Corrosion Studies on Electrodeposited Nickel-Manganese Coatings

Ananth, M.V.

doi:10.1080/00202967.1997.11871179

Cited by 21 publications

(16 citation statements)

References 2 publications

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“…It is also proposed that Mn 2+ discharge could take place through the following mechanism (reactions (9) and (10)) in the presence of NH 3 [36][37][38][39][40][41]:…”

Section: Effect Of Phmentioning

confidence: 99%

“…It is expected that at a lower pH, Mn 2+ exists mainly as [Mn(H 2 O) 6 ] 2+ , and at a higher pH, it is [Mn(H 2 O) 6−n (NH 3 ) n ] 2+ [35][36][37][38][39][40]. Therefore, at a low pH, the formation of proper complexes for the co-deposition of Mn and Co leads to an increase in the current efficiency rate.…”

Section: Effect Of Phmentioning

confidence: 99%

“…It should be considered that at a low pH, Mn ions are only in a hydrated form. In addition, it is well known that the ammonium sulphate concentration is affected by the electrolyte pH [39]. Therefore, a pH above 2.5 and the presence of Mn hydroxide [Mn(OH) 2 ] and Co hydroxide [Co(OH) 2 ] and their oxidation products make the solution unclear and decrease the current efficiency, which is harmful for the co-deposition of Mn-Co. Another reason for the increased current efficiency due to the increase in the pH and the decreased current efficiency due to the increase in the pH is the concentration of H + in the electrolyte.…”

Section: Effect Of Phmentioning

confidence: 99%

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Influence of electrodeposition parameters on the characteristics of Mn–Co coatings on Crofer 22 APU ferritic stainless steel

Ebrahimifar

Zandrahimi

2017

Bull Mater Sci

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Manganese-cobalt coatings are promising candidates for solid oxide fuel cell (SOFC) interconnection applications because of their high conductivity and good oxidation resistance. In the present study, manganese and cobalt are electrodeposited on Crofer 22 APU ferritic stainless steel. The effects of current density, pH, sodium gluconate (NaC 6 H 11 O 7) concentration, cobalt sulphate concentration (CoSO 4 •7H 2 O) and deposition duration on the microstructure and cathodic efficiency are characterized by means of scanning electron microscopy, weight gain measurements and energy-dispersive X-ray spectrometry, respectively. Results show that increases in current density and deposition duration lead to decrease in current efficiency and deposition rate. Increasing the pH to 2.5 causes an initial rise of current efficiency and deposition rate, followed by subsequent decline. In addition, the increases in sodium gluconate and cobalt sulphate concentrations in the electrolyte solution result in an increase in current efficiency and deposition rate. Moreover, the results demonstrate that the variations in the current density, pH, sodium gluconate (NaC 6 H 11 O 7) concentration, cobalt sulphate concentration (CoSO 4 •7H 2 O) and duration have a significant effect on grain size, uniformity and the adherence of the coating.

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“…It is also proposed that Mn 2+ discharge could take place through the following mechanism (reactions (9) and (10)) in the presence of NH 3 [36][37][38][39][40][41]:…”

Section: Effect Of Phmentioning

confidence: 99%

Section: Effect Of Phmentioning

confidence: 99%

Section: Effect Of Phmentioning

confidence: 99%

See 1 more Smart Citation

Influence of electrodeposition parameters on the characteristics of Mn–Co coatings on Crofer 22 APU ferritic stainless steel

Ebrahimifar

Zandrahimi

2017

Bull Mater Sci

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“…As-deposited ED-Ni can have a fine-grained structure and thus a higher density of grain boundaries, which can lead to a higher overall corrosion rate [27,28]. Incorporation of species from the electroplating bath, e.g., C [19], Mn [22], P [28], S [19,24], Si [19], Zn [23], can also have a deleterious effect on corrosion performanceincreasing corrosion current density and decreasing pitting resistance. However, other additions such as boron have been shown to improve corrosion behavior compared to a pure Ni electrodeposit [25].…”

Section: Introductionmentioning

confidence: 99%

“…Comparisons of electrodeposited (ED) Ni (e.g., Ni platiing) to wrought Ni have shown the corrosion resistance to be lower than that of wrought Ni, but no fundamentally different corrosion modes have been reported [19,[21][22][23][24][25][26][27]. As-deposited ED-Ni can have a fine-grained structure and thus a higher density of grain boundaries, which can lead to a higher overall corrosion rate [27,28].…”

Section: Introductionmentioning

confidence: 99%

Corrosion behavior of a structural nickel electrodeposit

2005

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The corrosion behavior of electrodeposited structural Ni (LIGA Ni) was assessed under aqueous and atmospheric conditions. Corrosion rates were measured and damage morphology was documented for comparison with wrought materials such as commercially available Ni 201 and high purity (99.999) Ni. As-fabricated LIGA Ni showed excellent corrosion resistance in aqueous NaCl solution even when galvanically coupled to a more noble material such as gold. Mechanically polished LIGA Ni showed corrosion resistance comparable to that of Ni 201, whereas polished 99.999 Ni had the best overall corrosion performance. Exposure to an aggressive atmospheric environment resulted in a higher density of corrosion sites on the LIGA material than on the control materials; however, the composition of the corrosion products (nickel-chloride) and the morphology of the attack was nominally the same on all tested samples. Overall, no new corrosion modes or susceptibilities were identified for LIGA Ni compared to wrought Ni materials. The superior corrosion resistance of the as-fabricated LIGA compared to mechanically polished LIGA, is discussed in terms of surface property modification during a chemical processing step.

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Development of a Novel, Impurity-Scavenging, Corrosion-Resistant Coating for Ni-Based Superalloy CMSX-4

Pek

Appleton

et al. 2022

High Temperature Corrosion of mater.

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Sulfur, a common impurity arising from atmospheric and environmental contamination, is highly corrosive and detrimental to the lifespan of nickel superalloys in jet engines. However, sulfur-scavenging coatings have yet to be explored. Our study presents the successful development of a stable, uniform, impurity-scavenging Ni-Mn coating on Ni-based superalloy CMSX-4, through electroplating. The coating was characterised via combined scanning transmission electron microscopy and energy-dispersive X-ray spectroscopy. An optimal coating thickness of > 600 nm was deposited. The coated alloy was exposed to corrosive salt mixture 98% Na2SO4–2% NaCl at 550 °C for 100 h, mimicking engine exposure conditions, thereby proving that the coating successfully trapped sulfur and prevented its diffusion into an underlying alloy. This work presents a promising development for the prevention of sulfur-induced corrosion in industrial setting such as gas turbine engine, where the effects of sulfur diffusion into the bulk alloy could lead to premature failure. Graphical Abstract

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Corrosion Studies on Electrodeposited Nickel-Manganese Coatings

Cited by 21 publications

References 2 publications

Influence of electrodeposition parameters on the characteristics of Mn–Co coatings on Crofer 22 APU ferritic stainless steel

Influence of electrodeposition parameters on the characteristics of Mn–Co coatings on Crofer 22 APU ferritic stainless steel

Corrosion behavior of a structural nickel electrodeposit

Development of a Novel, Impurity-Scavenging, Corrosion-Resistant Coating for Ni-Based Superalloy CMSX-4

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