Question

what is corrosion? What are it causes?​

Answer 1

Answer:

Explanation:

Corrosion is an electrochemical reaction that appears in several forms, such as chemical corrosion and atmospheric corrosion, the latter of which is the most common form. When acidic substances (including water) come in contact with metals, such as iron and/or steel, rust begins to form

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Answer 2

The chemical deterioration of a material, usually a metal or metal alloy, is called corrosion. The most common causes of corrosion are contact with water and oxygen, though other substances in the earth and in the atmosphere can also cause corrosion. The material with the greatest economic importance that is most affected by corrosion is iron. The corrosion of iron is called rusting.

The corrosion of metals such as aluminum, tin, copper, and zinc generally stops after a thin layer of metal oxide forms on the exposed surface of the metal. This layer serves as a barrier to further contact with oxygen. Even when iron combines with oxygen, a thin, almost invisible coating of iron oxide forms that prevents further rusting when no water molecules are present. When water is present, however, the oxide that forms is bulky and porous, allowing oxygen continued access to the iron below.

Other metals also corrode slightly under normal atmospheric conditions. Copper and its alloys brass and bronze are protected from continuous and penetrating corrosion by the formation of a green patina, or film, called verdigris, which is composed of copper carbonate. In many instances buildings with copper-clad roofs and trim are deliberately allowed to develop patinas because the color is considered attractive.