TREE-ELECTRODE SYSTEM

Epa = Passive potential Ecorr = Corrosion potential Eo3 = Oxygen evolution potential Epp = Primary passive potential Ep = Pitting potential 

The varying metallurgical parameter is the heat treatment time at 1000°C. Basically, the RSA 304 is more corrosion resistant that IM 304 due to the attributable inherent properties induced by the rapid solidification processing (RSP) and to the formation of an oxide surface film of higher quality. This passive film has been reported [7] to be an amorphous oxide compound. With respect to the corrosion rate (Cr) in familiar units, the RSA 304 exhibited 

Not aU metals and alloys show active-passive behavior as 304 stainless steel in a particular environment. Aliuninum and its alloys have the tendency to be active in most environments. Advanced alloys snch as a Ni/Mo-hase rapidly 

In addition, anodizing is a process in which aluminum and aluminum alloys are readily oxidized by an adherent and protective oxide film on the surface and further oxidation of the film is by solid state diffusion. However, these materials are active in an electrochemical environment containing sodium chloride. 

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Rg. 10,3,4 Semi cry stall tie structure of poly(ethylene), (a) Rigid crystalline and mobile amorphous domains form sandwich structures with a period of the order of lOnm. They are separated by narrow interfaciai regions with intermediate mobility. Adapted from BluK with permission from Dr, Dietrich SteinkopffVerlag. (b) Photo of an electrical tree in PE. The tree consists of a root-like system from about 10 cavities with typical diameters of 5 xm which are produced by electrical discharges. The pcncil-likc tip of the needle electrode is recognized above the tree [Salll,... 

Think of It This Way. .. with Analogies, Mnemonics, and Insights. This recurring feature provides analogies for difficult concepts (e.g., the radial probability distribution of apples around a tree) and amazing quantities (e.g., a stadium and a marble for the relative sizes of atom and nucleus), memory shortcuts (e.g., which reaction occurs at which electrode), and useful insights (e.g., similarities between a saturated solution and a liquid-vapor system). 

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