基于碱热预处理溶液调控的AZ31镁合金钙磷耐蚀涂层

doi:10.11896/cldb.25020186

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Abstract To enhance the corrosion resistance of magnesium alloys, AZ31 magnesium alloy was used as the test substrate, and a two-step method was employed to prepare a calcium-phosphate coating with a micro-nano structure on its surface. First, hydrothermal reactions were conducted using Na₂CO₃, NaOH, and NaHCO₃ as alkali hydrothermal solutions to obtain the pretreatment coatings. Subsequently, the pretreated magne-sium alloy was placed in a mixed solution of EDTA-2NaCa and KH₂PO₄ for another hydrothermal reaction to prepare the CaP coating. The study focuses on the influence of rules and principles of alkaline solutions in the first-step alkali heat treatment on the CaP film layer. The results show that after the two-step treatment, a CaP film layer can be formed on the surface of AZ31 magnesium alloy. However, the composition, microstructure, and corrosion resistance of the film vary significantly due to the influence of the composition and pH value of the alkaline heat solutions. The pretreatment with NaOH forms a dense Mg(OH)₂ pretreatment film, which promotes the formation of a subsequent dense hydroxyapatite (HA) layer, resulting in the best corrosion resistance. The corrosion potential (E_corr) shifts positively by ~1.5 V compared to that of AZ31 magnesium alloy, and the corrosion current density (I_corr) decreases by 5 orders of magnitude. The pretreatment with Na₂CO₃ gene-rates a porous film containing Mg(OH)₂ and MgCO₃. Although the subsequent CaP film layer is mainly composed of HA, its compactness decreases, and its corrosion resistance is inferior. The pretreatment with NaHCO₃ produces a loose film with a complex composition and structure, causing the subsequent CaP film to contain more magnesium calcium phosphate. The crystals are irregular, with large pores, and the corrosion resistance is the worst.

Key words： magnesium alloy calcium phosphate coating alkaline-thermal pretreatment corrosion resistance hydrothermal method

Published: 25 February 2026 Online: 2026-02-13

CLC number:

TG 174.4

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	Articles by authors
	FU Hailuo
	ZHU Chenghao
	WEI Dali
	LIU Shuyang
	JIAO Yihan
	ZHOU Rui
	LIN Qing
	WANG Jianquan

Cite this article:

FU Hailuo,ZHU Chenghao,WEI Dali, et al. CaP Corrosion-resistant Coatings on AZ31 Magnesium Alloy Regulated by Alkaline-thermal Pretreatment Solutions[J]. Materials Reports, 2026, 40(4): 25020186-7.

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https://www.mater-rep.com/EN/10.11896/cldb.25020186 OR https://www.mater-rep.com/EN/Y2026/V40/I4/25020186

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