What are the "tin spraying" processes in PCB circuit board processing?

With the continuous development of the electronics industry,PCBThe technical level is also improving accordingly. Common surface treatment processes include tin spraying, gold plating and gold plating.OSPEtc. Among them, tin spraying is divided into lead-free tin spraying and leaded tin spraying. Well,PCBWhat are the "tin spraying" processes in circuit board processing? The following is JJYSolder paste manufacturerLet me explain it to everyone:

PCBSurface treatment tin spraying type:

1. Lead-tin spraying

Leaded tin spraying refers to the process of mixing tin in a certain proportion. Lead can enhance the activity of tin wire during the welding process. Leaded tin wire is relatively better than lead-free tin wire, but lead is toxic and the lead in leaded tin is harmful to the human body;The eutectic temperature with lead is lower than that without lead. The specific amount depends on the composition of the lead-free alloy, likeSNAGCUThe eutectic of is217The welding temperature is the eutectic temperature plus30~50Degree. It depends on the actual adjustment. The lead eutectic is183Degree. Mechanical strength, brightness and other aspects with lead are better than those without lead. So, having lead and tin is not environmentally friendly and is somewhat different from the environmental protection advocated by the world. Therefore, lead-free tin spraying was born.

2. Lead-free tin spraying

Lead-free tin is an environmentally friendly process that poses very little harm to the human body and is also a process advocated at present. The lead content in lead-free tin does not exceed0.5 Lead-free tin has a high melting point, which makes the soldering points much stronger. In essence, leaded tin spraying and lead-free tin spraying are the same process. It's just that the purity of lead is different. Lead-free tin is more environmentally friendly and safer for the human body and the environment, and it is also a future development trend. It is recommended that everyone use it.

The above is an introduction to the differences between the two products for everyone. You can refer to it. If you need to know more about this content, welcome partners to come and consult. Let's learn and grow together with Shenzhen JJY Industrial Technology Co., LTD.!