The effect of Cr content on the corrosion resistance of WC-Ni-Cr-Mo composites

Santos, Rui M; Rocha, A.M. Ferro; Bastos, A.C.; Cardoso, J.; Rodrigues, F; Fernandes, C.M.; Sacramento, J.; Ferreira, M. G. S.; Senos, A.M.R.; Fonseca, C.; Vieira, Manuel F.; Malheiros, L. F.

doi:10.1016/j.ijrmhm.2020.105434

Cited by 30 publications

(8 citation statements)

References 31 publications

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“…Firstly, the Co-rich HMs (Co-Ni and Co-Ni-Cr-Mo) are much less resistant than the Ni-rich ones (Ni-Co, Ni-Co-Cr-Mo) and addition of Cr + Mo (Co-Ni-Cr-Mo and Ni-Co-Cr-Mo) enhances dramatically the corrosion resistance of both grades. This quantitative outcome is coherent with the literature on the corrosion-resistance enhancement of grades with these additives[43,44,65,66,71]. The voltammetric behavior of the Cr + Mo containing Co-rich grade (Co-Ni-Cr-Mo) is similar to that of the Ni-rich (Ni-Co) one without binder additives.Focusing on the details of the CVs of Figure1a-d-in combination with the evolution of the anodic charge with ATV and number of cycles, analyzed in FigureS1in the Supplementary Material-it can be noticed that there are classes of the CV pattern group in specific potential ranges, as detailed in FiguresS2-S5in the Supplementary Material.…”

supporting

confidence: 88%

In-Depth Understanding of Hardmetal Corrosion Performance Reveals a Path to the Electrochemical Demolition of Scrap

Bozzini,

Tavola,

Travella

et al. 2023

Metals

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Recycling of hardmetal scrap is strategic for critical raw materials recovery. Available recycling processes are polluting and have a large carbon footprint. Attempts to exploit controlled corrosion failed in industrial practice, owing to self-limiting processes. We revisit the corrosion route, in view of gaining the fundamental knowledge enabling high-throughput recovery. We selected the worst-case approach of highly corrosion-resistant CoNiWC-based hardmetal grades and neutral aqueous electrolyte at room temperature. Systematic electrochemical measurements, UV–Vis spectroscopy and SEM microscopy disclosed that, even though there is no hope to overcome the self-limiting corrosion rate, nevertheless, by exploiting the mechanical action of anodic O2 evolution acting precisely at the interface between the residual active material and the corrosion film, the latter can be efficiently removed, periodically reactivating the hardmetal corrosion in a way that results in an ultra-high scrap destruction rate, of interest for real-life industrial processes.

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supporting

confidence: 88%

In-Depth Understanding of Hardmetal Corrosion Performance Reveals a Path to the Electrochemical Demolition of Scrap

Bozzini,

Tavola,

Travella

et al. 2023

Metals

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“…In general, the added elements also have an effect on the corrosion resistance of alloys. Santos et al [26] found that the addition of Cr can effectively reduce the corrosion susceptibility of WC–Ni–Cr–Mo composites in chloride solution without affecting the mechanical performance compared to that in the sulphate environment. Zhang et al [27] investigated the effect of Co addition on the corrosion resistance of AlNiZrYCo x high entropy metal and showed a gradual increase in corrosion resistance with increasing Co content.…”

Section: Introductionmentioning

confidence: 99%

The effect of Mn addition on corrosion behaviour of equiatomic CoCrFeNi high entropy alloys in NaCl solution

Zhang

Zhu

Yuan

et al. 2022

Corrosion Engineering, Science and Technology

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The corrosion behaviour of equiatomic CoCrFeNi and CoCrFeNiMn high entropy alloys manufactured by the vacuum arc melting were studied in 3.5 wt-% NaCl solution. And the reasons for the differences in corrosion resistance were investigated in terms of microstructure, electrochemical behaviour and oxide film. The results show that the two alloys exhibit different corrosion characteristics, with CoCrFeNi alloy displaying typical passivation characteristics and CoCrFeNiMn alloy exhibiting activation behaviour. The CoCrFeNi HEA with compact and protective passive film has lower corrosion current density, larger film resistance and polarisation resistance, meaning a lower corrosion rate and superior corrosion resistance compared with those of CoCrFeNiMn alloy. Moreover, CoCrFeNiMn alloy forms a discontinuous and loose corrosion product film with higher Mn content and lower contents of Cr, Fe and Co compared to the matrix, which decreases its protection performance. The addition of Mn changes the electrochemical behaviour, and higher Mn oxides/hydroxides within oxide film are unfavourable to forming a stable passive film.

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“…Similar equivalent circuits have been previously proposed for stainless steel and nickel alloys in neutral and acidic environments. 31,32 The last part considers a complex ohmic impedance described below (Z HN ). It can be specified that a Warburg element was added in series to the charge transfer resistance to consider the oxygen diffusion in the thin-film electrolyte, but the extracted parameters were inconsistent.…”

Section: Resultsmentioning

confidence: 99%

Potential of a Thin-Film Cell for assessing the Sensitivity of Nickel-Base Alloys to Crevice Corrosion

Klinklin,

Marcelin,

Ter-Ovanessian

et al. 2023

J. Electrochem. Soc.

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Nickel-base alloy 825 is prone to crevice corrosion in seawater. A modified and updated thin-layer cell was used to mimic crevice corrosion, and a new approach to monitor the evolution of the material behavior was developed. The corrosion potential, polarization resistance, and electrolyte resistance were demonstrated to be good indicators to follow the different stages of the crevice-corrosion process. The results were discussed in regard to the cathodic process kinetic. The different tested conditions justify the interest of the methodology developed for this set-up.

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The effect of Cr content on the corrosion resistance of WC-Ni-Cr-Mo composites

Cited by 30 publications

References 31 publications

In-Depth Understanding of Hardmetal Corrosion Performance Reveals a Path to the Electrochemical Demolition of Scrap

In-Depth Understanding of Hardmetal Corrosion Performance Reveals a Path to the Electrochemical Demolition of Scrap

The effect of Mn addition on corrosion behaviour of equiatomic CoCrFeNi high entropy alloys in NaCl solution

Potential of a Thin-Film Cell for assessing the Sensitivity of Nickel-Base Alloys to Crevice Corrosion

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