Dorota Babilas

Study on the electrodialytic nickel concentration from electroplating industry waste

ABSTRACT Owing to the ability of electrodialysis to produce highly concentrated solutions from dilute stream, in this paper, the possibility of nickel recovery and concentration from real electroplating industrial waste was discussed. The results showed that the nickel content in solutions after electrodialysis was approximately two times higher than in the initial working solutions, and the nickel recovery exceeded 85%. The nickel electric current efficiency (CENi) depended upon the type of electroplating bath and its acidic behaviour. The CENi was in the range of 52.3–70.6%. Moreover, high boron and the total organic carbon retention coefficients equal to 88.92% and 93.93% respectively, were observed.

Influence of Electrolytic Polishing and Anodic Passivation on Corrosion Resistance of Ti-15Mo Alloy

This paper presents the results of investigations on electrolytic polishing and anodic passivation of Ti-15Mo alloy. The influence of chemical composition of the bath used in electrolytic polishing and anodic passivation process on the morphology, wettability and corrosion resistance of the electrochemically modified vanadium-free Ti-15Mo alloy was presented. The electropolishing process was carried out in a solution containing: sulphuric acid, ethylene glycol, ammonium fluoride and oxalic acid. Moreover, the anodic oxidation process was carried out in a 1.0 M H2SO4, 1.0 M H3PO4 and 0.5 M solution of K2SiO3 and 5 g/dm3 KOH. It was found that the electrolytic polishing and anodic passivation led to significant improvement of the surface morphology. The electrolytic polishing and anodic passivation of Ti-15Mo improved corrosion resistance of the alloy in contact with of Ringers physiological solution. The samples anodised at 100 V in 1.0 M H3PO4 presented the highest corrosion resistance.

Structure and Corrosion Behavior of Mg-Cu-Y-(Zn,Ni) Bulk Metallic Glasses

The work presents a structural and corrosion resistance analysis of Mg-based bulk metallic glasses in “as-cast” state. The studies were performed on bulk glassy samples in the form of plates. The structure analysis of the samples in “as-cast” state was carried out by the XRD and DSC methods. The corrosion behavior of the bulk glassy alloys and pure magnesium samples was studied by electrochemical measurements and immersion tests in 5% NaCl solution at room temperature. For the amorphous alloys the highest corrosion potential was achieved, indicating the formation of protective surface layers with Mg and Cu oxides. The corrosion behavior of the alloys with Zn and Ni addition was found to be better than pure magnesium.