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The ongoing efforts of expanding hydrogen transport infrastructure have led to growing research into the safety of hydrogen pipelines. The primary risk comes from hydrogen embrittlement (in the case of pure gaseous hydrogen transport) or a combination of both corrosion and embrittlement (in the case of a hydrogen and natural gas mixture). For the purpose of maintaining pipeline integrity, the effectiveness of different commercially available coatings is being researched. This study evaluates the protective properties of five different commercially available two-component epoxy coatings: Belzona 5811, 1381, 1391S and Teknos Inerta 300, and Teknopox 3296. The testing carried out included a surface gloss evaluation, a RAL pigment test, hardness testing using both pencil test and Shore D methods, adhesion testing using the pull-off method and electrochemical testing focusing on electrochemical impedance spectroscopy (EIS). The samples in question were applied by hand on both a carbon steel and AISI 304 stainless steel substrates. The described barrage of tests aims at determining the protective properties of coatings as well as their adhesion to the substrates. Aside from the control samples, a batch of samples on a carbon steel substrate was exposed to a 95% H2-air mix in a static chamber and tested.
hydrogen; hydrogen and methane mixtures; pipelines; organic coatings, corrosion
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