Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 619, Issue -, Pages 697-703Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2014.09.087
Keywords
Ni-W-Fe alloy; Electrodeposition; Corrosion; Microhardness; Response surface methodology
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Funding
- National Counsel of Research and Technology of Brazil (CNPq)
- North/Northeast Brazilian Corrosion Group
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Corrosion has been responsible for industrial maintenance cost as well as for industrial accidents. A key to prevent corrosion is to develop advanced materials with highly anti-corrosive properties. The electrodeposition has been one of the most important techniques for obtaining these materials. The objective of this work is to develop and optimize the parameters to obtain a new Ni-W-Fe alloy with high resistance to corrosion. A factorial design 2(2) with 2 center points was used to find the optimal current density and bath temperature for Ni-W-Fe electrodeposition. The influence of such variables on the cathodic current efficiency and polarization resistance were obtained. The alloys obtained with the highest current density (125 mA/cm(2)) and the highest bath temperature (70 degrees C) had the best anticorrosive properties, which are superior to anticorrosive properties of Ni-W-Fe available in the literature. The obtained alloys had the highest tungsten content compared with other alloys studied of about 46 wt.%. The highest cathodic current efficiency was 34% for the alloy with a chemical composition of 3 wt.% Fe, 29 wt.% W and 68 wt.% Ni. (C) 2014 Elsevier B.V. All rights reserved.
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