Thyssenkrupp Rasselstein Gmbh

Benjamin Liebscher

Reiner Sauer

Helmut Oberhoffer

Anika Szesni

Tanja Lommel

Andreas Tschage

Winfried Hoehn

Beate Bannemann

Kathleen Stein-fechner

Petra Diederich

Karl-Ernst Friedrich

A method of removing a coating made of an organic material, in particular an organic lacquer or a polymer coating, which adheres to the surface of tin-plated sheet steel. In a first step, the tin layer of the tin-plated sheet steel is completely or incipiently melted by exposure to electromagnetic radiation with a predefined wavelength, to which the organic coating is at least primarily transparent, with the organic coating becoming detached from tin layer, and in a second step, the organic material of the coating which detached from the tin layer is removed.

Method of removing a coating of organic material adhering to the surface of tin-plated sheet steel

The invention relates to a method for enhancing a metallic coating on a steel strip or steel plate, the coating being melted by heating to a temperature above the melting temperature of the material of the coating, the heating taking place by irradiation of the surface of the coating with electromagnetic radiation having a high power density over a limited irradiation time of not more than 10 &#x3bc;s, and the mandated irradiation time and the energy density introduced into the coating by the electromagnetic radiation being selected such that the coating melts completely over its entire thickness down to the boundary layer with the steel strip, thereby forming a thin alloy layer at the boundary layer between the coating and the steel strip. The invention further relates to a steel strip or steel plate having a metallic coating, more particularly a coating of tin, zinc or nickel, in which, at the boundary layer between the steel and the coating, an alloy layer which is thin&#x2014;compared with the thickness of the coating&#x2014;and at the same time is dense, and is composed of iron atoms and atoms of the coating material, is formed, the thickness of the alloy layer corresponding to an alloy-layer add-on of less than 0.3 g/m.

Method for enhancing corrosion resistance of a metallic coating on a steel strip or plate

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Benjamin Liebscher