Anodizing – Improving the Surface
The electrolytic passivation technique that is utilized to improve the thickness of the oxide layer of a metal or metal object is called anodizing. Throughout the years, the popularity of anodized metals has increased tremendously. The reason why this process is gaining recognition the world over is because it helps improve corrosive and wear resistance of an object. Some experts also claim that anodized metals have better adhesive properties for glues and paint primers than bare metals. Do not think that this process only has commercial or industrial purposes. There are also products that are made of anodized metals that can be used for home and personal use.
Anodized aluminum is now becoming more appealing than steel in the manufacturing sector. It seems that anodizing aluminum gives the metal more attractive properties, such as non conductivity and much lighter weight. Moreover, this technique also makes the surface of aluminum stronger than ever. So how is aluminum anodized? Basically, aluminum products are submerged in a vat of electrolyte, also known as sulfuric acid, and then low-voltage electricity is run through the solution. One of the most popular uses of anodized aluminum is in expensive cookware, such as pots and pans, primarily because heat is evenly distributed in such material.
Anodized aluminum is also used in the manufacturing sector. However, builders and manufacturers prefer aluminum that has undergone hard anodizing process. The difference between normal anodizing and the hard processing is that, in the latter, the acid solution is cooled at about freezing point and the electric current used is much higher. After aluminum has undergone this process, the resulting object is considered as strong or tough as diamond. In fact, many buildings and structures now use anodized aluminum in areas where metal frameworks are exposed to the rays of the sun, rain, and other environmental elements.
It is important to note that hard anodizing is more often used in commercial and industrial applications. However, it is not impossible for you to see some products, such as pans and pots, which may have endured hard anodizing. Apart from producing tougher and stronger anodized aluminum, hard anodizing is also known to provide thicker aluminum oxide coating. More often than not, you will know that aluminum sheets have undergone hard anodizing because they usually have a black or dark brown surface. However, since this process makes it easier for paint dyes to get absorbed by metals, it is very easy to paint anodized aluminum sheets with various colors.
