PCB News - The important role and application of flux

The important role and application of flux
Paying attention to the trend of environmental protection informatization and the development of various environmental protection technologies,PCB factories can start with big data to monitor the company's pollution discharge and governance results, and find and solve environmental pollution problems in a timely manner. Keep up with the production concept of the new era, continuously improve resource utilization, and realize green production. Efforts to enable the PCB factory industry to achieve an efficient, economical and environmentally friendly production model, and actively respond to the country's environmental protection policy.
Flux is one of the most important components of solder paste. It determines many important physical and chemical properties of each solder paste. It also plays a decisive role in the perfection of solder joints and the reliability of soldering. The flux in the solder paste is the same as the flux used in wave soldering, and should follow MIL-F-14256 and other relevant technical specifications. In the wave soldering process, the flux is sprayed or foamed through the flux tank to coat all the pads on the PCB in a concentrated manner, which is easy to ensure the uniformity of the coating. In the reflow soldering process, the flux is applied to each pad dispersedly by printing, so it is difficult to ensure the uniformity of the coating. The first thing that users care about most is the activity of the flux. In order to make the solder paste have good adaptability to the soldering of various PCB boards and component leads, the flux should have a moderate activity.

Most solder pastes use RMA type neutral flux, this type of flux has a certain degree of activity and non-corrosive. When welding some devices such as PLCC, SOJ or BGA, since the flux residue on the lead (or pad) of these components is extremely difficult to clean after welding, it is safer to use RMA type flux, especially in high-density assembly occasions. Be applicable. When soldering in a nitrogen atmosphere, a flux with lower activity can be used. Only when the solderability of the PCB board and component leads is poor, a strong active flux has to be selected. Out of the need for environmental protection, many manufacturers are sparing no effort to introduce no-clean solder paste, even low-residue solder paste. Regardless of the type of flux, it should make the solder paste have good solderability, widen the operating temperature range of the soldering process, and have strong adaptability to various soldering methods. iPCB is happy to be your business partner. Our business goal is to become the most professional prototyping PCB manufacturer in the world. With more than ten years of experience in this field, we are committed to meeting the needs of customers from different industries in terms of quality, delivery, cost-effectiveness and any other demanding requirements. As one of the most experienced PCB manufacturers and SMT assemblers in China, we are proud to be your best business partner and good friend in all aspects of your PCB needs. We strive to make your research and development work easy and worry-free.
quality assurance
iPCB has passed ISO9001:2008, ISO14001, UL, CQC and other quality management system certifications, produces standardized and qualified PCB products, masters complex process technology, and uses professional equipment such as AOI and Flying Probe to control production and X-ray inspection machines. Finally, we will use double FQC inspection of appearance to ensure shipment under IPC II standard or IPC III standard.