Flow influenced electrochemical corrosion of nickel aluminium bronze ? Part I. Cathodic polarisation

Kear, Gareth; Barker, B.D.; Stokes, K.R.; Walsh, Frank C.

doi:10.1007/s10800-004-1758-1

Cited by 60 publications

(31 citation statements)

References 21 publications

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“…In Part I of this series of papers, the cathodic characteristics of NAB were discussed [12]. In this work, the electrochemical characteristics of the anodic dissolution of NAB are examined using the rotating disc electrode (RDE) and the rotating cylinder electrode (RCE) and used in the derivation of the corrosion potential (E corr ) or mixed potential.…”

Section: Introductionmentioning

confidence: 99%

Flow influenced electrochemical corrosion of nickel aluminium bronze ? Part II. Anodic polarisation and derivation of the mixed potential

Kear

Barker

Stokes

et al. 2004

Journal of Applied Electrochemistry

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The mixed charge and mass transfer influenced anodic current response of CA 104 nickel aluminium bronze (NAB) is presented as a function of both laminar (rotating disc electrode) and fully turbulent (rotating cylinder electrode) fluid flow. At low values of positive polarisation, the overall behaviour of the freshly polished material in filtered and artificial seawaters is closely related to that of unalloyed copper. The primary anodic reaction in this case is the selective dissolution of the copper component via a cuprous di-chloride complex anion. At large positive polarisation, the solid solution mole fraction for the production of a discrete film of protective alumina (Al 2 O 3 ) is examined as a function of Reynolds number and discussed in terms of a new mechanism for the passivation NAB in seawater. The polarisation data is used to replicate experimental Reynolds number dependent, corrosion potentials and corrosion current densities over a wide range of electrode angular velocities.

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Section: Introductionmentioning

confidence: 99%

Flow influenced electrochemical corrosion of nickel aluminium bronze ? Part II. Anodic polarisation and derivation of the mixed potential

Kear

Barker

Stokes

et al. 2004

Journal of Applied Electrochemistry

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“…In a series of papers by Kear et al [12][13][14][15], oxygen reduction at NAB in aqueous chloride electrolytes was considered. The cathodic polarisation behaviour was examined in fully characterised seawaters (filtered and artificial) using the RDE and the RCE [12].…”

Section: Mass Transport Controlled Current Density Vs Rotation Speedmentioning

confidence: 99%

“…For freshly polished surfaces, the rate of irreversible charge transfer controlled oxygen reduction is controlled by a 2-electron process and hydrogen evolution is only significant at potentials more negative than -1.0 V vs. SCE. In another paper [13], the authors examined the electrochemical characteristics of anodic dissolution of NAB (at both the RDE and the RCE) were used in the derivation of the corrosion potential, E cor . The dependency of the overall corrosion rate on fluid flow conditions was determined using the high reproducible laminar and turbulent fluid flow regimes at the RDE and RCE geometries.…”

Section: Mass Transport Controlled Current Density Vs Rotation Speedmentioning

confidence: 99%

The rotating cylinder electrode for studies of corrosion engineering and protection of metals—An illustrated review

et al. 2017

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“…[18][19][20] Kear et al [19] have reviewed the corrosion of copper in chloride media, indicating that the corrosion process is complicated by the formation of a surface film or oxide layer. In comparison with copper, it can be determined that the electrode process of NAB is also anodic dissolution of copper, and it may form cuprous dichloride anion simplified as Eq.…”

Section: Electrochemical and Crevice Corrosionmentioning

confidence: 99%

Feasibility Study of Low Force Robotic Friction Stir Process and its Effect On Cavitation Erosion and Electrochemical Corrosion for Ni Al Bronze Alloys

Ahmad

Pan

et al. 2014

Metall Mater Trans B

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Robotic friction stir processing (FSP) has not been widely researched to date. This is perhaps due to the limited force capabilities of industrial robots in comparison with dedicated commercial FSP equipment. When operating a FSP machine, the force used to plunge the tools may range from 5000 to 8000 N which is currently beyond the capability of most robots. However, the capacity of robotic manipulators is increasing, so low force friction stir processing is becoming feasible. The ability of the robot arm to apply a controlled force that is normal to a 3-dimensional surface without the need to reorient the workpiece makes it a very useful tool for FSP of complex components. In this analysis, a robot arm with a capacity of 2500 N is used to improve the surface properties of nickel aluminum bronze (NAB) using low force FSP. Multiple passes were applied to the surface of the test sample for a more consistent spread of the stir zone. The sample was then microhardness tested and demonstrated a 62 pct increase in surface hardness. Cavitation erosion testing of the original and processed surfaces was also performed as per ASTM G-32. The erosion rate of the processed NAB sample was 44 pct of the rate experienced by the original cast NAB sample. Finally, the corrosion potentials of FSP NAB were measured at 45 mV less anodic than the unprocessed material, indicating that the processed material is more noble relative to the cast NAB sample. Robotic friction stir processing (FSP) has not been widely researched to date. This is perhaps due to the limited force capabilities of industrial robots in comparison with dedicated commercial FSP equipment. When operating a FSP machine, the force used to plunge the tools may range from 5000 to 8000 N which is currently beyond the capability of most robots. However, the capacity of robotic manipulators is increasing, so low force friction stir processing is becoming feasible. The ability of the robot arm to apply a controlled force that is normal to a 3-dimensional surface without the need to reorient the workpiece makes it a very useful tool for FSP of complex components. In this analysis, a robot arm with a capacity of 2500 N is used to improve the surface properties of nickel aluminum bronze (NAB) using low force FSP. Multiple passes were applied to the surface of the test sample for a more consistent spread of the stir zone.The sample was then microhardness tested and demonstrated a 62 pct increase in surface hardness. Cavitation erosion testing of the original and processed surfaces was also performed as per ASTM G-32. The erosion rate of the processed NAB sample was 44 pct of the rate experienced by the original cast NAB sample. Finally, the corrosion potentials of FSP NAB were measured at 45 mV less anodic than the unprocessed material, indicating that the processed material is more noble relative to the cast NAB sample.

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Flow influenced electrochemical corrosion of nickel aluminium bronze ? Part I. Cathodic polarisation

Cited by 60 publications

References 21 publications

Flow influenced electrochemical corrosion of nickel aluminium bronze ? Part II. Anodic polarisation and derivation of the mixed potential

Flow influenced electrochemical corrosion of nickel aluminium bronze ? Part II. Anodic polarisation and derivation of the mixed potential

The rotating cylinder electrode for studies of corrosion engineering and protection of metals—An illustrated review

Feasibility Study of Low Force Robotic Friction Stir Process and its Effect On Cavitation Erosion and Electrochemical Corrosion for Ni Al Bronze Alloys

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