Effect of the sample form on the corrosion behavior of steels for concrete in 3% NaCl medium

Corrosion of steel constitutes a major preoccupation in the field of civil engineering and the building sector. In this paper, we investigated the electrochemical behavior of two steel specimens with different forms (latched steel and smooth steel) in a 3 wt.% NaCl solution. For this purpose, we studied the steel samples by linear polarization, potentiodynamic polarization and electrochemical impedance spectroscopy (EIS). The surface morphologies of the substrates were examined by scanning electron microscopy coupled with energy diffraction spectroscopy (SEM/EDS). Results of linear polarization, Tafel polarization curves and EIS show that latched steel (LS) is more susceptible to corrosion than smooth steel (SS) in saline solution. Gravimetric and SEM/EDS analysis after 10 days of immersion confirmed the results obtained by electrochemical methods. All of our results are in agreement and demonstrate that the sample form plays a key role in corrosion resistance.

Download Full-text

Study on Corrosion Behavior of Al-Zn-In and Al-Zn-Ga Alloys in NaCl Solution

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.284-286.1701 ◽

2011 ◽

Vol 284-286 ◽

pp. 1701-1704

Author(s):

Jing Ling Ma ◽

Jiu Ba Wen ◽

Gao Lin Li

Keyword(s):

Electron Microscopy ◽

Scanning Electron Microscopy ◽

Electrochemical Impedance Spectroscopy ◽

Corrosion Behavior ◽

Electrochemical Impedance ◽

Nacl Solution ◽

X Ray ◽

Inductive Loop ◽

Capacitive Loop ◽

Scanning Electron

The corrosion behavior of Al-5Zn-0.03In and Al-5Zn-0.03Ga alloys in 3.5 % NaCl solution has been examined by electrochemical methods, scanning electron microscopy, X-ray microanalysis, electrochemical impedance spectroscopy. The results demonstrate that the alloys differ in the microstructure, corroded morphology and electrochemical properties. For Al-5Zn-0.03In alloy, the precipitates enriched in Al and Zn initiates pitting. For Al-5Zn-0.03Ga alloy, corrosion occurs more uniformly, the corrosion of the alloy occurred via the formation of a surface Ga-Al amalgam alloy. The EIS of Al-5Zn-0.03In alloy contains a capacitive loop and an inductive loop; the inductive loop can be attributed to the presence of the pitting. The EIS of Al-5Zn-0.03Ga alloy contains only a capacitive loop.

Download Full-text

Effect of KI on the Corrosion Resistance of Ni-P Electroless Plating Coating

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.633-634.817 ◽

2014 ◽

Vol 633-634 ◽

pp. 817-820

Author(s):

Ping Liang ◽

Yun Xia Zhang ◽

Yan Hua Shi

Keyword(s):

Electron Microscopy ◽

Scanning Electron Microscopy ◽

Corrosion Resistance ◽

Electrochemical Impedance Spectroscopy ◽

Impedance Spectroscopy ◽

Phosphorus Content ◽

Electrochemical Impedance ◽

Nacl Solution ◽

Electroless Coating ◽

Scanning Electron

To improve the corrosion resistance of Ni-P electroless coating, the KI was added in the electroless solution. The surface micrograph was observed using scanning electron microscopy (SEM), and the corrosion resistance of Ni-P coatings in 3.5%NaCl solution was examined by polarization curves and electrochemical impedance spectroscopy (EIS). The experimental results showed that KI reduced the amount of defects and the size of crystal grain of Ni-P coating, and the surface of Ni-P coating became more homogenous, smoother and compact by KI. In addition, the phosphorus content of Ni-P coating was increased by KI. These factors increased the ability to corrosion protection of Ni-P coating.

Download Full-text

Sem Studies of Co-Cr-Mo Surgical Implant Alloy Corrosion Behavior

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100055448 ◽

1982 ◽

Vol 40 ◽

pp. 520-521

Author(s):

Ann Chidester Van Orden ◽

John L. Chidester ◽

Anna C. Fraker ◽

Pei Sung

Keyword(s):

Electron Microscopy ◽

Corrosion Behavior ◽

Anodic Polarization ◽

Saline Solution ◽

Saturated Calomel Electrode ◽

Physiological Saline ◽

X Ray ◽

Physiological Saline Solution ◽

Scanning Electron

The influence of small variations in the composition on the corrosion behavior of Co-Cr-Mo alloys has been studied using scanning electron microscopy (SEM), energy dispersive x-ray analysis (EDX), and electrochemical measurements. SEM and EDX data were correlated with data from in vitro corrosion measurements involving repassivation and also potentiostatic anodic polarization measurements. Specimens studied included the four alloys shown in Table 1. Corrosion tests were conducted in Hanks' physiological saline solution which has a pH of 7.4 and was held at a temperature of 37°C. Specimens were mechanically polished to a surface finish with 0.05 µm A1203, then exposed to the solution and anodically polarized at a rate of 0.006 v/min. All voltages were measured vs. the saturated calomel electrode (s.c.e.).. Specimens had breakdown potentials near 0.47V vs. s.c.e.

Download Full-text

Pottery production in a limestone-poor region of the Maya lowlands: Thin section petrography and scanning electron microscopy-energy dispersive spectrometry (SEM-EDS) analysis on pottery from Uxbenká, southern Belize

Journal of Archaeological Science Reports ◽

10.1016/j.jasrep.2020.102371 ◽

2020 ◽

Vol 32 ◽

pp. 102371 ◽

Cited By ~ 1

Author(s):

Jillian M. Jordan ◽

Keith M. Prufer

Keyword(s):

Electron Microscopy ◽

Scanning Electron Microscopy ◽

Thin Section ◽

Energy Dispersive Spectrometry ◽

Pottery Production ◽

Maya Lowlands ◽

Eds Analysis ◽

Poor Region ◽

Thin Section Petrography ◽

Scanning Electron

Download Full-text

Scanning Electron Microscopy Coupled with Energy Dispersive Spectrometric Analysis Reveals for the First Time Weddellite and Sylvite Crystals on the Surface of Involucral Bracts and Petals of two Xeranthemum L. (Compositae) Species

Microscopy and Microanalysis ◽

10.1017/s1431927617000551 ◽

2017 ◽

Vol 23 (3) ◽

pp. 679-686 ◽

Cited By ~ 2

Author(s):

Milan Gavrilović ◽

Suzana Erić ◽

Petar D. Marin ◽

Núria Garcia-Jacas ◽

Alfonso Susanna ◽

...

Keyword(s):

Electron Microscopy ◽

Scanning Electron Microscopy ◽

Glandular Trichomes ◽

Energy Dispersive ◽

Spectrometric Analysis ◽

Eds Analysis ◽

Taxonomic Studies ◽

First Time ◽

Tetragonal Bipyramid ◽

Scanning Electron

AbstractIn this work, weddellite and sylvite crystals are identified for the first time on the involucral bracts and petals of Xeranthemum annuum and Xeranthemum cylindraceum using scanning electron microscopy coupled with energy dispersive spectrometric (SEM-EDS) analysis. Well-developed crystals of weddellite (CaC2O4·2H2O) occur in the form of a tetragonal bipyramid (hhl), rarely in combination of a bipyramid and tetragonal prism (h00). Indumentum of involucral bracts of X. cylindraceum consists of nonglandular and glandular trichomes. Sylvite (KCl) crystals are observed only on the petal surface of X. cylindraceum. The crystals of sylvite occur in the form of perfect cubes (hexahedrons), but some crystals are deformed, i.e., partially elongated. Taxonomic significance of investigated microcharacters as well as the use of SEM-EDS analysis in taxonomic studies of plants are discussed.

Download Full-text

ELECTROCHEMICAL INVESTIGATION OF 2-THIOHYDANTOIN DERIVATIVES AS CORROSION INHIBITORS FOR MILD STEEL IN ACIDIC MEDIUM

10.46793/iccbi21.157s ◽

2021 ◽

Author(s):

Petar Stanić ◽

◽

Nataša Vukićević ◽

Vesna Cvetković ◽

Miroslav Pavlović ◽

...

Keyword(s):

Electron Microscopy ◽

Mild Steel ◽

Acidic Medium ◽

Corrosion Inhibitors ◽

Electrochemical Impedance ◽

Electrochemical Investigation ◽

Force Microscopy ◽

Atomic Force ◽

Hcl Solution ◽

Scanning Electron

Four 2-thiohydantoin derivatives were synthesized and their corrosion inhibition properties on mild steel (MS) in 0.5M HCl solution was evaluated using usual gravimetric and electrochemical methods (weight loss, potentiodynamic polarization, electrochemical impedance spectroscopy (EIS). Morphology of the metal surface was characterized by scanning electron microscopy (SEM) and atomic force microscopy (AFM). The study has shown that these compounds provide good protection for mild steel against corrosion in the acidic medium.

Download Full-text

Corrosion Inhibitive Action and Adsorption Behaviour of Justicia Secunda Leaves Extract as an Eco‐Friendly Inhibitor for Aluminium in Acidic Media

Biointerface Research in Applied Chemistry ◽

10.33263/briac115.1301913030 ◽

2021 ◽

Vol 11 (5) ◽

pp. 13019-13030

Keyword(s):

Electron Microscopy ◽

Scanning Electron Microscopy ◽

Weight Loss ◽

Electrochemical Impedance ◽

Physical Adsorption ◽

Charge Transfer Resistance ◽

Aluminum Surface ◽

Protective Film ◽

Transfer Resistance ◽

Scanning Electron

The extract of Justicia secunda (JS) leaves was investigated as an eco‐friendly corrosion inhibitor of aluminum in 0.5 M HCl using weight loss, electrochemical impedance spectroscopy (EIS), potentiodynamic polarization (PDP), and scanning electron microscopy (SEM) techniques. The inhibitor concentrations used ranged from 50 to 250 ppm at 30, 40, and 50oC. Results show that Justicia secunda acts as a good inhibitor for aluminum. Its efficiency increased with increasing inhibitor concentration but decreased with increasing temperature. Maximum inhibition efficiency as high as 94.3% was found at 30°C for 250 ppm of the inhibitor with the weight loss technique. Tafel polarization results show that the extract acts as a mixed-type inhibitor. The Nyquist plots indicated decreasing double-layer capacitance and increasing charge transfer resistance on increasing JS concentration. The inhibition action occurred through the physical adsorption of the extract on the aluminum surface. The adsorption process was found to follow Langmuir adsorption isotherm. The formation of a protective film on the metal surface was confirmed by scanning electron microscopy.

Download Full-text

Tribocorrosion Behaviors of D40 Steel in Artificial Seawater

Materials Science Forum ◽

10.4028/www.scientific.net/msf.898.840 ◽

2017 ◽

Vol 898 ◽

pp. 840-848

Author(s):

Liang Shi ◽

Shao Peng Qu ◽

Hai Yan Chen ◽

Yan Sheng Yin ◽

Li Jing Yang

Keyword(s):

Electron Microscopy ◽

Oxygen Diffusion ◽

Energy Dispersive Spectrometry ◽

Diffusion Rate ◽

Corrosion Process ◽

Ion Adsorption ◽

White Light Interferometry ◽

Friction Process ◽

Surface Morphologies ◽

Scanning Electron

The friction, corrosion and tribocorrosion experiments were carried out to study the tribocorrosion characteristics of the D40 steel. Friction process was undertaken using a TriboLab. The electrochemical property of D40 steel was studied using an electrochemical workstation. The surface morphologies of the D40 steel after experiments were characterized by white light interferometry, scanning electron microscopy (SEM) and energy dispersive spectrometry (EDS). The results indicated that both the tribocorrosion and corrosion process of D40 steel under the condition of seawater were controlled by the cathodic oxygen diffusion. The diffusion rate of oxygen in the solution was accelerated by the friction. The phenomenon of Cl ion adsorption was more obvious for the D40 steel during tribocorrosion test, and the corrosion resistance was significantly reduced due to the promotion of friction.

Download Full-text

Enhancement of SEM/EDS Analysis Using FIB Sample Preparation

Microscopy and Microanalysis ◽

10.1017/s1431927600017803 ◽

1999 ◽

Vol 5 (S2) ◽

pp. 896-897

Author(s):

C.B. Vartuli ◽

F.A. Stevie ◽

J.B. Bindell ◽

T.L. Shofner ◽

B.M. Purcell

Keyword(s):

Electron Microscopy ◽

Focused Ion Beam ◽

Ion Beam ◽

Primary Electron ◽

Primary Electron Beam ◽

Interaction Volume ◽

Eds Analysis ◽

Overlapping Peaks ◽

Large Interaction ◽

Scanning Electron

Scanning Electron Microscopy/Energy Dispersive Spectroscopy (SEM/EDS) has become less useful for semiconductor samples as feature dimensions decrease. It has become increasingly difficult to get sufficient signal from small features because of the large interaction volume of the primary beam. As the interaction volume is dependent on the accelerating energy of the primary electron beam, decreasing the accelerating voltage will decrease the interaction volume. This increases the percentage of signal from the feature of interest, but also lowers the number of peaks available for interpretation, reducing the sensitivity of the analysis. Several elements commonly used in the fabrication of semiconductors have overlapping peaks at lower energies, and the ability to distinguish between them is lost at low accelerating energies. It is possible to modify samples using Focused Ion Beam (FIB) to improve EDS resolution without decreasing the accelerating voltage.The samples were prepared in an FIE 800 FIB and imaged in an Hitachi S-4700 SEM.

Download Full-text