Zinc and aluminium are very high in the metal activity series,yet they resist corrosion to a great extent .Explain?

Question

Answer

Once the metal is coated with Zinc or Aluminium oxygen and water vapour in the atomsphere react with Aluminium and and Zinc to form their respective oxide which are non reactive ,and forming a non reactive coating around the metal, hence covering the iron or any reactive metal and protecting it from corrosion.

Answer

On coming in contact with air these metals form an oxide layer which sticks to the metal surface and thus the inner metal doesn't come in contact with air procting it from corrosion . This the reason why zinc is galvanized over iron.

Answer

Introduction
Zinc and aluminium are both high in the metal activity series, which means they have a strong tendency to lose electrons and form positive ions. This would normally make them highly reactive and prone to corrosion. However, in reality, both metals are known for their corrosion resistance. This can be attributed to a number of factors.

Passivation
One reason why zinc and aluminium are resistant to corrosion is because they form a passive layer on their surface. When these metals come into contact with air or water, they react with the oxygen or hydroxide ions to form a thin layer of oxide or hydroxide on their surface. This layer acts as a barrier, preventing further corrosion from occurring.

Self-healing
Another reason why zinc and aluminium are resistant to corrosion is because they are capable of self-healing. If the passive layer on their surface is damaged or removed, these metals will react with the environment to form a new layer. This process can occur repeatedly, which allows the metal to resist corrosion over a long period of time.

Alloying
Zinc and aluminium are often alloyed with other metals to improve their corrosion resistance. For example, zinc is commonly alloyed with copper to form brass, which is highly resistant to corrosion. Aluminium is often alloyed with copper, zinc, or magnesium to form alloys that are also highly resistant to corrosion.

Conclusion
In conclusion, while zinc and aluminium are very high in the metal activity series, they are resistant to corrosion due to a combination of factors including passivation, self-healing, and alloying. This makes them ideal for a wide range of applications, including construction, automotive, and aerospace industries.

Similar Class 10 Doubts

The most abundant metal in the earth's crust is oxygen or aluminum .some are saying it's aluminium some oxygen.oxygen has 46% mass in crust, right? Just tell me the right ans I'm pretty confused?

Which metal can be used in spite of high reactivity aluminium for making husehold utensils and why?

tricks to learn activity series?

why extraction what would you group hg into ?high or low Related: Extraction of Metals low in the Activity Series - Metals and Non Metals, Class 10, Science

Even though zinc has a valency of 2 and Aluminium has a valency of 3 then why is aluminum placed above zinc in reactivity series?

Top Courses for Class 10View all

Science Class 10

Social Studies (SST) Class 10

Mathematics (Maths) Class 10

English Grammar Advanced

English Grammar Basic

Top Courses for Class 10

Top Courses for Class 10

Suggested Free Tests

Related Content

About Class 10

Class 10 Study Material

Class 10 All Subjects

NCERT Textbook Solutions

Other Classes

Important Links

Company