[en] Studies of the surface damage and erosion of chemically vapor deposited (CVD) TiB₂ and C coatings on metallic substrates are reported for irradiation with 5 to 20 keV and 100 keV D⁺ and ⁴He⁺ ions for different doses at room temperature. Furthermore, D⁺ and He⁺ irradiations of commercial grade Ti and ATJ graphite were conducted to study the difference in surface damage and erosion between the TiB₂ coatings and Ti metal, and between the CVD carbon coating and extrusion molded ATJ graphite. SEM analysis of polished TiB₂ and Ti samples after irradiation with D⁺ and ⁴He⁺ ions with energies at 10, 15, 20 and 100 keV to a dose of 3.1 x 10¹⁸ ions/cm² reveal significant surface damage due to blistering. D⁺ irradiation of the as received carbon coatings for energies of 10 to 20 keV to a dose of 3.1 x 10¹⁸ ions/cm² revealed no surface blisters or major surface damage whereas the He⁺ irradiation showed some growth features on the surface. In contrast, 10 to 20 keV D⁺ irradiated ATJ graphite revealed large ridges and grooves on the irradiated surface, and 10 to 20 keV He⁺ irradiated surfaces showed pitting