A period prior to the detection of corrosion while the metal is in contact with a corrodent.

Electrode reaction equivalent to a transfer of negative charge from the electronic to the ionic conductor. A cathodic reaction is a reduction process. An example common in corrosion is: Ox + ne s Red.

The potential of a corroding surface in an electrolyte, relative to a reference electrode. Also called rest potential, open circuit potential, or freely corroding potential.

The development of slight breaks in a coating that do not penetrate to the underlying surface.

A positively charged ion that migrates through the electrolyte toward the cathode under the influence of a potential gradient. See also anion and ion.

A process in which metal ions in a dilute aqueous solution are plated out on a substrate by means of autocatalytic chemical reduction.

(1) The amount of any substance dissolved or deposited in electrolysis is proportional to the total electric charge passed. (2) The amounts of different substances dissolved or deposited by the passage of the same electric charge are proportional to their ...

Electrolytic pickling in which the work is the cathode.

A network of checks or cracks appearing on the surface.

The stress that will cause fracture in a creep test at a given time in a specified constant environment. Also called stress-rupture strength.

The electrolyte adjacent to the cathode of an electrolytic cell.

A compound with a central atom or ion bound to a group of ions or molecules surrounding it. Also called coordination complex. See also chelate, complexation, and ligand.

(1) A reaction in which there is an increase in valence resulting from a loss of electrons. Contrast with reduction. (2) A corrosion reaction in which the corroded metal forms an oxide; usually applied to reaction with a gas containing elemental oxygen, s ...

A cell developed in an electrolyte resulting from electrical contact between two dissimilar metals. See galvanic corrosion.

The ratio of the electrochemical equivalent current density for a specific reaction to the total applied current density.

Localized corrosion of a metal surface at, or immediately adjacent to, an area that is shielded from full exposure to the environment because of close proximity between the metal and the surface of another material.

A substance that produces depolarization.

The destruction of adhesion between a coating and the surface coated.

An instrument for indicating or measuring a small electric current by means of a mechanical motion derived from electromagnetic or electrodynamic forces produced by the current.

The ratio of the electric current density to the electric field in a material. Also called electrical conductivity or specific conductance.