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Anodic oxidation treatment process of die-casting aluminum alloy for digital electronic product

A technology of anodizing and treatment process, applied in the field of aluminum alloy, can solve the problem of low specific strength, and achieve the effect of inhibiting the deterioration of fatigue performance and ensuring performance

Active Publication Date: 2014-01-01
苏州利达铸造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the specific strength of aluminum alloys is lower than that of magnesium alloys, so how to improve the mechanical strength of commercially available aluminum alloys is an important topic that has attracted great attention at present.

Method used

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  • Anodic oxidation treatment process of die-casting aluminum alloy for digital electronic product
  • Anodic oxidation treatment process of die-casting aluminum alloy for digital electronic product
  • Anodic oxidation treatment process of die-casting aluminum alloy for digital electronic product

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-3， and comparative example 1-5

[0016] 1) Raw material preparation: Prepare raw materials according to the alloy composition ratio in Table 1, including pure aluminum with a purity of 99.9%, aluminum-silicon alloy with a silicon content of 12-15%, aluminum-zinc alloy with a zinc content of 10-15%, electrolytic Copper, electrolytic nickel, industrial pure magnesium, industrial pure zirconium, industrial pure titanium and other raw materials.

[0017] 2) Melting: Preheat the above-mentioned raw materials to at least 200°C, then heat the pure aluminum in a melting furnace to 800°C, then add electrolytic copper, electrolytic nickel, commercially pure zirconium and pure titanium, and keep stirring until All the raw materials are melted, then lower the temperature to 720°C and add aluminum-silicon alloy and aluminum-zinc alloy and continue to stir until the raw materials are completely melted, then lower the temperature to 660°C and press industrial pure magnesium to the bottom of the melt for at least 5 minutes, t...

Embodiment 6-7

[0040] Examples 6-7, and Comparative Examples 14-18, the chemical composition of the alloy is the same as that of Example 2, and the optimal selection of the parameters of the electrolyte composition in the two anodic oxidations is mainly investigated. The selection of parameters and performance results are shown in Table 3 , wherein the current density, voltage and oxidation time are the same as in Example 2.

[0041] table 3

[0042]

[0043] In addition to the experiments in Table 3, the conventional CAA method and SAA method were also used to anodize aluminum alloys with the same composition, and the results showed that the fatigue strength could only reach 2×10 4 About the order of magnitude, far less than this application.

[0044] The above results show that the composition of the two-time anodic oxidation has an important influence on the fatigue strength of the alloy. Firstly, the fatigue strength of the two-time anodic oxidation has obvious advantages compared wi...

Embodiment 8-9

[0046] Examples 8-9, and comparative examples 19-22, the chemical composition of the alloy is the same as that of Example 2, and the optimal selection of parameters such as current density, voltage and oxidation time in the two anodic oxidations, the selection of parameters and the performance The results are shown in Table 4, wherein the composition of the electrolyte is the same as in Example 2.

[0047] Table 4

[0048]

[0049] From the results in Table 4, it can be seen that the current density of anodic oxidation should not be too small, otherwise it will make the order of the pores of the oxide film difficult to meet the requirements and become the source of fatigue damage, but the current density should not be too large, otherwise the pores will Excessive pit depth can also become a source of fatigue damage. The oxidation time should not be too short, otherwise it will not meet the basic requirements of anodic oxidation, and it will not be conducive to improving th...

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Abstract

The invention provides die-casting aluminum alloy for a digital electronic product and a corresponding anodic oxidation treatment process of the die-casting aluminum alloy. The conditions of primary anodic oxidation are that sulfuric acid is 100 to 120 g / L, citric acid is 10 to 15 g / L, lactic acid is 5 to 8 g / L, the current density is 0.8 to 1 A / dm<2>, the voltage is 15 to 18 V, and the oxidation time is 15 to 20 min; and the conditions of secondary anodic oxidation are that mixed sulfuric acid and aluminum sulfate (the molar ratio is 10:1) is 120 to 150 g / L, citric acid is 15 to 20 g / L, lactic acid is 5 to 8 g / L, the current density is 1.2 to 1.5 A / dm<2>, the voltage is 18 to 20 V, and the oxidation time is 60 to 80 min. The die-casting aluminum alloy for the digital electronic product with excellent performance is obtained through an optimal secondary oxidation process and reasonable parameter control.

Description

technical field [0001] The invention relates to the technical field of aluminum alloys, and in particular provides a die-casting aluminum alloy for digital electronic products and an anodic oxidation treatment process thereof. Background technique [0002] With the rapid development of the digital electronics industry and the communication industry, the popularity of electronic products such as mobile phones, notebook computers, and digital cameras is increasing day by day, becoming necessary daily necessities for everyone. In order to improve the market competitiveness of various electronic products, manufacturers not only actively improve the performance of digital electronic products, but also try their best to improve the aesthetics and portability of the products, so as to gain more favor from consumers. Therefore, all kinds of digital electronic products are developing towards lightness, thinness, shortness, and smallness. Especially mobile phones and notebook computer...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/12C22C1/03C22C1/06C22C21/10B22D17/00
Inventor 季吉清
Owner 苏州利达铸造有限公司
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