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Electrolyte applied to laser coupling microplasma arc oxidation of 7075 aluminum alloys

A micro-plasma, arc oxidation technology, applied in anodizing, electrolytic coatings, surface reaction electrolytic coatings, etc., can solve the problems of stress corrosion cracking, poor corrosion resistance, etc.

Active Publication Date: 2016-08-10
JIANGSU UNIV OF TECH
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  • Description
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Problems solved by technology

However, 7075 aluminum alloy cannot be welded, and its corrosion resistance is quite poor, and it has a tendency of stress corrosion cracking, so it needs to be coated with aluminum or other protective treatments.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1）

[0011] The electrolyte composition of the present embodiment is as follows: the sodium silicate Na of 12g 2 SiO 3 , 4g of sodium hydroxide NaOH, 1.2g of sodium tungstate Na 2 WO 4 , 6.5g of sodium aluminate Na 2 al 2 o 4 , 0.4g of lanthanum nitrate hexahydrate La(NO 3 ) 3 ·6H 2 O, 2.5 g of disodium edetate C 10 h 14 N 2 o 8 Na 2 2H 2 O, make up to 1L with deionized water.

Embodiment 2～ Embodiment 5）

[0013] The electrolyte solution of each embodiment is basically the same as that of Embodiment 1, and the differences are shown in Table 1.

[0014] Table 1

[0015] Example 1 Example 2 Example 3 Example 4 Example 5 Na 2 SiO 3 12g 10 11 12 24g NaOH 4g 3 3.5 4 7g Na 2 WO 4 1.2g 1.0 1.3 1.5 2.5g Na 2 al 2 o 4 6.5g 6 6.5 7 13g La(NO 3 ) 3 ·6H 2 o 0.4g 0.3 0.4 0.5 0.8g C 10 h 14 N 2 o 8 Na 2 2H 2 o 2.5g 2 2.5 3 5g Deionized water Make up to 1L Make up to 1L Make up to 1L Make up to 1L Make up to 2L

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Abstract

The invention discloses an electrolyte applied to laser coupling microplasma arc oxidation of 7075 aluminum alloys. The electrolyte comprises the following components according to concentration: 1-30g / L of Na2SiO3, 0.5-10g / L of NaOH, 0.1-5g / L of Na2WO4, 1-20g / L of Na2Al2O4, 0.05-2.0g / L of La(NO3)3.6H2O, 0.5-10g / L of C10H14N2O8Na2.2H2O and the balance of deionized water. According to the electrolyte applied to laser coupling microplasma arc oxidation of 7075 aluminum alloys, a lot of experiments finally show that voltage and power of a micro arc oxidation power supply can be further reduced by adding sodium aluminate and lanthanum nitrate hexahydrate on the basis of the conventional micro arc oxidation electrolyte; oxidization ceramic layers with micro hardness being higher than 2000HV can be obtained by oxidizing under lower voltage being lower than 400V and lower power being lower than 120kW of the power supply.

Description

technical field [0001] The invention belongs to the technical field of aluminum alloy surface ceramic oxidation, and in particular relates to an electrolyte used for laser-coupled micro-plasma arc oxidation of 7075 aluminum alloy. Background technique [0002] 7-series aluminum alloy is a commonly used alloy, which contains zinc and magnesium. Among the more common 7-series aluminum alloys, the strongest strength is 7075 alloy. 7075 aluminum alloy has good mechanical properties and anodic reaction, and is widely used in aerospace. , mold processing, mechanical equipment, fixtures and other fields, especially for the manufacture of aircraft structures and other high-stress structures that require high strength and strong corrosion resistance. However, 7075 aluminum alloy cannot be welded, and its corrosion resistance is quite poor, and it has a tendency to stress corrosion cracking, so it needs to be used with aluminum cladding or other protective treatments. The surface tre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/06
CPCC25D11/026C25D11/06
Inventor 王辉左健民
Owner JIANGSU UNIV OF TECH
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