What are the ingredients of SMT-specific solder paste? JJY Solder Paste Manufacturer

smtFor special useSolder pasteWhat ingredients are there? As an experienced hand in this industry, I have come into contact with some applications and knowledge in this area. Generally, in the electronic life process, tough people often ask whether solder paste has a corrosive effect on the soldering iron tip. If so, then what is its corrosion mechanism? Is it toxic to the human body? What type of solder paste is the best to use? Which brand is the best? Now, JJY solder Paste Manufacturer can have a chat with everyone:

Solder paste is used for soldering,First, the protective gas prevents oxidation by air. In addition, it enhances capillary action, improves lubricity, and avoids empty welding, Solder paste:White crystalline powder. Content99.0 ％, Acid value0.5 mgKOH/g, mp 112℃Soluble in alcohol, Equal protection. It is widely used in organic chemistry, Pharmaceutical intermediates, It serves as a surfactant in the production and manufacturing of flux and solder paste, Regulator resistance, Strong vitality, It has certain effects on the bright spots and the smoothness of welding and electric welding. It is the best surface-active additive among all fluxes, It is widely used as a high and medium-grade energy-saving flux in the precision processing of electronic components.

The composition and function of alloy powder:

Solder powder alloy is the main component of solder paste, accounting for approximately of the total mass of the solder paste85%~90%. The commonly used alloy combinations are as follows: tin-lead alloySn-PbTin, lead and silverSn-Pb-AgAlloy, tin-copper alloySn-CuTin-silver-copper alloySn-Ag-CuTin-bismuth alloySn-BiTin-bismuth-silver alloySn-Bi-AgEtc.

The composition, ratio, particle size and surface oxidation degree of alloy powder have the greatest impact on solder paste.

When the alloy content is relatively high, it can improve the slump of solder paste, which is conducive to forming full and bright solder joints. At the same time, since the content of flux decreases with the increase of alloy content, the residue after soldering will also decrease, effectively preventing the appearance of solder beads. However, the disadvantage is that the requirements for printing and soldering processes are relatively strict.

When the alloy content is relatively low, the printing performance will improve. The solder paste is less likely to stick to the squeegee, has good wettability, a longer service life of the solder mask, and is easier to process. However, the disadvantages are that it is prone to collapse and defects such as solder beads or bridging are likely to occur.

The components of solder paste can be classified as2The major part is flux and solder powder.

The specific components of flux include active agents, thixotropic agents, epoxy resins, and organic solvents. 

Solder powder, also known as tin powder, is mainly composed of tin-lead alloy, with a general proportion of63/37; When there are special requirements, a certain amount of tin powder containing metallic materials such as silver and bismuth is also added to the tin-lead alloy. 

It seems that lead is more harmful here. You can give your child foods rich in vitamins, such as jujubes, black jujubes and seaweed and other seafood products. Vegetables, some leafy vegetables and carrots can also help eliminate lead. In addition, the protein in milk and soy milk can combine with lead to form insoluble substances, and the calcium they contain can prevent the digestion and absorption of lead.

The solder paste of Shenzhen JJY brand has gone through many years12A solder paste and wire manufacturer specializing in the annual research and development of solder paste, solder wire, solder wire, lead-free solder paste, leaded solder paste, solder rods, leaded solder paste, etc. Choose the solder paste of JJY brandSolder paste manufacturer.