Anodizing coating is a layer of charged oxygen on metal that makes it harder and easier to maintain. It requires acid, electricity, and a sealant. There are four types of anodized coating, and not all metals can be anodized. Iron and steel cannot be anodized because they rust in the presence of oxygen.
An anodizing coating is a layer of molecules that is placed on the surface of a metal to help it last longer. This metal becomes easier to maintain and is usually much harder than metal without an anodized coating. To give the metal this coating requires the use of a sealant, acid, and electricity; otherwise, the whole process will not provide a proper finish. Depending on how it is done, the anodized metal may look different. Almost any metal, except those that refuse to integrate with oxygen or have difficulty doing so, can be anodized.
Unlike many coatings and finishing materials, an anodized coating is not artificial. It is a layer of charged oxygen, or oxide, that forms on the surface of the metal. This thin layer adds some benefits, such as being harder and stronger than metal without the coating. Metal that has been anodized is also easier to maintain due to the coating. Without a coating, some metals tend to crack or crack, but this coating keeps the metal smooth and easier to use.
Three things are needed to apply an anodized coating to metal: oxygen-filled acid, electricity from a cathode, and a sealant such as water or a nickel-based solution to keep the layer permanent. After a dip in the charged acid, the metal is removed and placed in the sealant. This is usually easier than other veneering methods and is also typically cheaper.
There are four classifications of anodized coating, based on how strong it is and what is done to anodize the metal. Both Type IA and Type IB are thin layers that are exposed to a small amount of electricity and are useful for making general parts. With a type II coating, a little more electricity is used and the acid is much stronger. The last type, Type III, is the hardest coating and requires the anodizing process multiple times with a solution similar to the Type II coating.
Most metals are capable of taking an anodized finish, but not all. If the metal refuses to interact, or has a hard time integrating, with oxygen, then the metal cannot be used. Iron, steel and any other ferrous or iron-containing metal cannot be anodized because, while iron reacts with oxygen, it rusts in its presence.
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