May 2025
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31 Reads
Corrosion Science
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Publications (175)
September 2018
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76 Reads
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17 Citations
In this investigation, the role of copper in MnS dissolution was studied in a series of lab-made austenitic stainless steels (SS) with varying Cu content. The base composition of these samples was that of SS 303 and the Cu content was varied between 0.02 and 0.80 wt%. In potentiodynamic polarization experiments, it was found that Cu deposition passivated the MnS inclusions in all except the 0.02 wt% specimen. The critical potential for this passivation, from potentiostatic experiments, was found to be associated with the onset of metastable pitting. The “apparent” pitting potential in the specimen with 0.02 wt% Cu content was approximately 200 mV more negative than the other specimens. This apparent potential was attributed to MnS dissolution, due to a lack of Cu deposition/passivation, and not pitting. With respect to pit repassivation, at concentrations equal to and greater than 0.2 wt% Cu, repassivation potentials were on the order or +0.10 V SCE. In comparison, for the 0.02 wt% Cu specimen, the repassivation potential was less than the OCP (−0.125 V vs. Ag/AgCl) indicating Cu reduction inside the pit plays a role in the measured repassivation potential. Cu release was quantified using a rotating ring disk electrode. In these experiments, oxidation peaks for Cu(I) and Cu(II) were detected. In these experiments Cu was released at low potentials and low, passive, current densities but the resulting near surface concentrations of Cu(I) (0.02 mM) were insufficient to passivate MnS.
November 2017
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4,437 Reads
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5 Citations
November 2017
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93 Reads
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1 Citation
202nd Meeting of the Electrochemical Society, Critical Factors in Localized Corrosion
November 2017
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121 Reads
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5 Citations
November 2017
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96 Reads
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1 Citation
August 2015
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54 Reads
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15 Citations
ECS Transactions
Temperature and pH influence on uniform corrosion of 2024-T3 aluminum alloys is reported through a series of free immersion tests. Extensive results performed in various pH (3 to 10), Cl-, and temperatures (20°C to 80°C) from 1 day up to 1 month are reported to mimic real applications. A comparison with weight loss experiment is demonstrated to provide a quantitative significance of pitting versus uniform corrosion. Severity of uniform corrosion is measured at various pH, temperature, and time. Electrochemical approaches including electrochemical impedance spectroscopy (EIS) and cathodic polarization are utilized characterizing oxygen reduction reaction (ORR) and passivation at different temperatures. Passive film and corrosion product analysis is conducted by electron microscopies to assess microstructure, morphology, and corrosion product formation driven by temperature.
December 2014
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27 Reads
December 2014
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72 Reads
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26 Citations
Conversion coatings are used extensively in metal finishing both as the principal mode of protection and a preliminary step for painting. Chromate-based conversion coatings have been a mainstay technology in this area for many years, but for environmental reasons and risk to health they are targeted for elimination. Rare earth-based technology, particularly cerium-based, has been extensively investigated as a replacement and shown considerable promise in a number of technologies, which are reviewed in this chapter.
September 2014
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48 Reads
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7 Citations
ECS Transactions
Crude glycerol (CG), a low-value byproduct from the biodiesel industry, has a significantly different composition compared to pure glycerol. Generally, crude glycerol contains various impurities, such as methanol, water, soap, free fatty acids (FFAs), fatty acid methyl esters (FAMEs), and glycerides. In this study, crude glycerol-based waterborne polyurethane (WPU) coatings were prepared from polyols synthesized using crude glycerol as a sole feedstock via a thermochemical conversion process. The corrosion properties of coatings were characterized by electrochemical impedance spectroscopy (EIS), polarization measurement and salt spray test. The initial experimental results show that crude glycerol-based WPU coatings have a considerably enhanced corrosion resistant performance of metallic substrate.
Citations (84)
... Al alloys with Mg content beyond 3.5 wt.%, when subjected to moderately high temperatures (60-180 °C), are likely to experience Stress Journal of Mines, Metals and Fuels, 71 (9): 1336-1345; 2023. DOI: 10.18311/jmmf/2023/35459 Corrosion Cracking (SCC) and Intergranular Corrosion (IGC) 2,3 . Phase formation, namely Al 3 Mg 2 along the grain boundaries is majorly responsible for the SCC and intergranular corrosion above 65 °C 4 . ...
- Citing Article
- Publisher preview available
July 2002
... If glycerol is present in an electrodeposition bath, it may increase the corrosion resistance of electrodeposited zinc-based steel coatings [9]. Glycerol can also be used to produce corrosion-resistant waterborne polyurethane (WPU) coatings via a thermochemical conversion process [10]. The purification of crude glycerol is costly and energy-demanding. ...
- Citing Article
April 2014
ECS Meeting Abstracts
... The alloys consist of the base metal and main alloying elements such as Cu, Mn, Si, Mg, Zn. Aluminum alloys are widely applied in aerospace, automobile, as cladding material in nuclear reactors, marine, machinery and equipment, construction, refrigeration, and air conditioners etc. due to its light weight, high strength-toweight ratio, recyclability, ductility, electrical and heat conductivity, cryogenic applications, non-ferromagnetic properties and corrosion resistance [3][4][5]. They are largely selected for its significant weight reduction properties which invariably decreases CO2 emissions. ...
- Citing Chapter
August 2011
... Copper is a commonly used minor alloying element in many commercial Fe/Ni-based corrosion-resistant alloys (CRAs) to improve resistance to general corrosion in non-oxidizing acids, such as sulfuric and phosphoric acids, or it may be present as an impurity. While there is a consensus on the detrimental effects of Cu on passivity in Fe-and Nibased CRAs [1][2][3], the effects of Cu on pit growth and repassivation remain elusive [4][5][6][7]. Some studies contend that Cu is beneficial in suppressing pit propagation due to the nobility of Cu, which slows down the anodic dissolution rate at the bottom of the pit through dealloying or replating of Cu ions inside the pit [4,8,9]. ...
- Citing Article
- Publisher preview available
September 2018
... It is apparent that the more random distribution of the coarse precipitates and the partial disappearance of the PFZs within the weld region 2 as compared to the weld region 1 suggests a slightly different thermal transient between these two weld regions. The slightly higher thermal transient which apparently takes place within the weld region 2, and its general low corrosion susceptibility (Fig. 7 b) is in accordance with post-weld heat treatments investigations [22]. A slight difference in the thermal loading was also reported on both side of the weld nugget [23] and this presumably correlates with the asymmetric corrosion behavior across the weld particularly observed within the plunge area (Fig. 7 a). ...
- Citing Presentation
- File available
November 2017
... b: " microstructural " pits. The lower Volta potential measured within the HAZs of 7075-T651 for the grain boundary regions as compared to the grain interiors [18] indicate that galvanic relationships are established between these two regions192021 and may act as a 5 µ µ µ µ 40 µ µ µ µ 0.6 cm 0.6 cm corrosion driving force along the grain boundaries. Volta potential distribution on the surface has been correlated with localized corrosion phenomena in recent studies [22, 23]. ...
- Citing Conference Paper
- Full-text available
November 2017
... However, the aggregates exhibited a similar behaviour as the natural aggregates. These quenching methods ware applied as for the metallurgy field, which aim at freezing some reactive or non-reactive microstructures with respect to the crystallinity and phase change degree [19]. Nonetheless, the relatively low temperature of 650 o C and the water quenching was not sufficient to cause a significant modification of the reactivity. ...
- Citing Conference Paper
- Full-text available
November 2017
... However, due to the presence of lithium, the alloys might be susceptible to corrosion under service conditions. Thus, extensive research on the corrosion behaviour of Al-Cu-Li alloys has been carried out [1][2][3][4][5][6][7]. It is found that the corrosion behaviour of the alloys could be influenced by the distribution of the strengthening precipitates, including T 1 (Al 2 CuLi), T 2 (Al 5 CuLi 3 ) and T B (Al 7 Cu 4 Li) phases [1,5,[8][9][10][11][12]. ...
- Citing Chapter
October 2013
... Depending on the metallurgical state of the alloy, this can Jead to the formation of a precipitate free zone (PfZ) surrounding the grain boundaries and increasing the susceptibility to intergranular cor rosion of these alloys. The electrochemical characteristics of the Cu-rich intermetallic phases, and mainly S-AliCuMg, have been widely studied (7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18). Authors assumed a mechanism based on the strong reactivity of the partiel es that led to a Cu-enrichment ail along the corroded grain boundaries when the alloy was exposed to an aggressive solution. ...
- Citing Article
January 2005
Journal of The Electrochemical Society
... In conclusion, TSCA at high concentrations causes a large replacement of water on the carbon steel/solution interface, thereby resulting in a good inhibition effect on carbon steel. The polarization parameters, including corrosion potential (Ecorr), corrosion current density (icorr), and cathodic and anodic Tafel slopes (βc and βa) are derived from the Tafel The polarization parameters, including corrosion potential (E corr ), corrosion current density (i corr ), and cathodic and anodic Tafel slopes (β c and β a ) are derived from the Tafel polarization region as the steel was not corroded via localized corrosion with the formation of pits [44][45][46]. The results are listed in Table 3. ...
- Citing Article
January 2002
