Galvanic Corrosion

Hack, HP

doi:10.1016/b978-044452787-5.00033-0

Cited by 11 publications

(7 citation statements)

References 7 publications

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“…In pulsed electroreduction, the presence of Zn δ+ O species under the cathodic half cycle can effectively offer the ELASI for stabilizing Cu δ+ O species. In the OCV half cycle, Zn 0 species generated in the cathodic half cycle can act as an anode in galvanic corrosion, thereby protecting Cu δ+ O from further oxidation in Cu 0.50 Zn 0.50 O x electrocatalyst. As clarified in Figures d, S36 and S43, Zn δ+ O retaining a high oxidation state under cathodic situation , can serve as a Lewis acidic support for withdrawing electrons from Cu δ+ O to preserve the high valent species during cathodic half cycles.…”

Section: Resultsmentioning

confidence: 99%

“…In pulsed electroreduction, the presence of Zn δ+ O species under the cathodic half cycle can effectively offer the ELASI for stabilizing Cu δ+ O species. In the OCV half cycle, Zn 0 species generated in the cathodic half cycle can act as an anode in galvanic corrosion, 52 In a typical tandem catalytic mechanism, adsorbed CO 2 is first converted into CO on one site (i.e., Zn), followed by reduction of CO on the Cu site. The primary effect of tandem catalysis is an increase in CO coverage on the Cu surface, which can significantly enhance the C 2+ product formation since the reaction rate of C−C coupling is greatly dependent on CO coverage.…”

Section: ■ Introductionmentioning

confidence: 99%

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Lewis Acidic Support Boosts C–C Coupling in the Pulsed Electrochemical CO₂ Reaction

et al. 2023

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Copper-oxide electrocatalysts have been demonstrated to effectively perform the electrochemical CO 2 reduction reaction (CO 2 RR) toward C 2+ products, yet preserving the reactive high-valent CuO x has remained elusive. Herein, we demonstrate a model system of Lewis acidic supported Cu electrocatalyst with a pulsed electroreduction method to achieve enhanced performance for C 2+ products, in which an optimized electrocatalyst could reach ∼76% Faradaic efficiency for C 2+ products (FE Cd 2+ ) at ∼−0.99 V versus reversible hydrogen electrode, and the corresponding mass activity can be enhanced by ∼2 times as compared to that of conventional CuO x . In situ time-resolved X-ray absorption spectroscopy investigating the dynamic chemical/physical nature of Cu during CO 2 RR discloses that an activation process induced by the KOH electrolyte during pulsed electroreduction greatly enriched the Cu δ+ O/Zn δ+ O interfaces, which further reveals that the presence of Zn δ+ O species under the cathodic potential could effectively serve as a Lewis acidic support for preserving the Cu δ+ O species to facilitate the formation of C 2+ products, and the catalyst structure−property relationship of Cu δ+ O/Zn δ+ O interfaces can be evidently realized. More importantly, we find a universality of stabilizing Cu δ+ O species for various metal oxide supports and to provide a general concept of appropriate electrocatalyst−Lewis acidic support interaction for promoting C 2+ products.

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Section: Resultsmentioning

confidence: 99%

“…In pulsed electroreduction, the presence of Zn δ+ O species under the cathodic half cycle can effectively offer the ELASI for stabilizing Cu δ+ O species. In the OCV half cycle, Zn 0 species generated in the cathodic half cycle can act as an anode in galvanic corrosion, 52 In a typical tandem catalytic mechanism, adsorbed CO 2 is first converted into CO on one site (i.e., Zn), followed by reduction of CO on the Cu site. The primary effect of tandem catalysis is an increase in CO coverage on the Cu surface, which can significantly enhance the C 2+ product formation since the reaction rate of C−C coupling is greatly dependent on CO coverage.…”

Section: ■ Introductionmentioning

confidence: 99%

Lewis Acidic Support Boosts C–C Coupling in the Pulsed Electrochemical CO₂ Reaction

et al. 2023

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“…Galvanic corrosion can be affected by many more factors than salinity (e.g. temperature fluctuations, pollution levels and humidity (Varela et al, 1997;Hack, 1988)). Therefore galvanic response should be considered as a separate attribute.…”

Section: Discussionmentioning

confidence: 99%

Incorporating local environmental factors into railway bridge asset management

Yianni

Neves

Rama

et al. 2016

Engineering Structures

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A novel approach to comparing bridge deterioration rates under different environmental conditions is employed using a network analysis approach. This approach uses a matrix condition scoring system utilised by Network Rail (NR). It does not require any conversion factors which can introduce subjectivity. A number of different factors were analysed to ascertain if they have an effect on bridge deterioration. The key factors were identified and their deterioration profiles incorporated into a probabilistic Petri-Net (PN) model, calibrated with historical data. From these, comparative model outputs pinpointing which factors affect bridge deterioration the most can be computed. Finally, simulations were carried out on the PN model to evaluate which of the factors would have the most financial effect for a transport agency. This allows a bridge manager to categorize bridges in different deterioration sets allowing the definition of different optimal inspection and maintenance strategies for each set.

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“…18 The variation with time in the galvanic corrosion current generated by the Sn-Mn/steel couple and the corresponding coupled potential are shown in Fig. The galvanic coupling was to simulate the situation that may arise following coating damage, which would lead to the exposure of a small area of underlying steel to the aggressive environment.…”

Section: C54mentioning

confidence: 99%

Tin–Manganese Alloy Electrodeposits

Chen

Wilcox

2008

J. Electrochem. Soc.

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The corrosion performance of tin-manganese alloy electrodeposits either immersed in a quiescent sodium chloride solution or exposed to neutral salt spray ͑NSS͒ was studied. The results obtained were then compared with those for conventional pure zinc and zinc-nickel alloy electrodeposits with or without chromate passivation treatment. It was found that tin-manganese alloy electrodeposits provided much longer sacrificial protection against the corrosion of mild steel substrates than zinc-nickel alloy coatings, although they were inferior to pure zinc coatings. The prolonged sacrificial property was attributed to the high polarization resistance of tin-manganese alloy electrodeposits as revealed by linear polarization resistance techniques, which would only allow the corrosion and the consequent ennoblement of these coatings to proceed at a slow rate. The result of NSS tests indicated that tin-manganese alloy electrodeposits, with a time to red rust of about 1200 h, were as good as chromated zinc-nickel alloy coatings but far outperformed pure zinc coatings and nonchromated zinc-nickel coatings. The high corrosion resistance of tin-manganese alloy electrodeposits without any passivation treatment suggests that they may be an environmentally friendly replacement to zinc alloy coatings, which need toxic chromate conversion coatings for corrosion-resistance enhancement.

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Galvanic Corrosion

Cited by 11 publications

References 7 publications

Lewis Acidic Support Boosts C–C Coupling in the Pulsed Electrochemical CO₂ Reaction

Lewis Acidic Support Boosts C–C Coupling in the Pulsed Electrochemical CO₂ Reaction

Incorporating local environmental factors into railway bridge asset management

Tin–Manganese Alloy Electrodeposits

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Galvanic Corrosion

Cited by 11 publications

References 7 publications

Lewis Acidic Support Boosts C–C Coupling in the Pulsed Electrochemical CO2 Reaction

Lewis Acidic Support Boosts C–C Coupling in the Pulsed Electrochemical CO2 Reaction

Incorporating local environmental factors into railway bridge asset management

Tin–Manganese Alloy Electrodeposits

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Lewis Acidic Support Boosts C–C Coupling in the Pulsed Electrochemical CO₂ Reaction

Lewis Acidic Support Boosts C–C Coupling in the Pulsed Electrochemical CO₂ Reaction