ICSR (Soldering and Reliability) Conference Proceedings

Application of the Flowers of Sulfur Test to the Turbini Corrosion Coupon

Authors: Bev Christian, Ph.D., Ahmed Eltom and Deepchand Ramjattan
Company: BlackBerry
Date Published: 5/13/2014   Conference: ICSR (Soldering and Reliability)

Abstract: With increasing airborne pollution levels in several parts of the world and decreasing spacing of components in electronic assemblies and lead free soldering, the corrosive effects of the pollutants on modern electronics is becoming more apparent. The standard test for this has been the mixed flowing gas test (MFG). This is an expensive, complicated and rare test. There are probably fewer than 25 of these units in all of North America. A simpler test is the flowers of sulfur test (FoS) which subjects the test coupons to the vapor of pure sulfur. This is a test that can be safely performed with a minimum of equipment. In the present work FoS is applied to the Turbini coupon, an adaptation of the Bono coupon. The effects of the sulfur chemicals on coupons of true bare copper and other coupons coated with OSP subjected to different conditions of temperature and humidity are detailed in this paper. Examination of the coupons is done by cross-sectioning and SEM/EDX.

Key Words: 

Flowers of Sulfur, Mixed Flowing Gas, Copper Corrosion, Bono Test, Corrosion Factor, Surface Finishes

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