Technical Library | 2023-02-13 18:56:42.0
This paper describes the results of an intensive whisker formation study on Pb-free assemblies with different levels of cleanliness. Thirteen types of as-received surface-mount and pin-through-hole components were cleaned and intentionally contaminated with solutions containing chloride, sulfate, bromide, and nitrate. Then the parts were assembled on double-sided boards that were also cleaned or intentionally contaminated with three fluxes having different halide contents. The assemblies were subjected to high-temperature/high-humidity testing (85_C/85% RH). Periodic examination found that contamination triggered whisker formation on both exposed tin and solder fillets. Whisker occurrence and parameters depending on the type and level of contamination are discussed. Cross-sections were used to assess the metallurgical aspects of whisker formation and the microstructural changes occurring during corrosion.
For heat dissipation Conventional methods measure an adhesive's bulk conductivity, in watts/m-°K. However, across a thin bondline, the resistance of the adhesive itself is only a fraction of the total resistance. Interfacial resistance is a signifi
New Equipment | Cleaning Equipment
SMT Ionic Contamination Tester CTM-100 Test Method Static Sensitivity 0.001uS/cm Tank Size(mm) 380 x 300x 50 Weight （Kg） 42 Product description: SMT Ionic Contamination Tester CTM-100, Test Method Static, Sensitivity 0.001uS/cm, Tank Size(mm)
New Equipment | Test Equipment
SMT Ionic Contamination Tester CTM-100 Test Method Static Sensitivity 0.001uS/cm Tank Size(mm) 380 x 300x 50 Weight （Kg） 42 Product description: SMT Ionic Contamination Tester CTM-100, Test Method Static, Sensitivity 0.001uS/cm, Tank Size(mm)
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For over 40 years, Specialty Coating Systems has provided high quality Parylene conformal coating services and expertise to the medical device, electronics, automotive and military/aerospace industries.
SMT Ionic Contamination Tester CTM-100 Test Method Static Sensitivity 0.001uS/cm Tank Size(mm) 380 x 300x 50 Weight 42KG Product description: SMT Ionic Contamination Tester CTM-100, Test Method Static, Sensitivity 0.001uS/cm, Tank Size(mm) 380
Commonly referred to "Cleanliness Testing" as this test method has, for over 40 years, been acknowledged as an important Quality Assurance and Process Control tool in the manufacture of electronic circuit boards, components and assemblies. The Conta
New Equipment | Cleaning Agents
Heavy Duty Degreaser (HDD) GlobalTech® Heavy Duty Degreaser (HDD) is an aqueous cleaner that is more than 90% water based with all ingredients being 100% active. It has been specially formulated to remove all types of grease, oil, grime, and dirt f
Technical Library | 2023-04-17 21:17:59.0
The purpose of this paper is to evaluate and compare the effectiveness and sensitivity of different cleanliness verification tests for post soldered printed circuit board assemblies (PCBAs) to provide an understanding of current industry practice for ionic contamination detection limits. Design/methodology/approach – PCBAs were subjected to different flux residue cleaning dwell times and cleanliness levels were verified with resistivity of solvent extract, critical cleanliness control (C3) test, and ion chromatography analyses to provide results capable of differentiating different sensitivity levels for each test. Findings – This study provides an understanding of current industry practice for ionic contamination detection using verification tests with different detection sensitivity levels. Some of the available cleanliness monitoring systems, particularly at critical areas of circuitry that are prone to product failure and residue entrapment, may have been overlooked. Research limitations/implications – Only Sn/Pb, clean type flux residue was evaluated. Thus, the current study was not an all encompassing project that is representative of other chemistry-based flux residues. Practical implications – The paper provides a reference that can be used to determine the most suitable and effective verification test for the detection of ionic contamination on PCBAs. Originality/value – Flux residue-related problems have long existed in the industry. The findings presented in this paper give a basic understanding to PCBA manufacturers when they are trying to choose the most suitable and effective verification test for the detection of ionic contamination on their products. Hence, the negative impact of flux residue on the respective product's long-term reliability and performance can be minimized and monitored effectively.
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IONOX® FCR is a solvent blend designed for removing rosin, low solids and water soluble fluxes while being environmentally friendly. Easy to use, FCR is applied as received. A water rinse is required to remove all traces of soils and cleaner residues
