Flux is an auxiliary material for welding, and it is an important guarantee for the quality of welding products. Although this additive is very easy to use and has a wide range of applications, it still has a certain degree of harm to personnel during use. Therefore, when using solder paste, you must first understand the hazards of solder paste, and then Take targeted protective measures to minimize the harm of solder paste to people.
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　　 Types of solder paste
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1. Press welding masterbatch
Can be divided into stainless steel solder paste, aluminum copper solder paste and so on.
2. According to material composition
(1) Inorganic series flux. Inorganic series fluxes have strong chemical action and very good soldering performance, but they have a large corrosion effect and are acidic fluxes. Because it dissolves in water, it is also known as water-soluble flux. It includes inorganic acids and inorganic salts.
(2) Organic series flux (OA)
The flux effect of organic series flux is between inorganic series flux and resin series flux. It is also an acidic and water-soluble flux. The water-soluble flux containing organic acid is based on lactic acid and citric acid. Because its welding residue can be retained on the soldered object for a period of time without serious corrosion, it can be used in the assembly of electronic equipment, but it is generally not used in SMT solder paste, because it does not have the viscosity of rosin flux (to prevent the movement of chip components).
(3) Resin series flux
Resin flux is the most used in soldering of electronic products. Because it can only be dissolved in organic solvents, it is also called organic solvent flux, and its main component is rosin. Rosin is inactive in the solid state and only active in the liquid state. Its melting point is 127 ° C and the activity can last up to 315 ° C. The optimal temperature for soldering is 240 ~ 250 ℃, so it is within the active temperature range of rosin, and its welding residues do not have corrosion problems. These characteristics make rosin a non-corrosive flux and widely used in electronic equipment. Welding.
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　　 The harm of solder paste
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Solder paste is a chemically synthesized product, which is still harmful to the human body. 300ppm vapor can irritate the eyes, and liquid splashing to the eyes can also cause irritation. Ingestion of solder paste will cause sore throat, nausea, diarrhea, vomiting may inhale the lungs and cause severe lung irritation, damage lung tissue and death chronically, will dissolve skin oil, long-term exposure may cause dermatitis main symptoms: irritation , Nausea, vomiting, headache, etc. The inhalation toxicity of solder paste is extremely harmful to human body. It mainly inhibits the central nervous system of human brain, which will cause dizziness and nausea. If the concentration of solder paste is high, it may cause loss of consciousness. Direct contact with human skin may cause mild skin irritation. Rinse with clean water.
When using solder paste, you must strictly follow the solder paste operation method to reduce the harm to the human body. It is best to reduce the frequency of manual contact with these chemical products. Wet cleaning method can be used to wash hands when solder paste is on hands.
The above is the relevant knowledge content about the types of solder paste and its hazards. Through the above content, I believe that everyone has a better understanding of the hazards of solder paste. In actual work, we must protect ourselves to avoid greater harm to the solder paste.
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