Branch Snyder Department of International Ltd. Shenzhen-Electronic Technology Co., Ltd. - The Department of Electronic Technology Company is a professional custom single-sided, double-sided, 2-40 storey density multilayer professional supplier, Shenzhen circuit board technology, to provide customers with high-precision, high-quality circuit board in Shenzhen, quality assurance, reasonable prices. Pattern plating resist metals - the main purpose of the tin-lead alloy plating copper coating protected the substrate as etching. However, the coating thickness must be strictly controlled to ensure that the etching process can effectively protect the base metal. Check Item hole metallization coating the inner wall is complete, with or without holes, lack of copper and other defects; check if the surface of the exposed copper surface is uniformly thick copper layers, with or without nodules, with or without sand-like and so on; check bath The chemical composition is within the range prescribed in the process; check the plating area calculated values, pcb circuit board technology, coupled with the experience of real production based on the value obtained or% compared to finalize the current value; check the procedure provided technology file, in accordance with the process requirements to determine the plating process parameters. The surface state of the connection reliability and conducting site inspections groove conductive parts, should be in good condition; before plating process analysis and adjustment of the solution that is analyzed single reference; determining racking parts and fixture preparation. Branch Snyder Department of International Ltd. Shenzhen-Electronic Technology Co., Ltd. - The Department of Electronic Technology Company is a professional custom single-sided, double-sided, 2-40 storey density multilayer professional supplier, to provide customers with high-precision high quality Shenzhen board, quality assurance, reasonable prices. Also known as slope, ceramic circuit board technology for the PCB temperature from ambient temperature to be raised to the activation temperature of. In this area, a mobile phone circuit board technology, the heat capacity of the circuit boards and components are different, they actually raise the temperature of the different rates. Temperature circuit boards and components should not exceed 2 ~ 5 ℃ per second speed continuous rise, if excessive, cause thermal shock, circuit boards and components that are likely to damage, such as tiny cracks ceramic capacitors. The temperature rise is too slow, the paste will be excessive temperature, solvent evaporation is insufficient, affecting the quality of welding. Oven preheat zone usually accounts for the entire length of the heating zone of 15 ~ 25% PCB board process | Newell Year | Shenzhen circuit board technology provided by the Department of Shenzhen-Electronic Technology Co., Ltd. Newell Shenzhen Electronic Technology Co., Ltd. (www.yipcb.com) (www.yipcb.com) quality of service and products, continue to receive the recognition and trust of new and old customers and the industry. Our company is a certified member of the whole alliance network operators, business alliance customer service icon on the page, you can talk directly with our customer service staff, to our future cooperation happy!