Mixed acid anodizing and hole sealing method of magnesium-containing high-silicon-content wrought aluminum alloy surface

A deformed aluminum alloy and anodic oxidation technology, which is applied in the field of alloy surface treatment, can solve the problems of poor corrosion resistance and achieve the effect of improving corrosion resistance

Inactive Publication Date: 2012-01-18
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to make up for the gap in the existing surface treatment technology for the surface treatment of magnesium-containing and high-silicon deformed aluminum alloys, and aiming at the shortcomings of poor corrosion resistance of magnesium-containing and high-silicon deformed aluminum alloys, the present invention provides a surface-mixed magnesium-containing and high-silicon deformed aluminum alloy A method of acid anodizing and sealing to improve the corrosion resistance of magnesium-containing high-silicon deformed aluminum alloys

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] (1) Pretreatment

[0039] Select a magnesium-containing high-silicon deformed aluminum alloy workpiece with a silicon content of 10wt%, grind it successively with 300# water, 600#, 800# and 1000# water sandpaper, and then polish it with a polishing machine to make the workpiece form a glossy surface; Then it was placed in acetone and ultrasonicated for 10 minutes for degreasing treatment; then it was placed in an alkali bath at 60°C for 3 minutes, and the mixed lye composition in the alkali bath was: 5g / L NaOH, 20g / L NaOH 3 PO 4 and 20g / L Na 2 CO 3 ; After alkali etching, move the workpiece to a clean water tank for cleaning within 1 min, and after staying for 1 min, put it into an acid tank for pickling at a constant temperature of 100°C for 2 min. The composition of the acid solution in the acid tank is: 600 g / L H with a mass concentration of 85% 3 PO 4 , 400 g / L mass concentration of 98% H 2 SO 4 , 5g / L Na 2 CO 3 ; Soak the workpiece after pickling in a clea...

Embodiment 2

[0045] (1) Pretreatment

[0046] Select a magnesium-containing high-silicon deformed aluminum alloy workpiece with a silicon content of 15wt%, and polish it with 300#, 600#, 800# and 1000# water sandpaper successively, and then polish it with a polishing machine to make the workpiece form a glossy surface; then Put it in acetone for 10 minutes to remove oil; then put it in an alkali bath at 65°C for 2 minutes, and the mixed alkali solution in the alkali bath is: 5g / L NaOH, 20g / L NaOH 3 PO 4 and 20g / L Na 2 CO 3 ; After alkali etching, move the workpiece to the clean water tank for cleaning within 1 minute, and after staying for 1 minute, put it into the acid tank for pickling at a constant temperature of 98°C for 3 minutes. The composition of the acid solution in the acid tank is: 600 g / L H with a mass concentration of 85% 3 PO 4 , 400 g / L mass concentration of 98% H 2 SO 4 , 5g / L Na 2 CO 3 ; Soak the workpiece after pickling in a clear water tank for 1min, and then dr...

Embodiment 3

[0052] (1) Pretreatment

[0053] Select a magnesium-containing high-silicon deformed aluminum alloy workpiece with a silicon content of 11wt%, polish it with 300#, 600#, 800# and 1000# water sandpaper successively, and then polish it with a polishing machine to make the workpiece form a glossy surface; then Put it in acetone and ultrasonicate for 10 minutes for degreasing treatment; then put it in an alkali tank for alkaline etching at 60°C for 3 minutes, the mixed lye composition in the alkali tank is: 5g / L NaOH, 20g / L NaOH 3 PO 4 and 20g / L Na 2 CO 3 ; After alkali etching, move the workpiece to the clean water tank for cleaning within 1 minute, and after staying for 1 minute, put it into the acid tank for pickling at a constant temperature of 99°C for 3 minutes. The composition of the acid solution in the acid tank is: 600 g / L H with a mass concentration of 85% 3 PO 4 , 400 g / L mass concentration of 98% H 2 SO 4 , 5g / L Na 2 CO 3 ; Soak the workpiece after pickling i...

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PUM

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Abstract

The invention belongs to the technical field of alloy surface treatment, and particularly relates to a mixed acid anodizing and hole sealing method of a magnesium-containing high-silicon-content wrought aluminum alloy surface, which comprises the following steps that: after a magnesium-containing high-silicon-content wrought aluminum alloy workpiece with the silicon content of up to 10-15wt% is pre-treated, a mixed acid liquid of 150-180g/L of H2SO4 and 5-15g/L of organic acid is used as an electrolytic liquid, the magnesium-containing high-silicon-content wrought aluminum alloy workpiece is subjected to DC (direct current) anodic oxidation for 20-25min at room temperature at the current density of 1.2-1.8A/dm<2>, and then is subjected to boiling water sealing, cold sealing, nickel acetate sealing or stearic acid hole sealing. In the acid anodizing and hole sealing method, a layer of anodic oxide film is prepared on the surface of magnesium-containing high-silicon-content wrought aluminum alloy by controlling anodizing process parameters and hole sealing process conditions, thereby improving the corrosion resistance of the surface of the magnesium-containing high-silicon-content wrought aluminum alloy.

Description

technical field [0001] The invention belongs to the technical field of alloy surface treatment, and in particular relates to a method for mixed acid anodic oxidation and hole sealing on the surface of deformed aluminum alloy containing magnesium and high silicon. Background technique [0002] Magnesium-containing high-silicon deformed aluminum alloy, with a silicon content as high as 10-15wt%, is a new type of aluminum alloy developed by my country with completely independent intellectual property rights. It is a typical resource-saving, environment-friendly high-performance and low-cost new material . It has room temperature strength superior to 6XXX series deformed aluminum alloys and comparable plasticity, and has broad application space in civil and industrial fields. However, adding a high content of silicon to the aluminum matrix can improve its casting performance, increase the hardness and strength of the material, but also reduce its corrosion resistance. [0003] ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/08C25D11/10C25D11/18
Inventor 牛盾王林山刘林月于福晓左良
Owner NORTHEASTERN UNIV
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