Electrochemical Dissolution Behavior of N5 Nickel-based Single Crystal Superalloy in Aqua Regia Electrolyte

doi:10.11902/1005.4537.2017.073

Journal of Chinese Society for Corrosion and protection

2018, Vol. 38

Issue (4): 365-372 DOI: 10.11902/1005.4537.2017.073

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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

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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 words: superalloy aqua regia electrolyte electrochemical dissolution polarization curve oxidation product

Received: 06 May 2017

ZTFLH:

TG113.23

Fund: Supported by National Natural Science Foundation of China (51271186)

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Cite this article:

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.

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https://www.jcscp.org/EN/10.11902/1005.4537.2017.073 OR https://www.jcscp.org/EN/Y2018/V38/I4/365

Fig.1 Dependences of total dissolution rate and current efficiency on current density

Fig.2 Electrochemical dissolution curves of N5 alloy in aqua regia electrolyte: (a) polarization curve; (b) E-i curve

Fig.3 Surface morphologies of N5 alloy after electrolyzed for 120 s (a), 600 s (b), 1800 s (c) and 3000 s (d)

Table 1 Chemical composition of anode products formed on N5 superalloy during electrolysis for 120 s

Fig.5 EPMA element mappings on the cross section of N5 alloy after 3000 s electrolysis in aqua regia electrolyte (unit: %)

Fig.6 Microstructure of the interior of electrolyzed N5alloy

Fig.7 Polarization curves of various pure metal elements contained in N5 alloy in aqua regia electrolyte

Fig.8 Bode (a) and Nyquist (b) plots of N5 alloy in aqua regia electrolyte

Fig.9 I-t curves for N5 superalloy during 1800 s electrolysis in aqua regia electrolyte at 1.554 V

Fig.10 E-t curve for N5 superalloy during 3600 s electrolysis in aqua regia electrolyte at 0.1 A/cm² for 3600 s

Fig.11 Schematic diagram showing the electrochemical dissolution behavior of N5 alloy in aqua regia electrolyte: (a) oxide film formed in air, (b) anode product formed on the surface, (c) the film of anode and Cr rich phase formed on the surface, (d) the final reactant formed on the surface

Fig.4 XRD patterns of anode products of N5 superalloy

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