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

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Title: A two−step approach to form KMgF3 on AZ31 magnesium alloy: growth and protectiveness mechanism.
Authors: Wu, Li-Ping1 (AUTHOR) wuliping2008@126.com
Source: Materials Research Bulletin. Feb2026, Vol. 194, pN.PAG-N.PAG. 1p.
Subjects: Corrosion resistance, Protective coatings, Magnesium fluoride, Fabrication (Manufacturing), Saline solutions, Magnesium alloys
Abstract: • The KMgF 3 film displayed an ingrowth model. • The formation of KMgF 3 limited its further growth. • KMgF 3 reduced corrosion current density of AZ31 Mg alloy by 20 times. • KMgF 3 was protective due to its stability in NaCl solution. A KMgF 3 film was fabricated on AZ31 Mg alloy using a two−step approach−first forming a MgF 2 film by immersion in 0.1 mol·dm-3 NH 4 F solution with pH 7, and then growing KMgF 3 by soaking in 1 mol·dm-3 KF solution with pH 7. The growth of KMgF 3 was investigated by analyzing its morphological, structural and compositional evolution. The corrosion resistance of the MgF 2 and KMgF 3 coated AZ31 Mg alloy was compared in 3.5 % NaCl solution with pH 7. The results showed that KMgF 3 grew in an ingrowth mode through KF diffusion into MgF 2 film. The formation of KMgF 3 blocked the diffusion of KF, inducing a decrease in the content and the formation rate of KMgF 3 with immersion time. KMgF 3 respectively reduced corrosion current density of AZ31 Mg alloy and the MgF 2 film coated AZ31 Mg alloy by 20 times and 18 times, due to chemical stability of KMgF 3 in NaCl solution. [Display omitted] [ABSTRACT FROM AUTHOR]
Copyright of Materials Research Bulletin is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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DbLabel: Engineering Source
An: 188573684
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  Label: Title
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  Data: A two−step approach to form KMgF3 on AZ31 magnesium alloy: growth and protectiveness mechanism.
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  Data: <searchLink fieldCode="AR" term="%22Wu%2C+Li-Ping%22">Wu, Li-Ping</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> wuliping2008@126.com</i>
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  Data: <searchLink fieldCode="JN" term="%22Materials+Research+Bulletin%22">Materials Research Bulletin</searchLink>. Feb2026, Vol. 194, pN.PAG-N.PAG. 1p.
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  Data: <searchLink fieldCode="DE" term="%22Corrosion+resistance%22">Corrosion resistance</searchLink><br /><searchLink fieldCode="DE" term="%22Protective+coatings%22">Protective coatings</searchLink><br /><searchLink fieldCode="DE" term="%22Magnesium+fluoride%22">Magnesium fluoride</searchLink><br /><searchLink fieldCode="DE" term="%22Fabrication+%28Manufacturing%29%22">Fabrication (Manufacturing)</searchLink><br /><searchLink fieldCode="DE" term="%22Saline+solutions%22">Saline solutions</searchLink><br /><searchLink fieldCode="DE" term="%22Magnesium+alloys%22">Magnesium alloys</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: • The KMgF 3 film displayed an ingrowth model. • The formation of KMgF 3 limited its further growth. • KMgF 3 reduced corrosion current density of AZ31 Mg alloy by 20 times. • KMgF 3 was protective due to its stability in NaCl solution. A KMgF 3 film was fabricated on AZ31 Mg alloy using a two−step approach−first forming a MgF 2 film by immersion in 0.1 mol·dm-3 NH 4 F solution with pH 7, and then growing KMgF 3 by soaking in 1 mol·dm-3 KF solution with pH 7. The growth of KMgF 3 was investigated by analyzing its morphological, structural and compositional evolution. The corrosion resistance of the MgF 2 and KMgF 3 coated AZ31 Mg alloy was compared in 3.5 % NaCl solution with pH 7. The results showed that KMgF 3 grew in an ingrowth mode through KF diffusion into MgF 2 film. The formation of KMgF 3 blocked the diffusion of KF, inducing a decrease in the content and the formation rate of KMgF 3 with immersion time. KMgF 3 respectively reduced corrosion current density of AZ31 Mg alloy and the MgF 2 film coated AZ31 Mg alloy by 20 times and 18 times, due to chemical stability of KMgF 3 in NaCl solution. [Display omitted] [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Materials Research Bulletin is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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      – Type: doi
        Value: 10.1016/j.materresbull.2025.113727
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      – Code: eng
        Text: English
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        PageCount: 1
        StartPage: N.PAG
    Subjects:
      – SubjectFull: Corrosion resistance
        Type: general
      – SubjectFull: Protective coatings
        Type: general
      – SubjectFull: Magnesium fluoride
        Type: general
      – SubjectFull: Fabrication (Manufacturing)
        Type: general
      – SubjectFull: Saline solutions
        Type: general
      – SubjectFull: Magnesium alloys
        Type: general
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      – TitleFull: A two−step approach to form KMgF3 on AZ31 magnesium alloy: growth and protectiveness mechanism.
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            – D: 01
              M: 02
              Text: Feb2026
              Type: published
              Y: 2026
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              Value: 194
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