Titanium is an anti-corrosion metal. At room temperature, titanium can lie unharmed in a variety of strong acid and alkali solutions, even the most ferocious acid-aqua regia (aqua regia: concentrated nitric acid and concentrated hydrochloric acid in a three-to-one ratio It can dissolve gold), and it cannot corrode it, so people use titanium to make submarines. Therefore, the rust spots on the product after titanium plating are not the rust on the titanium film, but the rust spots on the substrate of the product itself.
On the product before titanium plating, if there are oxides (or sand holes or pores) on the product itself, then the point of the oxide (or sand holes or pores) after titanium plating is called the weak point. The substrate itself is not strong enough. After a period of time, the titanium layer at that point of the substrate oxide is easy to fall off, so rust and the titanium coating layer fall off. Generally, when sanding products are polished, the friction coefficient generated is large, and the surface of the product is easy to produce oxides. The reason why the titanium-plated knife produces rust spots is that under the vacuum condition of the titanium plating process, the sand holes and pores of the product substrate are cleaned up, and the surface of the product has sand holes and pores that form a concave shape. However, it is impossible to completely fill the sand holes and pores after titanium plating. After the tool is used, the water remaining in the sand holes and pores has not been cleaned, so that the sand holes and pores are easily oxidized and cause rust spots. The kitchen knives we usually use at home do not see rust when they are used every day, and when they are not used for a period of time, they will rust when exposed to the air. In fact, the oxides produced by the knife used every day and the knife left for a period of time are almost the same. The reason why the rust spots cannot be seen on the knife used every day is because of the oxide produced during the cutting and scrubbing process of the knife we use every day. Part of it has been cleaned. Oxides cannot be deposited, so no rust spots can be seen.
How can a strong titanium film be plated?
Vacuum titanium plating refers to the use of arc discharge in a vacuum environment. The cathode titanium target is used as the evaporation source. The arc discharge between the titanium target and the anode body causes the titanium target to evaporate and form ions, and the generated ions are high-speed It moves on the product and deposits on the surface of the product to form a titanium film. In a high-vacuum and high-temperature titanium plating environment, different colors can be plated by adding different gases. If N2 is added, the color will be golden; if C2H2 is added, the color will be black; if O2 is added, the color will be colored and blue; if N2 and C2H2 are added, the color will be rose gold. In the titanium plating process, the materials used are titanium and high-purity gas, both of which are green and environmentally friendly materials. Since they are produced in a high-temperature vacuum environment and will not produce any harmful substances, the plated products are very safe and environmentally friendly. Can pass various safety tests.
If you want to plate a solid titanium layer, you must first have good equipment. Because in the coating process, the vacuum system must work stably, and the furnace body must maintain a good pressure. If impurities are mixed in during the coating process, the color will be unsatisfactory, and the titanium will be removed in serious cases. Good equipment has high arc source ionization rate, high ion density formed, few large particles, high smoothness of the plated film, low friction coefficient, firmness and no shedding, poor equipment, low ionization rate, and the plated film Rough and dull, easy to scratch and fall off.
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