Flux hazards and related knowledge, the role of flux, the hazards of flux

1: The flux is a liquid water agent product, and the exhaust fan should be turned on during soldering, and the soldering operation should be carried out in a ventilated place.

2: The flux is prepared for mixed materials, and the oxide layer on the surface of the product is cleaned by soldering.

3: There are certain differences in the materials used in each preparation, so the welding effect will also be different.

4: When welding, please store it separately from the edible water cup and food to avoid accidental eating.

5: Store in a cool and ventilated place, away from fire.

6: Try to bring masks when welding.

Flux is a chemical mixture, usually with rosin as the main ingredient, and is an auxiliary material to ensure a smooth soldering process. It plays an important role in the welding process. So what exactly does it do?

First, the role of flux.

The main acting ingredient in flux is rosin, which will be broken down by tin at about 260 degrees Celsius, so the temperature of the tin bath should not be too high Flux is a chemical that promotes soldering. In solder, it is an indispensable auxiliary material, and its role is extremely important.

1) Dissolve the oxide film on the surface of the welded base metal.

In the atmosphere, the surface of the welded base metal is always covered with an oxide film, the thickness of which is about 2 10-9 2 10-8m. During welding, the oxidation of the blind hall film will inevitably prevent the solder from wetting the base metal, and the welding can not be carried out normally, so the flux must be coated on the surface of the base metal to reduce the oxide on the surface of the base metal, so as to achieve the purpose of eliminating the oxide film.

2) Prevent the re-oxidation of the welded base metal.

The base metal needs to be heated during the soldering process, and the metal surface will accelerate oxidation at high temperatures, so the liquid flux covering the surface of the base metal and solder can prevent them from oxidizing.

3) Reduce the surface tension of the molten solder.

The surface of the molten solder has a certain tension, just like rain falling on a lotus leaf, due to the surface tension of the liquid, it will immediately coalesce into bead-shaped water droplets. The surface tension of the molten solder prevents it from diffusing to the surface of the base metal, affecting the normal wetting process. When the flux is applied to the surface of the molten solder, the surface tension of the liquid solder is reduced, and the wetting performance is significantly improved.

4) The function of protecting the surface of the welded base metal has destroyed the original surface protective layer of the welded material during the welding process. A good flux is used after soldering and quickly returns to protecting the soldering material.

Second, the hazards of flux.

There is no flux that is completely harmless to the human body, of course, this harm only exists at the moment when the flux has a chemical reaction during the use of the flux.

There is a chain field flux that is less harmful to the human body, and that is an environmentally friendly flux. The higher the requirements for environmental protection, the less harmful the flux is to the human body. But there is no flux that is completely harmless to humans, because flux itself is a chemical product.

Of course, because the higher the environmental requirements, the higher the cost of flux, the higher the flux**. Therefore, many factories only buy flux that just meets the customer's requirements in order to save costs.

3. Defects and countermeasures of flux residues.

The problems caused by flux residue are corrosive to the substrate, reducing electrical conductivity, causing migration or short circuit, and non-conductive solids such as invading the contact parts of the components will cause poor bonding, excessive resin residue, and adhesion of dust and debris, which will affect the reliability of the product.

Reasons for use and countermeasures: choose a suitable flux, its activator activity is moderate, use flux that can form a protective film after welding, use flux with no resin residue after welding, use low-solid content no-clean flux, and clean after welding.

1. The flux mainly has several functions, such as "auxiliary heat conduction", "removing oxides", "reducing the surface tension of the welded material", "removing the oil stain on the surface of the welded material, increasing the welding area", "preventing re-oxidation" and so on.

2. Flux is a chemical substance that can help and promote the soldering process in the soldering process, and at the same time has a protective effect and prevents oxidation reaction. Fluxes can be classified as solids, liquids, and gases. The flux is usually a mixture with rosin as the main ingredient, which is an auxiliary material to ensure the smooth progress of the soldering process.

1. It has a certain corrosiveness to the substrate;

2. Reduce electrical conductivity, resulting in migration or short circuit;

3. Non-conductive solids such as invading the contact part of the element will cause poor jointing;

4. Excessive resin residue, adhesion of dust and sundries;

5. Affect the reliability of the product.

How can it be so serious, I will show you the authoritative information.

I've been doing this for more than 10 years and haven't found anything wrong.

Inhalation of the gas while exposed may cause symptoms such as difficulty breathing, lightheadedness, weakness, fatigue, nausea, and headache. Pain response may be delayed for several hours.

Constant exposure can cause stinging, cracking, dermatitis.