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A boron-containing low-carbon steel oxide film layer and preparation method thereof

A technology of oxide film layer and low carbon steel, which is applied in the direction of anodic oxidation, coating, electrolytic inorganic material coating, etc., can solve the problem that magnesium alloy can replace alloy special steel, coating strength, wear resistance and corrosion resistance can not meet the demand , complex process and other issues, to achieve the effect of suppressing the electronic flow circuit, avoiding galvanic corrosion, and having a dense and uniform structure

Active Publication Date: 2019-06-25
TIANJIN UNIVERSITY OF TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] 1. The strength of magnesium alloy can replace most of the parts of the car, but the key load-bearing structural parts and connecting parts of the material still cannot be replaced by magnesium alloy. To connect magnesium alloy automotive structural parts;
[0005] 2. Contact corrosion problem
Since this technology is based on the hot-dip aluminum coating technology, the problem of poor bonding between the aluminum coating and the substrate is particularly prominent in the hot-dip aluminum coating technology. Coating strength, wear resistance and corrosion resistance are far from meeting the requirements; secondly, the process is complicated, and the parameters in the process are strictly required, the production efficiency is low, and the production cost is high

Method used

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  • A boron-containing low-carbon steel oxide film layer and preparation method thereof
  • A boron-containing low-carbon steel oxide film layer and preparation method thereof
  • A boron-containing low-carbon steel oxide film layer and preparation method thereof

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preparation example Construction

[0028] The invention provides a method for preparing a boron-containing low-carbon steel oxide film layer, comprising the following steps:

[0029] Using boron-containing low-carbon steel as an anode, micro-arc oxidation is carried out in an electrolyte to obtain an oxide film layer of boron-containing low-carbon steel; the electrolyte includes 5-25 g / L of sodium metaaluminate and 2-10 g of sodium dihydrogen phosphate / L, sodium carbonate 2~15g / L and glycerol 2~8g / L.

[0030] In the invention, the boron-containing low-carbon steel is used as an anode, and micro-arc oxidation is carried out in an electrolytic solution to obtain an oxide film layer of the boron-containing low-carbon steel. In the present invention, the model of the boron-containing low-carbon steel is preferably 10B21. The boron-containing low-carbon steel selected in the present invention is different from non-ferrous metals such as Ti, Al, Mg in micro-arc oxidation to form their own oxide ceramic coatings, con...

Embodiment 1

[0058] 1) Pretreatment

[0059] After the crude 10B21 boron-containing low-carbon steel is mechanically polished, it is degreased in a sodium hydroxide solution at a temperature of 70°C, and then pickled in a mixed solution of hydrochloric acid and sulfuric acid (volume ratio: 3:1) for 3 minutes. The temperature is 70°C, and finally the pickled product is put into flowing clear water to remove the pickling solution involved in the surface to obtain 10B21 boron-containing low-carbon steel.

[0060] 2) Configure the electrolyte system; sodium metaaluminate 5g / L, sodium dihydrogen phosphate 2g / L, sodium carbonate 2g / L, glycerin 2g / L. Stir and dissolve in water according to the above ratio, and keep the pH value of the electrolyte solution at 8-12.

[0061] 3) Electrode installation: clamp the 10B21 boron-containing low-carbon steel into the electrolyte; select a hanging fixture with good conductivity, clamp the 10B21 boron-containing low-carbon steel to be treated by the micro-a...

Embodiment 2

[0065] 1) Pretreatment

[0066]After the crude 10B21 boron-containing low-carbon steel is mechanically polished, it is degreased in a sodium hydroxide solution at a temperature of 90°C, and then pickled in a mixed solution of hydrochloric acid and sulfuric acid (volume ratio: 3:1) for 20 minutes. The temperature is 30°C, and finally the pickled product is put into flowing clear water to remove the pickling solution involved in the surface to obtain 10B21 boron-containing low-carbon steel.

[0067] 2) Configure the electrolyte system; sodium metaaluminate 25g / L, sodium dihydrogen phosphate 10g / L, sodium carbonate 15g / L, glycerol 8g / L. Stir and dissolve in water according to the above ratio, and keep the pH value of the electrolyte solution at 8-12.

[0068] 3) Electrode installation: clamp the 10B21 boron-containing low-carbon steel into the electrolyte; select a hanging fixture with good conductivity, clamp the 10B21 boron-containing low-carbon steel to be treated by the micr...

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Abstract

A method for preparing a boron-containing low-carbon steel oxide film includes performing micro-arc oxidation on boron-containing low-carbon steel in an electrolyte by using the boron-containing low-carbon steel as an anode, to obtain a boron-containing low-carbon steel oxide film. The electrolyte contains sodium meta aluminate of 5 g / L to 25 g / L, sodium dihydrogen phosphate of 2 g / L to 10 g / L, sodium carbonate of 2 g / L to 15 g / L, and glycerol of 2 g / L to 8 g / L. The preparation method provided by the present invention has a simple and controllable process, and the obtained boron-containing low-carbon steel oxide film has a secure bond with the substrate, thus effectively avoiding occurrence of galvanic corrosion.

Description

technical field [0001] The invention relates to the technical field of metal surface treatment, in particular to a boron-containing low-carbon steel oxide film layer and a preparation method thereof. Background technique [0002] In recent years, the world's major car factories, iron and steel associations, aluminum associations and other organizations and some steel factories have successively conducted research on a number of automotive lightweight projects. In terms of material selection, magnesium alloys and other lightweight materials are used in automotive lightweighting. more and more. Materials based on aluminum-magnesium AZ91 series alloys have broad development prospects in automobiles. [0003] However, the application of aluminum-magnesium AZ91 series alloys in automobile lightweighting still has the following outstanding problems: [0004] 1. The strength of magnesium alloy can replace most parts of automobiles, but it is still impossible to use magnesium allo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D11/34C25D9/06
CPCC25D9/06C25D11/026C25D11/34C25D11/024C25D11/028
Inventor 陈民芳李言坤由臣刘海峰
Owner TIANJIN UNIVERSITY OF TECHNOLOGY
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