Electrodeposition of Ni-Fe-Mo-W Alloys - Part 4
4th-6th Quarterly Report - AESF Research Project #R-117. This NASF-AESF Foundation research project report covers the fourth through sixth quarters of project work (October 2013-June 2014).
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By Prof. E.J. Podlaha-Murphy, A. Almansur, A. Kola and K. Duarte, Northeastern University
Editor’s Note: This NASF-AESF Foundation research project report covers the fourth through sixth quarters of project work (October 2013-June 2014). A printable PDF version is available by clicking HERE.
The project, initiated in January 2013, addresses the induced codeposition of molybdenum and tungsten alloys with nickel and iron having a focus on developing a toolbox of plating conditions to deposit different combinations of Ni, Fe, Mo and W. This paper covers progress made during the fourth, fifth and sixth quarters.
Through NASF-AESF Foundation funding, several students, both graduate and undergraduate, have gained experience in surface finishing research. In this nine-month period, there has been a change in student participation. Undergraduate student Matthew Silva completed his degree and started employment at Physical Sciences Inc. A new undergraduate student, Abdullah Almansur, a Northeastern University sophomore, began training in the lab, and is currently working on the hydrogen catalysis properties of NiMoW. Graduate student Avinash Kola continues work on the influence of deposition conditions on the properties of the NiMoW alloys. Finally, undergraduate student Kimberly Duarte is working on assessing the corrosion properties of novel NiMoW alloys.
NiMoW Deposition and Hydrogen Catalysis
Abdullah Almansur, undergraduate student
In earlier project work, a non-ammonia electrolyte was developed for NiMoW electrodeposition. Figure 1 shows a deposit from earlier work created on a rotating Hull cell. The electrolyte contained 0.15M nickel sulfate, 0.005M sodium molybdate, 0.075M sodium tungstate, 0.375M sodium citrate, and 1.0M boric acid at pH 7.0. The Hull cell deposit, with a variation in current density, was deposited with an average current density of 16.5 mA/cm2. The deposit composition, previously reported, is shown in Fig. 1(b) for reference.
Different regions of the deposit were tested for their ability to catalyze hydrogen. The polarization data in Fig. 1(c) is a test of three different deposit current density regions: a low current density (8.25 mA/cm2), a medium current density (33.0 mA/cm2) and a high current density (164 mA/cm2). Deposition was carried out on a rotating cylinder electrode, at 500 rpm, in 1.0M sodium hydroxide.