Machine vision in detection of corrosion products on SO2 exposed ENIG surface and an in situ analysis of the corrosion factors

K. Kantola, R. Tenno

Research output: Contribution to journalArticleScientificpeer-review

12 Citations (Scopus)

Abstract

Corrosion resistivity is an important property in printed circuit boards manufacturing where the electroless nickel immersion gold (ENIG) is a commonly used surface finish. The corrosion resistivity of the surface is tested with a sulphur dioxide (SO2) test which imitates the influence of atmospheric corrosion. The test result is analyzed manually by vision inspection, which is unsuitable for mass production. The result is also qualitative (failed or passed) and therefore the corrosion severity is impossible to analyze and further mathematical analysis is hard to conduct. In this paper, a new machine vision based corrosion evaluation algorithm is developed for quantitative and objective analyzing of the SO2 test result. The algorithm produces automatically the same data as the manual method and, in addition, also new continuous corrosion state estimates. The produced data are further used for correlation analysis in which the relations between the parameters of the ENIG process and the corrosion resistivity of the surface are studied and the algorithm is verified.

Original languageEnglish
Pages (from-to)2707-2714
Number of pages8
JournalJournal of Materials Processing Technology
Volume209
Issue number5
DOIs
Publication statusPublished - 1 Mar 2009
MoE publication typeA1 Journal article-refereed

Keywords

  • Corrosion detection
  • ENIG-surface finish
  • PCB manufacturing
  • Quality control

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