The thermal degradation of electroplated black chrome coating on Ni substrates has been investigated by using Auger electron spectroscopy technique. The sample was prepared by electroplating at $20^{circ}C$ for 20 seconds with the current density at $0.4A/cm^2$. Its surface oxidation process was investigated with 1 hour annealed sample for a temperature range of $300-550^{circ}C$. While its optical solar absorption was dominated by fine metallic Cr particles, thermal degradation was occurred primarily by oxidation of metallic Cr particles as increasing the annealing temperature.