The stability of the transpassive film on 304 stainless steel with post-treatment

1994 ◽  
Vol 36 (1) ◽  
pp. 165-169 ◽  
Author(s):  
Guang-Ling Song ◽  
Chu-Nan Cao ◽  
Hai-Chao Lin
Keyword(s):  
Stainless Steel ◽  
Post Treatment ◽  
304 Stainless Steel ◽  
The Stability

Effect of Milling Parameters on the Stability of the Passive Film of AISI 304 Stainless Steel

2021 ◽  
Author(s):  
Rafael dos Santos Pereira ◽  
Roosevelt Droppa ◽  
Mara Cristina Lopes de Oliveira ◽  
Renato Altobelli Antunes
Keyword(s):  
Stainless Steel ◽  
Passive Film ◽  
304 Stainless Steel ◽  
Aisi 304 Stainless Steel ◽  
Aisi 304 ◽  
Milling Parameters ◽  
The Stability

Passive-Active Transition Behavior of 304 Stainless Steel

2007 ◽  
Vol 544-545 ◽  
pp. 423-426 ◽  
Author(s):  
Woon Suk Hwang ◽  
Jeong Ja Lee ◽  
Won Seog Yang ◽  
Seung Chan Na
Keyword(s):  
Stainless Steel ◽  
Passive Film ◽  
Current Density ◽  
Cathodic Current Density ◽  
The Self ◽  
304 Stainless Steel ◽  
Activation Time ◽  
Cathodic Current ◽  
Active Transition ◽  
The Stability

The passive-active transition behavior of a 304 stainless steel was investigated by observing the self-activation behavior and nano-scale galvanostatic cathodic reduction experiment. The self-activation time, τ0 was dependent remarkably on concentration of sulfuric acid. It was appeared that applied nano-scale cathodic current density dissolved the passive film on a 304 stainless steel surface and shortened the activation time in galvanostatic cathodic reduction experiments. The applied cathodic current density was proportional to the reciprocal of activation time. From this linear relationship, the rate of the self-activation process, i0 was obtained. The i0 increased with increasing H2SO4 concentration. And i0 also increased with increasing passivation potential and passivation time. The stability of passive film increased in accordance with increasing τ0 and decreasing i0. Therefore, it was concluded that the stability of passive film on austenitic stainless steel is evaluated by the kinetic parameters of the self-activation rate i0 and the self-activation time, τ0.

scholarly journals Effect of Modified Hexagonal Boron Nitride Nanoparticles on the Emulsion Stability, Viscosity and Electrochemical Behavior of Nanostructured Acrylic Coatings for the Corrosion Protection of AISI 304 Stainless Steel

Coatings ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 488 ◽  
Author(s):  
Alma P. Ysiwata-Rivera ◽  
Ernesto Hernández-Hernández ◽  
Gregorio Cadenas-Pliego ◽  
Carlos A. Ávila-Orta ◽  
Pablo González-Morones ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Surface Modification ◽  
Electrochemical Behavior ◽  
Plasma Polymerization ◽  
Hexagonal Boron Nitride ◽  
304 Stainless Steel ◽  
Aisi 304 Stainless Steel ◽  
Aisi 304 ◽  
Acrylic Coatings ◽  
The Stability

In this study, the effect of pure and modified hexagonal boron nitride (h-BN) nanosheet incorporation on the stability, viscosity, and electrochemical behavior of a waterborne emulsion acrylic coating was studied. The functionalization of h-BN nanoplatelets with polyacrylic acid (PAA) plasma polymerization was performed, and the successful surface modification was determined through water dispersion testing, Fourier transform infrared spectroscopy and thermogravimetric analysis, X-ray photoelectron spectroscopy, and also by transmission electronic microscopy. Later, the stability and viscosity properties of emulsion nanostructured acrylic coatings, which were previously prepared by an ultrasound-assisted mixing system, were analyzed using zeta potential and rheometry testing, respectively. The electrochemical behavior was analyzed by electrochemical impedance spectroscopy. The results prove an effective deposition of PAA films on the h-BN surfaces, which enhanced the stability and viscosity acrylic of nanostructured coatings due to the interactions between the h-BN nanoplatelets surface and emulsion acrylic paint and also with the thickener additives. On the other hand, the electrochemical analysis demonstrated a significant increase (two orders of magnitude) in corrosion resistance in the acrylic nanostructured coatings with 1 wt.% of unmodified and modified h-BN nanoplatelets concerning pure acrylic paint due to a barrier protection mechanism of corrosion inhibition. Therefore, the results demonstrate that the surface modification of h-BN by plasma polymerization (green technology) helped to solve the low dispersibility issue of BN nanosheet surfaces in a waterborne polymer matrix to obtained green nanostructured acrylic coatings with the right balance in in-can properties and corrosion inhibition of AISI 304 stainless steel.

scholarly journals Crystallographic Evaluation of Susceptibility to Intergranular Corrosion in Austenitic Stainless Steel with Various Degrees of Sensitization

Materials ◽  
2020 ◽  
Vol 13 (3) ◽  
pp. 613 ◽  
Author(s):  
Tomoyuki Fujii ◽  
Takaya Furumoto ◽  
Keiichiro Tohgo ◽  
Yoshinobu Shimamura
Keyword(s):  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Intergranular Corrosion ◽  
Coincidence Site Lattice ◽  
Unit Cell ◽  
304 Stainless Steel ◽  
Cell Area ◽  
Sigmoid Curve ◽  
The Stability ◽  
The Relationship

This study investigated the susceptibility to intergranular corrosion (IGC) in austenitic stainless steel with various degrees of sensitization (DOSs) from a microstructural viewpoint based on the coincidence site lattice (CSL) model. IGC testing was conducted using oxalic acid and type 304 stainless steel specimens with electrochemical potentiokinetic reactivation (EPR) ratios that varied from 3 to 30%. As a measure of IGC susceptibility, the width of the corroded groove was used. The relationship between IGC susceptibility, grain boundaries (GB) structure, and EPR ratio of the specimens was evaluated. As a result, the IGC susceptibility cannot be characterized using the Σ value, irrespective of the DOS of the specimen. The IGC susceptibility increases with increasing unit cell area of CSL boundaries, which is a measure of the stability of the CSL boundaries, and then levels off. The relationship between the IGC susceptibility and unit cell area is sigmoidal, irrespective of the DOS of the specimen. The sigmoid curve shifts rightward and the upper bound of IGC susceptibility decreases with decreasing DOS of the specimen.

Kinetic Study of the Passive Film on 304 Stainless Steel Using a Scanning Tunneling Microscope

1995 ◽  
Vol 404 ◽  
Author(s):  
T. J. McKrell ◽  
J. M. Galligan
Keyword(s):  
Stainless Steel ◽  
Oxide Film ◽  
Scanning Tunneling Microscope ◽  
Surface States ◽  
304 Stainless Steel ◽  
Scanning Tunneling ◽  
Tunneling Microscope ◽  
Quantitative Measurements ◽  
The Stability

AbstractThe unique capability of the scanning tunneling microscope, STM, for in situ nanoscale electronic measurements has been utilized to establish the nature of the oxide film on 304 stainless steel under HCI, distilled water, and in air. New insights were obtained concerning the kinetics and electronic surface states of the oxide film as a function of exposure time to these environments: quantitative measurements of the corrosion behavior and the stability of the oxide film, as related to observed defects, have been obtained. These findings have resulted in a model which incorporates these new insights with previously established theories concerning oxidized surfaces.

Comparison of Recovery and Recrystallization in Stainless Steel Following Plane-Wave Shock Loading and Explosive Forming

1970 ◽  
Vol 28 ◽  
pp. 428-429 ◽  
Author(s):  
J. A. Korbonski ◽  
L. E. Murr
Keyword(s):  
Stainless Steel ◽  
Shock Loading ◽  
Pressure Pulse ◽  
Shock Pressure ◽  
304 Stainless Steel ◽  
Strain Rates ◽  
Two Dimensional ◽  
Aisi 304 Stainless Steel ◽  
Aisi 304 ◽  
Explosive Forming

Comparison of recovery rates in materials deformed by a unidimensional and two dimensional strains at strain rates in excess of 104 sec.−1 was performed on AISI 304 Stainless Steel. A number of unidirectionally strained foil samples were deformed by shock waves at graduated pressure levels as described by Murr and Grace. The two dimensionally strained foil samples were obtained from radially expanded cylinders by a constant shock pressure pulse and graduated strain as described by Foitz, et al.

Pyrolytic carbon filaments and associated catalytic particles formed in steel tubes

1984 ◽  
Vol 42 ◽  
pp. 662-663
Author(s):  
Y. L. Chen ◽  
J. R. Bradley
Keyword(s):  
Stainless Steel ◽  
Carbon Steel ◽  
Catalyst Particle ◽  
Pyrolytic Carbon ◽  
Plain Carbon Steel ◽  
304 Stainless Steel ◽  
Hydrocarbon Gases ◽  
Steel Tubes ◽  
Filamentous Carbon ◽  
Carbon Filaments

Considerable effort has been directed toward an improved understanding of the production of the strong and stiff ∼ 1-20 μm diameter pyrolytic carbon fibers of the type reported by Koyama and, more recently, by Tibbetts. These macroscopic fibers are produced when pyrolytic carbon filaments (∼ 0.1 μm or less in diameter) are thickened by deposition of carbon during thermal decomposition of hydrocarbon gases. Each such precursor filament normally lengthens in association with an attached catalyst particle. The subject of filamentous carbon formation and much of the work on characterization of the catalyst particles have been reviewed thoroughly by Baker and Harris. However, identification of the catalyst particles remains a problem of continuing interest. The purpose of this work was to characterize the microstructure of the pyrolytic carbon filaments and the catalyst particles formed inside stainless steel and plain carbon steel tubes. For the present study, natural gas (∼; 97 % methane) was passed through type 304 stainless steel and SAE 1020 plain carbon steel tubes at 1240°K.

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