Oxidation Resistance

Oxidation Resistance

 

(resistance to sealing), the ability of metallic materials to resist chemical degradation of the surface caused by the action of air or other gaseous mediums at high temperatures.

The oxidation resistance of a metal or alloy in an oxidizing atmosphere is determined by the properties of the oxide layer—scale—that forms on the surface of the metal and inhibits the diffusion of gas into the metal, thus reducing the development of gaseous corrosion. The quantitative characteristics of oxidation resistance are the increase in the weight of the sample being studied (because of oxygen uptake by the metal), or the weight loss after removal of the scale from the surface of the sample, relative to a unit surface and the duration of the experiment. The condition of the surface of the sample or part is simultaneously taken into account; it may differ qualitatively even though its quantitative characteristics may be the same. Along with heat resistance, oxidation resistance is a basic criterion of the suitability of a given material for high-temperature service.

References in periodicals archive ?
Tenders are invited for stain less steel electrodes size:-4.00x350mm ylelding a well deposit of 25 cr,12NI,2.5MO,which good oxidation resistance upto 1050 c ideally suited for welding 18-11 MO type steel to mid steel welding clad side of 18-H NO clad steel ,buffer layers etc.
To verify the excellent oxidation resistance predicted by the thermooxidative DSC data, latex cast films of polymers AR, CR, DR and FR were prepared and evaluated for both their initial and aged physical properties.
It is suggested that the influence of Mg as an alloying element from the addition of filler metal on the oxidation resistance is mainly to lower the defect associated in the [Al.sub.2][O.sub.3] layer as discussed by Nylund et al.
Perodua said that the new engine oil that will be on sale from September, is made with enhanced oxidation resistance, major protection against carbon deposits, improved wear protection and accelerated performance over the oil service life that is 10,000 km or 6 months.
Where oils with very good chemical stability and oxidation resistance are required, expensive perfluoro polyether, polychloro-trifluoroethylene and fluorosilicon fluids are used.
Under the direction of EPRI, an electric utility research group in Palo Alto, Calif., Southwest Research Institute (SwRI), San Antonio, has developed a software code for predicting the remaining oxidation life of protective coatings that impart oxidation resistance to hot-section combustion turbine components.
The OR fluid is said to offer up to 10 times the oxidation resistance of competitive fluids, according to the literature.
The advanced powder metallurgical wire in the cassettes exceeds all other types in terms of process reliability, energy savings and lifespan, thanks to its unique properties, which include exceptional form stability and oxidation resistance.
OR fluid is said to offer up to ten times the oxidation resistance of the nearest competitor, according to the manufacturer.
Liu, "Effect of aluminum on high temperature oxidation resistance of 310S steels," Iron and Steel, vol.
Electrographite is generally softer and weaker than carbon-graphite, but it has superior chemical resistance, oxidation resistance, and thermal conductivity.

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