Method of producing a steel component provided with a metallic coating giving protection against corrosion

A method of producing a steel component with a metallic coating which gives protection against corrosion, comprising:

• a) providing a flat steel product produced from a steel material containing 0.3-3 wt. % manganese, which steel material has a yield point of 150-1100 MPa and a tensile strength of 300-1200 MPa,
• b) coating the flat steel product with an anti-corrosion coating which comprises a ZnNi alloy coating comprising a single γ-ZnNi phase which is electrolytically deposited on the flat steel product and which contains, as well as zinc and unavoidable impurities, 7-15 wt. % nickel, wherein the electrolytic deposition comprises immersing the flat steel product in an electrolyte and passing an electric current through the electrolyte, a speed of the flow of the electrolyte relative to the flat steel product is 0.1-6 m/s, a Ni:Zn ratio of the electrolyte is 0.4-4, electric current is passed at a current density of 10-140 A/dm2, a temperature of the electrolyte is 30-70° C., and a pH of the electrolyte is 1-3.5,
• c) forming the steel component from a blank formed from the flat steel product in a forming die,
• d) heating the steel component to a component temperature of at least 800° C.,
• e) hardening the steel component by cooling from a temperature at which the steel component is in a state suitable for the formation of tempered or hardened microstructure, at a cooling rate which is sufficient for the formation of the tempered or hardened microstructure.

A method of producing a steel component with a metallic coating which gives protection against corrosion, comprising:

• a) providing a flat steel product comprising:
• a steel material comprising 0.3-3 wt. % manganese and having a yield point of 150-1100 MPa and a tensile strength of 300-1200 MPa;
• and
• an anti-corrosion coating comprising a ZnNi alloy coating having a single γ-ZnNi phase electrolytically deposited on the steel product and comprising, as well as zinc and unavoidable impurities, 7-15 wt. % nickel, wherein the deposition of the ZnNi alloy coating was performed by immersing the flat steel product in an electrolyte and passing an electric current through the electrolyte, a speed of the flow of the electrolyte relative to the flat steel product is 0.1-6 m/s, a Ni:Zn ratio of the electrolyte is 0.4-4, electric current is passed at a current density of 10-140 A/dm2, a temperature of the electrolyte is 30-70° C., and a pH of the electrolyte is 1-3.5,
• b) heating a blank formed from the flat steel product to a blank temperature of at least 800° C.,
• c) forming the steel component from the blank in a forming die, and
• d) hardening the steel component by cooling from a temperature at which the steel component is in a state suitable for the formation of tempered or hardened microstructure, at a cooling rate which is sufficient for the formation of the tempered or hardened microstructure.

A method of producing a steel component with a metallic coating which gives protection against corrosion, comprising:

• a) providing a flat steel product comprising:
• a steel material comprising 0.3-3 wt. % manganese and having a yield point of 150-1100 MPa and a tensile strength of 300-1200 MPa;
• and
• an anti-corrosion coating comprising a ZnNi alloy coating having a single γ-ZnNi phase electrolytically deposited on the steel product and comprising, as well as zinc and unavoidable impurities, 7-15 wt. % nickel, wherein the deposition of the ZnNi alloy coating was performed by immersing the flat steel product in an electrolyte and passing an electric current through the electrolyte, a speed of the flow of the electrolyte relative to the flat steel product is 0.1-6 m/s, a Ni:Zn ratio of the electrolyte is 0.4-4, electric current is passed at a current density of 10-140 A/dm2, a temperature of the electrolyte is 30-70° C., and a pH of the electrolyte is 1-3.5,
• b) forming the steel component from a blank formed from the flat steel product in a forming die,
• c) heating the steel component to a component temperature of at least 800° C., and
• d) hardening the steel component by cooling from a temperature at which the steel component is in a state suitable for the formation of tempered or hardened microstructure, at a cooling rate which is sufficient for the formation of the tempered or hardened microstructure.