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Black oxidation treatment is a common method of chemical surface treatment. The principle is to create an oxide film on the metal surface to isolate the air and achieve rust prevention. When the appearance requirements are not high, blackening treatment can be used. The blackening treatment on the surface of steel parts is also called bluing. Black oxidation treatment is a surface coating method commonly used on military knives because it can eliminate reflections.

"What is anodization? Anodic oxidation is the electrochemical oxidation of metals or alloys. The process in which aluminum and its alloys form an oxide film on aluminum products (anodes) under corresponding electrolytes and specific process conditions due to the action of applied current. Anodizing, unless otherwise specified, usually refers to sulfuric acid anodizing."

Carbon steel is an iron carbon alloy with a carbon content ranging from 0.0218% to 2.11%. Generally, it also contains small amounts of silicon, manganese, sulfur, and phosphorus. The higher the carbon content, the greater the hardness and strength, but the lower the plasticity.