What are the advantages and disadvantages of lead-free solder paste and leaded solder paste?

Everyone should be quite familiar with lead-free and leaded solder paste. Generally, lead-free solder paste is slightly more expensive, which makes people immediately assume that lead-free solder paste is definitely better than leaded solder paste. Such a judgment cannot be made. Generally, it should be defined based on the product and the customer's requirements. Both products have their own differences. Determine which solder paste to use based on the process requirements. Different solder pastes have different functions. The most suitable one is the best. Now, JJY solder Paste Manufacturer will explain the advantages and disadvantages of the two to everyone

Comparison of the advantages and disadvantages between lead-free solder paste and leaded solder paste:

1. Lead-free solder paste

1Environmental friendliness

One of the major advantages of lead-free solder paste is its environmental friendliness. Due to the significant harm it poses to human health and the environment, the use of lead-free solder paste has long been strictly prohibited in Western countries such as Europe and America. If the customer is from abroad, they usually require lead-free solder paste, but lead-free solder paste is more expensive than leaded solder paste.

2Low-temperature resistance

We know that the reflow soldering temperature of lead-free solder paste is generally higher than that of lead-containing solder paste, but the truth is that lead-free solder paste is divided into high-temperature, medium-temperature and low-temperature lead-free solder paste. Among them, there are mainly two types of low-temperature lead-free solder pastes1And is tin 毖2For tin 毖 silver; The former138Melting point, the latter183The melting point: Low-temperature lead-free solder paste can be used for some components that are not resistant to conventional temperature requirements, but the solder joints of this low-temperature lead-free solder without silver will be relatively brittle.

3It has strong activation ability

Compared with leaded solder paste, lead-free solder paste has stronger activation, but its wettability is not as good as that of leaded solder paste. As long as the temperature curve of lead-free solder paste is adjusted properly during reflow soldering, and the data provided by the lead-free solder paste manufacturer and supplier is used as a reference, after experiments, and the process parameters are adjusted properly, a very good soldering effect can be achieved. Lead-free solder paste pairSMTThe technical requirements for surface mount technology (SMT) factories are relatively high.

2. Leaded solder paste

1Low cost

One of the major advantages of lead-based solder paste is its low cost. Therefore, many domestic enterprises still choose lead-based solder paste. However, the low cost also brings high pollution.

2The printing effect is good

(1Leaded solder paste printing has good rolling and tin dropping properties, and is suitable for low to0.4mmThe pitch pads can also achieve exquisite printing.

(2When leaded solder paste is continuously printed, its viscosity changes very little, and the operational life of the steel mesh is long, exceeding12It will not dry out even after hours and still maintain a good printing effect

(3The leaded solder paste remains in its original shape for several hours after printing, with almost no sagting phenomenon, and the surface mount components are not so prone to deviation.

3Reflow soldering has a good effect

(1Leaded solder paste has excellent soldering performance and can exhibit appropriate wettability in different parts.

(2Leaded solder paste can meet the requirements of different grades of soldering equipment. Soldering does not need to be completed in a nitrogen-filled environment and still shows good soldering performance within a wide reflow oven temperature range,Use heating up---Both the heat preservation type and the gradual heating type can be used for setting the furnace temperature.

(3Solder joints with lead solder paste are brighter

4Less residue

Lead-containing solder paste leaves very little residue after soldering, has a very light color and a relatively large insulation resistance, and will not corrodePCBIt can meet the requirement of being washable.

For more information about wingsLead-free solder pasteFor relevant information on leaded solder paste, please feel free to contact our sales staff!