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Electrolyte for surface treatment of 7075 aluminum alloy

A surface treatment and electrolyte technology, applied in the direction of surface reaction electrolytic coating, electrolytic coating, anodic oxidation, etc., can solve the problems of stress corrosion cracking and poor corrosion resistance

Active Publication Date: 2018-09-28
JIANGSU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 , 6.5 g 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]

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Abstract

The invention discloses electrolyte for surface treatment of a 7075 aluminum alloy. The electrolyte comprises the following components by concentration: 12 g / L of Na2SiO3, 4 g / L of NaOH, 1.2 g / L of Na2WO4, 6.5 g / L of Na2Al2O4, 0.4 g / L of La(NO3)3.6H2O, 2.5 g / L of C10H14N2O8Na2.2H2O, and the balance of de-ionized water. Through a lot of experiments, sodium aluminate and lanthanum nitrate hexahydrate can be added on the basis of conventional micro-arc oxidation electrolyte to further reduce the micro-arc oxidation power supply voltage and power supply power, that is, an oxide ceramic layer witha microscopic hardness above 2000 HV can be obtained through oxidation under the conditions of lower power supply voltage (below 400 V) and lower power supply power (below 120 kW).

Description

[0001] This application is a divisional application of the invention patent application with the application number 201610347251.6, the application date is May 24, 2016, and the invention title is "Electrolyte for Laser-Coupled Micro-plasma Arc Oxidation of 7075 Aluminum Alloy". technical field [0002] 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 [0003] 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 hig...

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