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材料工程  2015, Vol. 43 Issue (11): 44-49    DOI: 10.11868/j.issn.1001-4381.2015.11.008
  测试与表征 本期目录 | 过刊浏览 | 高级检索 |
NiAl/AlBN封严涂层的电偶腐蚀行为
孙杰, 石超, 赵丹
沈阳理工大学环境与化工学院, 沈阳 110159
Galvanic Corrosion Behavior of NiAl/AlBN Seal Coating
SUN Jie, SHI Chao, ZHAO Dan
School of Environmental and Chemical Engineering, Shenyang Ligong University, Shenyang 110159, China
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摘要 采用空气等离子喷涂工艺制备了NiAl/AlBN封严涂层。研究了NiAl/AlBN涂层在5%(质量分数)NaCl溶液中的电偶腐蚀行为。结合极化曲线、开路电位和微观形貌(SEM)观察,对封严涂层的腐蚀机理进行了探讨。通过计算出的平均电偶电流密度,评价了NiAl/AlBN封严涂层的电偶腐蚀敏感性。结果表明,AlBN涂层的腐蚀电位较NiAl涂层低,两者相差约70mV,电偶腐蚀过程中,腐蚀电位较低的AlBN涂层作为电偶对的阳极发生腐蚀,NiAl涂层作为阴极得到保护。NiAl/AlBN涂层的电偶电流密度为3.5331μA/cm2。电偶腐蚀后,电偶对的阳极、阴极的自腐蚀电位均降低了,阳极电位从-808mV负移到-883mV,阴极电位从-740mV负移到-800mV;电偶电位为-814mV。随着腐蚀时间的延长,AlBN涂层的防护性能逐渐减弱。
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孙杰
石超
赵丹
关键词 AlBN封严涂层NiAl封严涂层电偶腐蚀    
Abstract:NiAl/AlBN seal coatings were prepared by air plasma spraying method on the superalloy substrate. The galvanic corrosion behavior of AlBN top coating and NiAl bond coating was investigated in 5%(mass fraction) NaCl solution. The scanning electron microscopy(SEM), polarization curve, and open circuit potential, were used to characterize the morphology and the corrosion behavior of the as-sprayed coating. The average galvanic current density was calculated to evaluate the galvanic corrosion sensitivity of AlBN and NiAl seal coating. The results show that the corrosion potential of AlBN coating of is about 70mV lower than that of NiAl coating. In the process of galvanic corrosion,AlBN seal coating with the lower corrosion potential is served as an anode, the NiAl coating is protected as a cathode. The galvanic current density of NiAl/AlBN coating is 3.5331μA/cm2. After the galvanic corrosion, the corrosion potentials of the anode and cathode are decreased from -808mV to -883mV(SCE) and -740mV to -800mV(SCE) respectively. The galvanic potential is -814mV(SCE). The protection performance of the coating is decreased gradually with the extension of corrosion time.
Key wordsAlBN seal coating    NiAl seal coating    galvanic corrosion
收稿日期: 2014-11-28      出版日期: 2015-11-26
中图分类号:  TG174.3  
通讯作者: 孙杰(1971-),男,教授,博士,研究方向:金属的腐蚀与防护研究,联系地址:辽宁省沈阳市浑南新区南屏中路6号沈阳理工大学环境与化工学院(110159),jiersun2000@126.com     E-mail: jiersun2000@126.com
引用本文:   
孙杰, 石超, 赵丹. NiAl/AlBN封严涂层的电偶腐蚀行为[J]. 材料工程, 2015, 43(11): 44-49.
SUN Jie, SHI Chao, ZHAO Dan. Galvanic Corrosion Behavior of NiAl/AlBN Seal Coating. Journal of Materials Engineering, 2015, 43(11): 44-49.
链接本文:  
http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2015.11.008      或      http://jme.biam.ac.cn/CN/Y2015/V43/I11/44
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