Corrosion (Part - 17) - Metals & Non-Metals, Science, Class 10 Video Lecture

Ans. Corrosion is the process of gradual deterioration of metals due to chemical reactions with their surrounding environment. It occurs when metals come in contact with substances such as water, oxygen, or acids, leading to the formation of metal oxides or salts on the metal surface, which weakens and damages the metal over time.

Ans. Different metals have varying degrees of susceptibility to corrosion. Generally, metals such as iron, steel, aluminum, and copper are highly susceptible to corrosion. However, some metals like gold and platinum are highly resistant to corrosion and do not easily undergo this process.

Ans. There are several methods to prevent or minimize corrosion. These include: 1. Coating: Applying a protective layer of paint, enamel, or a metallic coating like zinc or chrome can help prevent direct contact between the metal and the corrosive substances in the environment. 2. Galvanization: Coating a metal with a layer of zinc through a process called galvanization helps protect it from corrosion. Zinc reacts with oxygen and moisture in the air, forming a protective layer that prevents direct contact between the metal and corrosive agents. 3. Alloying: Adding small amounts of corrosion-resistant metals, such as chromium or nickel, to the base metal can improve its resistance to corrosion. 4. Cathodic protection: By connecting the metal to a more easily corroded metal, such as magnesium or zinc, the more easily corroded metal will corrode instead, protecting the main metal. 5. Regular maintenance: Promptly repairing any damaged coatings, removing accumulated dirt or debris, and ensuring proper drainage can help minimize the chances of corrosion.

Ans. Corrosion can have several detrimental effects on metals. Some of the common effects include: 1. Weakening: Corrosion gradually weakens the metal by removing material from its surface. This can lead to structural failures, especially in load-bearing structures. 2. Reduced lifespan: Corroded metals have a shorter lifespan as they become more prone to breakage, deformation, or failure. 3. Decreased functionality: Corrosion can hinder the performance of metal objects or structures. For example, corroded pipes may experience reduced flow capacity or leakage. 4. Aesthetic degradation: Corrosion can cause discoloration, pitting, or roughening of metal surfaces, affecting their appearance and value.

Ans. No, non-metals do not undergo corrosion. Corrosion is a specific term used for the degradation of metals due to chemical reactions. However, non-metals can undergo degradation or deterioration through other processes, such as weathering or decomposition.