硅含量对铝硅热浸镀层耐高温氧化性能的影响
Effect of Silicon Content on High-temperature Oxidation Behavior of Hot-dip Al-Si Coatings
摘 要
采用光学显微镜(OM)、扫描电子显微镜(SEM)和能谱仪(EDS)分析了镀层加热过程中的组织变化及镀层的高温氧化性能，并对铝硅镀层的氧化机理进行了分析。结果表明，引起热浸镀铝(铝硅)镀层失效的主要原因是镀层中小孔的形成和生长，小孔形成于与基体接触的最内层合金层之间，随着加热时间的增长，小孔慢慢聚集成孔群，进而形成大的孔洞; 镀层高温氧化失效的直接原因是孔洞导致合金层产生微裂纹，氧气通过微裂纹贯穿合金层，使镀层丧失保护作用从而失效; 在850 ℃下，随着硅含量增高，合金层厚度变薄，更容易在合金层中产生微裂纹，抗高温氧化能力减弱。
硅含量
高温氧化
镀层失效机理
hot dip Al-Si coating
silicon content
high-temperature oxidation
coating failure mechanism
Abstract
The effect of silicon content on the high temperature oxidation resistance of Al-Si coatings at 850 ℃ in air was investigated. The initial structure and the structure evolution of the coatings during oxidation observed and analyzed by a combination of optical microscopy (OM), scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). The oxidation mechanism of Al-Si coatings was discussed. The results showed that the formation and growth of small voids led to the failure of coatings, these voids formed in the innermost layer contacting with the substrate. With the heating time increased, small voids gathered and finally turned into big holes. These holes caused micro cracks in the alloy layer, thus, air could get access to the inner layer and coatings lost its function. With the silicon increased, the thickness of alloy layer became thinner and thinner, which was easier to produce micro cracks in the alloy layer, and the high temperature oxidation resistance became weak at 850 ℃.
中图分类号 TG174.443
所属栏目 试验研究
基金项目
收稿日期 2013/11/7
修改稿日期
网络出版日期
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备注刘杰(1990-),硕士研究生,从事钢的热浸镀铝研究,
引用该论文: LIU Jie,LIU Xin,LI Jun,YANG Hong-lin,HU Wen-bin. Effect of Silicon Content on High-temperature Oxidation Behavior of Hot-dip Al-Si Coatings[J]. Corrosion & Protection, 2014, 35(9): 917
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参考文献
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【4】BAHSADUER A,MOHANTY O N. Structural studies of hot dip aluminized coatings on mild steel[J]. Materials Transactions,JIM 1991,32:1053-1061.
【5】EI-MALLHALLAWY N A,TAHA M A,SHADY M A,et al. Analysis of coating layer formed on steel strips during aluminizing by hot dipping in Al-Si baths[J]. Material Science Technology,1997,13:832-840.
【6】AKDENIZ M V,MEKHRABOV A O,YILMAZ T. The role of Si addition on the interfacial interaction in FeAl diffusion layer[J]. Scripta Metallurgica and Materialla,1994,33:1732-1738.
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【8】MOHAMMAD BADARUDDINA,HARNOWO SUPRIADIA EEWINB. Improvement of the high temperature oxidation of 1.10Cr 0.25Mo steel at 850 ℃ by hot-dip Al coating[J]. Procedia Engineering,2012,50:640-648.
【9】WANG D Q,SHI Z Y,TENG Y L. Microstructure and oxidation of hot-dip aluminized titanium at high temperature[J]. Applied Surface Science,2005,250:238-246.
【10】WANG Y S,XIONG J,YAN J,et al. Oxidation resistance and corrosion behavior of hot-dip aluminized coatings on commercial-purity titanium[J]. Surface & Coatings Technology,2011,206:1277-1282.
【11】GAUTHIER V,DETTENWANGER F,SCHTZE M. Oxidation-resistant aluminide coatings on γ-TiAl[J]. Oxidation of Metals,2003,59:233-255.
【12】WANG C J,CHEN S M. The high-temperature oxidation behavior of hot-dipping Al-Si coating on low carbon steel[J]. Surface & Coatings Technology,2006,200:6601-6605.
【13】WANG C J,CHEN SM. Microstructure and cyclic oxidation behavior of hot dip aluminized coating on Ni-base superalloy Inconel 718[J]. Surface & Coatings Technology,2006,201:3862-3866.
【14】WANG C J,BADARUDDIN M. The dependence of high temperature resistance of aluminized steel exposed to water-vapour oxidation[J]. Surface & Coatings Technology,2010,205:1200-1205.
【15】CHENG W J,WANG C J. EBSD characterization of high-temperature phase transformations in an Al-Si coating on Cr-Mo steel[J]. Materials Characterization,2012,64:15-20.
【16】BEDFORD G M, BEDFORD J. Formation of intermetallic compounds in aluminium-coated steel strip produced by the Elphal process[J]. Materials technology,1974,1(1):233-240.
【17】YEREMENKO V N,NATANZON Y V,DYBKOV V I. The effect of dissolution on the growth of the FE2Al5 interla yer in the solid iron-liquid aluminium system[J]. Materials Science,1981,16(7):1748-1756.
【18】郑毅然,高文禄,原国生. 热浸镀铝钢的合金层抗高温氧化机理[J]. 东北大学学报:自然科学版,1998,19(1):26-28.
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