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Dielectric nonwovens from Technical Fibre Products (TPF) can be used to prevent galvanic corrosion, a common and destructive problem when aluminium or other metals come into contact with carbon fibre in a composite structure.
TFP explain that the nonwoven can prevent this by providing an extremely uniform, lightweight barrier between the two materials to isolate them, stopping an electrochemical reaction occurring. It says that galvanic corrosion, also known as dissimilar metal corrosion, can occur when two dissimilar conductive materials come into contact, in the presence of an electrolyte (such as water) and a pathway for electron transfer is created. In a composite context, this could mean contact between carbon composite and aluminium components or between a carbon reinforcement and aluminium honeycomb.
Carbon fibre is a good electrical conductor and can produce a large galvanic potential with aluminium, and TFP explains that the result of this is surface corrosion and extensive pitting, which can be very serious, particularly in instances where it occurs out of sight, as undetected, it may cause structural failure. The issue of galvanic corrosion is not limited to aluminium and can occur with other metals and alloys, such as steel or stainless steel, in certain environmental conditions.
TFP claims that this can be achieved by using one of its dielectric nonwovens which acts as an electrically isolating layer, providing a barrier to galvanic corrosion by preventing the electrochemical reaction.
Photo provided by TFP.
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