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Coatings 2018, 8(3), 96; https://doi.org/10.3390/coatings8030096

Characterization of Electroless Ni–P Coating Prepared on a Wrought ZE10 Magnesium Alloy

1
Materials Research Centre, Faculty of Chemistry, Brno University of Technology, Purkyňova 464/118, 612 00 Brno, Czech Republic
2
Faculty of Mechanical Engineering, Brno University of Technology, Technická 2896/2, 602 00 Brno, Czech Republic
*
Author to whom correspondence should be addressed.
Received: 19 February 2018 / Revised: 1 March 2018 / Accepted: 6 March 2018 / Published: 7 March 2018
(This article belongs to the Special Issue New Generation Coatings for Metals)
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Abstract

Electroless low-phosphorus Ni–P coating was deposited on a wrought ZE10 magnesium alloy including an advanced pre-treatment of the material surface before deposition. Uniform Ni–P coating with an average thickness of 10 µm was formed by 95.6 wt % Ni and 4.4 wt % P. The content of Ni and P was homogeneous in the entire cross-section of the coating. Applying the Ni–P coating to the magnesium substrate, the surface microhardness increased from 60 ± 4 HV 0.025 to 690 ± 30 HV 0.025. Using the scratch test, it was determined that deposited Ni–P coating exhibits a high degree of adhesion to the magnesium substrate. Electrochemical corrosion properties of Ni–P coating were analyzed using the polarization tests in 0.1 M NaCl, while the deposited Ni–P coating showed an improvement of the corrosion resistance when compared to the ZE10 magnesium alloy. Using the scanning electron microscopy analysis, it was determined that the fine morphology of the deposited Ni–P coating did not contain visible microcavities. The absence of macrodefects due to the adequate pre-treatment before coating was reflected on the mechanism of the coated ZE10 degradation in a 0.1 M NaCl solution. View Full-Text
Keywords: electroless deposition; Ni–P coating; magnesium alloy; ZE10; adhesion; microhardness; EDS analysis; polarization test electroless deposition; Ni–P coating; magnesium alloy; ZE10; adhesion; microhardness; EDS analysis; polarization test
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Buchtík, M.; Kosár, P.; Wasserbauer, J.; Tkacz, J.; Doležal, P. Characterization of Electroless Ni–P Coating Prepared on a Wrought ZE10 Magnesium Alloy. Coatings 2018, 8, 96.

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