Corrosion resistance of Cu-Zr(O) N films in a simulated seawater environment

Castro, José D.; Lima, Mário; Carvalho, S.

doi:10.1016/j.surfcoat.2022.129050

Cited by 11 publications

(3 citation statements)

References 56 publications

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“…Another important aspect is the α exponent of CPEs. CrO was the only one which showed α value (~0.52) pointing to the CPE coat behaving like a Warburg element (W), meaning that a slight diffusion process occurred but was not significant enough to replace the CPE for a W in the EEC [ 39 ]. The remaining α values in CPE coat were between 0.66 and 0.84; hence, the remaining films were demonstrated to be far from the ideal capacitive behavior.…”

Section: Resultsmentioning

confidence: 99%

Corrosion Resistance in Artificial Perspiration of Cr-Based Decorative Coatings

et al. 2023

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We aim at developing hexavalent chromium-free coatings for frequently touched decorative parts. Cr(N,O) and multilayered CrN/CrO coatings were deposited by means of reactive magnetron sputtering. All samples presented good adhesion to the substrates enhanced by an epoxy layer designed to enhance PVD coating adhesion. Similar substrates are found in the automotive industry and can be used in appliances where a metallic finish is desired by the consumer. Corrosion behavior was induced, using artificial sweat to simulate long exposure to human touch for 96 h. In potentiodynamic polarization tests, the coatings were revealed to be nobler than the substrate alone. Cr displayed a non-existent passivation region, while gCrN exhibited a quick passivation of the surface and its respective breakdown and several current fluctuations, indicating the occurrence of pitting, which was confirmed by SEM micrography after the corrosion. Regarding EIS results, all films depicted a diminution of impedance modulus (|Z|) after 96 h, which indicates a diminution of corrosion resistance against artificial sweat. Nitride films exhibited the worst anticorrosive features. On the other hand, Cr and CrO exhibited the highest |Z| values. These results are corroborated by low the corrosion rates of both coatings. The equivalent electrical circuit allows us to confirm oxide formation in the outermost layer of the films due to electrolyte/surface interaction, indicating a self-protecting mechanism. Nitride films showed the lowest values and less corrosion resistance, confirming the results obtained in polarization potentiodynamic tests. The coatings developed in this work, namely Cr and CrO, showed a promising corrosion resistance behavior that could endure a lifetime of frequent human touch in various decorative applications either automotive or general appliances.

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Section: Resultsmentioning

confidence: 99%

Corrosion Resistance in Artificial Perspiration of Cr-Based Decorative Coatings

et al. 2023

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“…Over the past decades, exploration of marine resources and development of marine industry have grown significantly. However, every year, corrosion of parts and equipment of ships and marine infrastructure leads to their premature failure, which entails significant losses as well as environmental pollution [1].…”

Section: Introductionmentioning

confidence: 99%

Influence of TiC Addition on Corrosion and Tribocorrosion Resistance of Cr2Ti-NiAl Electrospark Coatings

et al. 2023

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Marine and coastal infrastructures usually suffer from synergetic effect of corrosion and wear known as tribocorrosion, which imposes strict requirements on the structural materials used. To overcome this problem, novel composite wear- and corrosion-resistant xTiC-Fe-CrTiNiAl coatings with different TiC content were successfully developed. The coatings were obtained by the original technology of electrospark deposition in a vacuum using xTiC-Cr2Ti-NiAl (x = 0, 25, 50, 75%) electrodes. The structure and morphology of the coatings were studied in detail by XRD, SEM, and TEM. The effect of TiC content on the tribocorrosion behavior of the coatings was estimated using tribological and electrochemical (under stationary and wear conditions) experiments, as well as impact testing, in artificial seawater. The TiC-free Fe-Cr2Ti-NiAl coating revealed a defective inhomogeneous structure with transverse and longitudinal cracks. Introduction of TiC allowed us to obtain coatings with a dense structure without visible defects and with uniformly distributed carbide grains. The TiC-containing coatings were characterized by a hardness and elastic modulus of up to 10.3 and 158 GPa, respectively. Formation of a composite structure with a heavily alloyed corrosion-resistant matrix based on α-(Fe,Cr) solid solution and uniformly distributed TiC grains led to a significant increase in resistance to stationary corrosion and tribocorrosion in artificial seawater. The best 75TiC-Fe-CrTiNiAl coating demonstrated the lowest corrosion current density values both under stationary (0.03 μA/cm2) and friction conditions (0.8 μA/cm2), and was characterized by both a 2-2.5 times lower wear rate (4 × 10−6 mm3/Nm) compared to AISI 420S steel and 25TiC-Fe-CrTiNiAl and a high fracture toughness.

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“…Traditional methods for preserving active copper surfaces from corrosion included altering their physical qualities using polymer coatings, inhibitory agents (organic or inorganic), design changes, alloying, and maintenance. However, these technologies have disadvantages such as increased coating thickness, changes in physical properties, 2 decreased substrate conductivity, environmental dangers, and poor anti-corrosion performance 3,4 It is critical to prepare thin, protective coatings on a micrometer or manometer scale that have minimal impact on the substrate's physical properties. This method seeks to preserve the substrate's intrinsic qualities while providing effective corrosion protection.…”

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confidence: 99%

Fabrication of Nanostructured Corrosion-Resistant Superhydrophobic Coating on Copper by Electrodeposition: A Comprehensive Critical Review

Mamgain,

Samanta,

Brajpuriya

et al. 2024

ECS J. Solid State Sci. Technol.

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Corrosion is an undesirable electrochemical reaction that leads to material degradation and affects material properties like ductility, malleability, conductivity, etc. The consequences of corrosion are machine failure, bridge failures, buildings collapse, and significant economic losses to GDP. Furthermore, corrosion can pose serious safety risks that result in casualties which makes minimizing the effect of corrosion a great challenge. Traditional solutions like inhibitors, design modification, and paints are available to prevent corrosion but have many limitations, such as cost, durability, stability issues, and general inefficiency. In this context, a nanostructured superhydrophobic coating (SH) is gaining attention due to its corrosion prevention efficiency and other broad industrial applications. The nano air pockets exhibit a high contact angle due to their unique combination of elevated surface roughness, distinctive nanostructure, and reduced surface energy. This reduces the surface area of contact between the corrosive substance and water droplet and the metal surface, leading to improved efficiency in resisting corrosion.In this paper, the recent electrodeposition to develop corrosion-resistant SH coatings on copper substrates and compression with other metals with their physical, chemical, and thermal stabilities are discussed.

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Corrosion resistance of Cu-Zr(O) N films in a simulated seawater environment

Cited by 11 publications

References 56 publications

Corrosion Resistance in Artificial Perspiration of Cr-Based Decorative Coatings

Corrosion Resistance in Artificial Perspiration of Cr-Based Decorative Coatings

Influence of TiC Addition on Corrosion and Tribocorrosion Resistance of Cr2Ti-NiAl Electrospark Coatings

Fabrication of Nanostructured Corrosion-Resistant Superhydrophobic Coating on Copper by Electrodeposition: A Comprehensive Critical Review

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