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Method for producing an Anti-corrosion coating for hardenable sheet steels and an Anti-corrosion coating for hardenable sheet steels

Inactive Publication Date: 2017-11-09
VOESTALPINE STAHL GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The invention describes a coating and layer structure that prevents corrosion on steel surfaces. Unlike traditional coatings, the invention uses a layer of nickel that does not act as a barrier to prevent corrosion. Instead, the nickel reacts with zinc and iron to form a new phase that has a higher melting point. This prevents the formation of molten phases that could interact with the steel surface during the hot-forming and quench-hardening processes. The resulting layer structure is similar to that of pure hot-dip galvanized layers, but with a higher percentage of zinc-containing phases that improve corrosion protection.

Problems solved by technology

It is known that particularly with the press-hardening method, problems can occur such that at high temperatures, molten zinc experiences interactions with the austenite in the steel material that are not yet fully understood, but that result in the formation of cracks in the regions that have undergone intense shaping.
Furthermore, known coatings have a poor paint adhesion due to oxidation of the surface.

Method used

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  • Method for producing an Anti-corrosion coating for hardenable sheet steels and an Anti-corrosion coating for hardenable sheet steels
  • Method for producing an Anti-corrosion coating for hardenable sheet steels and an Anti-corrosion coating for hardenable sheet steels
  • Method for producing an Anti-corrosion coating for hardenable sheet steels and an Anti-corrosion coating for hardenable sheet steels

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Embodiment Construction

[0042]The method according to the invention for producing sheet steel components can either be a press-hardening method or a form-hardening method, i.e. a method in which a sheet steel component is heated and then quench-hardened in a tool (form-hardening) or a method in which a blank is shaped and quench-hardened in a single step (press-hardening).

[0043]According to the invention, a boron-manganese steel is used as the steel material for the press-hardening or form-hardening and with regard to the transformation of the austenite into other phases, the transformation can be shifted to lower ranges and martensite is formed.

[0044]In particular the alloying elements boron, manganese, carbon, and optionally chromium and molybdenum are present in steels of this kind as transformation delayers, i.e. as an element that shifts the phase transformation of austenite into martensite to lower temperatures.

[0045]Steels with the following general alloy composition are suitable for the invention (...

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Abstract

The invention relates to a method for producing an anti-corrosion coating for hardenable sheet steels, wherein at least two metal layers are deposited one after another onto the steel substrate; the one metal layer is a zinc layer or zinc-based layer and the other layer is a layer composed of a metal that forms baser intermetallic phases with Zn or Fe and has a higher oxidation potential than Zn, namely Ni, Cu, Co, Mn, or Mo, or a layer based on these metals; and an anti-corrosion coating for hardenable sheet steels.

Description

FIELD OF THE INVENTION[0001]The invention relates to a method for producing an anti-corrosion coating for hardenable sheet steels and to an anti-corrosion coating for hardenable sheet steels.BACKGROUND OF THE INVENTION[0002]There are currently two common methods for hardening sheet steels and for producing hardened sheet steel components out of sheet steel, in particular vehicle body components.[0003]The two methods share the fact that a steel band is produced from a steel material by means of hot rolling, usually also followed by cold rolling and the steel band is then continuously galvanized. The usual galvanizing method in this case is hot-dip galvanizing in which the steel band is conveyed through a vat of molten zinc; the molten zinc adheres to the steel, the galvanized steel band is usually conveyed vertically from the vat after which the excess zinc is stripped by means of stripping jets, and then the band undergoes a heat treatment as needed. The resulting galvanized steel b...

Claims

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Application Information

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IPC IPC(8): C23C2/06C21D9/48C21D8/02C21D8/04C23C28/02C23C2/28
CPCC23C2/06C23C2/28C21D9/48C21D8/0478C21D8/0278C23C28/025C23C2/26C25D5/10C25D5/50C21D1/673C23C28/42C25D5/625C23C2/026
Inventor KOLNBERGER, SIEGFRIEDCOMMENDA, ERNST
Owner VOESTALPINE STAHL GMBH
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