Stanley Ofoegbu- Doctor of Philosophy
- Researcher at University of Aveiro
Stanley Ofoegbu
- Doctor of Philosophy
- Researcher at University of Aveiro
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28
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Publications
Publications (28)
Triazoles are well-known organic corrosion inhibitors of copper. 1H-1,2,3-Triazole and 1,2,4-triazole, two very simple molecules with the only difference being the positions of the nitrogen atoms in the triazole ring, were studied in this work as corrosion inhibitors of copper in 50 mM NaCl solution using a set of electrochemical and analytical tec...
Suppression of electrochemical activity (cathodic activity) on CFRP surface at cathodic potentials consistent with galvanic coupling of CFRP with active metals like aluminium and zinc have been demonstrated by electrochemical treatment of CFRP surface in the presence of sodium dodecyl sulphate (SDS). Modification to the CFRP surface by SDS adsorpti...
Carbon is used as a reinforcing phase in carbon-fiber reinforced polymer composites employed in aeronautical and other technological applications. Under polarization in aqueous media, which can occur on galvanic coupling of carbon-fiber reinforced polymers (CFRP) with metals in multi-material structures, degradation of the composite occurs. These d...
Food contamination due to metal corrosion and the consequent leakage of metals into foods is a problem. Understanding the mechanism(s) of metal corrosion in food media is vital to evaluating, mitigating, and predicting contamination levels. Fruit juices have been employed as model corrosive media to study the corrosion behaviour of metallic materia...
In a quest for a better understanding of the mechanism and contribution(s) of fresh (“un-degraded”) and degraded CFRP surfaces to galvanic corrosion of coupled metals in multi-material assemblies the electrochemical behaviour of CFRP in quiescent 50 mM NaCl was studied using electrochemical techniques. Tests using ferricyanide/ferrocyanide redox co...
Plant extracts are prone to microbial growth that can lead to microbial-induced corrosion (MIC), a major setback for their performance and stability as corrosion inhibitors. Hence, this work aims to identify the microbes that may cause the ineffectiveness of carica papaya leaf extract (CPLE) as a bio-corrosion inhibitor of cold-rolled mild steel in...
Laser marking is a critical production process step in most automated production systems. However, some materials such as polyoxymethylene (POM) can be quite challenging to laser to 80 kHz.mark, hence the need to develop new laser marking methods. By employing a wide range of marking parameters (marking speed 15–2000 mm/s, laser power from 10 to 10...
Carbon-based reinforcements are widely used in composite materials for a wide range of applications including wind energy and transportation. In the later, the carbon-fiber reinforced polymers (CFRP) components are often joined together with metallic parts creating conditions for galvanic corrosion. Therefore, a deeper understanding of the electroc...
Polyoxymethylene (POM) is a semi-crystalline engineering thermoplastic polymer employed in the manufacturing of precision parts for engineering applications requiring high dimensional stability and good frictional resistance properties. Due to its lower cost and ease of integration into automated manufacturing processes, laser marking is the state...
Polyoxymethylene (POM) is a semi-crystalline engineering thermoplastic polymer employed in the production of precision parts in applications that demand good dimensional stability and frictional properties. Consistent with modern manufacturing practices, laser marking is a desirable method for marking products for branding and coding in order to en...
Carbon-fiber-reinforced polymers (CFRP), being conductive, are capable of supporting cathodic oxygen reduction reactions (ORR) and thus promote galvanic corrosion when coupled to many metallic materials. Hence, understanding cathodic processes at carbon surfaces is critical to developing new strategies for the corrosion protection of multi-material...
Smart protection of metallic materials is currently a hot topic in mitigation of corrosion of metallic structures, and promises reduction in both economic and environmental costs. Degradation of carbon-reinforced composite materials and CFRP-Metal joints is a serious issue in high-performance weight-optimized structures employed in the aeronautical...
Increasing demands for environmental accountability and energy efficiency in industrial practice necessitates significant modification(s) of existing technologies and development of new ones to meet the stringent sustainability demands of the future. Generally, development of required new technologies and appropriate modifications of existing ones...
With the present rates of iron ore consumption, currently unusable, high-phosphorus iron ore deposits are likely to be the iron ores of the future as higher-grade iron ore reserves are depleted. Consequently, the design and timely development of environmentally-benign processes for the simultaneous beneficiation of high-phosphorus iron ores and pho...
Characterization of Agbaja iron ore was carried out using optical microscopy, scanning electron microscopy with energy-dispersive X-ray spectroscopy, X‐ray fluorescence spectrometry, powder X-ray diffraction, thermal gravimetry, and differential scanning calorimetry. The ore consists of a matrix of gangue minerals composed principally of aluminosil...
High methoxyl pectin (DE = 59.53%) was extracted from plantain peel using acid extraction method. Pectin yield was 40.5%; moisture content was 87.56%; equivalent weight was 1000 g/ml, and galacturonic acid content was 2.89 mg/ml. Composite polymer films incorporating the extracted pectin manifest their best mechanical properties; tensile strength a...
Epoxy composites filled with nanoporous core-shell clay filler were processed by a modified 2-stage high speed mixing. Nanoporous core clays coated with3-aminoprolytriethoxosilane (3-APTES) shell, used as filler, were chemically linked with epoxide end groups of diglycidyl ether of bisphenol A (DGEBA)and amine hardener, leading to the formation of...
The development of the weight-optimized multi-material design concepts in particularly the transport sector, (e.g. in the superlight car project and in the weight reduction initiatives of the aerospace industry) has brought about the use of materials with different corrosion behaviours into the same product. The possible corrosion challenges in suc...
Typical hybrid sol-gel formulation based on TPOZ and GPTMS has been used for incorporation of nanocontainers with corrosion inhibitors. The aim is to obtain active protection based on “self-healing” of defects in coatings. In this paper different nanocontainers loaded with inhibitors such as LDH, SiO2 nanoparticles and Halloysite nanotubes (HS) wer...
The inhibition of carbon steel corrosion by Chloroquine diphosphate in acidic media have been studied in the concentration range 10-6 to 10-2M by gravimmetry in the temperature range from 25-50oC, and at ambient using potentiodynamic test, measurements of open circuit potential (OCP) and electrochemical impedance spectroscopy (EIS). Results indicat...
Scanning electron microscopy and cyclic voltammetry were used to investigate the high-temperature oxidation behavior of two solid oxide fuel cell interconnect steels. One alloy had a low content of manganese; the other alloy had a high content of manganese. Four reduction and four oxidation peaks were observed in the voltammograms of the low mangan...
The results of trials on Chloroquine diphosphate as eco-friendly corrosion inhibitor for mild steel in 0.1M HCl solutions using weight loss technique over a duration of 49 days (1176 hours) are reported. The results obtained indicated that Chloroquine phosphate had promising inhibitive effect at all concentrations used in the study, on the corrosio...
The corrosion of mild steel (uncoated), galvanized steel and stainless steel (304L) have been studied using the weight loss method over a period of 98 days with measurements made at 14 days’ interval in ground melon (locally called egusi), cassava pulp, mashed palm fruit, tomato pulp, and black-eyed bean pulp respectively. The results obtained show...
The corrosion of mild steel (uncoated), galvanized steel and stainless steel (304L) have been studied using the weight loss method over a period of 98 days with measurements made at 14 days’ interval in ground melon (locally called egusi), cassava pulp, mashed palm fruit, tomato pulp, and black-eyed bean pulp respectively. The results obtained show...
