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Circuit Boards—Green Residue Always Means Corrosion--Or Does It?
Based on an original publication by Alpha
The automatic thinking would be that if you see green residue on a circuit board, you’re going to see corrosion underneath. Depending on how serious, corrosion can cause electrical reliability problems.
Commercial water-white rosin is approximately 80% abietic acid and 20% organic acids and doesn’t enable reaction of soldering. When heated, abietic acids combine with the oxide on the copper surface creating copper abietic very similar looking to the corrosive products of copper.
Rosin fluxes have small quantities of organic activating agents that cause rosin copper oxide to react and result in better soldering. The activators do not cause corrosion; however they do combine with the copper oxide and form green copper abietate. Unfortunately, this green residue cannot easily be distinguished from the corrosion products of copper.