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Influence of pH on the Formation, Composition and Protectiveness of Fluoride Conversion Film Deposited on AZ31 Magnesium Alloy in KF Solution

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Acta Metallurgica Sinica (English Letters) Aims and scope

Abstract

In deaerated 0.1 M KF solution at pH 5, pH 7.5 and pH 9, fluoride films were deposited on AZ31 magnesium (Mg) alloy at − 1.4 V vs saturated calomel electrode (SCE). The morphology, phase composition, elemental and compositional depth distribution of different fluoride films and their influences on the corrosion resistance of AZ31 Mg alloy were explored in detail. The results indicated that the films deposited at weak acidic and nearly neutral pH consisted of two layers with amorphous Mg(OH)2 and MgF2 as the inner layer, and Mg(OH)2, MgF2 and KMgF3 crystals the outer layer. The film deposited at alkaline pH was a monolayer structure consisting of amorphous Mg(OH)2 as the major constitute and MgF2 as the minor constitute. The protectiveness of fluoride film was intimately related to its composition and structure. The content and crystal regularity of KMgF3 were the two main factors influencing the protectiveness of fluoride film. The fluoride film deposited at pH 7.5 offered the best protection to AZ31 Mg alloy.

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Acknowledgements

This work was finically supported by the National Natural Science Foundation of China (No. 51701221), the Major R&D Project of Liaoning province (2020JH1/10100001), the State Key laboratory of Metal Material for Marine Equipment and Application (No. SKLMEA-K201907) and Youth Innovation Promotion Association of the Chinese Academy of Sciences (No. 2019193, KGFZD-135-19-02).

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Authors and Affiliations

  1. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, China

    Liping Wu, Chen Liu, Jie Wei, Junhua Dong, Lin Zhao, Chao Li, Wei Ke & Changgang Wang

  2. State Key Laboratory of Metal Material for Marine Equipment and Application, Anshan, 114009, China

    Yiqing Chen

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  1. Liping Wu
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  2. Chen Liu
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  3. Jie Wei
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  4. Junhua Dong
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  5. Lin Zhao
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  6. Chao Li
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  7. Wei Ke
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  8. Yiqing Chen
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  9. Changgang Wang
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Correspondence to Junhua Dong or Changgang Wang.

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Wu, L., Liu, C., Wei, J. et al. Influence of pH on the Formation, Composition and Protectiveness of Fluoride Conversion Film Deposited on AZ31 Magnesium Alloy in KF Solution. Acta Metall. Sin. (Engl. Lett.) 36, 1397–1408 (2023). https://doi.org/10.1007/s40195-023-01571-2

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