The potential of freshly generated metal surfaces determined from the guillotined electrode—A new technique

Burstein, G.T.; Cinderey, R.J.

doi:10.1016/0010-938x(91)90132-9

Cited by 98 publications

(37 citation statements)

References 27 publications

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“…In fact, it is very difficult to produce an oxide free Al surface. Even if producing such a surface, it is very fastly repassivated by O2 [34]. The capacitive loop at HF corresponds to the interfacial reactions, particularly, the reaction of aluminum oxidation at the metal/oxide/electrolyte interface [33].…”

Section: Resultsmentioning

confidence: 99%

Corrosion Inhibition of Aluminium in Acidic Media by Different Extracts of Trigonellafoenum-graecum L Seeds

Ennouri¹,

Lamiri²,

Essahli³

2017

Port. Electrochim. Acta

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The corrosion inhibition of aluminum by the extract of Trigonellafoenum-graecum L was studied in a hydrochloric acid 1 M solution using electrochemical polarization measurements and electrochemical impedance spectroscopy (EIS). Three organic solvents, pentane, dichloromethane (DCM) and ethanol, of different polarities, were tested. An inhibition efficiency of 86.6 %, 84.41 %, and 75.77 % was obtained by the addition of 1400 ppm of the extract using three solvents: DCM, ethanol and pentane, respectively. The potentiodynamic curves show that the decrease of aluminum corrosion in the presence of the fenugreek extract in a HCl 1 M solution mainly acts by a mixed process with an anodic tendency for both extracts with ethanol and with pentane; on the other hand, the extract with DCM showed a cathodic tendency. The temperature effect on the corrosion of aluminum indicates that the inhibition efficiency of the natural substance decreases with an increase in temperature. The inhibition efficiency values obtained from the polarization curves are in good agreement with those of EIS.

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Section: Resultsmentioning

confidence: 99%

Corrosion Inhibition of Aluminium in Acidic Media by Different Extracts of Trigonellafoenum-graecum L Seeds

Ennouri¹,

Lamiri²,

Essahli³

2017

Port. Electrochim. Acta

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“…Burstein et al [19][20][21][22][23][24] found that the free corrosion potential of freshly generated aluminum surface increased linearly with the logarithm of time during repassivation as the result of oxide film growth. The linear relationship of corrosion potential (E) and log time (t) is suggested to follow Eq.…”

Section: Resultsmentioning

confidence: 99%

“…[19][20][21][22][23][24] This relationship between OCP and immersion time has been utilized to study the growth kinetics of oxide film formed on the bare metal surface [25][26][27][28][29][30][31] as well as at the coating/metal interface.…”

Section: 6mentioning

confidence: 99%

Growth Behavior of Initial Product Layer Formed on Mg Alloy Surface Induced by Polyaniline

Luo

Wang

Guo

et al. 2015

J. Electrochem. Soc.

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The quality of the interfacial protective layer induced by polyaniline (PANI) has been claimed to play a crucial role for the enhanced corrosion protection of Mg alloy, but its growth behavior is not well understood. Here some composition, structure and growth kinetics of the protective layer formed at the PANI-emeraldine base (EB) coating/AZ91D Mg alloy interface were investigated to explore the growth mechanism. Upon immersion in 0.5 M NaCl solution, the growing interface layer under EB coating exhibited a fast passivation rate and an increased corrosion resistance, which was largely influenced by ion concentration. XPS depth profiles showed that the EB-induced layer was a mixture of MgO and Mg(OH) 2 , in which no significant bi-layer structure existed and MgO was dominant throughout the bulk film. These observations suggest that the interaction between EB and Mg can promote the faster growth of a stable MgO-rich layer mixed with Mg(OH) 2 probably by solid reaction. Meanwhile less hydration of MgO and dissolution-precipitation reaction occur, thus leading to less Mg(OH) 2 in the outer layer. Magnesium alloys have drawn great attention in automotive and aerospace industry due to their excellent properties such as low density and high specific strength. However, limited corrosion resistance of such alloys has retarded their widespread applications. To improve the corrosion resistance of Mg alloys, numerous coating techniques have been explored, among which organic coating containing corrosion inhibiting pigments is an economical and effective method in industry. One important pigment for Mg alloys is polyaniline (PANI) including emeraldine salt form (ES) and emeraldine base form (EB). 1-6Its highly efficient corrosion-protection performance for Mg alloys has been shown to be competitive to a chromate-pigmented coating. Additionally, self-healing capability was also found on a hybrid solgel/PANI coated Mg alloy upon immersing in Harrison's solution, where no pitting or filiform corrosion occurred around the scratched area while a protective layer was formed.8 Sathiyanarayanan et al. 1 and Wang et al. 8 observed that, after an initial decrease upon immersion in corrosive electrolytes, the complex impedance of PANI coated Mg alloy recovered, which was attributed to the formation of a protective layer. The different chemical composition on the EB-induced protective layer surface was already confirmed by X-ray photoelectron spectroscopy (XPS) in comparison with that formed underneath a varnish coating. 2,6The mechanism of PANI promoting a protective layer formation has been mostly supported by extensive studies in various metal systems.9-14 Nevertheless, few works have been done to understand the protective layer growth behavior. The most intractable issue of how the interaction between PANI and metal induces the protective layer growth still remains unsolved.9 This is attributed primarily to the great difficulty in in-situ investigation on the growth kinetics of interfacial layer formed beneath a coating. Electroche...

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“…An analysis of this behavior has been carried out by monitoring potential-or current-transients after mechanically stripping the oxide films. Ford et al 19) and Burstein et al [20][21][22][23][24][25][26][27][28] have reported a re-passivation mechanism after removal of passive oxide film by the mechanically stripping technique. There are however problems with the mechanical film stripping techniques, such as low stripping rates, difficult to controling stripping area size of the oxide film and contamination from the stripping tools.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Initial Stage of Localized Corrosion on Zn and Zn Alloy Coated Steels by Photon Rupture Method

Sakairi

Itabashi²,

Takahashi

2005

ISIJ Int.

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A photon rupture method, film removal by a focused pulse of pulsed Nd-YAG laser beam irradiation, has been developed as it enables oxide film stripping at extremely high rates without contamination from the film removal tools. In the present study, Zn and Zn-5mass%Al alloy coated steel specimens covered with protective nitrocellulose film were irradiated with a focused pulse of a pulsed Nd-YAG laser beam at a constant potential in 0.5 kmol m Ϫ3 H 3 BO 3 -0.05 kmol m Ϫ3 Na 2 B 4 O 7 (pHϭ7.4) with/without 0.05 kmol m Ϫ3 of chloride ions to investigate the initial stage of localized corrosion. At low potentials, both samples reformed oxide film after the nitrocellulose films were removed by this method. The oxide film formation kinetics of Zn-55mass%Al follow an inverse logarithmic law, in agreement with Cabrera-Mott theory. However, at high potentials, localized corrosion producing corrosion products occured at the area where nitrocellulose film was removed. The dissolution current of the Zn coated steel samples is higher than that of Zn-5mass%Al coated samples at the same applied potential.

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The potential of freshly generated metal surfaces determined from the guillotined electrode—A new technique

Cited by 98 publications

References 27 publications

Corrosion Inhibition of Aluminium in Acidic Media by Different Extracts of Trigonellafoenum-graecum L Seeds

Corrosion Inhibition of Aluminium in Acidic Media by Different Extracts of Trigonellafoenum-graecum L Seeds

Growth Behavior of Initial Product Layer Formed on Mg Alloy Surface Induced by Polyaniline

Analysis of the Initial Stage of Localized Corrosion on Zn and Zn Alloy Coated Steels by Photon Rupture Method

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