Black anodizing is a special type of anodizing that produces black metal with benefits beyond ordinary anodizing. Two methods of dyeing metal for black anodizing are using inorganic salts or organic black dye. Black anodized metals perform best in areas of high light and heat and resist wear and corrosion better than other colors. The use of black anodizing is suitable for spacecraft, optical devices, and medical equipment that must withstand high temperatures and powerful cleaning chemicals.
Black anodizing is a special type of anodizing that produces black metal that often has benefits beyond ordinary anodizing. One way to dye metal for black anodizing is to use inorganic salts obtained from metals that make the metal black, and the second way is to use an organic black dye; organic tincture typically offers limited benefits. A major benefit of this anodizing is that the black dye performs best in areas of high light and heat. Metal also tends to corrode much more slowly than metal that has been subjected to regular anodizing.
The simplest and least cost effective black anodizing method is to use regular black dye. This is applied directly after the metal has been anodized, and while the metal will receive more benefits than normally dyed anodized metals, the benefits will not be as powerful as the other anodizing method. The dye does not change the structure of the anodized metal, so the benefits are limited and weaker than other black anodized metals.
While more difficult to do, the second black anodizing method involves the use of metallic salts. These can be added after the anodizing process, which is the most common way, or they can be added during the anodizing process. Salts are typically needed to keep the anodizing process stable, but this type of anodizing will require the use of special blackening salts. Salts are able to change the structure of the metal, so the effects are much stronger than the metal blackened by the dye.
Anodized metals are typically subject to demanding and dangerous environments that have high heat and powerful light. While regular anodized metal can pass through these environments quite well, black anodizing better prepares the metal by allowing it to remain unscathed by heat and light. This allows the anodized metal to be used for spacecraft, optical devices that cannot afford metal bleaching, and medical equipment that must withstand high temperatures and powerful cleaning chemicals.
Another benefit of using black anodizing is better resistance to wear and corrosion. This occurs because of the sealant used to keep the black dye or salt bonded to the metal, and because the black color forms a better barrier on the metal than other colors. This means that anodized metals are better under extreme conditions and do not corrode when used as semiconductors or other products that are constantly exposed to high amounts of electricity.
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