There are various methods to prevent corrosion. We will discuss some of the popular ones below.
It is a process by which a metal (I) is coated with a thin layer of another metal (II) using electrolysis. In this way, the new metal coating protects the metal (I) from corrosion.
In this process, (metal II) is kept as the anode and metal (I) (metal to be plated) is kept as the cathode. i.e, metal ‘I’ is connected to the negative terminal and metal II is connected to the positive terminal.
These 2 electrodes are immersed in an electrolyte and when power is supplied, oxidation happens in the anode, thereby dissolving metal II ions in the electrolyte. These dissolved metal II ions are reduced at the cathode thereby providing a coating on metal I. The metals most commonly used as the anode are Copper, Nickel, Gold, Silver, Zinc. Etc.,
- Cathodic Protection
In this process, the base metal is connected to a sacrificial metal that corrodes instead of the base metal. By doing so this sacrificial metal (which is more reactive than the base metal) will give out electrons and get oxidised. The ions thus formed takes part in the corrosion reactions thereby saving the base metal.
This process involves coating iron with a thin layer of zinc. It is generally done by dipping iron in molten zinc. The zinc layer coating thus protects the iron from corrosion.
- Painting and Greasing
Providing a layer of paint or grease on the metal can prevent the exposure of the metal with the external environment thereby preventing corrosion.
- Using Corrosion Inhibitor
Corrosion inhibitors are chemicals which when added to the corrosion environment has the ability to cut down the rate of corrosion.
- Make use of the Right Material
Choosing the right material can also help prevent corrosion. Eg: Aluminium and stainless steel are highly corrosion resistant