Hydrogen is widely regarded as a promising alternative to fossil fuels. However, establishing a reliable supply chain is essential for its large-scale utilization. Since many components in hydrogen infrastructure are constructed from steel, improving their resistance to hydrogen embrittlement (HE) is critical. A promising approach to reach this goal involves forming surface barriers that hinder hydrogen uptake. The latter can be achieved by employing methods such as laser oxidation and the application of organic coatings. In this work, the role of LO and OC in HE of two martensitic steels has been elucidated. Slow Strain Rate Tensile Tests (SSRT) were performed on hydrogen-charged specimens to evaluate mechanical behaviour. Hydrogen diffusion and uptake were analyzed using Electrochemical Permeation Tests combined with Thermal Desorption Spectroscopy (TDS). Surface layers were characterized by X-ray Photoelectron Spectroscopy (XPS) and Scanning Electron Microscopy (SEM), while Electrochemical Impedance Spectroscopy (EIS) assessed the integrity of coatings after hydrogen exposure. LO facilitated the formation of adherent oxides. Results demonstrated improved mechanical performance of both the oxidized and coated specimens compared to the untreated condition. The OC underwent delamination when exposed to a hydrogen environment, particularly at high temperatures in the presence of electrolyte.
