DD90镍基单晶高温合金的电化学溶解行为研究

doi:10.11896/cldb.24060120

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Abstract With the development of the country's demand for environment and energy, the recycling of precious material has become important. The electrochemical dissolution ofalloy is the core part in the wet recovery process. This work focused on electrochemical dissolution of the nic-kel-based superalloy of DD90, which used the weight-loss method by electrochemical workstation in sulfuric acid. The cyclic voltammetry curve, linear voltammetry curve, dynamic potential polarization curve and electrochemical impedance spectrum (EIS) were investigated to explore the nature of electrochemical dissolution and polarization. The experiment determined that the optimal current density was 0.4 A/cm². In terms of energy consumption, a strange phenomenon was found. When the current density is between 0.2 A/cm² and 0.6 A/cm², the energy consumption of the system increases rapidly, and it begins to slow down under the current density from 0.6 A/cm² to 0.8 A/cm², while the current density exceeds 0.8 A/cm², it gradually increases because of the impurity ions discharge. In addition, the anode slime growth models were established here. The SEM pictures reveal that the anode slime is thin and dense in the high concentration electrolyte and thick, while it is loose in the low concentration electrolyte. Overall, the findings provide an efficient approach for the electrochemical recovery of waste nickel-based alloys, facilitating the reuse of valuable metals. It aligns with green and sustainable development needs, promotes economic resource circulation, and offers new insights for achieving controlled alloy dissolution and efficient resource recovery.

Key words： electrochemical dissolution single crystal superalloy energy consumption current density anode slime

Published: Online: 2025-08-28

CLC number:	TQ151
	TG146

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	Articles by authors
	QU Jiuhao
	LEI Kuan
	MA Qisheng
	ZHANG Yixin
	LIU Guiqun
	ZHANG Xiaoli

Cite this article:

QU Jiuhao,LEI Kuan,MA Qisheng, et al. Electrochemical Dissolution Behavior of the Nickel-based Superalloy of DD90[J]. Materials Reports, 2025, 39(17): 24060120-7.

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https://www.mater-rep.com/EN/10.11896/cldb.24060120 OR https://www.mater-rep.com/EN/Y2025/V39/I17/24060120

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