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FINAL REVIEW Stony Brook University ESG 332

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PRACTICE EXAM 1) Define the following terms and provided illustrations to support your answer: a) anodic and cathodic processes in aqueous corrosion (redox reaction) -The anodic process involves the oxidation of a met ...

PRACTICE EXAM 1) Define the following terms and provided illustrations to support your answer: a) anodic and cathodic processes in aqueous corrosion (redox reaction) -The anodic process involves the oxidation of a metal layer that is more susceptible to corrosion in an aqueous environment than the metal that it is covering in which a metal loses electrons and becomes a metal ion. The oxidation supplies electrons to the underlying metal, making it a cathode and protecting it from corrosion. -The cathodic is a reduction reaction in which a chemical species gains electrons. (expand on this) b) pitting corrosion -Pitting is a form of very large localized corrosion attack in which small pits or holes form. (such as scratches or surface defects.) -Oxidation occurs within the pit itself, with complementary reduction at the surface. 1 -It is supposed that gravity causes the pits to grow downward, the solution at the pit tip becoming more concentrated and dense as pit growth progresses. c) galvanic corrosion -Galvanic corrosion occurs when two metals or alloys having different composition are electrically coupled while exposed to an electrolyte. -The less noble or more reactive metal in the particular environment will experience corrosion (i.e., oxidation); the more inert metal, the cathode, will be protected from corrosion (experience reduction). 2 d) intergranular corrosion -Intergranular corrosion is corrosion that occurs preferentially along grain boundaries (between grains) for some alloys and in specific environments. The net result is that a macroscopic specimen disintegrates along its grain boundaries. -This situation can happen in otherwise corrosion-resistant alloys, when the grain boundaries are depleted of the corrosion-inhibiting elements. This is known as grain boundary depletion. -A precipitate containing the corrosion-resistant element diffuses away from the bulk and to the grain boundary and forms a precipitate along the grain boundary. As a result, depleted zones form adjacent to the grain boundaries (this process is called sensitization). These depleted zones are no longer composed of the corrosion-resistant element, making these regions around the g

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