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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
chemistry
Electroless Ni-P coating of different magnesium alloys
Surface and Coatings Technology, Volume 202, No. 21, Year 2008
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Description
Coating of AZ31B, AE 42 and ZRE1 wrought magnesium alloys was carried out using electroless Ni plating technique in a solution of nickel sulphate, sodium hypophosphite, ammonium hydrogen fluoride and glycine with a zinc immersion pre-treatment. The results of SEM/EDX investigations and X-ray diffraction indicate that the coat exhibit a typical surface morphology with compact nodules with good adherence to the substrate. The coat was composed of amorphous structure, which transformed to a mixture of crystalline Ni and Ni3P precipitates after heat treatment at 673°K for 1 h. The phosphorous (P) content increased gradually from the substrate towards the surface reaching a maximum of 10 wt.% to 18 wt.% on the surface depending on the substrate alloy and the thickness of deposit. The hardness of the coat was found to increase with the P content and also after heat treatment. The electrochemical corrosion test in NaCl solution indicated a great improvement in the corrosion resistance of the Mg substrates and that a noble behaviour of Ni-P was obtained regardless of the heat treatment process. The forming ability test indicates that hot rolling of the coated substrate does not succeed to keep a continuous coat due to cracking of the coat in both as-coated and heat treated specimens. © 2008 Elsevier B.V. All rights reserved.
Authors & Co-Authors
El-Mahallawy, N.
Egypt, New Cairo
Faculty of Engineering and Materials Science
Bakkar, Ashraf
Germany, Clausthal-zellerfeld
Inst Fur Werkstoffkunde Und
Egypt, Ismailia
Suez Canal University
Shoeib, Madiha A.
Egypt, Cairo
Central Metallurgical Research and Development Institute
Palkowski, Heinz
Germany, Clausthal-zellerfeld
Technische Universität Clausthal
Neubert, Volkmar W.M.
Germany, Clausthal-zellerfeld
Inst Fur Werkstoffkunde Und
Statistics
Citations: 94
Authors: 5
Affiliations: 5
Identifiers
Doi:
10.1016/j.surfcoat.2008.05.037
ISSN:
02578972