Search results for: G. Kear

Items from 1 to 13 out of 13 results

article

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

F.C. Walsh, G. Kear, A.H. Nahlé, J.A. Wharton, more

Corrosion Science > 2017 > 123 > C > 1-20

The uniform flow generated at moderate rotation speeds, controlled mass transport rate and uniform current distribution make the RCE attractive for turbulent flow studies of corrosion and protection. Controlled flow and mass transport are characterised by peripheral velocity and mass transport coefficient. Important aspects in corrosion include metal dissolution, oxygen reduction, stability of surface...

article

In situ synchrotron X-ray diffraction study of surface scale formation during CO2 corrosion of carbon steel at temperatures up to 90°C

B. Ingham, M. Ko, G. Kear, P. Kappen, more

Corrosion Science > 2010 > 52 > 9 > 3052-3061

In situ synchrotron X-ray diffraction was used to follow the formation of corrosion product scales on carbon steel in CO ₂ saturated brine at temperatures from 40 to 90°C. The corrosion process was accelerated by applying a small anodic current, and in selected tests a scale inhibitor, amino trimethylene phosphonic acid (ATMPA), was added. Siderite was identified as the major phase in the...

article

Part 2: Cyclic voltammetry and characterisation of the corrosion mechanism

G. Kear, B.D. Barker, K.R. Stokes, F.C. Walsh

Electrochimica Acta > 2007 > 52 > 7 > 2343-2351

The cyclic voltammetry and mixed potential behaviour of freshly polished UNS C70610 (CN 102) 90–10 copper–nickel has been examined in fully characterised seawaters using the rotating disc electrode (RDE) and the rotating cylinder electrode (RCE). Reynolds number dependent corrosion potentials are derived for a wide range of Reynolds numbers and good comparison is made with directly measured values...

article

Part 1: Cathodic and anodic characteristics

G. Kear, B.D. Barker, K.R. Stokes, F.C. Walsh

Electrochimica Acta > 2007 > 52 > 5 > 1889-1898

The polarisation behaviour of freshly polished UNS C70610 (CN 102) 90–10 copper–nickel has been examined in fully characterised seawaters using the rotating disc electrode (RDE) and the rotating cylinder electrode (RCE) geometries. The charge and mass transport controlled responses of both the cathodic and anodic reactions are presented as a function of both laminar and turbulent undisturbed fluid...

article

Strategies for the determination of the convective-diffusion limiting current from steady state linear sweep voltammetry

C. Ponce-de-León, C. T. J. Low, G. Kear, F. C. Walsh

Journal of Applied Electrochemistry > 2007 > 37 > 11 > 1261-1270

The limiting current is an important parameter for the characterization of mass transport in electrochemical systems operating under convective-diffusion control. Four methods to determine the limiting current from current (I) vs. potential (E) plots are considered. Strategies to determine the limiting current values include: (1) direct measurement from I vs. E curves, (2) estimation from the current...

article

The corrosion of nickel–aluminium bronze in seawater

J.A. Wharton, R.C. Barik, G. Kear, R.J.K. Wood, more

Corrosion Science > 2005 > 47 > 12 > 3336-3367

Nickel–aluminium bronze (NAB) alloys show good corrosion resistance under marine conditions. The corrosion behaviour of cast and wrought NAB alloys is illustrated in this work through a range of electrochemical techniques including open-circuit potentiometry with time, oxygen reduction voltammetry, NAB dissolution voltammetry, potential step (or flow step) current transients and linear polarisation...

article

Corrosion and impressed current cathodic protection of copper-based materials using a bimetallic rotating cylinder electrode (BRCE)

G. Kear, B.D. Barker, K.R. Stokes, F.C. Walsh

Corrosion Science > 2005 > 47 > 7 > 1694-1705

A bimetallic rotating cylinder electrode (having individual electrode areas of 10cm ² and rotating at 200–1400rpm) has been used to examine the corrosion and protection characteristics of copper/nickel aluminium bronze and 90–10 copper–nickel/nickel aluminium bronze galvanic couples in filtered seawater at 25°C. The flow-influenced electrochemistry of the systems was determined using zero...

article

Electrochemical corrosion of unalloyed copper in chloride media--a critical review

G. Kear, B.D. Barker, F.C. Walsh

Corrosion Science > 2004 > 46 > 1 > 109-135

The literature dealing with the electrochemical corrosion characteristics of unalloyed copper in aqueous chloride media is examined. The enormous quantity of polarisation and mixed/corrosion potential data that has been made available in the literature over the last 50 years has been compiled and discussed in a comprehensive review. For a wide range of electrode geometries, the importance of the chloride...

article

Electrochemical Corrosion Behaviour of 90—10 Cu—Ni Alloy in Chloride-Based Electrolytes

G. Kear, B.D. Barker, K. Stokes, F.C. Walsh

Journal of Applied Electrochemistry > 2004 > 34 > 7 > 659-669

The corrosion of 90–10 copper—nickel alloy in aqueous chloride electrolytes has received considerable attention in the literature due to its widespread use in seawater and saline environments. From an analysis of the electrochemical behaviour of the alloy, it is clear that both the polarization and mixed/corrosion potential characteristics show a close comparison to unalloyed copper. Important differences...

article

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

G. Kear, B. D. Barker, K. Stokes, F. C. Walsh

Journal of Applied Electrochemistry > 2004 > 34 > 12 > 1235-1240

The cathodic polarisation behaviour of CA 104 nickel aluminium bronze (NAB) has been examined in fully characterised seawaters (filtered and artificial) using the rotating disc electrode (RDE) and the rotating cylinder electrode (RCE). Linear sweep voltammetry and a potential step, current transient technique were used to examine the charge transfer and mass transfer controlled cathodic response as...

article

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

G. Kear, B. D. Barker, K. Stokes, F. C. Walsh

Journal of Applied Electrochemistry > 2004 > 34 > 12 > 1241-1248

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...

article

Instrument Landing at the National Bureau of Standards

Frank G. Kear

IRE Transactions on Aeronautical and Navigational Electronics > 1959 > ANE-6 > 2 > 61 - 67

In 1928 commercial aviation in the United States had developed to the point that the urgent need for additional facilities which would permit all-weather flight was evident to everyone. In anticipation of this need, the aircraft industry had undertaken the development of new and more precise aircraft instruments, including the sensitive altimeter, the artificial horizon, and the directional gyro....

article

Instrument landing at sea

F. Akers, F. G. Kear

IRE Transactions on Military Electronics > 1957 > MIL-1 > 2 > 36 - 43

The paper is a narrative account of two years of intensive effort by the Navy and civilian engineers which, after many trying periods, achieved success on July 30, 1935, when a completely hooded instrument landing was made aboard the aircraft carrier, USS Langley, 100 miles at sea off San Diego, Calif. In the summer of 1933, when the aircraft carrier emerged as the future striking power of our Navy,...

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Keywords

OXYGEN REDUCTION (5)
SEAWATER (5)
FLOW-ENHANCED CORROSION (4)
MASS TRANSPORT (4)
RCE (4)
RDE (4)
MASS TRANSFER (3)
90–10 COPPER–NICKEL (2)
CHLORIDE (2)
CU–10NI (2)
EROSION (2)
ROTATING DISC ELECTRODE (2)
UNS C70610 (2)
90–10 COPPER—NICKEL (1)
A. COPPER (1)
A. COPPER, COPPER–NICKEL, NICKEL ALUMINIUM BRONZE (1)
A. STEEL (1)
B. POLARISATION (1)
B. POLARISATION, RDE/RCE (1)
B. X-RAY DIFFRACTION (1)
BIMETALLIC CORROSION (1)
C. CATHODIC PROTECTION (1)
C. OXYGEN REDUCTION (1)
CHARGE TRANSFER KINETICS (1)
COPPER DEPOSITION (1)
CORROSION (1)
FERRICYANIDE (1)
GALVANIC COUPLING (1)
HYDRODYNAMICS (1)
LIMITING CURRENT (1)
LPR (1)
NAB (1)
NACL (1)
NICKEL ALUMINIUM BRONZE (1)
NICKEL ALUMINIUM BRONZE (NAB) (1)
POLARIZATION CURVES (1)
RDE/RCE (1)
RETICULATED VITREOUS CARBON (1)
ROTATING CYLINDER ELECTRODE (1)
ROTATING CYLINDER ELECTRODE (RCE) (1)
ROTATING DISC ELECTRODE (RDE) (1)
TRIBOLOGY (1)
TURBULENCE (1)
VOLTAMMETRY (1)
WALL-JET ELECTRODE (1)
ZRA (1)
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Elsevier (7)
Springer (4)
ieee (2)

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Search results for: G. Kear

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