Relevant knowledge of copper bar silver plating and tin plating surface treatment
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What is copper bar?What is the role of copper bars?What are the surface treatment methods for copper bars?Is there any introduction to copper bus related knowledgeFirst, let’s understand the overview of copper bars: copper bars are a kind of high-current conductive products, suitable for high and low voltage electrical appliances, switch contacts, power distribution equipment, bus ducts and other electrical engineering. It is also widely used in metal smelting, electrochemical plating, chemical caustic soda, etc. Electric current electrolysis smelting project.We supply electrical copper bars with the advantages of low resistivity, large bendability, etc.. Copper bars are also called copper bus bars, copper bus bars or copper bus bars, grounding copper bars, made of copper, with rectangular or chamfered (rounded) rectangular long conductors in cross section, and called aluminum bars in circuits. Play the role of delivering current and connecting electrical equipment. Because the conductivity of copper is better than that of aluminum, copper bars are widely used in electrical equipment, especially complete sets of power distribution devices; copper bars are used for U, V, W phase bus bars and PE bus bars in general power distribution cabinets; copper When in use, the row is generally marked with a letter of the same color or painted with a color paint. The U-phase copper row is coated with “yellow”, the V-phase copper row is coated with “green”, and the W-phase copper row is coated with “red”. , PE busbar copper bars are coated with “yellow and green” double colors. Introduction of copper bar related knowledge-the effect of tinned copper bar on the conductivity of the copper bar: The surface of the copper bar is tinned, one is to prevent the copper bar from oxidizing, and the other is to improve the contact surface of the copper bar. And because the metal tin and copper bonding layer will be Forms an alloy to enhance the adhesion of the copper plating layer, and the conductivity of metal tin is also good.Good compactness, high smoothness, and enhanced wear resistance of the plated parts. Introduction to copper bar related knowledge-tinning on the surface of copper bar. Uses: (1) Manufacturing tin cans: Because tin plating is non-toxic, it is widely used in objects that come in contact with food and beverages. The largest use is to make tin cans. Others such as kitchen utensils. Food cutlery, oven, etc.. (2) Electrical and electronic industries: Because tin is easy to weld and has good electrical conductivity, it is widely used in electrical and electronic parts that need to be welded. (3) Copper wire: improve the weldability of copper wire and the barrier effect between copper wire and insulation. (4) Reactivity: Because tin is soft, it can prevent scratches and act as a solid lubricant. (5) Prevent nitriding of steel. Introduction of copper bar related knowledge-copper bar surface treatment items: 1.To prevent the external environment from corroding the copper bars, measures are taken: nickel plating, zinc plating, tin enamel, silver plating, painting, protective casing, etc.. 2.To increase insulation performance and prevent contact with live objects, measures are taken: sleeve insulation sleeve (cold/heat shrinkable insulation sleeve), sleeve joint sleeve. 3.Increase conductivity, copper is used to conduct electricity, and the conductivity is: gold, silver, copper, aluminum.Due to the alternating current, most of the current goes to the surface. If the copper body is not plated with gold or silver, it is best not to plate.So why should tin and nickel plating, mainly for anti-corrosion.Therefore, in order to allow the environment to be perpetual, it is best not to plate anything, except for gold and silver.Conductivity becomes worse after plating. 4.Increase heat dissipation performance, the main measure is black paint. Introduction of copper bar related knowledge-copper bar surface treatment method and process: 1.This process of painting copper bars belongs to the elimination of backward processes and is rarely used now..Process: All three-phase AC circuit bus bars are painted with black paint, and color code is pasted on conspicuous places. Phase A is yellow, phase B is green, phase C is red, neutral or neutral line is painted with light blue paint, and grounding wire is used for safety. Alternate yellow and green two-color paint, white paint can not be distinguished between polarity and phase sequence. 2.Advantages of tinning copper bars: mature technology.Short operation cycle, widely used.Disadvantages: the surface becomes dark after a long time, which cannot be done by hand.Not environmentally friendly! Process flow: surface polishing and degreasing and other pre-treatments → pure water washing → high Pb-Sn alloy plating tap water washing → pure water washing → tin plating → tap water spraying → neutralization (Na2HPO4+Na3PO4) → tap water spraying → immersion stearic acid →Tap water spray washing→hot pure water immersion→drying. 3.Advantages of copper bar coating protective agent: maintain the original color of the copper bar, slightly lower than the cost of tinning.Disadvantages: long operation cycle. Process flow: pre-polishing treatment → pure water washing → pickling passivation workpiece → drying moisture → JLR-510 protection treatment → flowing water washing → hot water soaking (about 100 ℃, used for heating the workpiece, the purpose is to let the water volatilize or Drying)→drying→packing closed. Introduction of copper busbar related knowledge-copper bus installation requirements: 1. The assembly of copper busbar must wear gloves to prevent fingerprints and stains on the surface. 3. Fasteners for copper bar connection use galvanized bolts/screws, nuts and washers that meet national standards. 3. The length of the combined screw should be considered to be 2～5mm outside the nut after the screw is tightened, and the length of the hexagonal head bolt/half-round square neck bolt should be considered after the bolt is tightened. Or too short. 4. Bolt penetration direction is generally from bottom to top, from back to front, from left to right, and try to be unified.When the copper bar is placed horizontally, the connecting bolts and nuts should be tightened from bottom to top. In other cases, the nuts should be installed on the side that is convenient for maintenance.. 5. There must be flat washers on both sides of the connecting copper row bolts, and spring washers or lock washers should be added to the nut side..Adjacent bolt washers should have a clear distance of 3mm or more to prevent heating of the magnetic circuit. 6. Under normal circumstances, it is not suitable for three copper bars to be overlapped at one place, according to the requirements of design and process documents.. 7. The contact surface of the copper bar should be tightly connected. The connecting bolts should be tightened with a torque wrench to confirm and mark, and the connecting combination screws should be tightened with a torque batch to confirm and mark. The tightening torque value should meet the requirements of the “Thread Tightening Process Specification”. 8. The copper bar installation should be flat and beautiful, and when the copper bar is installed: horizontal section: the height error of the two supporting points is not more than 3mm, and the total length is not more than 10mm.Vertical section: the vertical error of the two supporting points is not more than 2mm, and the total length is not more than 5mm.Spacing: The spacing of the parallel parts should be uniform, and the error should not be greater than 5mm. 9. When two or more rectangular copper bars are connected in parallel, the thickness gap between the parallel copper bars should not be less than the thickness to facilitate heat dissipation.. Yueqing Renhe Electronics Co., Ltd. is a professional copper bar manufacturer in Zhejiang, focusing on the production, research and development of new energy electric vehicle battery copper bar connection, electrical connection copper bar, braided copper bar, flexible copper bar connection, cable connection and insulating protective cover And sales.Products comply with EU environmental protection, UL flame retardant, ISO9001 management system certification requirements.