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Pickling method for profiles, rolled strips, and sheets made of aluminium alloys

A technology of aluminum alloy and aluminum alloy products, applied in the direction of metal material coating process, coating, surface reaction electrolytic coating, etc., to improve corrosion resistance, small loss, phosphatability and adhesive adhesion. Sexual improvement effect

Active Publication Date: 2020-07-24
HYDRO ALUMINIUM ROLLED PROD GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Early identification of rejects leads to savings

Method used

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  • Pickling method for profiles, rolled strips, and sheets made of aluminium alloys
  • Pickling method for profiles, rolled strips, and sheets made of aluminium alloys
  • Pickling method for profiles, rolled strips, and sheets made of aluminium alloys

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Embodiment Construction

[0058] figure 1 The aluminum alloy strip shown has a high magnesium content and corresponds to a composition according to AA5182. The defect already described here is shown at the edge in the form of irregular, wavy gray-brown streaks. The strip was first etched alkaline (0.5% NaOH, 1.5% degreaser composition consisting of nonionic and anionic surfactants and complexing agents; contact time 45 seconds) and then acid etched (2% HNO 3 +300ppm F - ; contact time 11 seconds). figure 2 The strips shown in are made with figure 1 The strips in the same batch are manufactured. figure 2 strips were additionally subjected to an acidic pre-cleaning according to the invention (2% HNO 3 +300ppm F - ; contact time 11 seconds). Defects were not visually recognizable on this tape.

[0059] In laboratory tests, aluminum alloy strips were compared which, on the one hand, were treated according to the three-step corrosion method according to the invention (samples CV2, CV3, CV5), and w...

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Abstract

The invention relates to a method for cleaning an aluminium alloy product which has not been machined, said method comprising an alkaline degreasing by pickling and an acidic aftertreatment of the aluminium alloy product pickled in alkaline conditions. In said method: (a) the aluminium alloy product is subjected to an acidic pre-cleaning prior to the alkaline degreasing by pickling; or (b) the aluminium alloy product is subjected to an alkaline degreasing by pickling, a subsequent acidic rinsing, a renewed alkaline treatment and a subsequent further acidic rinsing, wherein the aluminium alloyproduct can be a rolled aluminium alloy strip, a rolled aluminium alloy sheet or aluminium alloy profile.

Description

technical field [0001] The present invention relates to a method for obtaining a uniform surface appearance A cleaning method for an aluminum alloy product with excellent corrosion resistance, and an aluminum alloy product manufactured by the method according to the present invention. Background technique [0002] In the production of aluminum alloy strips from aluminum alloy ingots, rolling oils or rolling emulsions are used in particular in the rolling step, which are introduced into the aluminum alloy strip together with other particles due to the rolling step in the surface. After rolling or between individual rolling passes, heat treatment, preferably annealing, ie for example intermediate or final annealing, can also be carried out in order to bring the aluminum alloy strip into a specific microstructure or to adjust desired mechanical property values. Annealing the aluminum alloy strip results in a concentration of alloying constituents, such as zinc, silicon, copp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/16C23C22/78C23G1/12C23G1/22
CPCC25D11/04C25D11/16C23G1/00C23G1/125C23G1/22
Inventor 卡特林·埃克哈德奥拉夫·居斯根奥利弗·鲍尔
Owner HYDRO ALUMINIUM ROLLED PROD GMBH
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