Electrodeposition and corrosion behaviour of a Ni–W–B amorphous alloy

Abstract

Electrodeposition of Ni-W-B alloys from plating baths containing ammonia and citrate is reported. Optimum conditions for plating including current density, temperature, mechanical agitation and pH were studied. The corrosion resistance and amorphous character were also evaluated. The operational conditions for depositing the alloy with good corrosion resistance were: current density 35 mA cm )2 , bath temperature 40°C, pH 9.0 and cathode rotation at 90 rpm. The alloy was deposited at 38% current efficiency, with an average composition of 73 wt% Ni, 27 wt% W and traces of boron and with E corr )0.300 V and R p 3.369Â10 4 W. The deposit obtained under these conditions had an amorphous character with the presence of some microcracks on its surface reaching down to the copper substrate. Electrochemical corrosion tests verified that the Ni-W-B alloy had better corrosion resistance than Co-W-B.

Influence of cathodic current density and mechanical stirring on the electrodeposition of Cu-Co alloys in citrate bath

“…Therefore, it is important to develop a more scientific approach leading to a better fundamental understanding of the alloy deposition phenomenon. This could be obtained using experimental design and statistical approaches [11][12][13] , which would make it possible to improve both, the process performance and the reliability, as well as to establish new alloys systems.…”

Electrodeposition of Composite Coatings of Cu/AlO(OH) Using Allyl Alcohol as an Additive

“…Moreover, this procedure is always time-consuming, requiring a significant number of experiments and, most of the time, producing substantial amounts of wastewater. Additionally, the combined influence of the several parameters on the studied variables is not evaluated by these methodologies, indicating that the observed optimum levels should be considered carefulness 30,32,33 . Therefore, to ensure a greater reproducibility and quality of the composite coatings produced by electrodeposition, it is important the development of a scientific approach that leads to a better understanding of the deposition phenomena.…”

“…In addition, it is possible to create new coating systems that can fulfill different industrial needs 31,36,37 . Nowadays, several reports can be found in the literature concerning the use of these methodologies to enhance the quality of electrodeposition baths or to achieve realistic optimized conditions 30,[32][33][34][36][37][38][39][40][41] . The microstructure of the composite coatings depends on both the metallic matrix and the second phase material.…”

Experimental Design and Response Surface Analysis as Available Tools for Statistical Modeling and Optimization of Electrodeposition Processes

“…For example, electrodeposited Cu is the material of choice for the interconnects in ultra-large-scale integrated (ULSI) circuits, and electrodeposited soft magnetic alloys are an important component of magnetic recording heads (Schwarzacher, 2004;Yoshida et al, 2009). In fact, the deposition of alloy coatings is one of the most rapidly expanding topics in the current literature (Oriňáková et al, 2006;Santana et al, 2006Dubent, 2007;Ferreira et al, 2007;Silva et al, 2008;Brankovic et al, 2009;Gupta & Podlaha, 2010, Düzgün et al, 2010. Compared to the electrodeposition of a single metal, alloy coatings show better properties because their chemical composition can be varied to the required function.…”

“…Compared to the electrodeposition of a single metal, alloy coatings show better properties because their chemical composition can be varied to the required function. Alloy coatings are denser, harder, generally more resistant to corrosion, possess better magnetic properties and are suitable for subsequent coating by electrodeposition (Senna et al, 2003;Santana et al, 2006). Nanostructured coatings, with their advanced properties, can also be produced by electrodeposition, where the nanoparticles are directly attached to the substrate.…”