Different solder paste can be used together?
Article Source: Huizhou Electroloy Technology Co., Ltd.Popularity:5625issuing time:2017-12-30 17:07:14【SML】
Lead solder paste and lead-free solder paste can be used with it?
Here
we start with the composition of solder paste products, solder paste is
divided into lead solder paste and lead-free solder paste. As the name implies, lead solder paste is the solder paste containing lead (Pb). Lead-free solder paste, also known as environmentally-friendly solder paste, is in need of RoHS-compliant solder paste. Because
the RoHS standard to make a clear lead, the lead content of its
products can not exceed 1000PPM, it will be called a lead-free solder
paste. When
it comes to it, it is obvious that there is a lead-free solder paste
that can not be mixed with a lead-free solder paste because the
lead-free solder paste meets RoHS standards. Mixed with the consequences of the product can be exported will also be unqualified.
Then there is the same solder paste can be mixed with it?
Here, we need to refine the metal composition of solder paste. We know that the lead solder paste metal composition is generally tin (Sn), lead, silver (Ag) composition. In general, tin-lead solder paste back more, and occasionally add some silver. The
purpose of silver is to increase the electrical conductivity, silver
and silver if there is not mixed with lead solder paste, silver solder
paste will dilute the proportion of the resulting product performance is
not expected to do well. Because mixed solder paste change the proportion of solder paste
composition, resulting in less than expected product effect, so
different lead solder paste can not mix with.
So is the same lead-free solder paste, can be mixed with it?
Here
we give an example, high-temperature lead-free solder paste is tin
silver copper composition, low temperature solder paste in order to
reduce the melting point, joined the bismuth (Bi) this metal, its
composition is tin bismuth two. If they are mixed, the melting point will inevitably change so that the desired melting point can not be achieved. So
that it can not melt in the expected temperature, and
bismuth-containing solder paste solder paste is also more brittle, the
welding effect decreased. So in the usual use of solder paste is best not to mix.
