51314-4411-Preventing Corrosion Related Electrical Failures: The Response to RoHS

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Product Number: 51314-4411-SG

ISBN: 4411 2014 CP

Author: David Schaaf

Publication Date: 2014

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ABSTRACTCorrosionCorrosion by definition is the gradual destruction of material usually metals by chemical reaction with its environment. During this reaction metal is dissolved into an electrolyte and oxygen from the atmosphere is reduced in the solution. Also contaminants such as H2S SO2 Cl2 can often accelerate this reaction.In recent years the miniaturization of electronic components and the elimination of lead solder via RoHS have made the corrosion of electronics a matter of increasing concern. Corrosion causes failures in electronics by creating a bridge between the electronic connections thus destroying the electrical component.Corrosion MonitoringBecause of these changes to electronics and the adoption of RoHS there has been a concerted effort to update existing standards and to issue new guidelines.For over 25 years the International Society of Automation (ISA) has been the definitive source for corrosion guidelines with standard 74.01. The current edition of ISA standard 71.04 is from 1985. A revised version is set for release that includes both copper and silver corrosion coupons in response to these recent changes.Within the American Society of Heating Refrigeration and Air Conditioning Engineers similar recommendations have been made to use both copper and silver corrosion coupons in addition to monitoring and maintaining temperature and humidity conditions.