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GLOSSARY "R"
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THE
SOLUTION TO CORROSION UNDER INSULATION |
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RG-2400
STOPS CORROSION |
GLOSSARY
OF CORROSION RELATED TERMS |
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RG-2400
will STOP existing corrosion and will prevent corrosion on new piping
systems. Minimal surface preparation is required. |
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RG-2400
has many uses:
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R |
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| RADIATION
DAMAGE |
A general term for the alteration of properties of a material arising from exposure to ionizing radiation (penetrating radiation), such as x-rays, gamma rays. neutrons, heavy-particle radiation, or fission fragments in nuclear fuel material. | |
| RARE EARTH METAL |
One of the group of 15 chemically similar metals with atomic numbers 57 through 71, commonly referred to as the lanthanides. | |
| REACTIVE METAL |
A metal that readily combines with oxygen at elevated temperatures to form very stable oxides, for example, titanium, zirconium, and beryllium. Reactive metals may also become embrittled by the interstitial absorption of oxygen, hydrogen, and nitrogen. | |
| RECRYSTALLIZATION |
(1) Formation of a new, strain free grain structure from that existing in cold worked metal, usually accomplished by heating. (2) The change from one crystal structure to another, as occurs on heating or cooling through a critical temperature. | |
| REDOX POTENTIAL |
The potential of a reversible oxidation-reduction electrode measured with respect to a reference electrode, corrected to the hydrogen electrode, in a given electrolyte. | |
| REDUCING AGENT |
A compound that causes reduction, thereby itself becoming oxidized. | |
| REDUCTION |
A reaction in which there is a decrease in valence resulting from a gain in electrons. Contrast with oxidation. | |
| REFERENCE ELECTRODE |
A nonpolarizable electrode with a known and highly reproducible potential used for potentiometric and voltammetric analyses. See also calomel electrode. | |
| REFRACTORY METAL |
A metal having an extremely high melting point, for example, tungsten, molybdenum, tantalum, niobium, chromium, vanadium, and rhenium. In the broad sense, this term refers to metals having melting points above the range for iron, cobalt, and nickel. | |
| RELATIVE HUMIDITY |
The ratio, expressed as a percentage, of the amount of water vapor present in a given volume of air at a given temperature to the amount required to saturate the air at that temperature. | |
| RESIDUAL STRESS |
Stresses that remain within a body as a result of plastic deformation. | |
| RESISTANCE |
The opposition that a device or material offers to the flow of direct current, equal to the voltage drop across the element divided by the current through the element. Also called electrical resistance. | |
| RESISTIVITY |
See electrical resistivity. | |
| REST POTENTIAL |
See corrosion potential and open-circuit potential. | |
| RINGWORM CORROSION |
Localized corrosion frequently observed in oilwell tubing in which a circumferential attack is observed near a region of metal "upset". | |
| RISER |
(1) That section of pipeline extending from the ocean floor up the platform. Also, the vertical tube in a steam generator convection bank that circulates water and steam upward. (2) A reservoir of molten metal connected to a casting to provide additional metal to the casting, required as the result of shrinkage before and during solidification. | |
| ROOT CAUSE FAILURE
ANALYSIS (RCFA) |
Systematic determination of why a failure (problem) occurs and what corrective action is required to eliminate this problem. | |
| RUST |
A visible corrosion product consisting of hydrated oxides of iron. Applied only to ferrous alloys. See also white rust. | |
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