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Ni-W alloys and their anticorrosive properties: Ni removal efficiency from galvanic wastewater by electrodeposition

2020; Elsevier BV; Volume: 36; Linguagem: Inglês

10.1016/j.jwpe.2020.101250

2214-7144

Mariana Borges Porto, Josiel Martins Costa, Ambrósio Florêncio de Almeida Neto,

Advanced materials and composites

The electroplating industrial wastewater is an environmental issue due to the high metal concentration and difficulty in disposing of the final residue generated by the formation of sludge when using the precipitation method. In this context, we propose to remove nickel from wastewater from the jewelry industry wastewater to obtain corrosion-resistant Ni-W alloys by the electroplating process. The concentration of nickel removed from the effluent was quantified by ultraviolet-visible (UV/vis) spectroscopy indicating removal close to 40 %. X-ray Diffraction (XRD) patterns showed the crystallinity of the deposits, as well as the Scanning Electron Microscope (SEM) with the Energy-Dispersive X-Ray Spectroscopy (EDX) technique determined homogeneity and the composition with 76 wt.% Ni/24 wt.% W for the optimized alloy. Besides, corrosion resistance tests by linear polarization indicated an Rp value of 29,199 Ω m2.