Cathodic protection
A sacrificial anode wastes away while its protective current runs along the bond to the buried pile, whose section never changes.
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Electrochem
15 animationsCorrosion cell
An anodic pit deepens into a steel section and releases metal ions into the electrolyte while the broad cathodic area beside it takes the current.
CSSCoulometry
A cursor sweeps a constant-current run in the upper panel while the accumulated charge climbs its ramp below to meet the dashed equivalence rule.
CSSCyclic voltammetry
The sweep chases round a closed voltammogram, out past the anodic peak and back through the cathodic one, over the pale trace of the whole scan.
CSSDouble layer
Counter-ions drift out of the diffuse region and order onto the Helmholtz plane against a charged electrode face, the layer thickness dimensioned below.
CSSElectrochemical series
A cursor steps up a ruled scale of couples one rung at a time, past the dashed standard hydrogen reference, and holds at the top before returning.
CSSElectrolysis
An applied supply drives the ions of one cell apart, filled cations to the negative electrode and hollow anions to the positive one.
CSSElectroplating
Metal ions land on the cathode and the plated face advances across the hatched allowance towards the dimensioned target thickness.
CSSFuel cell
Protons cross the membrane between the two plates while the electrons they left behind are routed the long way round the external circuit.
CSSGalvanic cell
Electrons stream along the external wire from the anode to the cathode of a two-vessel cell joined below by its bridge.
CSSHalf cell
Ions drift across the electrolyte and land on the electrode face while the measured potential settles onto its tick on the scale alongside.
CSSNernst shift
The working point walks down the Nernst line as the concentration ratio changes, the tick on the potential axis tracking it the whole way.
CSSOverpotential
The working point walks out along a polarisation curve from the equilibrium potential while the dimension bar beneath opens to measure the overpotential.
CSSPassivation
The oxide film breaks back from the metal surface and the corrosion current climbs its scale, then the film closes again and the current falls.
CSSSalt bridge
Filled cations run one way and hollow anions the other through the bridge joining two half cells, keeping both compartments neutral.
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