Portugaliae Electrochimica Acta最新文献_第8页

Potential of Composite Incorporation on the Mechanical Behavior of Multilayer Coatings 复合材料掺入对多层涂层力学性能的影响

IF 1.2

Portugaliae Electrochimica Acta Pub Date : 2021-01-01 DOI: 10.4152/pea.2021390301

O. Joseph, O. Fayomi, A. O. Inegbenebo, A. Ayoola

{"title":"Potential of Composite Incorporation on the Mechanical Behavior of Multilayer Coatings","authors":"O. Joseph, O. Fayomi, A. O. Inegbenebo, A. Ayoola","doi":"10.4152/pea.2021390301","DOIUrl":"https://doi.org/10.4152/pea.2021390301","url":null,"abstract":"In this paper, the performance of a composite particle for the deposition of ZnO/Cr2O3 on a zinc electrolyte was examined. Its susceptibility to corrosion in 3.5% NaCl, using linear polarization, was investigated. The developed crystal was characterized by using scanning electron microscope (SEM) equipped with an energy dispersive spectrometer (EDS). The strengthening properties of the coated samples, i.e. the mechanical response, were studied using a high sensitive diamond microhardness indenter and a MTR-300 rigid wear tester. From the results, the effect of the composite coatings interestingly influenced the performance regarding microhardness, durability, corrosion mitigation and wear damage. In general, the micro-hardness value for the Zn-ZnO material was 125.0 HVN, while it was 130.5 HVN for Zn-8ZnO-16Cr2O3 composite coating. For Zn-8ZnO-20Cr2O3, a better hardness performance was noted with 138.0 HVN. From the wear study, Zn-8ZnO shows 0.018 g/min dissociation against the counter body with the best wear performance obtained at 0.005 g/min. The corrosion properties of the developed composite coating also tend towards a more positive region, with a corrosion rate of 0.850 mm/yr. This shows that the role of composite particulates maximally contributes to improve the strengthening characteristics of the developed coating.","PeriodicalId":20334,"journal":{"name":"Portugaliae Electrochimica Acta","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70918544","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Potentiometric Determination of Oxymetazoline Hydrochloride Using Modified Carbon Paste Electrodes 修饰碳糊电极电位法测定盐酸羟美唑啉

IF 1.2

Portugaliae Electrochimica Acta Pub Date : 2021-01-01 DOI: 10.4152/pea.2021390505

Y. M. Issa, M. Khalil, S. I. Zayed, N. Mustafa

引用次数: 0

Corrosion Inhibition Potential of Ethanol Extract of Acacia nilotica Leaves on Mild Steel in an Acidic Medium 刺槐叶乙醇提取物在酸性介质中对低碳钢的缓蚀性能

IF 1.2

Portugaliae Electrochimica Acta Pub Date : 2021-01-01 DOI: 10.4152/pea.202102105

I. Jimoh, B. Usman

{"title":"Corrosion Inhibition Potential of Ethanol Extract of Acacia nilotica Leaves on Mild Steel in an Acidic Medium","authors":"I. Jimoh, B. Usman","doi":"10.4152/pea.202102105","DOIUrl":"https://doi.org/10.4152/pea.202102105","url":null,"abstract":"The corrosion inhibition effect of ethanol extract of Acacia nilotica leaves (ANLE) on mild steel in 0.1 M H2SO4, containing 0.1-0.5 g/L, has been studied using weight loss, Potentiodynamic Polarization (PDP), Fourier Transforms Infra-Red (FTIR) spectroscopy, UV-visible spectroscopy, High-Performance Liquid Chromatography (HPLC) and Scanning Electron Microscopy (SEM) methods. The results from weight loss and PDP show that the inhibition efficiency depends on the concentration of the plant extract, as well as on the time of exposure of the mild steel samples in H2SO4 solutions. The optimum inhibition efficiencies of the extract obtained from weight loss and potentiodynamic measurements were found to be 87.57% and 61.85%, respectively. Thermodynamic parameters, such as Ea, ΔH, ΔG and ΔS, were evaluated at 0.5 g/L, and the results were found to be -78.54 kJ/mol, 74.66 kJ/mol., -17.92 kJ/mol and -90.59 kJ/mol, respectively. From the calculated values of activation energy and free energy of adsorption, and from the trend in the variation of inhibition efficiency with temperature, the inhibitor mechanism of adsorption was found to be physical adsorption, exothermic, spontaneous, being best described by Langmuir adsorption model, because the regression coefficients (R) values calculated from the plots were closest to unity, confirming a highest degree of linearity. Mild steel surface morphology, in ANLE presence and absence, was studied using SEM. FTIR spectroscopy and UV-visible spectroscopy analyses were used to confirm the adsorption process onto the metal surface. Spectra analysis obtained from FTIR study indicated that ANLE was adsorbed onto the mild steel surface via C-O and N=O functional groups. HPLC was also used to find the main component responsible for inhibition, at 5.990 min, which was Catechin. The obtained results revealed that ANLE acts as a good inhibitor and could serve as an effective mild steel corrosion inhibitor in a 0.1 M H2SO4 solution.","PeriodicalId":20334,"journal":{"name":"Portugaliae Electrochimica Acta","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70918524","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5

Continuous Flow Electrocoagulation as a Hospital Wastewater Treatment 连续流电凝在医院废水处理中的应用

IF 1.2

Portugaliae Electrochimica Acta Pub Date : 2021-01-01 DOI: 10.4152/pea.2021390602

A. Yanes, J. Pinedo‐Hernández, J. Marrugo-Negrete

引用次数: 4

Corrosion Inhibition of Mild Steel Using Parinari polyandra Leave Extracts in Diluted Hydrochloric Acids 沉叶提取物在稀释盐酸中对低碳钢的缓蚀作用

IF 1.2

Portugaliae Electrochimica Acta Pub Date : 2021-01-01 DOI: 10.4152/pea.2021390605

F. O. Nwosu, S. O. Amusat

{"title":"Corrosion Inhibition of Mild Steel Using Parinari polyandra Leave Extracts in Diluted Hydrochloric Acids","authors":"F. O. Nwosu, S. O. Amusat","doi":"10.4152/pea.2021390605","DOIUrl":"https://doi.org/10.4152/pea.2021390605","url":null,"abstract":"Metallic materials remain an indispensable element in industries. The present study is aimed at the assessment of Parinari polyandra leaves inhibition properties on mild steel in a 1 M HCl solution. This was investigated using gravimetric and electrochemical methods. Physicochemical and spectroscopic analyses of the leaves extract were done using standard methods. A yield of 19.82% was obtained, while the leaves extract FTIR spectra showed bands of 3404 cm -1 and 2926 cm -1 , which indicated the presence of a strong band of phenolic O-H and C-H stretch functional groups, respectively. A maximum corrosion inhibition efficiency of 97.22% was obtained. Langmuir adsorption isotherm fitted the inhibitor data well. From electrochemical methods, the corrosion rate value of 17.626 mmpy obtained for the uninhibited mild steel was higher than 0.02044 – 2.2267 mmpy range values recorded for the mild steel surface covered with P. polyandra leaves extract in an acidic medium. SEM images showed the leaves extract inhibition effect against mild steel corrosion in a 1 M HCl solution. Electrochemical analysis using the Tafel plot also showed the leaves extract corrosion inhibition capacity, suggesting a mixed type inhibitor. Thus, P. polyandra leaves extract might act as a green corrosion inhibitor for mild steel utilized in industrial applications.","PeriodicalId":20334,"journal":{"name":"Portugaliae Electrochimica Acta","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70919299","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Structural concrete failures in developing countries: overview about the effects of mixing water on concrete properties 发展中国家结构混凝土失效:拌和水对混凝土性能影响的综述

IF 1.2

Portugaliae Electrochimica Acta Pub Date : 2021-01-01 DOI: 10.4152/pea.202101021

A. Awoyera, A. Adesina

引用次数: 0

Gymneme Sylvestre as a Green Corrosion Inhibitor for Aluminum in an Acidic Medium 金缕梅在酸性介质中作为铝的绿色缓蚀剂

IF 1.2

Portugaliae Electrochimica Acta Pub Date : 2021-01-01 DOI: 10.4152/pea.2021390304

Bashir, V. Sharma, P. Dhaundiyal, N. Shafi, Ashok Kumar

引用次数: 4

Atomic Absorption Spectroscopy Reveals Anomalous Transfer of Heavy Metal across a Water/1,2-DCE Interface 原子吸收光谱揭示了重金属在水/1,2- dce界面上的异常转移

IF 1.2

Portugaliae Electrochimica Acta Pub Date : 2021-01-01 DOI: 10.4152/pea.2021390603

B. R. Silver

引用次数: 2

Electrochemical Investigation on the Acid Corrosion Control of Mild Steel using Biopolymer as an Inhibitor 生物聚合物缓蚀剂对低碳钢酸腐蚀控制的电化学研究

IF 1.2

Portugaliae Electrochimica Acta Pub Date : 2020-02-01 DOI: 10.4152/pea.202003149

Y. Sushmitha, P. Rao

{"title":"Electrochemical Investigation on the Acid Corrosion Control of Mild Steel using Biopolymer as an Inhibitor","authors":"Y. Sushmitha, P. Rao","doi":"10.4152/pea.202003149","DOIUrl":"https://doi.org/10.4152/pea.202003149","url":null,"abstract":"The present work highlights the results of the application of a green inhibitor for material conservation. The anticorrosive performance of the pectin bio-polymer was established for the corrosion control of mild steel in a 1 M phosphoric acid medium. Electrochemical measurements such as potentiodynamic polarization (PDP) and electrochemical impedance spectroscopy (EIS) studies were adopted for the corrosion inhibition studies. The studies were carried out by varying the concentrations of pectin in the temperature range from 303 K to 318 K. Conditions were optimized to get maximum inhibition efficiency. The surface morphology study was done by scanning electron microscope (SEM), and elemental mapping was done using energy dispersive X-ray (EDX) studies to confirm the adsorption and interaction of the inhibitor with the material. Studies showed an increase in the inhibition efficiency with an increase in the concentration of pectin and also in the temperature. Maximum inhibition efficiency of 70% was achieved by the addition of 800 ppm of inhibitor. Pectin acted as a mixed type inhibitor by bringing down both cathodic and anodic reactions. Kinetic and thermodynamic parameters revealed chemical adsorption of pectin onto the mild steel surface. A suitable mechanism was proposed for the adsorption of pectin which was reaffirmed by the surface morphology studies. Pectin emerged as a potential eco-friendly green inhibitor for the corrosion control of mild steel, with economic benefits.","PeriodicalId":20334,"journal":{"name":"Portugaliae Electrochimica Acta","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2020-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48274606","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Mild Steel Corrosion Inhibition, in 4 N Sulphuric Acid, by a Green Inhibitor 绿色缓蚀剂对低碳钢在4n硫酸中的缓蚀作用

IF 1.2

Portugaliae Electrochimica Acta Pub Date : 2020-01-01 DOI: 10.4152/pea.202002099

M. Srivastava

{"title":"Mild Steel Corrosion Inhibition, in 4 N Sulphuric Acid, by a Green Inhibitor","authors":"M. Srivastava","doi":"10.4152/pea.202002099","DOIUrl":"https://doi.org/10.4152/pea.202002099","url":null,"abstract":"Use of Amaranthus extract, as mild steel corrosion inhibitor, in a p ickling paste with H2SO4, has been investigated. The electrochemical experim ents were conducted to bring forth results regarding various parameters, viz., c orrosion current, anodic polarization and cathodic polarization. The corrosion current gr adually decreased with time, for both uninhibited and inhibited systems. Polarization cur ves values indicate that Amaranthus extract adsorption modified anodic dissolution mech anism, as well as cathodic hydrogen evolution. From the results, it is clear t hat both cathodic and anodic reactions were inhibited, and that inhibition increased as th e inhibitor concentration increased in acidic media, but the cathode was more polarized. T his result indicated that Amaranthus extract can be classified as a cathodic inhibitor, in a 4 N H2SO4 solution. Surface analysis via scanning electron microscope (SEM) sho wed a significant improvement on the mild steel plate surface morphology, in the pre sence of optimum inhibitor concentrations. Thus, by conducting these experimen ts, our aim is to use inhibited pickling acid in the paste form, so that it can be conveniently applied on large structures, as well as on small tools, to be pickle d/c aned. As a contribution to the current interest on environmentally friendly green corrosion inhibitors, the present study investigates the inhibiting effect of Amaranthus extract, a green inhibitor which is commonly known as Pigweed.","PeriodicalId":20334,"journal":{"name":"Portugaliae Electrochimica Acta","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70917608","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1