An anti-corrosive coating for structural steel components contains 3 to 80 wt. % of a binder including polymeric material, and 20 to 97 wt. % of a filler including semiconductive elements or compounds. A process for welding a steel component coated with such an anti-corrosive coating involves temporarily energizing the semiconductive material of the coating into its conductive state and then carrying out the welding process, e.g. electric spot welding, while the semiconductive material is in the conductive state. Thereby, the coating does not hamper the electric welding operation. The step of energizing the semiconductive material is achieved by temporarily applying an external energy such as localized heating or incident light radiation having a photon energy corresponding to an energy band gap of the semiconductive material.