Date of Publication

5-1997

Document Type

Master's Thesis

Degree Name

Master of Engineering major in Chemical Engineering

Subject Categories

Chemical Engineering

College

Gokongwei College of Engineering

Department/Unit

Chemical Engineering

Thesis Adviser

Yolanda P. Brondial

Defense Panel Chair

Susan A. Roces

Defense Panel Member

Noel Cabigon
Lilia I. Silao

Abstract/Summary

Staining of leadframes is one of the problems encountered in the Solder plate process (Tin-Lead Plating Process). It occurs when the spray rinse water and neutralizer solutions are acidic. Experiments on the determination of dragout rate of Solderon acid in the plating cell and the effect of dragout of Solderon acid in the pH of spray rinse water and neutralizer were conducted. Dragout is a liquid that is carried along by the material being plated as it transferred from one cell to another. The water from the spray rinse sump tank is originally a re-circulating process and the water supply comes from the used water of hot de-ionized rinse. With this set up, it was found out that the dragout of Solderon acid in the plating cell made the spray rinse water and neutralizer solutions acidic which led to the staining of the leadframes.Re-piping was then proposed to eliminate or minimize staining problems. Experiments on the effect of re-piping on the pH of the spray rinse and neutralizer were also conducted. Data shows that after re-piping, the spray rinse water and neutralizer had maintained their basic levels. As such, re-piping as a means of eliminating or minimizing the staining problem in the leadframes is effective.

Abstract Format

html

Note

A Practicum Report

Language

English

Format

Electronic

Accession Number

TG02638

Shelf Location

Archives, The Learning Commons, 12F Henry Sy Sr. Hall

Physical Description

vii, 39 leaves

Keywords

Solder and soldering; Acids; Lead plating; Semiconductor industry; Tanks

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