know that for steel reinforcements or steel structures, such as oil platforms, normally cathodic protection is applied.

Cathodic protection (CP) prevents corrosion of a metal surface by making the metal surface the cathode of an electro chemical cell.

It is widely applied and rather succesful method used to protect metal pipeline, pillars, and other infrastructure from corrosion (chemical attack) with or without mechanical stress applied to the system. Cathodic protection systems are most commonly used to protect steel, water/fuel pipelines and storage tanks; steel pier piles, ships, offshore oil platforms and onshore oil well casings.

From a hydrogen diffusion point of view, an improperly performed cathodic solution, leads to the production of molecular hydrogen, wich gets rather easiliy adsorbed on the metal surface. The subsequent absorption, diffusion, causes embrittlement of the metal.

What do glass reinforced epoxy composites add, besides the absence of hydrogen chemical and stress corrosion degradation?