Plating process of hardware terminal

The stamped terminals are only raw materials and must be electroplated before they can be used on the connector. To improve efficiency, high-speed selective continuous electroplating is often used. Here is an introduction to the electroplating process and production process of the hardware terminal: 1. The purpose of electroplating: In order to prevent oxidation of materials, reduce contact resistance, increase solderability, and increase wear resistance, it directly affects the electrical conduction of the circuit and the life of the connector. 2. The understanding of electroplating is that in the connector manufacturing, the contact The most widely used method of coating on shrapnel is electroplating where the metal ions in the electroplating solution are deposited to the cathode, and the metal ions can come from the soluble anode in the electroplating solution to supplement the metal ions deposited on the cathode. In this simple unit, the deposition and electroplating process is mainly controlled by the chemical action of the solution and the current distribution on the cathode surface. The plating material, such as gold, is deposited on different points of the underlying base metal and gradually thickens on the surface of the plating during the electroplating process. When a certain thickness is reached, the plating layer'completely' covers the surface of the underlying metal. That is, the degree of coating coverage is determined by the surface characteristics and cleanliness of the base metal and the electroplating process. The most common disadvantage of the electroplating process is that there are many pores in the coating. This kind of pores with many pores is called porosity. 3. Electroplating principle Electroplating is a method of surface treatment. It uses electrode reaction to form a coating on the surface of the workpiece. The material (workpiece) with a conductive surface is used as the cathode, and the dissolved metal (Ni, Sn/Pb, etc.) is used as the anode. In the electrolyte solution, under the action of external direct current, the anode metal is dissolved into metal ions and precipitated on the cathode (workpiece), thereby forming a plating layer firmly bonded to the workpiece. 4. The terminal plating layer material is generally nickel (Ni). ) The bottom layer, and then selectively plating tin/lead (Sn/Pb), gold (Au) or palladium (Pd) and other metals as needed. The plating layer is very thin, and the general unit is mile (u'). 1 u'u003d 1 Micro inch u003d 10-6 × 25.4 mm u003d 1/400 × 0.01mm u003d 1/400 1u u003d 39.4 u'5. Introduction to the continuous electroplating process Into the warming belt of the electroplating machine. b. Chemical degreasing: Cathodic electrolytic degreasing method is adopted for the purpose of degreasing. c. Electrolytic degreasing: the cathode electrolytic degreasing method is used for the purpose of degreasing. d. The purpose of washing with water is to wash away the alkaline degreasing liquid sticking to the material belt, so as not to bring it into the next station and neutralize excessive acid. e. Acid activation: the purpose is to remove the surface oxide (CuO) of the material and neutralize the alkali that is too degreasing. f. Secondary water washing: wash away the sulfuric acid on the surface of the material. g. Ni plating: The purpose is to make a base for protection. Ni plating must be covered with Au and Sn/Pb immediately, otherwise it is easy to be oxidized and the guide wheel cannot spark, otherwise it is easy to peel off and produce pinholes. h. Recycling water washing: the purpose is to clean and recover the Ni taken out. i. Washing with water: the purpose is to prevent Ni from being brought into the next station. j. Sn/Pb plating: purpose to improve terminal solderability. k. Post-processing: including hot water washing → blunt water washing → drying → drying, the purpose is to remove the chemical solution attached to the surface of the terminal, so that the terminal is in a dry environment, and the terminal is prevented from corrosion and discoloration. l. Receiving materials: confirm the quantity and quality, and paste the label. n. The development of the warehousing society is inseparable from the wide application of the electronics industry, the rapid technological update, and the innovation of terminal technology in electronic products. Welcome new and old customers to call or write to us. Dongguan Precision Electronics Co., Ltd. will share with you Achievement, win-win cooperation and common development!