Corrosion:

Corrosion is a natural process that occurs when metals react with their environment and undergo a chemical or electrochemical transformation. It is a slow and gradual deterioration of materials, primarily metals, due to various external factors such as moisture, oxygen, and other corrosive substances. Corrosion can affect a wide range of materials, including iron, steel, aluminum, copper, and their alloys.

Causes of Corrosion:
Corrosion can be caused by several factors, including:

1. Moisture: The presence of water or moisture is a significant contributor to corrosion. It provides the necessary medium for chemical reactions to occur between the metal and the surrounding environment.

2. Oxygen: Oxygen in the air reacts with the metal surface, leading to the formation of metal oxides. This process, known as oxidation, is a common form of corrosion.

3. Acids and Salts: Acids and salts present in the environment can accelerate the corrosion process. They can react with the metal surface, leading to the formation of corrosive compounds.

4. Temperature: Higher temperatures can accelerate the corrosion rate, as the chemical reactions occur at a faster pace.

Types of Corrosion:
Corrosion can manifest in various forms, including:

1. Uniform Corrosion: This is the most common type of corrosion, where the metal surface is uniformly attacked and thins out over time.

2. Pitting Corrosion: Pitting corrosion occurs when localized areas on the metal surface become more susceptible to corrosion, resulting in small pits or holes.

3. Galvanic Corrosion: Galvanic corrosion occurs when two dissimilar metals are in contact in the presence of an electrolyte. The more active metal corrodes while the less active metal remains protected.

4. Crevice Corrosion: Crevice corrosion occurs in confined spaces or crevices where there is limited access to oxygen or stagnant water.

Burning:

Burning, also known as combustion, is a rapid chemical reaction that occurs between a fuel source and an oxidizing agent, typically oxygen. It involves the release of heat and light energy, accompanied by the formation of new chemical compounds. Burning is an exothermic process, meaning it releases energy in the form of heat.

Process of Burning:
Burning involves three essential components:

1. Fuel: The fuel is the substance being burned. It can be a solid, liquid, or gas, such as wood, gasoline, or natural gas.

2. Oxygen: Oxygen is the oxidizing agent required for combustion. It reacts with the fuel to produce heat and new compounds.

3. Heat: An initial heat source is required to initiate the combustion process. Once started, the chemical reaction becomes self-sustaining and releases more heat.

Key Differences:

1. Chemical Reaction: Corrosion is a slow, gradual chemical or electrochemical reaction between metals and their environment, while burning is a rapid chemical reaction between a fuel and an oxidizing agent.

2. Energy Release: Corrosion does not

burning is a chemical change and a exothermic process which happens in presence of oxygen...but corossion is also a chemical change also known as rusting but is not exothermic...it also happens in presence of oxygen...corrosion can be prevented by galvanisation