镁合金表面高温氧化膜CO<sub>2</sub>矿化处理研究

doi:10.11896/cldb.23040159

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Abstract The high temperature oxide film of the AZ80-0.38Nd (wt%) alloy was mineralized with CO₂ to improve its property. The morphology, microstructure and composition of the oxide film before and after CO₂ mineralization were observed and analyzed. The corrosion protection performance of the oxide film before and after CO₂ mineralization were investigated by immersion and electrochemical tests. The results showed that cracks and holes appeared on the high temperature oxide film of AZ80-0.38Nd alloy. While CO₂ mineralization treatment could eliminate cracks and holes, resulting in densification of the oxide film. The mineralized film consisted of rod-like MgCO₃·3H₂O and lamellar 4MgCO₃·Mg(OH)₂·4H₂O was constructed on the oxide film. Besides, compared with the oxide film, the mineralized film increased the corrosion potential (E_corr) of the alloy from -1.41 V_SCE to -1.33 V_SCE, and reduced the corrosion current density (i_corr) of the alloy from 1.62×10^-4 A/cm² to 2.47×10^-5 A/cm². In addition, the mineralized film can also transform the local corrosion of the alloy into uniform corrosion, showing excellent corrosion protection performance.

Key words： magnesium alloy high temperature oxidation carbon dioxide mineralization corrosion protection

Published: 25 August 2024 Online: 2024-09-10

CLC number:

TG178

Fund:Fundamental Research Funds for the Central Universities (2023QN1033), the Material Science and Engineering Discipline Guidance Fund of China University of Mining and Technology (CUMTMS202210).

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	CHENG Chunlong
	CHEN Zheng
	CHEN Changjiu
	LIU Lichen
	LE Qichi

Cite this article:

CHENG Chunlong,CHEN Zheng,CHEN Changjiu, et al. Research on CO₂ Mineralization of High Temperature Oxide Film on Magnesium Alloy Surface[J]. Materials Reports, 2024, 38(16): 23040159-6.

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http://www.mater-rep.com/EN/10.11896/cldb.23040159 OR http://www.mater-rep.com/EN/Y2024/V38/I16/23040159

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