Galvanized square tube is widely used in building steel structure, automotive manufacturing, mechanical manufacturing, bridge structure due to excellent corrosion resistance, deep processing molding, paint, and weldability, and good surface quality and comprehensive mechanical properties. , Container keel, ship manufacturing and other fields.
Galvanizing square tube tube processing is the principle of electrolytic, and a metal or alloy layer is deposited on the surface of the product through the electrolytic process of metal ions to change the physical and chemical properties of the product surface. In the end In addition, it can be painted according to the special requirements of specific products, and it can be coated with a certain specific coating, such as light energy and electromagnetic coating, etc., so that it can fully expand the application field of galvanized square tube tube.
The production specifications of galvanized tube tubes are: square tube: 20 × 20 × 1.3 ～ 500 × 500 × 16mm; rectangular tube: 20 × 30 × 1.3 ～ 400 × 600 × 16mm.
Galvanized torque pipe processing electroplating process mainly has the process of pre -processing, plating and post -plating treatment. The quality of the plating layer depends on the electroplating process of the material, and the electroplating process is affected by many factors. The six major factors are summarized as follows:
1. Zinc content: the higher the purity of zinc block, the narrower the bright range of its light, the easier to obtain the coating of the car board, and the iron content in the coating will be lower; when the purity of the zinc block is too low, its bright range will be It takes a longer time to reach the specified zinc layer thickness, which will lead to higher iron content in the galvanized layer.
2. Sodium hydroxide: Sodium hydroxide has a dual effect on the reaction. When its content is too high, scorching is prone to occur during high temperature operations; and when its content is too low, the solution has a poor dispersion ability, which will reduce the zinc layer. the quality of.
3. Iron content: When the iron content is too high, the iron in the plating layer will be corresponding, which will cause the product passivation film to be insufficient and bright; while the iron content is too low, it will lead to low iron content in the galvanized layer, reducing the car board to the car board Cortency resistance will cause the surface of the car plate to be olive.
4. Eliments: Now use more glitter consisting of ZF-100A and ZF-100B mixes. The concentration of the former is too high will enhance the brittleness of the plating layer. Both phenomenon.
5. Temperature: Too high temperature during electroplating will cause the decentralized solution to decrease, the iron content in the plating layer rises, and the passivation is uneven; when the reaction temperature is too low, the high -current density area will be easily burnt, the plating is crispy and sedimentary Slow speed.
6. Cathode movement speed: During the electroplating process, the cathode must be in a state of movement. If the movement speed is too fast, the plating of the high current density zone in the electroplating process will be rough; and the movement speed is too slow. Essence
The galvanized rectangular tube is used as electroplating metal. The electrode is used to electrize Zn2+in the solution, and then the surface of the galvanized square torque pipe is deposited to form a uniform and dense zinc metal layer. Compared with other metals, zinc belongs to a gender metal, which is easy to dissolve in acid and can be soluble in alkali. It is easier to electrize metal ions in the solution. During the processing of galvanized tone tube, pay attention to the above aspects to produce high -quality qualified galvanized square tube tube products.
