Thermal Diffusion Preparation and Electrochemical Corrosion Behavior of Fe-Co Alloy Coatings on Surface of Mild Steel
摘 要
利用热扩渗方式,以Co3O4纳米粉体做钴源,在低碳钢表面制备了Fe-Co合金层。研究了处理温度对合金层表面状态和结构的影响,并在3.5% NaCl溶液中对合金层进行了腐蚀电化学研究。结果表明,处理温度高于800 ℃可在低碳钢表面形成厚度>25 μm,表面钴含量>20%,并与基底形成冶金结合的Fe-Co合金层,合金层为单一铁固溶体相。通过在低碳钢表面制备Fe-Co合金层可以明显改善其在3.5% NaCl溶液中的耐蚀性。
Abstract
Fe-Co alloy coatings were prepared on the surface of mild steel by means of thermal diffusion, using nano-Co3O4 powder as the source of Co element. The effects of treatment temperature on surface state, structure and corrosion resistance of the Fe-Co alloy coatings were investigated by electrochemical methods in 3.5% NaCl solution. The results show that when the treatment temperature≥800 ℃, single Fe solid solution phase Fe-Co alloy coatings(>25 μm) formed and the surface Co content(atomic fraction) was higher than 20at.%, and the coatings and substrate were integrated to metallurgy structure. The preparation of Fe-Co alloy coatings on mild steel surface can significantly improve the corrosion resistance in the 3.5% NaCl solution.
中图分类号 TG174,TB304
所属栏目 试验研究
基金项目 国家自然科学基金(51204115; 50615024); 新世纪优秀人才支持计划(NCET-07-0536)
收稿日期 2013/4/1
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备注盛敏奇,讲师,博士,
引用该论文: SHENG Min-qi,WAN Kang,ZHONG Qing-dong,XU Ji-fang,LV Chen-kai. Thermal Diffusion Preparation and Electrochemical Corrosion Behavior of Fe-Co Alloy Coatings on Surface of Mild Steel[J]. Corrosion & Protection, 2013, 34(10): 870
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【5】隗功益. 表面改性技术在H13钢上的应用[J]. 表面技术,2007,36(6):77-80.
【6】罗庆洪,李春志,娄艳芝,等. 磨削工艺对渗碳M50NiL钢表面变质层微观结构和性能及疲劳性能影响[J]. 金属学报,2012,48(2):194-198.
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【8】陈宗浩,韩文政,遇元宏,等. 中碳钢零件固体锌铝共渗技术研究[J]. 材料保护,2003,36(4):48-50.
【9】Chunhao Koo,Bai C Y,Luo Y J. The structure and high temperature corrosion behavior of pack aluminized coatings on superalloy IN-738LC[J]. Materials Chemistry and Physics,2004,86(2/3):258-268.
【10】Lin N M,Xie F Q,Yang H J,et al. Assessments on friction and wear behaviors of P110 steel and chromizing coating sliding against two counterparts under dry and wet conditions[J]. Applied Surface Science,2012,258(11):4960-4970.
【11】陶小克,董桂霞,彭日升,等. 固体法稀土硼钒共渗的研究[J]. 中国稀土学报,2001,19(2):178-181.
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【13】Robertson J. The mechanism of high temperature aqueous corrosion of stainless steels[J]. Corrosion Science,1991,32(4):443-465.
【14】Zhou Q Y,Jiang J B,Zhong Q D,et al. Preparation of Cu-Ni-Fe alloy coating and its evaluation on corrosion behavior in 3.5% NaCl solution[J]. Journal of Alloys and Compounds,2013,563:171-175.
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