Complex Approach to Protecting Titanium Constructions from Hydrogen Embrittlement

The research is aimed at studying the complex effect of alloying and protective coating on the resistance of titanium to embrittlement in a hydrogen environment.When determining the alloying complex, elements are selected that reduce the rate of interaction of titanium with the hydrogen-containing medium and increase the maximum allowable hydrogen concentrations.The AlN coating applied by helicon-arc ion-plasma sputtering is chosen as the barrier layer.The dynamics of hydrogen accumulation is studied by the Sievers' method in the mode of heating and isothermal exposure at hydrogen pressure of 0.6 MPa and temperature of (700 ± 10)°C.As proved, the proposed protective coating has a high resistance in aggressive hydrogen environments at temperatures up to 700°C, significantly reduces the catalytic ability of the surface, and has an order of magnitude lower permeability to hydrogen.Additional doping with aluminium and molybdenum further reduces the amount of absorbed hydrogen by 30%.