Discussion 5.3.docx - Discuss any u2018newu2019...

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Discuss any ‘new’ information you discovered while learning about the fatigue or corrosion of metals used in aircraft construction. Pick three or four of these items and explain your thoughts on how this topic applies to aviation safety. Referred to as the natural disintegration of a material as it is attacked by one or more substances in its environment, corrosion of metal is a major problem in aircraft construction. This is because such a phenomenon can reduce the strength and ductility of various aircraft structural components, turning strong metals into weak metallic hydroxides, sulfates, or oxides (Wood & Sweginnis, 2006). But, while corrosion is widely known for the damage it can impose on aircraft structures, there was new material that I learned in this module. The first item I discovered as new material was pitting corrosion. Only identified in small areas of a metal’s surface, this form of corrosion is caused by electrolytic corrosion and results from a galvanic attack of dissimilar metals on the surface of an alloy (Siddiqui, 2015). But why this form of corrosion is distinct to others like surface corrosion, is because the galvanic action and electrolytic corrosion generate pitting effects or relatively small holes that randomly localize on the metal surface and may be accompanied by powdery residue. This may seem insignificant because such impacts only affect a small percentage of the metal surface, but, to my surprise, pitting is one of the most subtle yet dangerous forms of corrosion. Due to the fact that pitting, deeply penetrates the metal in a branching manner and causes perforation (Wood & Sweginnis, 2006). Effectively, this jeopardizes aviation safety as not only does pitting corrosion lead aircraft equipment to fail at a sudden rate but it is also difficult to predict and measure since pits can mature in service after several months or a year (Siddiqui, 2015). Another item that I discovered as new was exfoliation, which is a severe form of intergranular corrosion that occurs along the grain boundaries of a metal. To be specific, the types of grain boundaries that are attacked by this corrosion generally have an elongated flat-type structure such as thin plates and thick sheets (Solti & Schekler, 2019). Normally, exfoliation corrosion will initiate along the edge of a metal and this causes it to be concealed from view, expose more grain boundaries per unit area than the surface, and has the potential to collect additional moisture and contaminants (Wood & Sweginnis, 2006). So as this corrosion can move hidden along the flattened or elongated grain boundaries, whereby the grain shape will naturally restrict the progress parallel to the surface, the eventual result will be the swelling, leafing-out, or bulging of a metal component (Siddiqi, 2015). Ultimately, this indicates major applications

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