The aim of this chapter is to summarize the importance of hydrogen as an alternative energy
source and its principal applications and future trends in a new economy. The effect of the
phenomenon of hydrogen embrittlement in metallic materials is mainly described and the
principal factors that enhance the susceptibility of materials are discussed. The most
common degradation mechanisms are explained for a good understanding of the
advantages and disadvantages of the use of hydrogen as an energy of the future and for a …