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Glossary Corrosion: All Listings RSS

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(1) A cell, the emf of which is due to the potential difference between a metal in an active state and the same metal in a passive state. (2) A corrosion cell in which the anode is a metal in the active state and the cathode is the same metal in the passi ...

A network of checks or cracks appearing on the surface.

See chemical vapor deposition, physical vapor deposition and sputtering.

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

An electrode commonly used in polarization studies to pass current to or from a test electrode, usually made of noncorroding material

A type of inhibitor that appreciably changes the potential of u metal to a more noble (positive) value.

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

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

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

Fracture of a metal during quenching from elevated temperature. Most frequently observed in hardened carbon steel, alloy steel, or tool steel parts of high hardness and low toughness. Cracks often emanate from fillets, holes, corners, or other stress rais ...

The maximum compressive stress a material is capable of developing. With a brittle material that fails in compression by fracturing, the compressive strength has a definite value. In the case of ductile, malleable, or semiviscous materials (which do not f ...

The electrolyte adjacent to the cathode of an electrolytic cell.

(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 ...

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.

The portion of solution in immediate contact with the cathode during electrolysis.

Heating a metal or alloy to such a high temperature that its properties are impaired. When the original properties cannot be restored by further heat treating, by mechanical working, or by a combination of working and heat treating, the overheating is kno ...

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

The current flowing to or from a unit area of an electrode surface, generally expressed as amps per sq ft or milliamperes per sq ft (also milliamps per sq cm, etc).

A pair of dissimilar conductors, commonly metals, in electrical contact. See also galvanic corrosion.

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

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