铝电解阳极用磷铸铁热膨胀、高温抗氧化及耐蚀性能的研究
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摘要
研究了磷含量(0.49%~1.92%,质量分数)对铝电解阳极用磷铸铁热膨胀性能、高温抗氧化性能及耐腐蚀性能的影响。结果表明:经800℃×24 h退火后,随着磷含量的增加,磷铸铁的平均热膨胀系数逐渐减小,20~800℃平均热膨胀系数为(13.47~14.42)×10~(-6)K~(-1);高温氧化增重先升高后降低,800℃氧化60 h后,磷铸铁表面出现不同程度的氧化皮脱落现象,氧化100 h后,氧化增重为0.14~0.22 mg/mm~2;随磷含量的增加,腐蚀电流密度逐渐增加,腐蚀电位逐渐降低,耐腐蚀性能降低。
The effects of phosphor content(0.49wt.%-1.92wt.%)on the thermal expansivity,high-temperature oxidation resistance,and corrosion resistance of phosphorus cast iron for the anode of aluminum electrolytic were studied in this paper.The results show that the average thermal expansion coefficient of phosphorus cast iron heated at 800℃for 24 h is(13.47-14.42)×10~(-6)K~(-1)and decreases gradually with increasing the content of P.The oxidation weight increases initially,and then declines,and the oxide skin on the samples fell off to various degree after being oxidized at 800℃for 60 h.The weight increment per unit area is in the range of 0.14 mg/mm~2to 0.22 mg/mm~2after being oxidized for 100 h.The corrosion current density increases and the corrosion potential decreases,so the corrosion resistance reduces with the increase of P content.
The effects of phosphor content(0.49wt.%-1.92wt.%)on the thermal expansivity,high-temperature oxidation resistance,and corrosion resistance of phosphorus cast iron for the anode of aluminum electrolytic were studied in this paper.The results show that the average thermal expansion coefficient of phosphorus cast iron heated at 800℃for 24 h is(13.47-14.42)×10~(-6)K~(-1)and decreases gradually with increasing the content of P.The oxidation weight increases initially,and then declines,and the oxide skin on the samples fell off to various degree after being oxidized at 800℃for 60 h.The weight increment per unit area is in the range of 0.14 mg/mm~2to 0.22 mg/mm~2after being oxidized for 100 h.The corrosion current density increases and the corrosion potential decreases,so the corrosion resistance reduces with the increase of P content.
引文
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[2]李建芸.灰铸铁含磷星对耐磨性的影响[J].机械管理开发,2005(1):21-22.
[3]任颂赞,张静江,陈质如,等.钢铁金相图谱[M].上海:上海科学技术文献出版社,2003.
[4]张报清,雷霆,余宇楠.预焙槽阳极压降影响因素研究[J].矿冶,2015(1):50-53.
[5]梁玉冬,王力军,牛婷婷.基于线性规划算法的磷生铁最优化成分设计[J].有色金属,2017(7):35-40.
[6]张思源,胡俊杰,李贺松,等.电解铝生产中磷生铁配方优化模型及试验[J].金属材料与冶金工程,2014,4(2):31-35.
[7]李东,谢刚,姚云,等.铝工业阳极钢爪腐蚀机理及其防腐[J].轻金属,2014(2):34-40.
[8]韩成府,路王珂,孙玉福,等.磷对铝电解阳极用磷铸铁组织及性能的影响[J].铸造,2017,66(6):613-617.
[9]Abbasi H R,Bazdar M,Halvaee A.Effect of phosphorus as an alloying element on microstructure and mechanical properties of pearlitic gray cast iron[J].Materials Science and Engineering A,2007,444(1-2):314-317.
[10]黄良余,陆文华,李隆盛.铸造合金及其熔炼[M].北京:机械工业出版社,2012:8-51.
[11]任颂赞,张静江,陈质如,等.钢铁金相图谱[M].上海:上海科学技术文献出版社,2003:465-481.
[12]闫永生,孙小亮,朱洪波,等.Nb对灰铸铁相变温度的影响[J].现代铸铁,2011(2):42-44.
[13]黄小全,杨相寿.SG变质剂提高灰铸铁的热物理性能[J].铸造,1991(12):13-17.
[14]刘祥.铸造合金力学及物理性能[M].北京:机械工业出版社,1982:319-344.
[15]卢月美,李树江,林访辉,等.含Pb、As、Sn D型石墨铸铁抗氧化性能的研究[J].现代铸铁,2002(4):13-16.
[16]唐庆新,刘靖,韩静涛.奥氏体耐热不锈钢309S高温抗氧化性能研究[J].钢铁研究学报,2009,21(10):43-47.
[17]Vladimir V,Basabe,Jerzy A,et al.Growth rate and phase composition of oxide scales during hot rolling of low carbon steel[J].ISIJ International,2004,44(9):1554.
[18]周文倩,李静,孙玉福.钼对CADI组织和磨损及电化学腐蚀性能的影响[J].铸造,2016,65(9):895-898;902.
[19]申泽骥,苏贵桥.铸铁的电化学腐蚀机理[J].现代铸铁,2002(1):13-16.
[20]师素粉.铸铁材料在水环境(海水、淡水、盐水)中的腐蚀研究[D].太原:太原科技大学,2008.
[21]季德霖.铸铁的腐蚀破坏及控制[J].安徽科技,1997(4):43-45.