scholarly journals Model for the Correlation between Anodic Dissolution Resistance and Crystallographic Texture in Pipeline Steels

Materials ◽  
2018 ◽  
Vol 11 (8) ◽  
pp. 1432 ◽  
Author(s):  
Manuel Madrigal-Cano ◽  
Luis Hernández-Maya ◽  
José Hallen ◽  
Mónica Corrales-Luna ◽  
Elsa Arce-Estrada ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Crystallographic Texture ◽  
Harmonic Functions ◽  
Electrochemical Impedance ◽  
Resistance Index ◽  
American Petroleum Institute ◽  
Materials Selection ◽  
The Relationship ◽  
Spherical Harmonic Functions ◽  
Good Agreement

This paper presents a novel physical–mathematical model to describe the relationship between the crystallographic texture and corrosion behavior of American petroleum institute (API) 5L steels. Symmetric spherical harmonic functions were used to estimate the material’s corrosion resistance from crystallographic texture measurements. The predictions of the average corrosion resistance index made from the crystallographic texture were in good agreement with those obtained from potentiodynamic polarization and electrochemical impedance spectroscopy measurements for the studied steels. This agreement validates the capacity of this model and opens the possibility of applying it as a novel criterion for materials selection and design stages to combat corrosion problems.

Effect of Immersion Time on Corrosion Resistance of Phytic Acid Coatings on AZ91D-Mg Alloy

2011 ◽  
Vol 105-107 ◽  
pp. 1653-1656 ◽  
Author(s):  
Bi Lan Lin ◽  
Yu Ye Xu ◽  
Wei Su
Keyword(s):  
Corrosion Resistance ◽  
Electrochemical Impedance Spectroscopy ◽  
Phytic Acid ◽  
Immersion Time ◽  
Electrochemical Impedance ◽  
Resistance Index ◽  
Electrochemical Corrosion ◽  
Mg Alloy ◽  
Protection Efficiency ◽  
Tafel Polarization

Phytic acid coatings were formed on AZ91D-Mg alloy during immersion in 5.0 g/L phytic acid solution for different time. The corrosion resistance of the bare and coated samples was investigated using Tafel polarization and Electrochemical Impedance Spectroscopy (EIS) methods, and the corresponding electrochemical corrosion parameters were analyzed. The results show that the anodic and cathodic corrosion processes of AZ91D-Mg alloy are conspicuously inhibited with phytic acid coatings; the overall corrosion resistance index of AZ91D-Mg alloy is increased with immersion time; and the corrosion protection efficiency of phytic acid coatings is up to 97.8%.

Corrosion Behavior of HRB400 Reinforcing Steel Based on Electrochemical Impedance Spectroscopy

2011 ◽  
Vol 105-107 ◽  
pp. 1797-1800
Author(s):  
Yu Ye Xu ◽  
Bi Lan Lin
Keyword(s):  
Corrosion Resistance ◽  
Electrochemical Impedance Spectroscopy ◽  
Impedance Spectroscopy ◽  
Corrosion Behavior ◽  
Electrochemical Impedance ◽  
Resistance Index ◽  
Chloride Ions ◽  
Reinforcing Steel ◽  
Kinetics Parameters ◽  
Transfer Resistance

Electrochemical impedance spectroscopy (EIS) technique was used to investigate the corrosion behavior of HRB400 reinforcing steel in Simulated Concrete Pore (SCP) solutions differently contaminated by bicarbonate ions and/or chloride ions. The corrosion kinetics parameters of the capacitance Y0-CPEdl, surface roughness n0-CPEdl and charge transfer resistance Rct of the electric double-layer capacitance of the interface of solution/HRB400 were analyzed and were compared to those of HPB235 reinforcing steel. The results show that the corrosion resistance index of HRB400 and HPB235 is increased with an increase in NaCl content to 0.1%, but that is decreased markedly for a larger NaCl content; and that of them is decreased largely with an increase in pH; the decrease extent of the corrosion resistance index of HRB400 with NaCl or pH is larger than that of HPB235; and the corrosion resistance of HRB400 is inferior to that of HPB235.

Influence of Roughness on Corrosion Resistance of Carbon Steel SAE 1020 and DOMEX® 700 MC Steel

2020 ◽  
Vol 1012 ◽  
pp. 441-446
Author(s):  
Yuji de Araújo Takahashi ◽  
Everson do Prado Banczek ◽  
Viviane Teleginski Mazur ◽  
Sílvia do Nascimento Rosa
Keyword(s):  
Corrosion Resistance ◽  
Carbon Steel ◽  
Electrochemical Impedance ◽  
Metal Alloys ◽  
Surface Conditions ◽  
Electrochemical Tests ◽  
Lower Maximum ◽  
Steel Surfaces ◽  
The Relationship ◽  
Scanning Electron

The aim of this study was to investigate and compare the relationship between corrosion resistance and roughness in the samples of carbon steel SAE 1020 and DOMEX® 700 MC steel. Surfaces with different roughnesses were compared. The metal alloys were analyzed via electrochemical impedance spectroscopy (EIS), anodic potentiodynamic polarization (APP), roughness tester and scanning electron microscopy (SEM). It was observed that the samples exhibited different behavior with respect to corrosion resistance, according to the surface conditions and materials that were tested. The lowest roughness values represented the best results in the electrochemical tests. The samples of carbon steel with lower maximum depth of valleys (Rv) showed the best protection properties compared to other samples.

scholarly journals Electroless Deposition of Ni-Cu-P Coatings Containing Nano-Al2O3Particles and Study of Its Corrosion Protective Behaviour in 0.5 M H2SO4

2014 ◽  
Vol 2014 ◽  
pp. 1-9 ◽  
Author(s):  
H. Ashassi-Sorkhabi ◽  
H. Aminikia ◽  
R. Bagheri
Keyword(s):  
Corrosion Resistance ◽  
Electrochemical Impedance ◽  
Corrosion Behaviour ◽  
Composite Coatings ◽  
Electrochemical Methods ◽  
Sem Images ◽  
Corrosion Properties ◽  
Plating Bath ◽  
Nanoparticles Concentration ◽  
Good Agreement

Ni-Cu-P/nano-Al2O3composite coatings are prepared on mild steel from an alkaline electroless plating bath containing different concentrations of Al2O3nanoparticles. The protective effect of codeposited nanoparticles on the corrosion behaviour of the coatings is studied in 0.5 M H2SO4solution. The electrochemical methods, that is, electrochemical noise (ECN), electrochemical impedance spectroscopy (EIS), and polarization measurements, are used to characterize the corrosion properties of the coatings. The results show that the inclusion of nanosized particles leads to significant improvement of corrosion resistance of the coatings. The highest corrosion resistance is obtained at 20 ppm of nanoparticles concentration in the plating bath. The ECN measurements results are in good agreement with results obtained from two other electrochemical methods after trend removal. The SEM images prove that nano-Al2O3particles were embedded in the Ni-Cu-P matrix and are dispersed uniformly on the coating surface.

Effect of Sn Addition on the Corrosion Performance of Cast X-52 in H2S-Containing Environment at 60°C

2013 ◽  
Vol 743-744 ◽  
pp. 607-612 ◽  
Author(s):  
Hong Liang Lin ◽  
Jian Qiu Wang ◽  
En Hou Han
Keyword(s):  
Corrosion Resistance ◽  
Corrosion Rate ◽  
Electrochemical Impedance ◽  
Corrosion Current ◽  
Corrosion Performance ◽  
Positive Role ◽  
Surface Corrosion ◽  
The Matrix ◽  
The Relationship ◽  
Small Content

The electrochemical behavior of cast X-52 with different Sn content ranging from 0 to 1 wt. % was investigated using the methods of potentiodynamic test, electrochemical impedance spectroscopy (EIS). The immersion tests involved to examine the relationship between Sn addition and corrosion performance of cast X-52. In addition, the morphology and the compositions of surface corrosion products were analyzed using scanning electron microscope (SEM)/ energy dispersive spectroscopy (EDS). Potentiodynamic polarization curves showed that the presence of Sn decreased the corrosion current density. EIS indicated that Sn-containing steels had higher polarization resistances. These results confirmed that Sn played a positive role in reducing corrosion rate in H2S-containing environment. However, the corrosion resistance decreased with increasing Sn addition. It was proved that Sn improved the corrosion resistance with only a small content and large amount of Sn might lead to an advance of the pit due to occurrence of more acidification. Moreover, a continuous inner O-rich layer adherent to the matrix was found for Sn-addition samples, which lead to a decrease of corrosion rate due to its compact characteristic, compared with porous sulfide formed on the outer surface.

scholarly journals Model for the Correlation between Anodic Dissolution Resistance and Crystallographic Texture in API 5L Steels

2018 ◽  
Author(s):  
Manuel Madrigal-Cano ◽  
Luis Hernández-Maya ◽  
José M. Hallen ◽  
Mónica Corrales-Luna ◽  
Elsa M. Arce-Estrada ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Anodic Dissolution ◽  
Crystallographic Texture ◽  
Material Selection ◽  
Spherical Surface ◽  
Resistance Index ◽  
Metal Corrosion ◽  
X Ray Diffraction ◽  
Texture Surface ◽  
Bcc Structure

The present work shows a novel physical-mathematical model to estimate the average corrosion resistance index from the crystallographic texture in API 5L steels. The crystallographic texture of the studied steels was measured by means of the X-ray diffraction technique. The model, based on the symmetric spherical surface harmonics for a BCC structure, is capable of describing the anisotropy surface of anodic dissolution resistance of the crystal and establishing a straightforward relationship between crystallographic texture, surface roughness, and metal corrosion behavior. The predictions of the average corrosion resistance index made from the crystallographic texture were in good agreement with those obtained from potentiodynamic polarization curves for the investigated steels. This agreement validates the capacity of this model and opens the possibility of applying it as a novel criterion for the material selection and design stages in order to combat metal corrosion problems.

Matrix method of investigation of the cosmic-ray distribution

1968 ◽  
Vol 46 (10) ◽  
pp. S959-S961 ◽  
Author(s):  
G. F. Krymsky ◽  
P. A. Krivoshapkin ◽  
A. I. Kuzmin
Keyword(s):  
Magnetic Field ◽  
Spatial Orientation ◽  
Spherical Harmonic ◽  
Harmonic Functions ◽  
Cosmic Ray ◽  
Diurnal Variations ◽  
Directional Distribution ◽  
Expansion Coefficients ◽  
The Relationship ◽  
Spherical Harmonic Functions

The cosmic-ray directional distribution is expanded in a series of spherical harmonic functions. Matrices are introduced which modify the expansion coefficients for rotation of the coordinate system. The relationship between the expansion coefficients and diurnal variations is established. The mechanism generating the second spherical harmonic due to cosmic-ray screening by regular magnetic fields is discussed, and the parameters of the corresponding diurnal and semidiurnal variations depending on the spatial orientation of the interplanetary magnetic field are calculated.

scholarly journals Aplicación de una metodología mixta para la selección de materiales resistentes a la corrosión en medios ácidos y salinos

Respuestas ◽  
2015 ◽  
Vol 20 (1) ◽  
pp. 112
Author(s):  
Andrey Felipe Mahecha-Gómez ◽  
Claudia Patricia Mejía-Villagrán ◽  
Jhon Jairo Olaya-Flórez
Keyword(s):  
Corrosion Resistance ◽  
Electrochemical Impedance ◽  
Aisi 316L ◽  
Materials Selection ◽  
Corrosive Media ◽  
Aisi 304L ◽  
Steel Aisi ◽  
Aisi 316 ◽  
Para Determinar ◽  
Lower Corrosion Rate

Objetivo: En este artículo se presenta una metodología mixta de selección de materiales para determinar qué material presenta la mejor relación entre resistencia a la corrosión, propiedades mecánicas y costos. Metodología: El trabajo se llevó a cabo utilizando pruebas potenciodinámicas de extrapolación (Tafel) e impedancia electroquímica (EIS), sometiendo las muestras a medios corrosivos de NaCl (3%) y H2SO4 (5%). Las muestras utilizadas fueron el cerámico Zirconia no sinterizada y los aceros AISI 304L, AISI 316 y AISI 316L. Finalmente se aplicó una metodología de selección de materiales para escoger el material que presenta mejor comportamiento en este tipo de medios. Resultados: Como resultado, para las pruebas de extrapolación Tafel con 5% de ácido sulfúrico (H2SO4), se obtuvo que el acero AISI 316 presenta la corriente de corrosión más baja y una pasivación a mayor potencia. En el medio electrolítico con 3%de NaCl, se observa que los valores de potencial de corrosión más altos se presentan en los aceros inoxidables, evidenciándose una menor velocidad de corrosión en los aceros de la serie 316. Conclusiones: Como resultado se obtuvo que el acero AISI 316 utilizado presenta el mejor comportamiento de resistencia a la corrosión en los medios Medios ácidos y salinos.Abstract Objective: This article presents a mixed materials selection methodology is presented to determine which material has the best balance between corrosion resistance, mechanical properties and costs. Methods: The work was realized using potentiodynamic tests of extrapolation (Tafel) and electrochemical impedance (EIS), subjecting the samples to corrosive media of NaCl (3%) and H2SO4 (5%). The samples used were zirconia, steel AISI 304L, AISI 316 and AISI 316L. Finally a mixed methodology was applied in the materials selection to choose the material that has better comportment in this type of electrolyte. Results: For Tafel extrapolation test with 5% sulfuric acid (H2SO4) was obtained that AISI 316 steel which has the lowest current corrosion and passivation at higher power. In the electrolytic medium with 3 % NaCl, shows that higher values for corrosion potential present in stainless steels, showing a lower corrosion rate in the steels of the 316 series. Conclusions: The results showed that steel AISI 316 used presents the best performance to corrosion resistance in saline and acid.Palabras claves: Corrosión, Medios ácidos y salinos, Metodología mixta, Selección de materiales.

scholarly journals Experimental studies on the transformation from firn to ice in the wet-snow zone of temperate glaciers

1997 ◽  
Vol 24 ◽  
pp. 181-185 ◽  
Author(s):  
Katsuhisa Kawashima ◽  
Tomomi Yamada
Keyword(s):  
Experimental Studies ◽  
Ice Formation ◽  
Compression Tests ◽  
Densification Rate ◽  
Overburden Pressure ◽  
Proportionality Constant ◽  
Wet Snow ◽  
Water Saturated ◽  
The Relationship ◽  
Good Agreement

The densification of water-saturated firn, which had formed just above the firn-ice transition in the wet-snow zone of temperate glaciers, was investigated by compression tests under pressures ranging from 0.036 to 0.173 MPa, with special reference to the relationship between densification rate, time and pressure. At each test, the logarithm of the densification rate was proportional to the logarithm of the time, and its proportionality constant increased exponentially with increasing pressure. The time necessary for ice formation in the firn aquifer was calculated using the empirical formula obtained from the tests. Consequently, the necessary time decreased exponentially as the pressure increased, which shows that the transformation from firn in ice can be completed within the period when the firn aquifer exists, if the overburden pressure acting on the water-saturated firn is above 0.12–0.14 MPa. This critical value of pressure was in good agreement with the overburden pressure obtained from depth–density curves of temperate glaciers. It was concluded that the depth of firn–ice transition was self-balanced by the overburden pressure to result in the concentration between 20 and 30 m.

scholarly journals Hydrophobic Modification of Graphene Oxide and Its Effect on the Corrosion Resistance of Silicone-Modified Epoxy Resin

Metals ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 89
Author(s):  
Wei Yuan ◽  
Qian Hu ◽  
Jiao Zhang ◽  
Feng Huang ◽  
Jing Liu
Keyword(s):  
Contact Angle ◽  
Corrosion Resistance ◽  
Graphene Oxide ◽  
Physical Properties ◽  
Epoxy Resin ◽  
Electrochemical Impedance ◽  
Salt Spray ◽  
X Ray ◽  
Modified Graphene Oxide ◽  
Modified Epoxy

This study modified graphene oxide (GO) with hydrophilic octadecylamine (ODA) via covalent bonding to improve its dispersion in silicone-modified epoxy resin (SMER) coatings. The structural and physical properties of ODA-GO were characterized by field-emission scanning electron microscopy (FE-SEM), X-ray diffraction analysis (XRD), Fourier transform infrared spectroscopy (FT-IR), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), and contact angle tests. The ODA-GO composite materials were added to SMER coatings by physical mixing. FE-SEM, water absorption, and contact angle tests were used to evaluate the physical properties of the ODA-GO/SMER coatings, while salt spray, electrochemical impedance spectroscopy (EIS), and scanning Kelvin probe (SKP) methods were used to test the anticorrosive performance of ODA-GO/SMER composite coatings on Q235 steel substrates. It was found that ODA was successfully grafted onto the surfaces of GO. The resulting ODA-GO material exhibited good hydrophobicity and dispersion in SMER coatings. The anticorrosive properties of the ODA-GO/SMER coatings were significantly improved due to the increased interfacial adhesion between the nanosheets and SMER, lengthening of the corrosive solution diffusion path, and increased cathodic peeling resistance. The 1 wt.% ODA-GO/SMER coating provided the best corrosion resistance than SMER coatings with other amounts of ODA-GO (including no addition). After immersion in 3.5 wt.% NaCl solution for 28 days, the low-frequency end impedance value of the 1 wt.% ODA-GO/SMER coating remained high, at 6.2 × 108 Ω·cm2.

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