The appearance of titanium screw is like steel, with silvery white luster. It is a transition metal. Pure titanium screw has high strength, low density, high hardness, high melting point and strong corrosion resistance; Because of its stable chemical properties, good resistance to high temperature, low temperature, strong acid, strong alkali, high strength and low density.
But sometimes, we find many colorful titanium screws on high-end bicycles or cars. All of these have undergone certain surface treatment, and the surface is so bright and colorful. Today, WorldCom Screws will briefly introduce the surface treatment of titanium screws:
1, Removal of reaction layer on the surface of titanium screw
Due to the low density of titanium screws, the flow inertia of titanium liquid is small and the flow performance is poor. During the production process, it is easy to cause defects such as pores on the surface and inside of titanium screws. To make titanium screws bright and colorful, it is necessary to remove the surface reaction layer of titanium screws. There are two ways to remove the reaction layer on the surface of titanium screw:
① Sand blasting: sand particles are impacted on the surface of titanium screw by sand blasting, resulting in fierce sparks, temperature rise and reaction with the surface of titanium screw, forming secondary pollution and affecting the surface quality. The time is 15~30 seconds, and only the sand adhering to the casting surface, the surface sintered layer and part of the oxide layer can be removed. The remaining surface reaction layer structure should be removed quickly by chemical pickling.
② Pickling: The method of cleaning and pickling can quickly and effectively remove the surface reaction layer of titanium screws without causing pollution of other metal elements,
2, Treatment of casting defects of titanium screws
As we have just said, titanium screws may produce internal pores and internal defects of shrinkage holes in the production process: at this time, it can be removed by the isostatic pressing technology.
3, Grinding and polishing
① Titanium screws have high chemical reactivity, low thermal conductivity, high viscosity, low mechanical grinding ratio, and are easy to react with abrasive tools. Ordinary abrasives are not suitable for the grinding and polishing of titanium screws. Super-hard abrasives with good thermal conductivity are used, such as diamond, cubic boron nitride, etc,
②. Chemical polishing: chemical polishing is to achieve the purpose of leveling and polishing through the oxidation-reduction reaction of metal in the chemical medium. Its advantages are that chemical polishing has nothing to do with the hardness of metal, polishing area and structural shape. All parts in contact with the polishing fluid are polished without special complex equipment. It is easy to operate and is more suitable for polishing precision titanium screws with complex structures. However, chemical polishing is difficult to control in the process parameters, so it is required to have a good polishing effect on titanium screws without affecting the precision of titanium screws.
4, Coloring
In order to increase the beauty of titanium screws, make the surface of titanium screws more colorful and bright, and prevent the continuous oxidation of titanium screws under natural conditions. Generally, screw manufacturers will use surface nitriding, atmospheric oxidation and anodic oxidation to color the surface to form a light yellow or golden color on the surface and improve the beauty of titanium screws. The anodic oxidation method uses the interference effect of titanium oxide film on light to produce natural color, which can form colorful color on the titanium surface by changing the cell voltage.
Of course, titanium screw customization is mainly based on different surface treatment methods according to different needs of users. The actual application environment of titanium screws is the main reason for the surface treatment of titanium screws. The above are just the treatment methods of conventional titanium screw fasteners.
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