Development of Non Chromate Conversion Coatings on AZ31 Alloy: Effect of Nickel Overcoat

Josef Hazan; Menachem Bamberger

doi:10.4028/www.scientific.net/MSF.765.602

Paper Titles

Reducing Mechanical Asymmetry in Wrought Magnesium Alloys
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Modelling Creep Induced by Machining Residual Stresses in Aluminium Alloys
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Crashworthiness of Magnesium Sheet Structures
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Extending the Life of Light Alloy Components: Microstructure, Corrosion, Inhibition and Performance Assessment
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Development of Non Chromate Conversion Coatings on AZ31 Alloy: Effect of Nickel Overcoat
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Influence of Microstructure on the Corrosion Resistance of AZ91D after EB Surface Alloying
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Effect of Zn Content on the Microstructure and Corrosion Behaviour of Mg-7Y-0.6Zr Alloy
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Comparison of Corrosion Resistance of High Pressure Die-Cast and Semi-Solid Cast AZ91, AM60, Alloys and Respective Anodic Oxides
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Relating Grain Misorientation to the Corrosion Behaviour of Low Copper 7xxx Aluminium Alloys
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HomeMaterials Science ForumMaterials Science Forum Vol. 765Development of Non Chromate Conversion Coatings on...

Development of Non Chromate Conversion Coatings on AZ31 Alloy: Effect of Nickel Overcoat

Abstract:

Permanganate-based conversion coating, using nitric acid as an oxidative additive has been performed and analysis shows the reduction products of permanganate mainly MnO₂, and oxidation products of magnesium (MgO and Mg(OH)₂). Stannates-based coating has also been obtained in high basic medium using acetate- pyrophosphate additives. Isolated grains formed having a quasi-spherical form which have been identified as mixed magnesium and tin oxides. Particles very rich in tin are observed and discussed in terms of standard reduction potentials E⁰_red.

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Periodical:

Materials Science Forum (Volume 765)

Pages:

602-606

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.765.602

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Online since:

July 2013

Authors:

Josef Hazan, Menachem Bamberger

Keywords:

Chrome Free Conversion, Magnesium Alloy, Ni Overcoat, Permanganate, Stannate

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References

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