Different Methods Of Galvanization

Different Methods Of Galvanization

Posted on November 11, 2022

Galvanization is the process of applying a protective coating to steel or iron in order to prevent it from rusting. There are several different methods of galvanization, each with its own advantages and disadvantages. In this blog post, we’re going to take a look at some of the most common methods of galvanization. By the end of this post, you should have a good idea of which type of galvanization is best suited for your needs.

The Process Of Galvanization

One of the most important processes in manufacturing is galvanization. This process is used to prevent rust from forming on metal surfaces.  This is done by placing the metal in a bath of molten zinc or other galvanizing agent. The metal absorbs some of the protective coating, thus preventing rust from forming.

Hot Dipped Galvanization

Hot Dipped Galvanization involves dipping steel or iron items into a hot zinc bath. This process gives the items a protective coating that prevents rusting. The process protects metal against corrosion by providing a barrier between the metal and the atmosphere. Hot-dipped galvanized coatings can last for decades if properly maintained. Some drawbacks of hot-dipped galvanization include the need for specialized equipment and the risk of harming the environment if not done correctly.

Advantages of Hot Dipped Galvanization

1. One of the main advantages of hot dipped galvanization is that it provides a very strong and durable protective coating.
2. The process is relatively inexpensive, making it an ideal method for large-scale production.
3. Hot dipped galvanization can be used on a wide range of metal items, including fences, bridges, and roofs
4. Hot dipped galvanization is one of the most common methods of galvanization, meaning that it’s relatively easy to find a company that offers this service.

Disadvantages of Hot Dipped Galvanization

1. One potential disadvantage of hot-dipped galvanization is that the process can be quite harmful to the environment if not done correctly.

Electroplating

Electroplating is another common method of galvanizing metal surfaces. This method is often used to create decorative coatings on metal items, but it can also be used for practical purposes such as protecting against rusting.  It involves placing the metal in an electrolyte solution and running an electric current through it. The anodes are then coated in a protective layer of zinc, which prevents corrosion. However, this method is less effective than hot-dipping due to the relatively thin coating that forms on the metal surface.  Electroplating process protects metals from corrosion and gives them a lustrous appearance.

Advantages of Electroplating

The main advantage of electroplating is that it can form a very thin layer of zinc on the metal surface, which protects against corrosion without sacrificing too much strength.

Disadvantages of Electroplating

1. One potential disadvantage of electroplating is that the protective coating may not be as strong as other methods, such as hot-dipping.

Other methods of protecting metals from corrosion include sherardizing and thermal spray. 

Sherardizing

Sherardizing involves the heating of the object in an airtight container that has zinc powder. A thermal diffusion process occurs and the zinc diffuses into the object’s metal surface, forming the zinc-iron alloy. The zinc-iron alloy has better corrosion resistance than the object’s original metal surface.

Thermal Spray

The process of metallizing, also known as thermal spraying, involves feeding a material wire or powder into a spray gun. This melts the substance before spraying it onto a work piece. Thermal spraying has been shown time and time again to be an effective method of preventing corrosion by creating a layer barrier between the steel and potential corroding agents.

Thermal spraying is a great way to protect large items that can’t be dipped in galvanizing baths, as the coating can reach structures that are already installed.

Conclusion

There are several different methods of galvanization, each with its own advantages and disadvantages. The best method for your project will depend on the specific needs of the project. Whichever method you choose, galvanization is an effective way to prevent corrosion and extend the life of your metal products.