scholarly journals In Situ Electrochemical Study of the Growth Kinetics of Passive Film on TC11 Alloy in Sulfate Solution at 300 °C/10 MPa

Materials ◽  
2020 ◽  
Vol 13 (5) ◽  
pp. 1135 ◽  
Author(s):  
Lei Zha ◽  
Heping Li ◽  
Ning Wang
Keyword(s):  
Passive Film ◽  
Growth Kinetics ◽  
Electrochemical Behavior ◽  
Electrochemical Impedance ◽  
Sulfate Solution ◽  
Open Circuit ◽  
Hydrothermal Systems ◽  
Wide Range ◽  
Kinetics Of

TC11 alloy is a promising structural material, and has a wide range of applications in many corrosive and high temperature hydrothermal systems. The passive film has an important influence on its electrochemical behavior. In this study, in-situ electrochemical methods (that is, open circuit potential (OCP), linear polarization (LP) and electrochemical impedance spectroscopy (EIS)) were used to monitor the long period electrochemical behavior of TC11 alloy in 0.01 M Na2SO4 solution at 300 °C/10 MPa. The growth kinetics of the passive film was mainly studied. The correlation between the evolution of the electrochemical behavior and the growth of the oxide film was discussed. The results showed that although the OCP gradually stabilized after twenty thousand seconds, henceforth the polarization resistance (Rp) was still increasing due to the thickening of the passive film. An equivalent circuit was proposed to fit the EIS experimental data, leading to determination of film capacitance and film resistance. Besides, the electrochemical data was interpreted in terms of the point defect model (PDM). The EIS results are consistent with the Rp results.

Electrochemical Properties of Passive Film Formed on Supermartensitic Stainless Steel in a Chloride Medium

CORROSION ◽  
10.5006/3230 ◽  
2020 ◽  
Vol 76 (9) ◽  
pp. 884-890
Author(s):  
Renata B. Soares ◽  
Wagner R.C. Campos ◽  
Pedro L. Gastelois ◽  
Waldemar A.A. Macedo ◽  
Luís F.P. Dick ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Stainless Steel ◽  
Passive Film ◽  
Electrochemical Behavior ◽  
Photoelectron Spectroscopy ◽  
Oil And Gas ◽  
Electrochemical Impedance ◽  
Passive Layer ◽  
Open Circuit ◽  
Pitting Potential

The electrochemical behavior and the electronic properties of passive films formed on a super martensitic stainless steel (SMSS) used in oil and gas industries were investigated in aqueous 0.6 M and 2.1 M NaCl solutions with additions of sodium acetate and acetic acid (pH 4.5). Open-circuit potential transients, electrochemical impedance spectroscopy, cyclic voltammetry, and x-ray photoelectron spectroscopy were measured to characterize the passive film formed on SMSS. The electrochemical behavior of the steel in an aqueous solution of 0.6 M NaCl presented the highest pitting potential and the highest polarization resistance in relation to the NaCl/NaAc solution. The passive film of SMSS in an aqueous solution of NaCl presented a thickness of 18.40 nm, three times the thickness of the oxide film in NaCl/NaAc, and consisted of FeO, Cr2O3, MoO2, and spinels such as FeCr2O4 species that are a p-type semiconductor, but may also contain a small fraction of the Fe2O3 and MoO3 oxides. Additionally, it was shown that the passive layer after immersion in a saline solution also contains hydroxides such as FeOOH and Cr(OH)3.

Some microelectrochemical methods for the investigation of passivity and corrosion

2018 ◽  
Vol 36 (1) ◽  
pp. 3-15 ◽  
Author(s):  
Koji Fushimi ◽  
Ryogo Nakagawa
Keyword(s):  
Passive Film ◽  
Electrochemical Impedance ◽  
Passive Films ◽  
Heterogeneous Distribution ◽  
Aggressive Environment ◽  
Mechanism And Kinetics ◽  
A Site ◽  
Kinetics Of ◽  
Electrochemical Microscopy

AbstractMicroelectrochemical approaches using a microcapillary cell (MCC), scanning electrochemical microscopy (SECM), and in situ ellipsomicroscopy for studying heterogeneous passive or corroding surfaces of materials are reviewed. An MCC can be used to investigate the localized behavior of a site of interest on a material by various electrochemical methods, including electrochemical impedance spectroscopy. SECM has often been used for imaging corroding surfaces or passive films on materials. Moreover, the use of a liquid-phase ion gun, a mode of SECM that forms a local aggressive environment at the solution/material interphase, can reveal the depassivation mechanism and kinetics of the surface of a material. The heterogeneous growth or degradation of a thin passive film on a material has been monitored using in situ ellipsomicroscopy, and a depassivation site has been successfully found before a film breakdown is initiated. These microelectrochemical methods are useful for monitoring the heterogeneous distribution of a passive film and for investigating the heterogeneity of the passivity of materials.

GROWTH OF OXIDE LAYER ON GERMANIUM (011) SUBSTRATE UNDER DRY AND WET ATMOSPHERES

1999 ◽  
Vol 06 (06) ◽  
pp. 1053-1060 ◽  
Author(s):  
N. TABET ◽  
J. AL-SADAH ◽  
M. SALIM
Keyword(s):  
Simple Model ◽  
Oxide Film ◽  
Growth Kinetics ◽  
Photoelectron Spectroscopy ◽  
Early Stage ◽  
X Ray ◽  
Apparent Thickness ◽  
Different Temperatures ◽  
Kinetics Of

X-ray Photoelectron Spectroscopy (XPS) has been used to investigate the oxidation of (011) Ge substrates. The sample surfaces were CP4-etched, then annealed in situ, at different temperatures, for various durations. Dry and wet atmospheres were used. The oxidation rate during the early stage was increased by the presence of moisture in the atmosphere. A simple model was used to define and determine an apparent thickness of the oxide film from XPS measurements. The time dependence of the apparent thickness is consistent with a partial coverage of the surface by oxide islands. The growth kinetics of the oxide islands obeys a nearly cubic law.

Growth kinetics of CoSi2 and Ge islands observed with in situ transmission electron microscopy

Micron ◽  
1999 ◽  
Vol 30 (1) ◽  
pp. 21-32 ◽  
Author(s):  
F.M. Ross ◽  
P.A. Bennett ◽  
R.M. Tromp ◽  
J. Tersoff ◽  
M. Reuter
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Growth Kinetics ◽  
Transmission Electron ◽  
Kinetics Of

The growth kinetics of CsPbBr3 microwires on mica: an in situ investigation

2020 ◽  
Vol 53 (23) ◽  
pp. 235105
Author(s):  
Chao Fan ◽  
Kaixi Bi ◽  
Zhiwen Shu ◽  
Xing Xu ◽  
Beibei Dai ◽  
...  
Keyword(s):  
Growth Kinetics ◽  
In Situ Investigation ◽  
Kinetics Of

Grain-Growth Kinetics of Nanocrystalline Iron Studied In Situ by Synchrotron Real-Time X-ray Diffraction

2000 ◽  
Vol 104 (11) ◽  
pp. 2467-2476 ◽  
Author(s):  
H. Natter ◽  
M. Schmelzer ◽  
M.-S Löffler ◽  
C. E. Krill ◽  
A. Fitch ◽  
...  
Keyword(s):  
Real Time ◽  
Grain Growth ◽  
Growth Kinetics ◽  
X Ray Diffraction ◽  
X Ray ◽  
Nanocrystalline Iron ◽  
Grain Growth Kinetics ◽  
Kinetics Of

scholarly journals Effect of Heat Treatment of Martensitic Stainless Steel on Passive Layer Growth Kinetics Studied by Electrochemical Impedance Spectroscopy in Conjunction with the Point Defect Model

2020 ◽  
Vol 1 (1) ◽  
pp. 77-91 ◽  
Author(s):  
Ingmar Bösing ◽  
Georg Marquardt ◽  
Jorg Thöming
Keyword(s):  
Heat Treatment ◽  
Stainless Steel ◽  
Electrochemical Impedance Spectroscopy ◽  
Impedance Spectroscopy ◽  
Passive Film ◽  
Growth Kinetics ◽  
Martensitic Stainless Steel ◽  
Electrochemical Impedance ◽  
Defect Model ◽  
Point Defect Model

Martensitic stainless steels are widely used materials. Their mechanical and corrosion properties are strongly influenced by their microstructure and thereby can be affected by heat treatment. In the present study, the effect of different austenitizing temperatures on the passive film growth kinetics of martensitic stainless steel is studied by electrochemical impedance spectroscopy. The data was further fitted by the point defect model to determine kinetic parameters. We show that an increasing austenitizing temperature leads to a more protective passive film and slows down passive film dissolution in sulfuric acid.

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