CNC Titanium Parts

The colorful surface of titanium products is formed due to the oxidation of the surface, resulting in the formation of titanium dioxide. The titanium dioxide oxide film reflects light differently based on its thickness, producing various colors. Titanium coloring oxidation processes include atmospheric oxidation, anodizing, and deposition. Today, we will introduce the widely used anodizing method. In titanium anodizing, titanium or its alloys are placed as the anode in a corresponding electrolyte solution (such as sulfuric acid, chromic acid, oxalic acid, etc.). Under specific conditions and the influence of an applied electric current, electrolysis takes place. The titanium or its alloy at the anode undergoes oxidation, forming a thin layer of titanium oxide on the surface. The thickness of this oxide layer ranges from 5 to 30 micrometers, and the hard anodized film can reach up to 25 to 150 micrometers. After anodizing, titanium or its alloy exhibits increased hardness and wear resistance, up to 250-500 kg/square millimeter, excellent heat resistance with a high melting point of 2320K for the hard anodized film, excellent insulation properties withstanding voltages of up to 2000V, and enhanced corrosion resistance lasting for thousands of hours in a salt spray environment. The thin oxide film formed during anodizing contains numerous micro-pores capable of adsorbing various lubricants, making it suitable for manufacturing engine cylinders or other wear-resistant parts. The strong adsorption capacity of the film’s micro-pores allows it to take on various beautiful and vibrant colors. Anodizing can be applied to colored metals or their alloys (such as titanium, magnesium, etc.) and finds widespread use in mechanical parts, aircraft and automotive components, precision instruments, radio equipment, daily necessities, and architectural decoration. Typically, titanium or titanium alloys are used as the anode, with lead plates as the cathode, both immersed in an electrolyte solution containing sulfuric acid, oxalic acid, chromic acid, etc., for the electrolysis process, forming an oxide film on the surfaces of titanium and lead plates. For products made of pure titanium, a dense oxide film naturally forms on the surface, providing excellent corrosion resistance in various environments at room temperature, eliminating the need for coatings. Pure titanium kettles, for example, demonstrate strong corrosion resistance outdoors, being unaffected by weak acids or alkalis. Whether exposed to river water or rain, rocks or vegetation, the pure titanium kettle can come into direct contact without corrosion. As there is no coating on the entire kettle body, it exhibits the unique gray color of pure titanium products and can be heated directly over a heat source to display vibrant colors. The dazzling colors of a titanium kettle arise from the thin, naturally formed oxide film (titanium and titanium dioxide) covering the metal’s surface. This thin film, also known as titanium rust, acts as a prism due to its high refractive index, causing light to refract and absorb different wavelengths, resulting in various colors. By artificially adjusting the thickness of this oxide film to 8-10 micrometers, thousands of similar colors can be displayed depending on the wavelength. Because this film is a high refractive index transparent film, it can exhibit a rich array of colors.