Aluminum alloy electric heater anode oxide film and preparation method thereof

A technology of anodic oxidation film and electric heater, which is applied in the direction of anodic oxidation, electrolytic coating, surface reaction electrolytic coating, etc. It can solve the problems of large pore size, poor corrosion resistance and high porosity of anodic oxidation film, and achieve uniform performance of the film layer Guaranteed, high corrosion resistance, low porosity effect

Inactive Publication Date: 2018-12-25
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In coastal areas or areas with severe acid rain, after the air conditioner has been used for a period of time, the surface of the electric heater is pulverized: the surface of the 3003 aluminum alloy air conditioner heater is corroded to form white powder, and the powder falls into the room with the airflow during the use of the air conditioner, causing pollution

Method used

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  • Aluminum alloy electric heater anode oxide film and preparation method thereof
  • Aluminum alloy electric heater anode oxide film and preparation method thereof
  • Aluminum alloy electric heater anode oxide film and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0036] In this example, the aluminum alloy sample (that is, the aluminum alloy workpiece) is made of 3003 aluminum alloy, and its chemical composition and content (wt%) are: Mn 1.0-1.5, Fe 0.7, Si 0.6, Cu 0.05-0.2, Zn 0.1 balance for aluminum. The preparation of composite acid anodic oxidation film is specifically completed by the following steps:

[0037] (1) Mechanical grinding: use 180#, 320#, 400# sandpaper to polish the surface of the workpiece respectively.

[0038] (2) Alkali cleaning: put the aluminum alloy in a solution containing 30g / L Na 3 o 4 , 25g / L Na 2 CO 3 , 2g / L OP-10 solution container at 40 ° C for 3 minutes, the workpiece after alkali washing is first washed with hot water at 90 ~ 95 ° C, and then washed with cold water to clean.

[0039] (3) Pickling and activation: Put the workpiece after alkali washing and cleaning into the solution containing 30% HNO 3 Pickling and activation at room temperature for 60s, and the workpiece after pickling was cleane...

Embodiment 2

[0047] The operation method is the same as that in Example 1, except that in step (5) during the anodic oxidation process, the electrolyte composition is: 70g / L sulfosalicylic acid, 30g / L boric acid, 25g / L oxalic acid, 2mL / L sulfuric acid, 150g / L Aluminum sulfate octadecahydrate; current density 3.5A / dm 2 .

Embodiment 3

[0049] The operation method is the same as that in Example 1, except that in step (5) during the anodic oxidation process, the electrolyte composition is: 50g / L sulfosalicylic acid, 20g / L boric acid, 15g / L oxalic acid, 2mL / L sulfuric acid, 150g / L Aluminum sulfate octadecahydrate; current density 2.5A / dm 2 .

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Abstract

The invention discloses an aluminum alloy electric heater anode oxide film and a preparation method thereof and belongs to the technical field of preparation of film materials. The preparation methoddisclosed by the invention comprises the following steps: adding multiple acids such as sulfosalicylic acid, boric acid, oxalic acid, sulfuric acid, aluminum sulfate octadecahydrate and the like intoelectrolyte, performing mixed acid anodic oxidation treatment at the temperature of 3-10 DEG C for 40 minutes under the mechanical stirring condition, wherein the current density is 1.5-2.5A/dm<2>. The preparation method disclosed by the invention is simple and feasible in process, and the prepared anode oxide film has high corrosion resistance.

Description

technical field [0001] The invention relates to a method for metal surface treatment, in particular to an anodic oxidation film of an aluminum alloy electric heater and a preparation method thereof, belonging to the technical field of film material preparation. Background technique [0002] In coastal areas or areas with severe acid rain, after the air conditioner has been used for a period of time, the surface of the electric heater is pulverized: the surface of the 3003 aluminum alloy air conditioner heater is corroded to form white powder, and the powder falls into the room with the airflow during the use of the air conditioner, causing pollution Home environment, or be inhaled into the human body, endangering health. [0003] In the atmospheric environment, the surface of 3003 aluminum alloy is easy to form a very thin passivation film (γ-Al 2 o 3 ), the passivation film on the surface can be regenerated, which makes the 3003 aluminum alloy have certain corrosion resis...

Claims

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Application Information

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IPC IPC(8): C25D11/16C23G1/22C23G1/12C25D11/08C25D11/10C25D11/24
CPCC23G1/125C23G1/22C25D11/08C25D11/10C25D11/16C25D11/24
Inventor 邵红红陈天亮方彦博向文艺陈乐利
Owner JIANGSU UNIV
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