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open-circuit
potential
The potential of an electrode measured with
respect to a reference electrode or another electrode when no current flows
to or from it.
organic
Being or composed of hydrocarbons or their
derivatives, or matter of plant or animal origin. Contrast with inorganic.
organic
acid
A chemical compound with one or more carboxyl radicals
(COOH) in its structure; examples are butyric acid, CH3(CH2)2COOH;
maleic acid, HOOCCH-CHCOOH; and benzoic acid, C6H5COOH.
organic
zinc-rich paint
Coating containing zinc powder pigment andan organic
resin.
overaging
Aging under conditions of time and temperature greater than
those required to obtain maximum change in a certain property, so that the
property is altered in the direction of the initial value.,/dd>
oveheating
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 known as burning.
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overvoltage
The difference between the actual electrode potential
when appreciable electrolysis begins and the reversible electrode
potential.
oxidation
(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, such as air.
oxidized
surface (on steel)
Surface having a thin, tightly adhering, oxidized skin
(from straw to blue in color), extending in from the edge of a coil or
sheet.
oxidizing
agent
A compound that causes oxidation, thereby
itself being reduced.
oxygen
concentration cell
A galvanic cell resulting from difference in oxygen
concentration between two locations; See differential aeration cell.
ozone
A powerfully oxidizing allotropic form of the element
oxygen. The ozone molecule contains three atoms (O3). Ozone gas
is decidedly blue, and both liquid and solid ozone are an opaque blue-black
color, similar to that of ink.
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