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Optimizing parameters affecting electroless Ni-P coatings on AZ91D magnesium alloy as corrosion protection barriers

  • Physicochemical Problems of Materials Protection
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Abstract

Magnesium alloys are materials difficult to plate due to their high reactivity. The surface passive layer formed in air or water must be first removed prior the plating process. Generally, it was shown that electroless Ni–P coatings on AZ91D alloy are directly related to its surface pretreatment parameters and the various plating conditions. Micro-image morphology and chemical composition of the different coats were characterized by SEM, EDX, XRF and XRD techniques. Electrochemical polarization, porosity and adhesion tests were also performed to study the corrosion resistance of the samples. The plating step was accomplished either after a zincating treatment or directly after the fluoride activation treatment using basic nickel plating bath. Successful direct EN coatings obtained are good corrosion barriers for AZ91D alloy in aggressive environments.

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Authors and Affiliations

  1. Chemistry Department, Faculty of Science, Cairo University, Giza, 12613, Egypt

    Fakiha El-Taib Heakal

  2. Central Metallurgical Research and Development Institute (CMRDI), Helwan, Cairo, Egypt

    Madiha A. Shoeib & Maanoum A. Maanoum

Authors
  1. Fakiha El-Taib Heakal
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  2. Madiha A. Shoeib
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  3. Maanoum A. Maanoum
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Correspondence to Fakiha El-Taib Heakal.

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Heakal, F.ET., Shoeib, M.A. & Maanoum, M.A. Optimizing parameters affecting electroless Ni-P coatings on AZ91D magnesium alloy as corrosion protection barriers. Prot Met Phys Chem Surf 53, 177–187 (2017). https://doi.org/10.1134/S2070205116060095

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  • DOI: https://doi.org/10.1134/S2070205116060095

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