I have a Novolac phenolic resin (Phenol Formaldehyde) where a copper contact is present. This Phenol Formaldehyde is formed into a cup shape and closed into a switch with copper terminal inside. This switch is activated for 30 min ON-OFF. After which there is a copper corrosion takes place ( a green salt layer forms on the surface of the copper terminal). I have test the cap material, as it is Novolac, this cap material releases ammonia gas and condensing to form Ammonium Hydroxide. As the switch is ON-OFF condition, the temperature raises to 90°C. After 30mins, there is a salt formation on the copper contact surface.
Can any one suggest, what kind of salt this could be?
S. Sheeba Thavamani
Thank you for your input, is it Copper Hydroxide with tetraamine?. Is there any chemical equation?
How can we reduced or avoid this Cu(NH3)4](OH)2 formation and will the moisture will cause the formation of this compund?
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