The influence of nickel–aluminium bronze microstructure and crevice solution on the initiation of crevice corrosion

Wharton, J.A.; Stokes, K.R.

doi:10.1016/j.electacta.2007.10.047

Cited by 137 publications

(92 citation statements)

References 43 publications

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“…The alloy's property comes from a very complex network of microstructures. It generally consists of columnar grains of face centred cubic (FCC) copper-rich solid solution known as α-phase and a small volume fraction of β-phase or retained martensitic β'-phase, surrounded by a series of intermetallic Fe-rich kappa phases [14], [16], [44]- [46].…”

Section: Test Materialsmentioning

confidence: 99%

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Different methods of measuring synergy between cavitation erosion and corrosion for nickel aluminium bronze in 3.5% NaCl solution

Basumatary

Wood

2020

Tribology International

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Section: Test Materialsmentioning

confidence: 99%

“…The sample materials were expected to undergo rapid redox reactions as shown from Equations (3) - (6) taking place in the electrochemical cell [16].…”

Section: Fig 14: Eis Fit Plot For Nab Under C and T Conditionsmentioning

confidence: 99%

Different methods of measuring synergy between cavitation erosion and corrosion for nickel aluminium bronze in 3.5% NaCl solution

Basumatary

Wood

2020

Tribology International

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“…The nil toxicity, 31 the high overpotentials for oxygen and hydrogen evolutions [8], 32 the high chemical and physical stability in addition to the low 33 capacitive current in aqueous solutions [9], make BDD an attractive 34 electrode material widely used in electroanalysis. One of the most 35 extensively investigated BDD characteristics is the surface 36 property and its influence on the electron transfer process.…”

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confidence: 99%

Electrochemical detection of cupric ions with boron-doped diamond electrode for marine corrosion monitoring

Nie

Neodo

Wharton

et al. 2016

Electrochimica Acta

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A B S T R A C TCorrosion induced structural failures continue to be a costly problem in many industrial situations, and the development of robust corrosion sensing systems for structural health integrity monitoring is still a demanding challenge. The applicability of corrosion monitoring of copper alloys using a boron-doped diamond electrode (BDD) has been performed based on determination of copper ions within localised corrosion microenvironments. The electrochemical behaviour of copper ions on the BDD electrode surface were first reported in details in 0.60 M NaCl aqueous solution, and the results revealed that the electrochemical processes of copper ions on the BDD electrode proceed as two successive single electron transfer steps producing two well-separated pairs of peaks in cyclic voltammograms in the chloride ion containing electrolyte solutions. Compared with perchlorate and sulphate ions, chloride ions were observed with a significant stabilization effect on copper ions via the formation of Moreover, differential pulse voltammetric results exhibited the BDD electrode is promising for corrosion monitoring of copper alloys with an excellent relationship between peak current and concentration of copper ions without significant interference from the commonly presented metal ions within the simulated marine corrosion environments.

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“…[12] FSP reduces or removes casting porosities and produces a more uniform distribution of phases. FSP also dissolves a, K I , K II , K III , and K IV phases into the b phase, and likewise the severe deformation and heating during FSP also result in recovery and recrystallization in the deformed a matrix as well as spheroidization of retaining lamellar K III [13] . Equiaxed a grain dominates the microstructure of FSP NAB.…”

Section: A Microstructural Properties Of Nabmentioning

confidence: 99%

“…The layer is then realised by the complexion of Al by the chloride and followed by hydrolysis to produce an aluminum hydroxide layer [13] :…”

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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The influence of nickel–aluminium bronze microstructure and crevice solution on the initiation of crevice corrosion

Cited by 137 publications

References 43 publications

Different methods of measuring synergy between cavitation erosion and corrosion for nickel aluminium bronze in 3.5% NaCl solution

Different methods of measuring synergy between cavitation erosion and corrosion for nickel aluminium bronze in 3.5% NaCl solution

Electrochemical detection of cupric ions with boron-doped diamond electrode for marine corrosion monitoring

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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