Oxidation moderate temperature protection using

The oxidation of hydrocarbon polymers resembles the oxidation of low-molecular weight (MW) hydrocarbons, with the polymer having its own internal source of peroxide initiators present. By making the assumption that peroxides are present in even the most carefully prepared raw mbber, the ease of oxidation of mbber at low to moderate temperatures can be understood. Therefore, it is extremely important to compound mbber for extended oxidation resistance through the use of protective additives and to be aware of pro-oxidant impurities present in the mbber or the mbber compound. 

In many high temperature applications in the electrical and electronics industry, the refractory metals arc protected by a vacuum or an inert gas, so that oxidation is not a problem. However, for most other high temperature applications, poor oxidation resistance has limited use. The oxides ol [he refractory metals, rather than existing as tight, protective barriers, stiller from porosity at moderately elevated temperatures, volatility at higher temperature, and spalling of ihe oxide scales away from the substrate, especially al corners and edges. 

Moderate temperature oxidation protection using nanocrystalline structures... 

Vitamin A is soluble in oils and fats. The vitamin is not easily destroyed by heat but is readily oxidized. Preparations must, therefore, be protected from oxidation and are prepared in an atmosphere of carbon dioxide or nitrogen. In the absence of air, vitamin A is unaltered at moderate temperatures. The creams and lotions must therefore be free of oxidases, and perfumes must be free of peroxides. The addition of antioxidants is useful to maintain stability. Pure vitamin E is effective as an antioxidant in lipid solutions of vitamin A. 

Steel is aluminized (i.e., coated with aluminum) by hot dipping or spraying and, to a lesser extent, by cementation. Molten baths of aluminum for hot dipping usually contain dissolved silicon in order to retard formation of a brittle alloy layer. Hot-dipped coatings are used for oxidation resistance at moderately elevated temperatures, such as for oven construction and for automobile mufflers. They are unaffected by temperatures up to 480°C (900°F). At still higher temperatures, the coatings become refractory, but continue to be protective up to about 680 °C (1250 °F) [34]. 

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