when catholic, which is a negative point of polarity.

when asking what corrosion is many people will most often think of rust. However rust and corrosion are not exactly the same. they are both very similar  in effects and how they get onto different types of materials, but are not the same in processes. The different materials will be aluminum copper, and steel, which are all known to have different reactions to acid and conditions known to cause corrosion. each material can be placed ion jar or cup halfway covered in vinegar to simulate the effects of erosion and what they will look like. Corrosion, which is an electrochemical change of a metal or other materials is a process of oxidation on the outer surface. This change is from the element Fe to Fe+2, and further to Fe+3. When people think of corrosion, or rust, they think of a thin layer or sheet of cut on the outer layer of metal. Copper and aluminum both have different ways of being corrosion resistant and how much carbon the metal contains. Steel is also more likely to rust in conditions that aluminum would not rust or corrode. This chemical change can occur from either grasses or liquids, and the speedo f the process is increased by warmer temperatures and salts. Corrosion is a degradation of a material that occurs from the interaction between itself and its environment. This process occurs when an anode, or a positive post of polarity flows to a catholic, which is a negative point of polarity. This process is also the same as a batter when the negative and positive charges flow from terminal to terminal. Since people have been using metal as a material for building things or tons we have wondered what corrosion comes from. Most discoveries of metal and corrosion were made in the early twenties century. Some of the first studying of corrosion, how ti occurs and what it affects was conducted by a man named A.T. Lincoln during the first 20 years of the twentieth century. He would present a presidential address in 1908 titled “Corrosion of Iron from the electrochemical standpoint” which was one of the first scientific document son corrosion and rust. In the 1930s a man named Carl wagner proved that dry oxidation was in fact an electrochemical process, and that oxidation did not require the anodic and cathodic layers to separate from each other. These men were some of the first to study in this field and made new discoveries that had not yet ben made, that have helped develop ways to prevent rust and corrosion. The lit of requirements for this process to begin is very short. For example, having only some steel dust and oil or moister on top of the material is highly probable for having corrosion begin. When this process enters its advanced stages the surface will rust or patine which creates a  layer that covers the surface and an go deeper into the metal if it continues. Depending on what type of metal it is that has become oxide, it may have different effects on color of the oxidation layer. Copper of example will begin to go to a light brown before turning to a bluish green. Aluminum has a different form of corrosion that is much harder to see, and has different effects. The corrosion on aluminum will actually prevent further hard and corrosion, and is somewhat hard to see, due to the fact that is is a dark gray. When steel corrodes it appears to be what most people think of and visualize when they think of rust and corrosion. Steel will develop a orange/brown layer of oxidation that can occupy up to six times the volume of the original material. Some people that have problems  with corrosion of anything that they might have, will often try to find protectant of metal that prevent corrosion. Some of the methods are galvanizing the metal, or copper plating, due to their high resistance to corrosion, Galvanization is a process that puts zinc into the outer layer that blocked the metal from being corroded. If corrosion  is already on the surface then there ar always was that the corrosion can be removed. 

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