Glossary Corrosion: All Listings RSS

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Corrosion in which nickel is selectively leached from nickel-containing alloys. Most commonly observed in copper-nickel alloys after extended service in fresh water. See also dealloying, and selective Ieaching.

A chemical substance or combination of substances that prevent or reduce the rate of the anodic or oxidation reaction by a physical, physico-chemical or chemical action.

Intended to prevent fouling of under-water structures, such as the bottoms of ships; refers to the prevention of marine organism's attachment or growth on a submerged metal surface, generally through chemical toxicity caused by the composition of the meta ...

Ratio of actual to theoretical corrosion based on the total current flow calculated by Faraday

An addition agent for electroplating solutions to prevent the formation of pits or large pores in the electrodeposit.

Current efficiency of the anode..

The change in the initial anode potential resulting from current flow effects at or near the anode surface. Potential becomes mode noble (more positive) because of anodic polarization.

The effect produced by polarization of the anode in electrolysis. It is characterized by a sudden increase in voltage and a corresponding decrease in amperage due to the anode becoming virtually separated from the electrolyte by a gas film.

The gradual degradation or alteration of a material by contact with substances present in the atmosphere, such as oxygen. carbon dioxide, water vapor, and sulfur and chlorine compounds.

(1) The portion of solution in immediate contact with the anode, especially if the concentration gradient is steep. (2) The outer layer of the anode itself.

An appreciable reduction in corrosion by making a metal an anode and maintaining this highly polarized condition with very little current flow.

The structure of metals as revealed by macroscopic examination of the etched surface of a polished specimen.

A technique to reduce corrosion of a metal surface under some conditions by passing sufficient to it to cause its electrode potential to enter and remain in the passive region; imposing an external electrical potential to protect a metal from corrosive at ...

Aging above room temperature. See also aging. Compare with natural aging..

An electrode when polarized frequently yields a current potential relationship over a region which can be approximated by:h=

A film on a metal surface resulting from an electrolytic treatment at the anode..

Electrode reaction equivalent to a transfer of positive charge from the electronic to the ionic conductor. An anodic reaction is an oxidation process. An example common in corrosion is: Me -> Me(+n) + n(e-)

The electrolyte adjacent to the anode in an electrolytic cell.

Electrolytic cleaning in which the work is the anode. Also called reverse-current cleaning.

Forming a conversion coating on a metal surface by anodic oxidation; most frequently applied to aluminum.