scholarly journals The semiconductor properties of passive films and corrosion behavior of stainless steel reinforcing bars in simulated concrete pore solution

Materialia ◽  
2019 ◽  
Vol 6 ◽  
pp. 100321 ◽  
Author(s):  
I.G. Ogunsanya ◽  
C.M. Hansson
Keyword(s):  
Stainless Steel ◽  
Corrosion Behavior ◽  
Pore Solution ◽  
Passive Films ◽  
Reinforcing Bars ◽  
Semiconductor Properties

Effect of hydrogen on semiconductor properties and pitting initiation of 2205 duplex stainless steel passivation film

2020 ◽  
Vol 67 (3) ◽  
pp. 313-320 ◽  
Author(s):  
Chuanbo Zheng ◽  
Jiayan Huang ◽  
Gua Yi
Keyword(s):  
Stainless Steel ◽  
Duplex Stainless Steel ◽  
Passive Film ◽  
Corrosion Behavior ◽  
Current Density ◽  
Anodic Polarization ◽  
Content Type ◽  
2205 Duplex Stainless Steel ◽  
Passivation Film ◽  
Semiconductor Properties

Purpose This paper aims to study the effect of current density of hydrogen charging on the semiconductor properties and pitting initiation of 2205 duplex stainless steel (DSS) passivation film. Design/methodology/approach In this work, the 2205 DSS is pre-hydrogenated and passivated. Then, the passivation film is tested by electrochemical impedance method, Mott–Schottky curve method and dynamic potential scanning method. The influences of hydrogen on the properties of the passivation film and the corrosion behavior of the matrix were studied by analyzing the curves obtained in the electrochemical test. The surface of the passivation film after pre-hydrogenation and anodic polarization was observed by using the ultra-depth three-dimensional microscopy and the scanning electron microscope. The integrity, density and corrosion morphology of the passivation film were studied and discussed. Findings With the increase of the hydrogen current density, the growth of the passivation film is hindered, the concentrations of donor and acceptor in the film are increased, the conductivity of the passivation film increases. In the anodic polarization, the dimensional passive current density increases with the increase of the hydrogen current density, and the pitting potential is reversed, the more likely the sample is pitting. In general, hydrogen hinders the formation of the passive film on duplex stainless steel, which increases the concentration of point defects in the passive film. Finally, the passive film is easy to crack and pitting. Originality/value The performance of passive film is an important condition to influence the corrosion behavior of stainless steel. However, little research has been done on the effects of hydrogen on the electrochemistry and pitting sensitivity of 2205 DSS passivation films. The effect of hydrogen on semiconductor properties and pitting initiation of 2205 DSS passivation film is needed to be investigated.

Effects of Hydrogen on Semiconductivity of Passive Films and Corrosion Behavior of 310 Stainless Steel

1999 ◽  
Vol 146 (6) ◽  
pp. 2107-2112 ◽  
Author(s):  
M. Z. Yang ◽  
J. L. Luo ◽  
Q. Yang ◽  
L. J. Qiao ◽  
Z. Q. Qin ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Corrosion Behavior ◽  
Passive Films ◽  
310 Stainless Steel

scholarly journals Diffusivity of Point Defects in the Passive Film on Stainless Steel

2011 ◽  
Vol 2011 ◽  
pp. 1-6 ◽  
Author(s):  
A. Fattah-alhosseini ◽  
M. H. Alemi ◽  
S. Banaei
Keyword(s):  
Stainless Steel ◽  
Film Formation ◽  
Passive Films ◽  
Defect Model ◽  
Exponential Relationship ◽  
Donor Density ◽  
Oxygen Ion ◽  
Aisi 316 Stainless Steel ◽  
Aisi 316 ◽  
Semiconductor Properties

The semiconductor properties of passive films formed on AISI 316 stainless steel in sulfuric acid solution were studied by employing Mott-Schottky analysis in conjunction with the point defect model. The donor density of the passive films, which can be estimated by the Mott-Schottky plots, changes depending on the film formation potentials. Based on the Mott-Schottky analysis, an exponential relationship between donor density and the film formation potentials of the passive films was developed. The results showed that the donor densities evaluated from Mott-Schottky plots are in the range 2-3 × 1021 cm−3and decreased with the film formation potential. By assuming that the donors are oxygen ion vacancies and/or cation interstitials, the diffusion coefficient of the donors, (), is calculated to be approximately 3.12 × 10−16 cm2/s.

Electrochemical corrosion behavior of type 444 stainless steel in synthetic tap water at different temperatures

2020 ◽  
Vol 67 (4) ◽  
pp. 407-414 ◽  
Author(s):  
Minjie Zhang ◽  
Ronghai Xu ◽  
Lele Liu ◽  
Sensen Xin ◽  
Moucheng Li
Keyword(s):  
Stainless Steel ◽  
Corrosion Behavior ◽  
Pitting Corrosion ◽  
Tap Water ◽  
Electrochemical Corrosion ◽  
Passive Films ◽  
Water Heater ◽  
Content Type ◽  
Different Temperatures ◽  
Electrochemical Corrosion Behavior

Purpose The purpose of this paper is to investigate the electrochemical corrosion behavior of type 444 stainless steel (SS) in synthetic tap water from 25°C to 80°C, i.e. the operation environment of the electric water heater. Design/methodology/approach The corrosion behavior was studied by using electrochemical measurements such as electrochemical impedance spectroscopy and polarization curve. The specimen surfaces were observed with scanning electron microscopy. The passive films were characterized with X-ray photoelectron spectroscopy. Findings In the typical tap water, 444 SS passivates spontaneously under different temperatures. The passive films formed at higher temperatures contain relatively less Cr-species and more Cl− ions, resulting in lower polarization resistances. The stable pitting corrosion takes place in the potential region of oxygen evolution as the temperature increases to about 55°C. The critical Cl− concentration of pitting corrosion reduces from about 160 mg L−1 to 60 mg L−1 with changing temperature from 25°C to 80°C. Practical implications The pitting corrosion probability was assessed through the statistical analysis of tap water quality. The results are useful for the application of 444 SS as well as the design of electric water heater. Originality/value This paper shows the variation of polarization resistance, pitting potential, passive film composition and critical pitting chloride concentration with the temperature of tap water. It is of great significance for the development and application of SS in tap water environments.

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