while the high erosion velocity of liquid zinc results in a rapid interfacial re-action of iron matrix of Fe-B alloy and liquid zinc,which leads to the bigger differences of erosion rate between Fe-B alloy and 316L stainless steel in flowing liquid zinc.Interfacial morphology analysis indicates that the better erosion-corrosion performance of Fe-B alloy in flowing liquid zinc could be attributed to the barrier effect of dense netlike Fe2 B skeleton overlaid at the erosion in-terface formed from fast reaction of iron matrix of Fe-B alloy and liquid zinc at the initial liquid zinc erosion-corrosion stage.
出处
《中国科技论文》
CAS
北大核心
2014年第2期178-182,共5页
China Sciencepaper
基金
国家自然科学基金资助项目(51301128
51271142)
高等学校博士学科点专项科研基金资助项目(20120201120005
20110201130008)
中国博士后科学基金资助项目(2012M521767
2013T60875)
关键词
铁硼合金
锌
流速
冲蚀
界面
形貌
iron boron alloys
zinc
flow velocity
erosion
interfaces
morphology
