Titanium surface coloring technology
In recent years, due to the appearance of color titanium, its use has been expanded to architectural decoration, daily decoration and stationery and so on. Because of this titanium, not only those features mentioned above, but also add decorative effects and artistic value.
1, color titanium color principle
Color titanium surface has a layer of titanium oxide as the principal component of the oxide film. This transparent film, the light has a considerable refractive index, can strongly reflection and refraction of light. In general, the surface of titanium has a thin oxide film, about 5 to 70 angstroms, because it is watery, does not interfere with the light effect, so usually the surface of titanium and will not be colorful, only silver gray. However, if the proper treatment of titanium, titanium surface will add a few hundred angstroms thick oxide film. At this moment, if the light is re-radiated into the film, the light reflected from the film surface will interfere with the light reflected from the surface of the under-film substrate to obtain a beautiful and beautiful interference color. This is the color titanium color principle. Practice has proved that with the oxide film thickness of different, can show yellow, green, gold, pink, black and other different colors, make titanium become brilliant.
2, color titanium coloring technology
From the current situation, the color of titanium coloring techniques is the following 2 kinds.
① Heating oxidation method. The titanium is heated in an oxygen-containing atmosphere and its surface forms a thick film of oxide which gives rise to different shades of yellow to cyan and violent in turn.
Color technology called "atmosphere heating oxidation method", referred to as "heating oxidation method." Its advantage is that the titanium can be colored in a large amount at minimal cost, and the adhesion between the oxide film and the substrate is good. The disadvantages are less color variation, poor uniformity and reproducibility of tone, and difficulty in control. In addition to heating in the oxygen-containing atmosphere coloring, but also in the nitrogen atmosphere heating coloring, known as the "heating nitriding method." At this point, as long as the heating above 750, the soft surface will appear golden yellow titanium nitride film. Advantages of this approach is the case that in addition to the decorative effect, but also can improve the sexual wear resistance, the disadvantage is the color monotonous, only pink gold.
② Titanium anodizing method. Titanium is placed in the electrolyte and authorised to act as an anode. A voltage is applied to the titanium anode and stainless steel or aluminum cathode to form an oxide film on the titanium anode by an electrochemical reaction. People call this coloring technology "titanium anodizing", also known as "electrolytic oxidation coloring." Anodizing the electrolyte used in aqueous, non-aqueous and molten salt solution. Generally, an aqueous solution of phosphoric acid, boric acid and its salt acts as an electrolyte, and a relatively thick oxide film can be formed. When a molten salt aqueous solution and a non-aqueous solution are used as the electrolyte, relatively thin oxide film can be formed. The latter due to greater resistance, electrostatic wear, leakage current is small, is a high-dielectric film used in the electronics industry. Practice has proved that in the anodization process, the electrolyte concentration and temperature, the current density and other effects on the oxide film is not large, but the applied voltage has a great impact on it, the oxide film thickness and applied voltage Is proportional. Compared with the former two kinds of coloring technology, titanium anodizing method has the advantages of rich hue, calm control of hue, high strength of oxide film and good corrosion resistance, so it is considered as one of the most promising coloring technologies.
At present, the titanium alloy anodizing method has been widely used in high-rise building decoration, including the decoration of the external walls and curtain walls, roof decoration, etc.; daily necessities, including decorations, including pins, buttons, belt buckles, Landscaping sporting goods, including tennis racket and so on. China is full of titanium resources, through the study of color titanium, we can certainly develop more high value-added titanium products.
In recent years, due to the appearance of color titanium, its use has been expanded to architectural decoration, daily decoration and stationery and so on. Because of this titanium, not only those features mentioned above, but also add decorative effects and artistic value.
1, color titanium color principle
Color titanium surface has a layer of titanium oxide as the principal component of the oxide film. This transparent film, the light has a considerable refractive index, can strongly reflection and refraction of light. In general, the surface of titanium has a thin oxide film, about 5 to 70 angstroms, because it is watery, does not interfere with the light effect, so usually the surface of titanium and will not be colorful, only silver gray. However, if the proper treatment of titanium, titanium surface will add a few hundred angstroms thick oxide film. At this moment, if the light is re-radiated into the film, the light reflected from the film surface will interfere with the light reflected from the surface of the under-film substrate to obtain a beautiful and beautiful interference color. This is the color titanium color principle. Practice has proved that with the oxide film thickness of different, can show yellow, green, gold, pink, black and other different colors, make titanium become brilliant.
2, color titanium coloring technology
From the current situation, the color of titanium coloring techniques is the following 2 kinds.
① Heating oxidation method. The titanium is heated in an oxygen-containing atmosphere and its surface forms a thick film of oxide which gives rise to different shades of yellow to cyan and violent in turn.
Color technology called "atmosphere heating oxidation method", referred to as "heating oxidation method." Its advantage is that the titanium can be colored in a large amount at minimal cost, and the adhesion between the oxide film and the substrate is good. The disadvantages are less color variation, poor uniformity and reproducibility of tone, and difficulty in control. In addition to heating in the oxygen-containing atmosphere coloring, but also in the nitrogen atmosphere heating coloring, known as the "heating nitriding method." At this point, as long as the heating above 750, the soft surface will appear golden yellow titanium nitride film. Advantages of this approach is the case that in addition to the decorative effect, but also can improve the sexual wear resistance, the disadvantage is the color monotonous, only pink gold.
② Titanium anodizing method. Titanium is placed in the electrolyte and authorised to act as an anode. A voltage is applied to the titanium anode and stainless steel or aluminum cathode to form an oxide film on the titanium anode by an electrochemical reaction. People call this coloring technology "titanium anodizing", also known as "electrolytic oxidation coloring." Anodizing the electrolyte used in aqueous, non-aqueous and molten salt solution. Generally, an aqueous solution of phosphoric acid, boric acid and its salt acts as an electrolyte, and a relatively thick oxide film can be formed. When a molten salt aqueous solution and a non-aqueous solution are used as the electrolyte, relatively thin oxide film can be formed. The latter due to greater resistance, electrostatic wear, leakage current is small, is a high-dielectric film used in the electronics industry. Practice has proved that in the anodization process, the electrolyte concentration and temperature, the current density and other effects on the oxide film is not large, but the applied voltage has a great impact on it, the oxide film thickness and applied voltage Is proportional. Compared with the former two kinds of coloring technology, titanium anodizing method has the advantages of rich hue, calm control of hue, high strength of oxide film and good corrosion resistance, so it is considered as one of the most promising coloring technologies.
At present, the titanium alloy anodizing method has been widely used in high-rise building decoration, including the decoration of the external walls and curtain walls, roof decoration, etc.; daily necessities, including decorations, including pins, buttons, belt buckles, Landscaping sporting goods, including tennis racket and so on. China is full of titanium resources, through the study of color titanium, we can certainly develop more high value-added titanium products.
