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中国腐蚀与防护学报  2018, Vol. 38 Issue (4): 365-372    DOI: 10.11902/1005.4537.2017.073
  研究报告 本期目录 | 过刊浏览 |
N5镍基单晶高温合金在王水中的电化学溶解行为研究
宋增意, 刘莉, 邓丽, 孙元, 周亦胄()
中国科学院金属研究所 沈阳 110016
Electrochemical Dissolution Behavior of N5 Nickel-based Single Crystal Superalloy in Aqua Regia Electrolyte
Zengyi SONG, Li LIU, Li DENG, Yuan SUN, Yizhou ZHOU()
Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
全文: PDF(5950 KB)   HTML
摘要: 

选用王水为电解液,通过动电位极化曲线、电化学阻抗、恒电流密度、恒电压电解实验研究N5镍基单品高温合金在王水中的电化学行为,采用SEM,EDS,EPMA和XRD等表征手段分析阳极产物的成分和形貌。结果表明,在电解过程中合金表面有两层明显的覆盖层,具有疏松结构的外层主要为Ta、W的氧化物和碳化物,内层为残留金属基体和金属氧化物组成的具有多孔结构的富Cr氧化层,电解后合金阳极反应由活化控制转变为扩散控制。本文阐明高温合金在王水中的电化学溶解行为,建立合金溶解模型。结果表明,表面阳极产物堆积产生的扩散阻力是电解阻力增加的主要原因,及时去除表面阳极产物能使合金电解速率提高近100%。

关键词 高温合金王水电化学溶解极化曲线阳极产物    
Abstract

The wet recovery efficiency of superalloy directly depends on its dissolution rate, therefore,the electrochemical dissolution behavior of a Ni-based superalloy N5 in aqua regia was studied by means of potentiondynamic polarization measurement and electrochemical impedance spectroscopy (EIS), as well as galvanostatic- and potentiostaic-electrolysis. While the surface morphology and dissolution products of the treated alloy were characterized by means of SEM, EDS, EPMA and XRD. It was found that during electrolysis a two layered corrosion product formed on the alloy surface, which consisted of an outer layer with loose deposition of oxides and carbides of Ta and W and an inner porous layer consisted of residual matrix and Cr-rich oxides. A qualitative model has been assumed to illustrate the electrochemical dissolution behavior. It follows that the diffusion barrier effect induced by corrosion products on the anode is the main cause responsible for the increase of the electrolytic resistance, hence, stripping off the corrosion products in time can increase the dissolution rate of the superalloy by ca 100%.

Key wordssuperalloy    aqua regia electrolyte    electrochemical dissolution    polarization curve    oxidation product
收稿日期: 2017-05-06     
ZTFLH:  TG113.23  
基金资助:国家自然科学基金 (51271186)
作者简介:

作者简介 宋增意,男,1992年生,硕士生

引用本文:

宋增意, 刘莉, 邓丽, 孙元, 周亦胄. N5镍基单晶高温合金在王水中的电化学溶解行为研究[J]. 中国腐蚀与防护学报, 2018, 38(4): 365-372.
Zengyi SONG, Li LIU, Li DENG, Yuan SUN, Yizhou ZHOU. Electrochemical Dissolution Behavior of N5 Nickel-based Single Crystal Superalloy in Aqua Regia Electrolyte. Journal of Chinese Society for Corrosion and protection, 2018, 38(4): 365-372.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2017.073      或      https://www.jcscp.org/CN/Y2018/V38/I4/365

图1  N5合金在王水电解液中的电解速率和电流效率随电流密度的变化曲线
图2  N5合金在王水中的电化学溶解曲线
图3  N5合金不同时间电溶解后的表面形貌
Element Mass fraction / % Atomic fraction / %
Al K 1.45 2.73
Cr K 6.34 6.21
Co K 4.85 4.19
Ni K 15.90 13.78
Mo L 2.43 1.29
Ta M 35.93 10.11
W M 15.03 4.16
表1  N5合金电解120 s的阳极产物成分分析结果
图5  N5合金在王水中电解后横截面的电子探针分析结果
图6  N5合金电溶解后内部的微观组织形貌
图7  N5合金所含各种纯金属元素在王水中的阳极极化曲线
图8  N5合金在王水中电解前后的电化学阻抗谱
图9  N5合金在恒电位1.554 V下电解1800 s过程中电流密度随时间的变化
图10  N5合金恒电流密度0.1 A/cm2电解3600 s过程中电压随时间变化曲线
图11  N5合金在王水中恒电流密度下电化学溶解过程的图解说明
图4  N5合金电溶解阳极产物的XRD分析结果
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