Technical Library | 2019-05-23 10:42:00.0
Why identify flux residues? The primary purpose of flux is to reduce species of metal oxides from solderable surfaces, and to act as a mechanism for lifting and removing debris. If the assembly is not properly cleaned after manufacturing, flux may continue to reduce metals and may eventually corrode the assembly. When the assembly is powered, the metal ions may precipitate along electromagnetic field lines and form dendritic shorts. In addition, the presence of residue can alter the insulation properties of a board, affect the adhesion of the conformal coating, or interfere with the moving parts of the assembly. In radio frequency (RF) applications, flux may change the RF properties on the surface of the printed circuit board (PCB) such as the dielectric strength, surface resistance, and Q-resonance.
Technical Library | 2020-03-09 10:50:17.0
A customer called the Helpline seeking advice for cleaning no-clean fluxes prior to applying a conformal coating. The customer's assemblies were manufactured with a no-clean rosin based solder paste (ROL0) and were cleaned with an isopropyl alcohol (IPA) wash. After cleaning, a white residue was sometimes found in areas with high paste concentrations and was interfering with the adhesion of the conformal coating (Figure 1). For conformal coatings to adhere properly, the printed circuit board (PCB) surface must be clean of fluxes and other residues. In addition, ionic contamination left by flux residues can lead to corrosion and dendrite growth, two common causes of electronic opens and shorts. Other residues can lead to unwanted impedance and physical interference with moving parts.
New Equipment | Cleaning Equipment
Fully automatic PCBA cleaning machine-SMS-5600 1. Comprehensive cleaning, which can thoroughly clean the residual rosin flux, water-soluble flux, no-clean flux, solder paste and other organic and inorganic pollutants on the surface of PCB after sol
Technical Library | 2019-06-03 15:32:40.0
ACI Technologies was pleased to assist a customer by conducting elemental analysis on several assemblies displaying severe corrosion. Several board assemblies had failed in the field and exhibited areas of corrosion in close proximity to onboard components. The most common source of corrosion on electronic assemblies is residual flux. Fluxes are specific chemistries applied during the soldering process which improve the wetting of the solder to both the pad and component when forming the solder joint. They can be highly reactive chemicals that, if left on the assemblies, can lead to corrosion, electrical degradation, and decreased reliability. In the presence of moisture and electrical bias, flux residue can enable dendritic growth as a result of electrochemical migration (ECM).
Parts & Supplies | Pick and Place/Feeders
The definition of SMT SMT is the surface assembly technology,surface mount technology(surface mount technology)(Surface Mounted Technology abbreviation),is currently the most popular electronic assembly industry,a technology and technology. What a
New Equipment | Soldering - Other
High specification, bench top rotary table soldering machine A versatile four station rotary bench top soldering machine, ideally suited for high or low volume production, the Quadron combines well proven pumped soldering techniques with advanced PL
New Equipment | Soldering - Other
High specification, bench top rotary table soldering machine A versatile four station rotary bench top soldering machine, ideally suited for high or low volume production, the Quadron combines well proven pumped soldering techniques with advanced PL
New Equipment | Board Handling - Conveyors
Soldering PCB Rework Conveyor 1. Modular design 2. Weighted design improves stability 3. Smooth and parallel width adjustment (screw) 4. PCB detection mode 5. Customizable equipment length 6. Adjustable transport speed 7. SMEMA 8. Motor drive 9. Hig
New Equipment | Board Handling - Conveyors
Soldering PCB Rework Conveyor 1. Modular design 2. Weighted design improves stability 3. Smooth and parallel width adjustment (screw) 4. PCB detection mode 5. Customizable equipment length 6. Adjustable transport speed 7. SMEMA 8. Motor drive 9. Hig
New Equipment | Cleaning Equipment
In-line technologies in a batch footprint. Today’s challenges for PCB manufacturers hinge on high density, increasing complexity, and miniaturization. Manufacturers who currently clean with batch-type cleaners are looking for a solution
