SVIBOR - Project code: 2-15-039

MINISTRY OF SCIENCE AND TECHNOLOGY

Strossmayerov trg 4, HR - 10000 ZAGREB
tel.: +385 1 459 44 44, fax: +385 1 459 44 69
E-mail: ured@znanost.hr

SVIBOR

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Project code: 2-15-039


EKO-ECO RATIONALIZATION IN PRINTED CIRCUIT BOARDS TECHNOLOGY DEVELOPMENT


Main researcher: LIPNJAK, GORANA (25946)


Assistants
Type of research: applied
Duration from: 01/01/91. to 12/31/94.
Papers on project (total): 76
Institution name: Ericsson - Nikola Tesla, Institut, Zagreb (71)
Department/Institute: CHEMICAL TECHNOLOGY DEPARTMENT
Address: KRAPINSKA 45
City: 10000 - Zagreb, Croatia
Communication
Phone: 385 (0)1 353-535 (4206)
Phone: 385 (0)1 354-206
Fax: 385 (0)1 328-540
Summary: The project refers to the improvement and rationalization of particular segments of the technological process of manufacture of precise printed circuit boards with plated-through holes, the aims of which are quality improvement, material and energy cuts and acceptance of ecological requirements. The researches deal with the application of pulse current in electrolytic metal deposition processes, usage of water soluble soldering fluxes and resists as well as precise polarography and cyclic voltammetry analytic methods, with the application of modern quality assurance methods based on the international ISO 9000 standards.

Keywords: Through hole printed circuit boards, pulse electroplating, fluxes for soft soldering, ecology, resist, polarography, cyclic voltammetry, quality assurance, surface maunt tehnology

Research goals: The aim of the project is reduction of costs, application of ecological materials in the production of PCBs and quality improvement. The obtained research results enable the usage of water-dilutable solder masks and photoresists, as well as the application of ecologically suitable fluxes in soft soldering process. New copper and gold electrodeposition methods, like pulse current metal deposition, and optimal deposition parameters reduce the using up of metals and improve the quality of metal coating. Careful study of new analytic methods and the application of FMEA analysis (Failure Mode and Effect Analysis) yield better PCB quality. Protective coating on soldering surfaces of printed boards for surface mounting and the efficiency of imidazole derivates as inhibitors of atmospheric corrosion of copper on printed boards were tested. Good results were also obtained at determining ionic contamination of printed boards and SMT assemblies. A direct metallizing process of printed boards was developed which offers large economic and ecological advantages.

COOPERATION - INSTITUTIONS


  1. Name of institution: Institut "Jožef Štefan"
    Type of institution: State institute
    City: Ljubljana, Slovenija
Other information about the project.
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Last update: 10/17/95
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