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A two−step approach to form KMgF3 on AZ31 magnesium alloy: growth and protectiveness mechanism

IF 5.7 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Research Bulletin Pub Date : 2025-08-15 DOI:10.1016/j.materresbull.2025.113727

Li-Ping Wu

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引用次数: 0

Abstract

A KMgF₃ film was fabricated on AZ31 Mg alloy using a two−step approach−first forming a MgF₂ film by immersion in 0.1 mol·dm^-3 NH₄F solution with pH 7, and then growing KMgF₃ by soaking in 1 mol·dm^-3 KF solution with pH 7. The growth of KMgF₃ was investigated by analyzing its morphological, structural and compositional evolution. The corrosion resistance of the MgF₂ and KMgF₃ coated AZ31 Mg alloy was compared in 3.5 % NaCl solution with pH 7. The results showed that KMgF₃ grew in an ingrowth mode through KF diffusion into MgF₂ film. The formation of KMgF₃ blocked the diffusion of KF, inducing a decrease in the content and the formation rate of KMgF₃ with immersion time. KMgF₃ respectively reduced corrosion current density of AZ31 Mg alloy and the MgF₂ film coated AZ31 Mg alloy by 20 times and 18 times, due to chemical stability of KMgF₃ in NaCl solution.

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两步法在AZ31镁合金上形成KMgF3：生长和保护机制

采用两步法在AZ31镁合金上制备了KMgF3薄膜，首先在pH为7的0.1 mol·dm-3 NH4F溶液中浸泡形成MgF2薄膜，然后在pH为7的1 mol·dm-3 KF溶液中浸泡生长KMgF3。通过分析KMgF3的形态、结构和成分演变来研究其生长。比较了MgF2和KMgF3包覆AZ31镁合金在pH为7的3.5% NaCl溶液中的耐蚀性。结果表明，KMgF3通过KF扩散到MgF2薄膜中，以向内生长的方式生长。KMgF3的形成阻断了KF的扩散，导致KMgF3的含量和形成速率随浸泡时间的增加而降低。由于KMgF3在NaCl溶液中的化学稳定性，KMgF3分别使AZ31镁合金的腐蚀电流密度降低了20倍和18倍。

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来源期刊

Materials Research Bulletin

Materials Research Bulletin 工程技术-材料科学：综合

CiteScore

9.80

自引率

5.60%

发文量

372

审稿时长

42 days

期刊介绍： Materials Research Bulletin is an international journal reporting high-impact research on processing-structure-property relationships in functional materials and nanomaterials with interesting electronic, magnetic, optical, thermal, mechanical or catalytic properties. Papers purely on thermodynamics or theoretical calculations (e.g., density functional theory) do not fall within the scope of the journal unless they also demonstrate a clear link to physical properties. Topics covered include functional materials (e.g., dielectrics, pyroelectrics, piezoelectrics, ferroelectrics, relaxors, thermoelectrics, etc.); electrochemistry and solid-state ionics (e.g., photovoltaics, batteries, sensors, and fuel cells); nanomaterials, graphene, and nanocomposites; luminescence and photocatalysis; crystal-structure and defect-structure analysis; novel electronics; non-crystalline solids; flexible electronics; protein-material interactions; and polymeric ion-exchange membranes.

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