Corrosion-resistant aluminum alloy

A corrosion-resistant aluminum alloy and aluminum alloy technology, applied in anodic oxidation, electrolytic coating, surface reaction electrolytic coating, etc., can solve the problems of substrate and oxide film peeling, cracks, etc., to reduce porosity and improve surface density , the effect of reducing heat intensity

Pending Publication Date: 2021-12-07
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, those skilled in the art know that in laser melting, cracks and pores are easy to appear in the cladding layer. The laser power used in this field is 900W, and its temperature is extremely high. While melting the powder, the micro-arc oxidation film It is also melted together, but at such a high temperature, it is known that the micro-arc oxidation film, which is originally effective in bonding with aluminum, is very easy to cause cracks due to the thermal stress generated by laser melting, and even the peeling of the substrate and the oxide film

Method used

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  • Corrosion-resistant aluminum alloy
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] A corrosion-resistant aluminum alloy prepared by the following method:

[0058] (1) Surface pretreatment:

[0059] (a) Mechanical grinding: the aluminum alloy samples are polished with 800# and 1200# sandpaper respectively;

[0060] (b) Degreasing: 12wt.% sulfuric acid, 1.5wt.% surfactant, room temperature, 5min; washing: distilled water, 15s;

[0061] (c) pickling; nitric acid 15wt.%; sulfuric acid 10wt.%; room temperature; time: 4min; water washing: distilled water, 15s.

[0062] (2) Micro-arc oxidation to obtain micro-arc oxidation film ceramic layer: Na 2 SiO 3 5g / L, NaOH1g / L, Na2WO4 1g / L; glycerin 4ml / L; positive voltage 300V, negative voltage 100V, positive duty cycle 15%, negative duty cycle 5%, pulse frequency 300Hz, oxidation Time 200min.

[0063] (3) Multiple coatings of nickel nano-dispersion liquid: the size of nickel in the nickel nano-dispersion liquid is 50-100nm, and the content is 15wt.%.

[0064] The multiple coating is to use a vacuum spin coate...

Embodiment 2

[0070] A corrosion-resistant aluminum alloy prepared by the following method:

[0071] (1) Surface pretreatment:

[0072] (a) Mechanical grinding: the aluminum alloy samples are polished with 800# and 1200# sandpaper respectively;

[0073](b) Degreasing: 14wt.% sulfuric acid, 2wt.% surfactant, room temperature, 6 minutes; washing: distilled water, 17.5s;

[0074] (c) pickling; nitric acid 20wt.%; sulfuric acid 12.5wt.%; room temperature; time: 5min; water washing: distilled water, 17.5s.

[0075] (2) Micro-arc oxidation to obtain micro-arc oxidation film ceramic layer: Na 2 SiO 3 20g / L, NaOH1.5g / L, Na2WO4 3g / L; glycerol 5ml / L; forward voltage 400V, negative voltage 150V, positive duty cycle 20%, negative duty cycle 7.5%, pulse frequency 350Hz , oxidation time 30min.

[0076] (3) Multiple coatings of nickel nano-dispersion liquid: the size of nickel in the nickel nano-dispersion liquid is 50-100nm, and the content is 17.5wt.%.

[0077] The multiple coating is to use a vac...

Embodiment 3

[0083] A corrosion-resistant aluminum alloy prepared by the following method:

[0084] (1) Surface pretreatment:

[0085] (a) Mechanical grinding: the aluminum alloy samples are polished with 800# and 1200# sandpaper respectively;

[0086] (b) Degreasing: 15wt.% sulfuric acid, 2.5wt.% surfactant, room temperature, 7min; washing: distilled water, 20s;

[0087] (c) pickling; nitric acid 25wt.%; sulfuric acid 15wt.%; room temperature; time: 6min; water washing: distilled water, 20s.

[0088] (2) Micro-arc oxidation to obtain micro-arc oxidation film ceramic layer: Na 2 SiO 3 15g / L, NaOH2g / L, Na2WO4 5g / L; glycerin 6ml / L; forward voltage 500V, negative voltage 200V, positive duty 15~25%, negative duty 10%, pulse frequency 400Hz, Oxidation time 40min.

[0089] (3) Multiple coatings of nickel nano-dispersion liquid: the size of nickel in the nickel nano-dispersion liquid is 50-100nm, and the content is 20wt.%.

[0090] The multiple coating is to use a vacuum spin coater, the ro...

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Abstract

The invention provides a corrosion-resistant aluminum alloy. The surface of the aluminum alloy is subjected to micro-arc oxidation treatment to obtain a micro-arc oxidation film, molten nickel metal solids are arranged in micropores in the surface of the micro-arc oxidation film, and then medium-temperature nickel is used for pore sealing to obtain the surface-compact micro-arc oxidation aluminum alloy with the porosity being 2-3%. The aluminum alloy has high corrosion resistance.

Description

technical field [0001] The invention belongs to the technical field of surface treatment of aluminum alloy materials, and relates to a high-performance, high-corrosion-resistant aluminum alloy material. [0002] technical background [0003] Micro-arc oxidation technology is a technology with a relatively complicated mechanism but a simple production process. It can prepare a film structure with excellent performance on the metal surface in situ, thereby strengthening the original properties of the metal or making the metal have new properties. It is referred to as MAO or PEOs. At present, this technology mainly induces a high-density micro-arc plasma group at the contact interface between the metal substrate and the electrolyte by using short pulses of high-intensity electric energy in an environmentally friendly alkaline electrolyte. React in-situ high-temperature sintering to form a high-performance micro-arc oxidation ceramic layer. The working process is generally: alum...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): C25D11/02C25D11/06C25D11/16C25D11/18
CPCC25D11/024C25D11/06C25D11/16C25D11/18
Inventor喻馨
Owner喻馨