Electrochemical behaviour of Mo‐containing austenitic stainless steels in buffer solution

Heakal, F. El-Taib; Ameer, M.A.; El-Aziz, A. M.; Fekry, Amany M.

doi:10.1002/mawe.200400772

Cited by 13 publications

(8 citation statements)

References 35 publications

(32 reference statements)

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“…Although the actual value of ε r within the film is difficult to estimate, a change of C can be used as an indicator for change in the film thickness [55]. Hence, the reciprocal capacitance (1/C) of the surface film is directly proportional to its thickness [56][57][58].…”

Section: Potentiodynamic Polarization Studiesmentioning

confidence: 99%

“…where ε o is the vacuum permittivity (8.85×10 −12 Fcm −1 ), ε r is the relative dielectric constant of the film and A is the electrode area in cm 2 . Although the actual value of ε r within the film is difficult to estimate, a change of C can be used as an indicator for change in the film thickness [55]. Hence, the reciprocal capacitance (1/C) of the surface film is directly proportional to its thickness [56][57][58].…”

Section: Potentiodynamic Polarization Studiesmentioning

confidence: 99%

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Electrochemical Behavior of Ti-6Al-7Nb in Simulated Physiological Body Fluid Environment

Al-Mobarak¹,

Al-Swayih²,

Al-Rashoud³

2013

ECS Trans.

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The electrochemical behavior of Ti-6Al-7Nb was investigated, and compared with that of Ti-6Al-4V alloy, which is commonly used as implant material, particularly for dentistry, orthopaedic and osteosynthesis applications. The aim of present study was to evaluate their corrosion resistance in an artificial physiological conditions using Hanks solution at 37 • C. This evaluation was carried out through the analysis of the potentiodynamic polarization (PD), and electrochemical impedance spectroscopy (EIS) tests. Very low current densities were obtained from the PD curves, indicating a typical passive behavior for two investigated alloys. The EIS results at open circuit potential and at different potential exhibited capacitive behavior (high corrosion resistance) with phase angles close to −90• and high impedance values at low and medium frequencies, which are indicative of the formation of a highly stable film on these alloys in the test solution. The resistance of TAN is slightly higher than that of TAV. This difference can be attributed to the alloying elements. For TAN, the formation of Nb 2 O 5 oxide, which is chemically more stable and less soluble compared to V 2 O 5 formed on the Ti-6Al-4V alloy, enhances resistance to dissolution of the surface film. Thus, it has been suggested that Ti-6Al-7Nb can be a better alternative to Ti6Al-4V in simulated body fluid environment.

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Section: Potentiodynamic Polarization Studiesmentioning

confidence: 99%

Section: Potentiodynamic Polarization Studiesmentioning

confidence: 99%

Electrochemical Behavior of Ti-6Al-7Nb in Simulated Physiological Body Fluid Environment

Al-Mobarak¹,

Al-Swayih²,

Al-Rashoud³

2013

ECS Trans.

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“…El-Taib Heakal et al's 2004 study [32] on the electrochemical behaviors of molybdenumcontaining stainless steels in the presence of aerated and reaerated solutions supported the hypothesis that the alloying elements were responsible for the pH drop. In 2007, the same authors [33] investigated the stability of the growth of passivation films in stainless steels, where alloying elements such as molybdenum provide that stability.…”

Section: Introductionmentioning

confidence: 94%

Use of Electrochemical Noise for the Study of Corrosion by Passivated CUSTOM 450 and AM 350 Stainless Steels

Almeraya-Calderon,

Villegas-Tovar,

Maldonado-Bandala

et al. 2024

Metals

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Precipitation-hardening stainless steels, like AM 350 and Custom 450, are extensively utilized in various aerospace applications. The latter steel is utilized for applications needing great strength and corrosion resistance. In contrast, the former steel has a good corrosion resistance and moderate strength. The purpose of this study was to analyze transient frequencies in the electrochemical noise of Custom 450 and AM 350 stainless steels that had been passivated for 60 and 90 min at 25 and 49 °C using baths of citric and nitric acid and then immersed in solutions containing 1% sulfuric acid (H2SO4) and 5% sodium chloride (NaCl). The potentiodynamic polychromatic curves employed electrochemical techniques and noise (EN) based on the ASTM-G5 and G199 standards. Two methods of data analysis were applied concerning EN: the domain of frequencies (power spectral density, PSD) and the time–frequency domain (Hilbert-Huang Transform). The PHSS passivated in citric acid indicated current densities in the H2SO4 solution between 10−2 and 10−3 mA/cm2, while those in the NaCl solution were recorded around 10−4 and 10−5 mA/cm2. The citric acid functions as a passivating agent. The results of the electrochemical noise analysis show that the PHSS passivated in nitric acid displayed a greater corrosion resistance. Moreover, there is a tendency for PHSS to be passivated in nitric acid to corrode locally.

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“…Although the actual value of e r within the film is difficult to estimate, a change of C can be used as an indicator for change in the film thickness [32]. Hence, the reciprocal capacitance (1/C) of the surface film is directly proportional to its thickness [33,34].…”

Section: Eis Measurementsmentioning

confidence: 99%

Corrosion protection of mild steel by polyvinylsilsesquioxanes coatings in 3% NaCl solution

2009

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Polyvinylsilsesquioxanes (PVS) coatings were synthesized by the hydrolytic polycondensation of vinyltrimethoxysilane using hydrochloric acid as a catalyst. Their structure was characterized by Fourier transform IR (FTIR) and the viscosity [in centipoise(cP)] of polyvinylsilsesquioxanes was measured at 298 K. The electrochemical behavior of I-IV coated steel electrodes, of polymer concentration as follows: [I(20%), II(40%) of viscosity 50 cP and III(20%), IV(40%) of viscosity 15 cP], was investigated in 3% NaCl solution using various electrochemical techniques, i.e., opencircuit potential (OCP), potentiodynamic polarization, electrochemical impedance measurements (EIS), and surface examination via scanning electron microscope (SEM) technique. The influence of immersion time on the electroctrochemical behavior of polysilsesquioxane-coated electrodes was also studied. The results of polarization measurements showed that corrosion current density (i corr ) decreases in the order IV [ III [ II [ I. Also, the film resistance is the highest for PVS-coated electrode I as evaluated from EIS measurements. OCP, EIS, and polarization results are in good agreement with each other. The obtained results were confirmed by surface examination using scanning electron microscope.

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Electrochemical behaviour of Mo‐containing austenitic stainless steels in buffer solution

Cited by 13 publications

References 35 publications

Electrochemical Behavior of Ti-6Al-7Nb in Simulated Physiological Body Fluid Environment

Electrochemical Behavior of Ti-6Al-7Nb in Simulated Physiological Body Fluid Environment

Use of Electrochemical Noise for the Study of Corrosion by Passivated CUSTOM 450 and AM 350 Stainless Steels

Corrosion protection of mild steel by polyvinylsilsesquioxanes coatings in 3% NaCl solution

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