Cleaning No-Clean Fluxes Prior to Conformal Coating
Published: |
March 9, 2020 |
Author: |
ACI Technologies, Inc. |
Abstract: |
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.... |
|
More articles from ACI Technologies, Inc. »
- Dec 07, 2020 - A Non-destructive Approach to Identify Intermittent Failure Locations on Printed Circuit Cards (PCC) that have been Temperature Cycle Tested
- Nov 09, 2020 - Ball Grid Array (BGA) Voiding Affecting Functionality
- Sep 02, 2020 - Reworking ALD Coatings
- Aug 05, 2020 - ALD of Alumina Ceramic Films for Hermetic Protection
- Jul 01, 2020 - Lead-Free Risk Mitigation -- A Case Study
- See all SMT / PCB technical articles from ACI Technologies, Inc.
»
More SMT / PCB assembly technical articles »
- Apr 19, 2022 - Scalable Reliability for Consumer Electronics | HZO, Inc.
- Apr 19, 2022 - Protective Coatings for Non-Invasive Medical Devices for Real-World Reliability | HZO, Inc.
- Apr 19, 2022 - How to Resolve Smart Meter Reliability Issues with Parylene Conformal Coating | HZO, Inc.
- Apr 11, 2022 - iNEMI Webinar 07.07.2021 - PCB Cleaning | ZESTRON Americas
- Jan 28, 2022 - Open Radio Unit White Box 5G | Whizz Systems
- Browse Technical Library »
Cleaning No-Clean Fluxes Prior to Conformal Coating article has been viewed 587 times