Application Of Titanium And Titanium Alloy In Electroplating Industry
Under the conditions of nickel plating, zinc plating, copper plating and various other electroplating conditions, the electroplating bath is made of steel with hard polyvinyl lining and supported by the pillar in the electrolyte. However, at higher temperatures, hard polyethylene cracks due to thermal expansion (the coefficient of thermal expansion of hard polyethylene is 6 times greater than that of steel), and the integrity of the lining is damaged (especially in the welding area). ), the result is that the bath material is corroded and infertile, which contaminates the electrolyte. Even the amount of corrosion products in the electrolyte (mixture of heavy metals) is not significant. This is an example of improving the quality of the coating. The effect of using rubber as a lining is small, because the rubber is quickly aging Cracked. The lining process and the process of applying a thin layer of rubber are difficult because of poor adhesion to some metals. Using all existing chemical rubber column suspension protection and insulation methods, the suspension rod can only be used in the course of 2 to 3 months when the air vinyl paint or the air vinyl tape is used. It is uneconomical to replace and repair the boom with a large amount of labor.
The most widely used electroplating technology can be plated into various metal coatings. As we all know, electroplating has a history of more than 100 years. It is a kind of electrochemical over-kneading, which is the process of depositing the required metal or alloy layer on metal and non-metal substrates by electrolysis. It is an electrochemical processing technology for decoration protection and certain new properties. . In modern times, it has developed from the surface treatment of metals to the possibility of coating metal coatings on non-metallic surfaces (such as plastic surfaces), using electrodeposition methods to treat previously manufactured workpieces, and so on. Electrodeposition has now developed from metal deposition to metal coating and metal composite coating. The meaning of electroplating is also constantly developing and broadening. It is widely used in machinery, instrumentation, electronics, light industry, transportation and anti-corrosion industries, etc., to improve product quality, decorate and beautify product appearance, and enhance The anti-corrosion ability of the product plays an important role in extending the service life of the product. Electroplating relies on the use of various new electrolytes, raising the temperature and increasing the current density to ensure that the production efficiency of the electroplating layer is improved and the process is strengthened. Therefore, it is necessary to make strict requirements for the structural tree materials of the equipment used in the manufacturing electroplating technology. Requirements. In addition to improving technical performance, increasing the service life of various equipment is of great significance. This means that structural materials and lining materials must be used first.
In the electrolytes used in nickel plating, copper plating, cadmium plating, zinc plating, brass plating, and silver plating, titanium is practically not subject to corrosion solutions except for containing boron hydrogen fluoride or vaporized hydrogen acid (hydrofluoric acid). erosion. It is not recommended to use titanium in the medium containing fluoride ions, because the corrosion rate when the current is cut off is 5mm/A, and when the anode system is turned on, it is greater than 30mm/A. In other occasions, use a titanium alloy bath instead of lead. Lined or hard PVC lined steel baths are reasonable, because the process can be stabilized due to the greatly reduced daily maintenance, and the purity of the electrolyte is controlled to improve the quality of the coating.
Although there are many series of materials used to protect equipment, electroplating is an industrial production that produces harmful waste water, waste gas and waste residues, which causes serious pollution to the environment, and the corrosion resistance and durability of electroplating equipment have not been finally solved. Therefore, the technology of electroplating involves a wide range of disciplines, such as physics, chemistry, machinery, electrical engineering, and so on. It also contains a series of technological processes. Therefore, on the one hand, it is necessary to continuously improve the quality of electroplating, and on the other hand, it is necessary to protect the environment for future generations. benefit. This requires engineering and technical personnel engaged in electroplating to continuously improve the level of science and technology, continuously innovate technology, broaden the scope of adopting new technologies, eliminate pollution, reduce labor intensi ty, improve labor productivity, and eliminate corrosion of equipment by electroplating processes. Lead is chemically stable in chromium plating electrolytes and other various electrolytes, but lead has extremely low mechanical strength. Under the condition of repeated use of lead lining, the electroplating tank body corroded severely.
Because titanium alloy has corrosion resistance in the various electrolytes mentioned above, it is possible to reduce the wall thickness of the electrolytic bath by 1/2 or more. Therefore, the cost of a titanium alloy bath and a steel bath with a hard polynitrogen lining are practically the same. For example, the cost of a steel bath with a volume of 1m3 and a hard PVC lining is 4200 yuan, while the cost of a titanium alloy bath with the same volume is 5000-6500 yuan; the cost of a steel bath with lm3 volume and hard PVC lining is 3000 yuan Yuan, while the bath tub made of titanium alloy with the same volume is 3700-5000 yuan. At this time, the service life of the titanium alloy bath has increased by more than 5-6 times. The use of various titanium alloys can successfully solve the problem of selecting materials for manufacturing equipment with high corrosion resistance in most electrolytes.
