What are the reasons that affect the gloss of reflow solder joints in smt processing?

insmtDuring processing, many customers usually have requirements for the glossiness of reflow solder joints. The quality of solder joints directly affects the service life and reliability of electronic products. However, during the reflow soldering process, it cannot be guaranteed that the glossiness of each reflow solder joint meets the requirements. So, what are the reasons for the insufficient glossiness of reflow solder joints?Now, Shenzhen JJY Solder Paste Manufacturer will take you to learn about it:

The main factors affecting the glossiness of reflow solder joints

1The composition of solder paste is different, which will affect the gloss of the solder joints. For example, the solder joints presented are different when the solder paste contains silver and when it does not.

2Whether the tin powder in the solder paste is oxidized or not will cause differences in the gloss of the solder joints.

3Whether there are any additives in the flux itself in the solder paste that form a matting effect;

4During the reflow soldering process, if the reflow soldering temperature is insufficient or too high, causing the flux to evaporate prematurely, it will directly affect the gloss of the solder joint.

5In reflow soldering, the preheating temperature of reflow soldering is relatively low, and there may be substances that are difficult to evaporate remaining on the surface of the solder pad, which will affect the gloss of the reflow solder joint

6After reflow soldering, whether there is rosin or other impurities remaining on the surface of the solder joint is a common phenomenon, which will affect the gloss of the solder joint.

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