Cause analysis of PCB yellowing after lead free reflow soldering
Author:Zhou Baoguo Time:2021-06-06 16:50 Browse(740)
Cause analysis of PCB yellowing after lead free reflow soldering, touch screen and OLED Forum
_ 5 ^; ? 0 a9 O. D3 ?& J! V2 K    v. E( p. @( q     The yellowing of PCB after lead-free reflow soldering may be caused by the problem of solder paste. Due to the different quality of solder paste, it is possible to use inferior solder paste to cause PCB board yellowing during over reflow soldering. Therefore, Zhichi suggests that you must recognize the brand when you buy solder paste, and you can't buy inferior solder paste for low price.

Cause analysis of PCB yellowing after lead free reflow soldering

this paper analyzes the reasons for the problem1 p$ O( A3 M* D7 a3 m2 |7 _' \3 c/ f* z) G1 P.
`$ b! Z       During lead-free reflow soldering, the PCB turns yellow. It is also possible that the temperature of lead-free reflow soldering furnace is too high and not at the optimal temperature. We can reset the temperature, It is recommended to refer to the lead-free reflow soldering curve provided by the solder paste manufacturer.
generally, the temperature of the first stage of reflow soldering (preheating zone) is too high.
if the solder paste is OK.
the reflow soldering furnace temperature is set correctly, Another reason is the problem of PCB material and printing ink.
if it's a PCB problem, you need to find a PCB supplier to solve it.
if it's a PCB problem, you need to find a PCB supplier to solve it- O: X! P( F5 U.
y) z# w5 j8 K) o# ~9 A. l/ i3 ?       There are three reasons for PCB yellowing after lead-free reflow soldering. If you encounter such a situation, you can check the reflow soldering according to the above three points. The most common reason for PCB yellowing after lead-free reflow soldering is that the temperature of lead-free reflow soldering is too high- k( j( n3 {9 s5 i: z6 L* ^) J6 o6 g6 E( o: C6 ~# t" Q.
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