![]() ![]() Unanodized aluminum has a Rockwell hardness of 38 to 44. The hardness of the aluminum is increased to a hardness of 48 to 55 on the Rockwell C scale. This oxide layer acts as an insulator and can be dyed in a wide variety of colors.Īnodizing provides surface corrosion protection along with an excellent substrate for decorative finishes. This creates extreme pitting corrosion on aluminum.Īnodizing aluminum will help protect the metal from wearing down and corroding quickly in these difficult environments where exposure to harmful elements are imminent.Īluminum anodizing is a controlled electrochemical process in which an oxide (anodic) layer is chemically built on the surface of the metal. Concrete, for example, has a pH value of around 12.5 and 13.5. The more basic or acidic the environment, the faster aluminum will break down. Pitting can also happen when the aluminum is exposed to environments beyond the 4 to 9 pH range. This type of corrosion happens when chlorides are present in the environment. Pitting corrosion also impacts the appearance of aluminum more than its functionality. Instead of creating rust, the aluminum will break down resulting in a dull appearance. Galvanic corrosion occurs when aluminum comes in contact with a precious metal such as steel and copper. Aluminum is most susceptible to galvanic and pitting corrosion. This type of corrosion begins inside the steel.Īluminum alone does corrode, but it doesn’t rust like steel. Intergranular corrosion: Also known as an intergranular attack (IGA), this corrosion occurs when the steel has been continuously exposed to heat between 8 degrees Fahrenheit. ![]() Stress corrosion cracking (SCC): Mainly an issue for austenitic stainless steel, SCC is when a crack grows on the surface of the steel.Galvanic corrosion: This type of corrosion happens when dissimilar metals are in contact with the same erosive force such as rain or condensation.Crevice corrosion: This occurs when there is a low amount of oxygen and a buildup of chlorides.Pitting corrosion: This localized corrosion occurs when the environment contains chlorides.Here are the ways stainless steel can be threatened by corrosion. That’s why stainless steel comes in different grades to protect itself given the application. While stainless steel is known for being corrosion-resistant, when it’s paired with other elements, it can respond differently when exposed to corrosive environments. See Our Anodize Capabilities How Aluminum and Stainless Steel Corrode Differently One of the main differences between the metals is how they corrode, which is an important consideration to make before manufacturing any part. However, the strength and thermal properties of stainless steel make it the preferred metal for modern buildings. Anodized aluminum is a third of the weight as stainless steel making it great for aircraft. But they both offer different qualities depending on the part you’re creating. That’s why manufacturers often turn to stainless steel as their material of choice.īoth anodized aluminum and stainless steel are great options when corrosion-resistance is paramount. Medical equipment and cookware need to be durable but easily sterilized so it’s safe to use repeatedly. This versatile metal thrives in hygienic environments. The anodized layer of protection resists corrosion and minimizes the impact of blunt forces and scratches.Īnother metal that’s manufactured to last longer is stainless steel. From the carabiners on your backpack to the iPhone in your pocket, this electrolytic anodic process is a practical method for manufacturers looking to make their aluminum stronger so it lasts longer in high-pressure situations. Anodized aluminum products are everywhere.
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