Steel product with an anticorrosive coating of aluminium alloy and method for the production thereof
An anti-corrosion protection, aluminum alloy technology, applied in the field of steel products to reduce the formation of slag
Active Publication Date: 2017-08-01
THYSSENKRUPP STEEL EURO AG +1
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Problems solved by technology
[0005] But coatings of AlSi alloys have only modest corrosion protection even if they are not hot-formed
Method used
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[0042] The invention is then further illustrated with the aid of examples.
[0043] Coating of steel products, typically flat steel products The aluminum coating according to the invention is carried out by briefly immersing the steel product in a coating bath, and can therefore also be referred to here as hot-dip aluminizing. A pretreatment for activating the steel surface is carried out in order to achieve good wetting and adhesion of the coating material on the steel substrate. The pretreatment and hot-dip aluminizing are preferably carried out successively and preferably in a continuous process sequence. The process sequence includes the following steps:
[0044] a) supply of steel products, in particular flat steel products, in the hot-rolled or cold-rolled condition,
[0045] b) Purify the surface of the steel product (optional)
[0046] c) Surface activation of steel products
[0047] d) hot-dip aluminizing, ie hot-dip coating in an aluminum-based coating bath compo...
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The invention relates to a steel product, in particular a flat steel product, with a metallic anticorrosive coating of aluminium alloy and also to a method for producing such a steel product. In order that such a steel product has a great media resistance, in particular a great resistance to acid and corrosion, the steel product is immersed in a molten coating bath containing an aluminium alloy which, apart from Al and unavoidable impurities, according to the invention comprises the following elements: Mn 0.2 - 2% by weight and / or Mg 0.2 - 7% by weight, Fe 0.5 - 5% by weight as an obligatory element, Ti 0.05 - 0.4% by weight and / or Zr 0.05 - 0.4% by weight. The method according to the invention is characterized by the following steps: providing a steel product, in particular a flat steel product, in a hot-rolled or cold-rolled state, activating the surface of the steel product so as to remove passive oxides from the surface of the steel product, and coating the surface-activated steel product by immersion in a molten coating bath containing an aluminium alloy of the composition specified above.
Description
technical field [0001] The invention relates to a steel product, in particular a flat steel product, which has a metallic corrosion protection layer consisting of an aluminum alloy and to a method for producing such a steel product. Background technique [0002] In this context, a steel product is understood to mean a flat steel product whose width and length are each a multiple of the thickness. The flat steel product is, for example, a steel strip or a steel slab. [0003] The corrosion resistance of aluminum is basically formed by the aluminum-based Al 2 o 3 The influence of the overlay and the stability of the overlay. The corrosion of aluminum only occurs in strong acid medium or alkaline solution. Therefore, the range of use of aluminum alloys is generally limited to a pH range of 5-8. The only exceptions are concentrated oxygen acids such as nitric acid, acetic acid and phosphoric acid. In addition, aluminum in NH 3 Good to very good stability in solution. [...
Claims
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IPC IPC(8): C23C2/12C23C2/34C23C2/26C22C21/00
CPCC22C21/00C23C2/12C23C2/26C23C2/34C09D1/00C09D5/08C22C21/02C22C21/06C23C2/0222C23C2/004C23C2/024C23C2/0224C23C2/022C23C2/522Y10T428/12757C23C28/321C23C28/345C25D11/16
Inventor 马克·布卢梅瑙奥利弗·莫尔米夏埃尔·彼得斯蒂埃莫·武特克
Owner THYSSENKRUPP STEEL EURO AG