Magnesium alloy composite surface protective treatment equipment and magnesium alloy composite surface protective treatment method

A composite surface and processing equipment technology, applied in metal processing equipment, grinding/polishing equipment, surface polishing machine tools, etc., can solve problems such as fatigue strength reduction, improve corrosion resistance, reduce concentration gradient, and operate methods simple and easy effects

Active Publication Date: 2014-10-22
ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a magnesium alloy composite surface protection treatment equipment and method for the problem of fatigue strength reduction caused by anodic oxidation of magnesium alloys. The surface mechanical grinding is carried out at the same time as the anodic oxidation of magnesium alloys. Coatings are formed on the surface of magnesium alloys to improve the corrosion resistance of magnesium alloys. At the same time, the compressive stress introduced by surface mechanical grinding can offset the tensile stress generated by anodic oxidation, thereby reducing the damage of anodic oxidation to the fatigue properties of magnesium alloys.

Method used

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  • Magnesium alloy composite surface protective treatment equipment and magnesium alloy composite surface protective treatment method
  • Magnesium alloy composite surface protective treatment equipment and magnesium alloy composite surface protective treatment method
  • Magnesium alloy composite surface protective treatment equipment and magnesium alloy composite surface protective treatment method

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Embodiment 1

[0030] like figure 1 , 2 Shown in and 3, the magnesium alloy composite surface protection treatment equipment of the present embodiment comprises an anodizing device, a magnesium alloy sample rotating device and a surface mechanical grinding device, the anodizing device comprises an electrolytic cell 7, and the electrolytic cell 7 is filled with an electrolyte 15 , positive electrode 12-1 and negative electrode 12-2 are provided in the electrolytic cell 7, and positive electrode 12-1 and negative electrode 12-2 are connected by power supply 13, and the surface mechanical grinding device is made up of vibration generator 1 and some projectiles 16 , the vibration generator 17 is fixedly arranged under the electrolytic cell 7, and several projectiles 16 are placed on the lower plate of the electrolytic cell 7. The vibration frequency range of the vibration generator 17 is 10-1000 Hz, and several projectiles 16 are spherical ceramic shots and are enough to ensure impact The unifo...

Embodiment 2

[0039] The magnesium alloy composite surface protective treatment equipment and method in this embodiment are the same as in Example 1. In this example, the extruded magnesium alloy AZ31 fatigue sample is protected and treated, and the method is as follows:

[0040] First, the fatigue sample of the extruded magnesium alloy AZ31 is alkali-washed in an alkaline solution of the following composition:

[0041] sodium hydroxide 50g / L sodium phosphate 15g / L lubricant 30ml / L water margin

[0042] After water washing, pickling is carried out in the following acidic solution:

[0043] Phosphoric acid (85%) 350ml / L Sulfuric acid (98%) 15ml / L water margin

[0044] After water washing, anodic oxidation and surface mechanical grinding are carried out in the electrolyte solution of the following composition:

[0045] Phosphoric acid (H 3 PO 4 ) 50g / L Hydrofluoric acid (HF) 35g / L Boric acid (H 3 ...

Embodiment 3

[0048] The magnesium alloy composite surface protective treatment equipment and method in this embodiment are the same as in Example 1. In this example, the extruded magnesium alloy AZ31 fatigue sample is protected and treated, and the method is as follows:

[0049] The extruded state magnesium alloy AZ31 fatigue sample is carried out alkali washing and pickling with the solution of embodiment 2, and then anodic oxidation and surface mechanical grinding are carried out in the following electrolyte;

[0050] Potassium phosphate (K 3 PO 4 ) 60g / L Potassium borate (K 3 BO 3 ) 30g / L Potassium fluoride (KF, 30%) 30g / L water margin

[0051] use NH 4 OH (25%) to adjust the pH value to 7.5, using a current density of 1.3A / dm 2 The direct current: the final voltage is 300V; the solution temperature is 16 °C; the rotation speed of the sample rotating device is 30 revolutions / second, the diameter of the ceramic pellet is 1 mm, the vibration fre...

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Abstract

The invention discloses magnesium alloy composite surface protective treatment equipment. The magnesium alloy composite surface protective treatment equipment comprises an anodic oxidation device, wherein the anodic oxidation device comprises an electrolytic cell; an electrolyte is filled in the electrolytic cell; a positive electrode and a negative electrode are arranged in the electrolytic cell; the positive electrode and the negative electrode are connected by virtue of a power supply; the magnesium alloy composite surface protective treatment equipment disclosed by the invention further comprises a magnesium alloy sample rotary device and a surface mechanical grinding device. A vibration generator of the magnesium alloy composite surface protective treatment equipment disclosed by the invention can be used for carrying out surface mechanical grinding on a magnesium alloy sample by vibrating spherical pills on an electrolytic cell lower plate, and circular rod-shaped sample rotary device can drive the magnesium alloy sample to rotate at a uniform speed, so that the surface of the magnesium alloy sample is subjected to uniform mechanical grinding treatment; residual pressure stress is introduced on the surface of the magnesium alloy sample oxidized by an anode to resist residual tensile stress generated by anode oxidization on the surface of the magnesium alloy sample, so that damages on fatigue performances of the magnesium alloy by anode oxidization are lowered while corrosion resistance of the magnesium alloy sample is improved, and therefore, an operation method is simple and practicable.

Description

technical field [0001] The invention relates to equipment and methods in the technical field of magnesium alloy surface treatment, in particular to equipment and methods for composite surface protection treatment of magnesium alloys. Background technique [0002] Magnesium alloy materials have good application prospects in aerospace and automotive fields due to their excellent physical, chemical, and mechanical properties, as well as light specific gravity, high specific strength and specific stiffness, and good thermal and electrical conductivity. However, the electrochemical stability of magnesium is low, the standard equilibrium potential is very negative, and the corrosion resistance is poor, which restricts its due advantages. Therefore, the surface protection treatment of magnesium alloy products must be carried out before use to meet the use environment. requirements. Among the numerous surface protection treatment methods for magnesium alloys, the anodic oxidation m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/30B24B31/06
Inventor 李子炯运高谦石开常同钦代海洋
Owner ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY
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