Corrosion inhibition of aluminum in sodium hydroxide solutions using some inorganic anions

Wanees, S. Abd El; Nooh, S.; Farouk, A.; Haleem, S. M. Abd El

doi:10.1080/01932691.2021.1914647

Cited by 17 publications

(5 citation statements)

References 76 publications

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“…3c was used to estimate an activation energy of (17 ± 4) kJ mol −1 . This value is of the same order of magnitude as reported by different authors for aluminum dissolution near OCP for similar systems, [50][51][52][53][54][55][56][57] though with different alloy compositions. Electrochemical impedance spectroscopy.-The Nyquist plots (Fig.…”

Section: Resultssupporting

confidence: 88%

“…The activation energy for etching of (17 ± 4) kJ mol −1 found during this work is in agreement with the activation energy for aluminum dissolution in alkaline conditions observed previously. [52][53][54][55][56] This value has been reported to be between 10.76 and 68.4 kJ mol −1 . The observed activation energy is too low to be associated with typical covalent bond formation or breaking, and too low to be associated with the oxygen lattice diffusion in aluminum oxide.…”

Section: Discussion: Surface Enrichment Of Alloy Elements and Effect ...mentioning

confidence: 91%

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Recycled Aluminium Alloys and their Models: Role and Behaviour of Alloying Elements during Alkaline Etching

Mysliu¹,

Storli²,

Kjørsvik³

et al. 2023

J. Electrochem. Soc.

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Alkaline etching is a common pretreatment for aluminium surfaces. Etching behaviour was compared between an alloy based on post-consumer scrap (PCS) and several model alloys of rolled AA3005 and extruded AA6060 with systematically varied amounts of Mn, Cu, and Ni. Analysis of concentrations of alloy elements in the etching solution by inductively coupled plasma mass spectrometry (ICP-MS) shows that significant fractions of the investigated elements Cu, Fe, Mg, Mn, Ni, and Zn dissolve. Surface analysis of samples in different stages of the etching process show (i) an increase in oxide layer thickness with etching time, (ii) an enrichment of important alloy elements and impurities (Cr, Cu, Fe, Mg, Mn, Si) near the metal/oxide interface, and (iii) the deposition of Mg, Fe, Si-containing aluminium hydroxide on the surface. A comparison with open circuit potential measurements and time-resolved electrochemical polarisation resistance measurements enables a detailed analysis of the etching mechanism. The aluminium dissolution rate during etching is limited by the transport of species through the oxide precursor layer, making it potential-independent. Differences in etching rates between different alloy classes, evidenced by mass loss measurements, are related to differences in the cathodic or anodic reaction mechanisms (hydrogen evolution or metal dissolution) during etching.

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Section: Resultssupporting

confidence: 88%

Section: Discussion: Surface Enrichment Of Alloy Elements and Effect ...mentioning

confidence: 91%

Recycled Aluminium Alloys and their Models: Role and Behaviour of Alloying Elements during Alkaline Etching

Mysliu¹,

Storli²,

Kjørsvik³

et al. 2023

J. Electrochem. Soc.

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“…The rise in the R ct values with more amounts of the DMAB substance in the hydrochloric acid media (1.0 M) could confirm the rise in the capability of the DMAB substance to be adsorbed on the surface of the investigated steel, lowering the rate of the corrosion reaction . Also, the values of the double-layer capacitance, C dl , decreased as the amount of the DMAB molecules increased, which could confirm the greater thickness of the electrical double layer due to the reduction in the rate of metal corrosion, emphasizing the adsorption of the DMAB substance on the investigated metal. , …”

Section: Resultsmentioning

confidence: 99%

“… 16 Also, the values of the double-layer capacitance, C dl , decreased as the amount of the DMAB molecules increased, which could confirm the greater thickness of the electrical double layer due to the reduction in the rate of metal corrosion, emphasizing the adsorption of the DMAB substance on the investigated metal. 16 , 48 …”

Section: Resultsmentioning

confidence: 99%

Retardation of the C-Steel Destruction in Hydrochloric Acid Media Utilizing an Effective Schiff Base Inhibitor: Experimental and Theoretical Computations

Saleh,

Alfakeer,

Felaly

et al. 2024

ACS Omega

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“…On the other hand, the N-Fe bond increases from 38.58% to 78.74%. The density of Cr 2 O 3 is higher than that of CrO 3 , and it is more stable [36]. The chemical reaction formula of Cr 2 O 3 is as follows ( 4) and ( 5):…”

Section: Analysis Of the Xps Peak Fitting Spectrum Of The N Elementmentioning

confidence: 99%

Influence of Rust Inhibitors on the Microstructure of a Steel Passive Film in Chloride Concrete

Guo

Lin

et al. 2022

Coatings

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To compare the corrosion inhibition behaviors of rust inhibitors with different mechanisms on steel bars, the rust resistance effect of sodium molybdate (Na2MoO4), sodium chromate (Na2CrO4), benzotriazole (BTA), N-N dimethyl ethanolamine, sodium molybdate (Na2MoO4) + benzotriazole (BTA), and sodium chromate (Na2CrO4) + benzotriazole (BTA) on steel bars in a simulated chloride concrete pore solution was studied. The rust resistance effects of different types of rust inhibitors were assessed by electrochemical impedance spectroscopy (EIS), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), and scanning electron microscopy (SEM). The effects of different types of rust inhibitors on the film formation characteristics of a passive film on a steel bar surface were expounded. The results show that: When sodium molybdate (Na2MoO4) and benzotriazole (BTA) acted together, the impedance value and the capacitive reactance arc radius were the largest, and the density of the passive film and the inhibition efficiency were the highest. The composition of the passive film was primarily composed of iron compounds, and it also contained oxide and adsorption films that were formed on the steel bar surface by the rust inhibitors. The rust resistance effect was proportional to the compactness of the passive film.

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Corrosion inhibition of aluminum in sodium hydroxide solutions using some inorganic anions

Cited by 17 publications

References 76 publications

Recycled Aluminium Alloys and their Models: Role and Behaviour of Alloying Elements during Alkaline Etching

Recycled Aluminium Alloys and their Models: Role and Behaviour of Alloying Elements during Alkaline Etching

Retardation of the C-Steel Destruction in Hydrochloric Acid Media Utilizing an Effective Schiff Base Inhibitor: Experimental and Theoretical Computations

Influence of Rust Inhibitors on the Microstructure of a Steel Passive Film in Chloride Concrete

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