Papers by Keyword: Corrosion Inhibitor

Abstract: This study proposes the use of an innovative acidified metallic halide solution to address brass corrosion. The research identifies key parameters that contribute to corrosion and demonstrates that the new solution can effectively restore oxidized brass surfaces, serving as a simple and safer alternative corrosion inhibitor. The formulated solution consists of a metallic halide, an organic acid, and alumina as an abrasive. The metallic halide functions as an oxidation inhibitor, preventing the formation of copper (I) oxide (Cu₂O) and zinc oxide (ZnO). Analytical results confirmed the effectiveness of the treatment solution. FTIR spectroscopy showed reduced oxide formation, while EDX revealed a lower oxygen signal and the presence of iodine, indicating successful corrosion inhibition and surface modification. SEM images demonstrated significant surface improvement after treatment, with reduced pitting and oxidation compared to the corroded sample. Contact angle measurements confirmed that treated surfaces transitioned from hydrophilic to hydrophobic states, indicating successful restoration. This process offers a practical, efficient, and safer corrosion mitigation method for brass, addressing a critical need for metal manufacturers and suppliers.

Abstract: Syzygium cumini is a plant belonging to the Myrtaceae family and is widely used in medicine and food. However, its application in the engineering field is still very minimal, particularly as an anti-corrosion material. There are also limited studies on the quantitative screening of phytochemical and bioactivity of S. cumini. Therefore, this study aims to analyze the chemical compounds of S. cumini fruit as a corrosion inhibitor as well as determine total tannin (TTC) and flavonoid (TFC) content. The extraction process was carried out with a soxhlet extractor using 96% ethanol solvent. Characterization was then conducted using FTIR (Fourier Transfer Infrared) test and total antioxidant test with a UV-Vis spectrophotometer. Spectrum analysis showed the presence of Hydroxyl (O-H), Alkane (C-H), Carbonyl (C=O), Aromatic Ether (C-O), and Amine (C-N) functional groups. The results also revealed that TTC was 26.83% higher, while TFC was 2.11%. In addition, S. cumini fruit was reported to contain high functional groups and antioxidant compounds, which were useful as active molecular inhibitor ingredients.

Abstract: In order to increase and extend the usage of mild steel in a range of applications, critical research needs are extremely interested in corrosion studies, including corrosion inhibitor performance. The goal of this study is to look at the corrosion-inhibiting capabilities of ammonium benzoate in a 0.5 M HCl solution for mild steel, with solanum tuberosum (potato) extract serving as a surfactant. Mild steel samples were cut into corrosion coupons and submerged in 0.5 M HCl media to investigate the inhibitory effects at room temperature for various concentrations of ammonium benzoate using polarisation and weight loss techniques. A scanning electron microscopy fitted with electron dispersion spectroscopy (SEM-EDS) was used to investigate the morphology of the corroded samples. The results obtained indicated that ammonium benzoate performed better when combined with solanum tuberosum (potato) extract as a surfactant that inhibits mild steel corrosion in 0.5 M HCl by lowering the rate of corrosion. As the concentration rises, ammonium benzoate becomes more effective. From the weight loss test and polarisation analysis, a maximum inhibition efficiency of 99.94% at the 1.0 M concentration of inhibitor was achieved. It was observed that the ammonium benzoate adsorption mechanism isotherm fit with the Langmuir absorption isotherm when it was adsorbed on mild steel. Furthermore, adding solanum tuberosum (potato) extract to the inhibitor significantly reduces the rate of mild steel corrosion in HCl solution. The SEM micrographs confirm the presence of an absorbed protective film layer on the mild steel surface.

Abstract: The potentiodynamic polarization method has investigated the corrosion behavior of zinc metal in 3.5% NaOH with a variation of bee wax popolis extract (BWPE) inhibitor, variation of immersion time, and temperature. Zinc plates were tested at 150 °C and 200 °C with immersion durations of 2, 4, and 6 hours, respectively. The variation of inhibitor concentration on corrosion rate has also been studied from 0, 200, 400, 600, 800, and 1000 ppm, followed by testing temperature variations of 25, 35, and 45°C for optimal inhibitor concentration. It is expected that this research will contribute to alternative organic corrosion inhibitors. Tafel polarization test results demonstrated that the corrosion rate of zinc metal in 3% NaOH increased with increasing test temperature and immersion time. Increasing the concentration of BWPE inhibitor from 200 ppm to 1000 ppm can reduce the corrosion rate of zinc metal from the sample without blank with optimal inhibition effectiveness obtained at a concentration of 800 ppm by 46.16%

Abstract: Two AISI (316,304) stainless steel alloys were utilized in this work to enhance the surface properties and corrosion inhibiters with Al₂O₃ nanoparticles which was generated via pulse laser deposition (PLD). Alumina as biomaterial for dental purposes was prepared using the co-precipitation process and analysis by X-Ray diffraction. Alumina has drawn a lot of interest and is historically well-accepted .SEMs, and EDS, been used to describe researchers have studied the coating morphology. Roughness and Vickers hardness were utilized to quantify the surface modifications as part of an investigation into corrosion prevention employing mechanical properties submerged in saliva with a PH (5.6). When compared to bare AISI (316,304) stainless steel, all samples exhibit greater corrosion resistance.

Abstract: The effect of various chemical solutions and mixtures on the etch characteristics, roughness change, and surface composition of NiAl, Al, and Ni films were investigated. Both HCl solution (1.82%) and NH₄OH (0.6 and 1.45%) solutions were found to have a detrimental effect on NiAl film in terms of material etching (4-point probe results) and surface roughness change (AFM). Within the concentration range applied, adding H₂O₂ into the HCl or NH₄OH solutions resulted in a significant increase of the etching of the NiAl film. A correlation was observed between the magnitude of etching and increase in surface roughness suggesting that a preferential etching occurred, most likely of grain boundary. Experimental results showed that in the case of 1.82% HCl-H₂O₂ mixture, NiAl surface can be protected up to 240 s of immersion with the use of a corrosion inhibitor such as triazole (TA).

Abstract: Illegal disposal and recirculation of expired drugs is a global menace which can be solved by their re-utilization as corrosion inhibitors. Thus, helping to combat the current widespread corrosion-induced wastage of expensive mild steel infrastructure. The experimental investigation evaluated the capability and effectiveness of an expired drug (piroxicam) for inhibiting mild steel corrosion in blank 0.5M HCl and acidic environments containing 2 to 8 g/L of the expired drug. Spectrometry, weight loss analysis, atomic absorption spectroscopy, microscopy, polarisation and electrochemical impedance study (EIS) were employed. Analyses revealed drastic inhibition of corrosion in mild steel by expired piroxicam drug in the acid. Corrosion currents ( ) obtained at all concentrations of the expired drug were reduced in comparison to that of the uninhibited environment. The solution resistance recorded was not significantly altered; charge transfer resistances were increased while the capacitance of the electrochemical double layers (Double layer capacitance) as well as the concentration of dissolved iron (Feⁿ⁺) ions in the environment, were all reduced with increasing concentration of the expired drug. Although moderate amounts of the expired drug delivered appreciable levels of corrosion inhibition when dissolved directly into the corrosive environment and without any pre-treatment, increased concentration of expired drug resulted in increased corrosion inhibition efficiency. The highest corrosion inhibition efficiency obtained was 97.6% and was from the acidic environment that contained 8 g/L of expired piroxicam drug. The expired piroxicam drug inhibited corrosion of mild steel in 0.5M HCl acid via spontaneous physical adsorption (physisorption) process(s), obeying Langmuir’s adsorption isotherm.

Abstract: The inhibition performance of citrus x aurantiifolia extract (CXA) on the corrosion of mild steel in 1.5 M H₂SO₄, 2 M H₂SO₄, 3 M H₂SO₄, and 4 M H₂SO₄ solutions was evaluated by weight loss, potentiodynamic polarization techniques, and scanning electron spectroscopy equipped with energy-dispersive X-ray spectroscopy. CXA inhibited the mild steel corrosion in the sulphuric acid solutionswith optimal inhibition results of 96.06% in 1.5 M H₂SO₄ and 86.57% in 4 M H₂SO₄ from weight loss measurement. Weight loss, potentiodynamic polarization, and scanning electron microscopy tests confirm the inhibitive performance of this compound and the increase in inhibitor efficiency increases with inhibitor concentration. The polarization data showed that the inhibitor acts as a mixed-type inhibitor, and fits the Langmuir adsorption isotherm. The adsorption studies clarify the excellent adsorption of this compound on the mild steel surface. The inhibited steel in the acid solution displayed improved surface morphology due to the surface protection effect of CXA molecules. The citrus x aurantiifolia studied here easily mitigates the effect of stress corrosion cracking on mild steel in a sulphuric acid environment. Keywords: Mild steel, Stress corrosion, Adsorption, Corrosion inhibitor, Sulphuric acid, Citrus X Aurantiifolia

Abstract: The corrosion inhibition effect of Cocos nucifera (CN) surfactant inhibitor, has been inspected on 316L steel in 5 M HCl and H₂SO₄ solutions by weight loss (WL) method. The results revealed that the presence of alkanols, glycosides, steroids and terpenoids in CN surfactant supported the inhibitor by retarding corrosion effect to give an optimum inhibition efficiency of 93.71% in HCl and 89.66% in H₂SO₄ solutions after 504 h. Also, the regression values for both acidic solutions were close to unity after obeying Langmuir isotherm adsorption mechanism with 0.9971 for HCl and 0.9882 for H₂SO₄ solution. The result confirms that CN surfactant inhibitor performed better in HCl solution than in H₂SO₄ solution. Keywords: Corrosion inhibitor; active components; austenitic 316L material; weight loss method; adsorption isotherm.

Abstract: Multilayer angle pieces are used to protect end parts and edges of rolls and packs of various sheet materials, including metals, during transportation and storage. Waxed protective angle pieces applied in metal products packaging may cause allergic reactions of personnel. The paper presents a chemical analysis of cover layer of multilayer waxed protective angle pieces based on cardboard. It was found that the cover layer contains nitrite ions. They can induce allergic itching. Temperature characteristics of the components that make up the cover layer were determined by the method of synchronous thermal analysis. X-ray microanalysis detected carbon, oxygen, calcium and silicon in this layer. IR spectra of the cover layer has revealed the presence of oxygen-and nitrogen-containing functional groups. The research of the multilayer protective angle pieces for metal products packaging has shown nonconformity with the specifications for this type of goods. The cover layer of the angle pieces contains distillate slack wax, nitrogen-bearing corrosion inhibitors. The angle pieces calls for protection measures when packaging metal products.