Actuator for opening and closing a door or a tailgate of a car

An actuator for opening and closing a door or a tailgate of a car, comprising

• a helical compression spring, for opening the door or the tailgate of the car when compressive forces of the helical compression spring are released;
• and
• a motor, for compressing the helical compression spring in order to close the door or the tailgate of the car,
• wherein the helical compression spring comprises a helically coiled coated steel wire,
• wherein the helically coiled coated steel wire comprises a steel core, a metallic coating layer, and an intermetallic coating layer provided between the steel core and the metallic coating layer,
• wherein the intermetallic coating layer comprises an FexAly phase, and
• wherein the intermetallic coating layer provides between 30 and 65% of a combined thickness of the intermetallic coating layer and the metallic coating layer,
• wherein the steel core comprises a steel alloy,
• wherein the steel alloy comprises
• between 0.8 and 0.95 wt % carbon,
• between 0.2 and 0.9 wt % manganese,
• between 0.1 and 1.4 wt % silicon,
• optionally one or more than one of micro-alloying elements selected from the group consisting of chromium, vanadium, tungsten, molybdenum, niobium, and boron;
• optionally aluminum,
• unavoidable impurities,
• and iron,
• wherein the steel core has a drawn lamellar pearlite microstructure, and
• wherein the metallic coating layer comprises aluminum and at least 84% by mass of zinc.