Methods for Minimizing or Eliminating Wastewater from Flux Slurries in Non-Corrosive Flux Brazing

Effect of NOCOLOK® flux dry-off temperature on mechanical properties of brazed joint for automotive aluminum-based heat exchangers

“…To achieve a uniform flux particle distribution in the slurry and the particles remain suspended for a long time, figure 9 shows the PSA analysis of the powder with a size distribution within 0.1-10 μm (1 μm on average) meaning slurry with uniform suspension can be made. This size distribution is also suggested for suspended slurries elsewhere [16,17]. The other advantage of the fine powder is a full surface coating with high adhesion strength and efficiency for better heat transfer to the surface joint.…”

“…This reaction accelerates the evaporation and consumption of KAlF 4 and the reaction product is HF. HF gas tends to escape from the system causing the reaction to continuously consumes more KAlF 4 [16].…”

“…As mentioned earlier, the NOCOLOK ® flux has been widely used in brazing aluminum heat exchangers on which the particle size of the powder for two different types of spraying, wet and electrostatic applications, have been studied [16,17]. In order to omit the Al-4343 clad layer, a reactive element like silicon added into the NOCOLOK ® powder made an aluminum-silicon eutectic structure during brazing.…”