Abstract: An expansion anchor includes an anchor bolt, an expansion sleeve as a first element where the expansion sleeve surrounds the anchor bolt, a wedge body for expanding the expansion sleeve as a second element where the wedge body is disposed on the anchor bolt, and a double coating disposed on one of the first and second elements at least in an area of contact with the other of the first and second elements. The one of the first and second elements on which the double coating is disposed is carbon steel. The double coating has a zinc flake and/or an aluminum flake top layer and a hot dip galvanized zinc, a ZnNi, or a ZnFe base layer that is covered by the zinc flake and/or the aluminum flake top layer.

Abstract: A steel comprising 0.07 to 0.14 wt. % of carbon, 13 to 15 wt. % of chromium, 1.3 to 1.7 wt. % of molybdenum, 1.5 to 2.0 wt. % of nickel and 1.0 to 1.5 wt. % of manganese and use of the steel for producing screws is provided.

Abstract: The invention relates to a method for depositing chromium and/or chromium alloys on metals, and particularly on sheet steel, wherein an alloy layer is electrolytically deposited on the metal from a solution containing chromium ions and/or chromium ions and further metal ions such as Zn, Cd, In, Pb, Bi, Mo, Cu, Fe, Ni, Co, Mn, Al, Sb, Ag, Sn, Mg, wherein chromium hydroxide precipitated from a chromium (III) solution is used for regenerating the electrolyte solution using chromium (III) ions.

Abstract: The invention relates to a corrosion-protective layer for protecting steel substrates from corrosion, comprising a zinc-chromium layer applied on the steel substrate by electrolytic joint deposition of zinc and chromium ions, and a chromate-free organic thin layer applied thereon, substantially comprising synthetic resins, and to a method for improving the paint adhesion of a zinc-chromium corrosion-protective layer.