Corrosion (Chemistry)


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Corrosion (Chemistry)

  1. 1. Corrosion Is the gradual destruction of material, usually metals, by chemical reaction with its environment. Corrosion degrades the useful properties of materials and structures including strength, appearance and permeability to liquids and gases.
  2. 2. Can cause explosions. Examples of fast reaction:a. In car engines, where the fuel is ignited and it burns rapidly producing much heat.b. Sodium + water. The piece of sodium reacts vigorously with the water, dazzling onto the surface and sometimes burns with a yellow flame.
  3. 3. Slow reactions Antioxidant is a molecule that inhibits the oxidation of other molecules. Oxidation is a chemical reaction that transfers electrons or hydrogen from a substance to an oxidizing agent. Examples of slow reaction:a. The rotting of food. Your food does not rot in a matter of seconds, does it? Its a chemical reaction, yes!b. In cooking. The food does not cook that quickly... So people has been devising ways to speed up
  4. 4. Is a slow reaction which takes place betweeniron and oxygen. It is an oxidation reaction. iron + oxygen – iron oxideSteel is used for making girders that supportbridges. If the steel is not protected it soonbegins to rust.Steel is a compound of iron and carbon.Rust weakens iron and steel.
  5. 5. Warmth and salt water speeds up rusting.Can be prevented by keeping oxygen awayfrom iron and steel.Steel can be prevented from rusting by mixing itwith nickel and chromium to make the metalalloy called stainless steel.
  6. 6. Other metals andthe air Zinc is used to protect iron because it is more reactive with oxygen than iron. Copper is used as a roofing material. Coatings form on some metals when they are exposed to the air. The surface of bronze, which is an alloy of tin and copper, develops a thin green film over a long time. This coating is called patina.