Ion chromatography in the manufacture of multilayer circuit boards
Ion chromatography (IC) has proven useful in analyzing chemical solutions used in the manufacture of multilayer circuit boards. IC provides results on ions not expected in the production solutions. Thus solution contamination, and breakdown products can be monitored in every phase of the circuit board manufacturing. During the first phase, epoxy laminates experience an etchback, first in chromic acid, which can be analyzed for trace chloride and sulfate, then in ammonium bifluoride/HCl, which can be analyzed for fluoride and chloride. Following a wet blasting to roughen up the surface, 20 ..mu..in. of copper are deposited using an electroless bath. Again, IC is applicable for monitoring formate, tartarate, and sulfate levels. Next, an acid copper bath is used to electroplate the through holes with 0.001 in. of ductile copper. This bath is analyzed for trace chloride. Photoimaging is then performed, and the organic solvents used can be assayed for trace ionic chloride. Finally, a fluoroboric acid-based tin-lead bath is used to deposit a solderable alloy. This bath is analyzed for total fluoroborate, tin, and lead. In addition, mobile phase ion chromatography (MPIC) is used to monitor the nonionic organic brighteners in the baths. 11 refs., 3 figs.
- Research Organization:
- Allied Corp., Kansas City, MO (USA). Bendix Kansas City Div.
- DOE Contract Number:
- AC04-76DP00613
- OSTI ID:
- 5890482
- Report Number(s):
- BDX-613-3798; CONF-8709185-1; ON: DE88002428
- Country of Publication:
- United States
- Language:
- English
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Ion chromatography in the manufacture of multilayer circuit boards
Applications of ion chromatography. [Fluoroboric acid]
Related Subjects
400102* -- Chemical & Spectral Procedures
42 ENGINEERING
420800 -- Engineering-- Electronic Circuits & Devices-- (-1989)
ADDITIVES
AMMONIUM COMPOUNDS
AMMONIUM FLUORIDES
ANIONS
BORON COMPOUNDS
CHARGED PARTICLES
CHEMICAL ANALYSIS
CHLORIDES
CHLORINE COMPOUNDS
CHROMATOGRAPHY
CHROMIC ACID
CHROMIUM COMPOUNDS
COPPER
DEPOSITION
DISPERSIONS
ELECTRODEPOSITION
ELECTROLYSIS
ELEMENTS
EPOXIDES
FLUORIDES
FLUORINE COMPOUNDS
FLUOROBORATES
HALIDES
HALOGEN COMPOUNDS
HYDROGEN COMPOUNDS
IMAGES
INORGANIC ACIDS
ION EXCHANGE CHROMATOGRAPHY
IONS
LAYERS
LEAD
LYSIS
MANUFACTURING
METALS
MIXTURES
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
OXYGEN COMPOUNDS
PROCESS SOLUTIONS
SEPARATION PROCESSES
SOLUTIONS
SURFACE COATING
SURFACE TREATMENTS
SURFACTANTS
TIN
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
USES