Galvanic corrosion

A reinforcement fibre produced by carbonising a precursor, most commonly polyacrylonitrile (PAN) or pitch, to give continuous filaments composed largely of carbon. It offers very high stiffness and strength for its weight and is the principal reinforcement in high performance composites. Grades are commonly described by modulus class, such as standard, intermediate and high modulus.

An electrolytic process that thickens and controls the natural oxide film on aluminium and certain other metals, improving corrosion and wear resistance and allowing the surface to be coloured by dyeing before sealing. It is widely specified for architectural aluminium and for aerospace components.

A block of a more electrochemically active metal, commonly a zinc, aluminium or magnesium alloy, electrically connected to a structure so that it corrodes preferentially and protects the structure. Anodes are consumed in service and are inspected and replaced as part of planned maintenance.