Remote Monitoring Technique for Evaluation of Corrosion on Reinforced Concrete Structures

Rodríguez, Guillermo Roa; Aperador, W.

doi:10.5772/62314

Cited by 3 publications

(2 citation statements)

References 8 publications

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“…The use of LPR techniques and Stern-Geary theory provides a convenient and non-destructive methodology to determine the tribocorrosion currents of materials close to equilibrium [85,86]. It has been shown by many authors that the application of sustained over-potential affects both the material-protein interactions and tribocorrosion mass loss mechanisms [38,48,[87][88][89].…”

Section: Limitations Of the Studymentioning

confidence: 99%

The Effect of Protein Structure and Concentration on Tribocorrosion and Film Formation on CoCrMo Alloys

2021

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The formation of tribochemical reaction layers, better known as tribofilms, on cobalt-chromium-molybdenum (CoCrMo) alloys commonly used in orthopaedic applications has been hypothesized to reduce degradation owing to wear and corrosion. However, the mechanisms and pathways influencing tribofilm formation remain largely unknown. This study aims to develop a clearer understanding of the role of protein structures and its concentration on tribocorrosion and surface tribofilms formed on CoCrMo alloys during boundary regime sliding. A reciprocating tribometer with a three-electrode electrochemical cell was employed to simulate and monitor the tribocorrosion of CoCrMo in situ. As-received Foetal Bovine Serum (as-FBS) and pre-heated FBS at 70 °C for 1 h (de-FBS) were diluted with saline (0.9% NaCl) at different concentrations (25% and 75% v/v) and utilized as electrolytes during the tribocorrosion tests. The result shows that the denatured protein structure in electrolyte tends to reduce the volume losses due to wear and corrosion on the CoCrMo samples with an appreciation of the protein tribofilms. On the other hand, an increased protein concentration increased the total volume loss due to corrosive processes. A novel finding revealed in this study is that the tribocorrosion mechanism of the CoCrMo surface is dependent on the protein structure, concentration and sliding duration due to the change in surface condition.

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Section: Limitations Of the Studymentioning

confidence: 99%

The Effect of Protein Structure and Concentration on Tribocorrosion and Film Formation on CoCrMo Alloys

2021

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“…B value is often taken as 25 mV for active corrosion state and 50 mV for passive conditions [41]. E w is the equivalent weight of the corroding metal.…”

Section: Polarisationmentioning

confidence: 99%

Corrosion Evaluation of Geopolymer Concrete Made with Fly Ash and Bottom Ash

et al. 2021

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Environmental pollution caused by CO2 releasing from the production of cement is a great challenge for the construction industry and has triggered exploration into more sustainable alternatives. Geopolymer Concrete (GPC) is a potential sustainable solution that does not involve the use of cement as a binder. GPC is produced by mixing the alumino-silicate source materials such as fly-ash with alkali activators such as potassium hydroxide (KOH) and potassium silicate (K2SiO3). Unlike Ordinary Portland Concrete (OPC), the characteristics of GPC depend on the precursor materials and therefore vary for different mixes. Consequently, corrosion behavior needs to be evaluated separately for individual mixes. This has narrowed the scope of existing published work on corrosion behavior of GPC. In this study, GPC and OPC specimens were prepared and exposed to accelerated corrosion exposure. Half-cell potential and linear polarization resistance were used to evaluate the corrosion rate in GPC and OPC. Under accelerated conditions, the corrosion rate of the GPC specimens was between 10 µm/year and 20 µm/year exhibiting a moderate to high rate of corrosion. Meanwhile, the corrosion rate of the OPC specimens was between 40 µm/year and 60 µm/year indicating a very high corrosion activity. It can be concluded that GPC has a higher resistance to chloride-induced corrosion; with a low corrosion rate and lower mass loss percentage, compared to OPC.

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Investigating the Roles of Protein on the Cobalt Alloy Surface Degradation for Biomedical Implant Through Tribocorrosion Mechanisms

Taufiqurrakhman,

Khan,

Bryant

2024

Tribol Lett

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Previous investigation has established the formation of tribofilm is influenced by tribochemical reactions between the electrolyte and the articulating surface of cobalt alloy through sliding tests in various simulated fluids. Although it has successfully characterized the film composition via spectroscopy analysis and indicated to have impact on material loss, a comprehensive understanding of the material degradation mechanism in tribocorrosion condition was still lacking. Therefore, this study aims to investigate the role of protein in the tribocorrosive degradation of cobalt-chromium-molybdenum (CoCrMo) alloy in different simulated physiological electrolytes. Using a similar testing protocol, tribocorrosion tests were conducted with reciprocating ceramic ball against CoCrMo samples immersed in saline and culture medium, compared to both electrolytes diluted with 25% fetal bovine serum (FBS). Synergistic and mechanistic approaches were employed to model the tribocorrosive degradation. Results reveal that protein plays a beneficial role in reducing corrosive (electrochemical) surface degradation under tribocorrosion condition, whilst increasing mechanical wear degradation in the process. Despite studies have shown that tribocorrosion behavior in metal alloys is highly influenced by the presence of organic matter, this study provides a more clarity of the roles played by protein in tribocorrosive degradation on CoCrMo surface as its novel finding.

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Remote Monitoring Technique for Evaluation of Corrosion on Reinforced Concrete Structures

Cited by 3 publications

References 8 publications

The Effect of Protein Structure and Concentration on Tribocorrosion and Film Formation on CoCrMo Alloys

The Effect of Protein Structure and Concentration on Tribocorrosion and Film Formation on CoCrMo Alloys

Corrosion Evaluation of Geopolymer Concrete Made with Fly Ash and Bottom Ash

Investigating the Roles of Protein on the Cobalt Alloy Surface Degradation for Biomedical Implant Through Tribocorrosion Mechanisms

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