Environmental protectionLead-free solder pasteWhat are the characteristics of lead-free solder paste for environmental protection? NoneODSChemical substances that are not prone to damaging the atmosphere; There are no halogen bulbs. RightPCBThere is no corrosion after the plate is welded. The surface grounding resistance is high and the electrical performance is good,The weld points are round and bright. Liquid tone:Fully transparent or light yellow, solder paste can be classified in various ways. It can be categorized by temperature, composition, and whether it is environmentally friendly or not. By temperature, it can be divided into high-temperature solder paste, medium-temperature solder paste, and low-temperature solder paste. By composition, they can be classified as: tin-silver-copper, tin-silver-bismuth, tin-bismuth, tin-lead, and tin-lead-silver solder paste. By whether they are environmentally friendly or not, they can be divided into: lead-free solder paste, leaded solder paste, and halogen-free solder paste.

It is often used in manufacturersLEDThe vast majority of special lead-free solder pastes are dark gray or grayish-white pastes, generally500GSealed cans are also specially customized, such as syringe packaging or1KGPackaging, general application3#Powder diameter(25-45μm)The alloy powder and 8% to 12% flux paste are in the vacuum pump(N2Maintenance)The uniform mixing in the natural environment. Below, the double Dominican solder paste manufacturer will explain it to youLEDCharacteristics of special lead-free solder paste: LEDSpecial lead-free solder paste because some materials can only withstand150High temperatures within a certain degree, therefore The composition of the aluminum alloy to be applied isSn42Bi58The low-temperature lead-free solder paste has a melting point of138Degree;LEDMonitors must be exposed to the sun and rain outdoors for a long time RegulationLEDThe solder joints of the monitor computer motherboard have sufficient ductility and must be adoptedSn96.5Ag3.0Cu0.5andSn99Ag0.3Cu0.7High-temperature lead-free solder paste, with its aluminum alloy composition of tin, silver and copper, can reasonably improve the deficiency of "relatively brittle" in low-temperature tin-bismuth lead-free solder paste, making the solder joints firm. whileLEDThere is also an aluminum alloy component in the special lead-free solder pasteSn64/Bi35/Ag1The medium-temperature lead-free solder paste has the characteristic of a melting point close to that of leaded solder paste, making it suitable for surface mount devices of many electronic components. Due to the addition of silver in the solder paste composition The firmness of electric welding makes up for the shortcomings of low-temperature lead-free solder paste and is more suitable for indoor useLEDThe lamp is of surface mount type, and many manufacturers, in order to save costs, apply aluminum alloy with a composition of when users do not have environmental protection regulationsSn63Pb37Leaded solder paste.

Lead-free solder paste

The lead-free solder paste for environmental protection works under the required technical parameters and can achieve excellent soldering results, meeting various requirementspcbThe high-standard regulations for the welding function of circuit boards can be mutually coordinated without the application of heavy metal solders. Environmentally friendly lead-free solder paste has no odor, generates little smoke and contains no harmful substances to the human body. It causes zero pollution to the natural environment. Environmentally friendly and free of heavy metals, the solder paste has good forgeability, with round and bright solder joints and good tin penetration properties. After solderingPCBAThe surface is smooth and even, with good smoothness and little odor.   The ring protection should have excellent lubricity. Under normal circumstances, the duration for which solder remains above the liquid phase line during reflow soldering is 30~90 In seconds, the feet of the welded steel pipe are reached by the wave soldering machinepcbThe duration of contact between the substrate surface of the circuit board and the solder wave soldering is 4 After applying the heavy metal-free solder for about a second, it is necessary to ensure that the solder can exhibit excellent lubrication performance within the above-mentioned time period to guarantee high-quality welding results.  

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