Method for treating magnesium-alloy workpiece, workpiece therefrom and composition therewith

A surface treatment, magnesium alloy technology, applied in the direction of cleaning methods and appliances, cleaning methods using liquids, chemical instruments and methods, etc., can solve the problems that the covering layer cannot be firmly bonded, cannot effectively resist corrosion, and the use of magnesium alloys is limited.

Inactive Publication Date: 2007-11-21
GREAT MAGTECH TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition to the problem of ineffective corrosion resistance, these coatings cannot be firmly bonded to the magnesium alloy, so that the work of t

Method used

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  • Method for treating magnesium-alloy workpiece, workpiece therefrom and composition therewith
  • Method for treating magnesium-alloy workpiece, workpiece therefrom and composition therewith
  • Method for treating magnesium-alloy workpiece, workpiece therefrom and composition therewith

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0178]

[0179] The following uses the method of the present invention to perform surface treatment on 7 pieces of American standard LA141A magnesium alloy plates (workpiece state T7) numbered 1-7. The steps are as follows:

[0180] (i) At room temperature, prepare an isopropanol solution (degreased composition) containing lactic acid and sodium dodecyl sulfonate at a concentration of 50 g / L and 0.5 g / L, and place the solution in an ultrasonic wave Then, put the 7 workpieces into the vibrator, and set the ultrasonic frequency to about 330kHz for about 5 minutes, and then wash the workpieces with water.

[0181] (ii) At room temperature, prepare a chemical polishing solution containing hydrofluoric acid, ammonium fluoride and nitric acid with concentrations of 60cc / L, 40g / L and 40g / L, and place the chemical polishing solution in an ultrasonic oscillator , And put the 7 workpieces cleaned in step (i) into the oscillator, and set the ultrasonic frequency to about 330kHz, after about...

Example Embodiment

[0196]

[0197] The surface treatment is performed on 10 pieces of American standard LA141A magnesium alloy plates (workpiece state T7) numbered 8-17 in the same steps as in Example 1. The difference from Example 1 is that the electroplating in step (vi) is It is performed in a Hull cell with high and low current zones, where the current density in the high current zone is 5A / dm2, and the current density in the low current zone is 1A / dm2.

[0198] The thickness and appearance of the workpiece 8-17 obtained by surface treatment

[0199] The high and low current regions of the 10 workpieces processed in Example 2 were respectively subjected to the thickness measurement and appearance gloss observation of the plating film (formed by each plating layer on the magnesium alloy). Among them, the thickness of the coating is measured using the German INOX clamp gauge. The results are shown in Table 2. As for the appearance glossiness of nickel coatings, there is currently no standard meas...

Example Embodiment

[0202]

[0203] Following the same steps as in Example 1, surface treatment was performed on the magnesium alloy sheets of different specifications in Table 3 below, and the corrosion resistance and bending adhesion were tested in the same manner as described above, and the thickness was measured.

[0204] Example

[0205] result:

[0206] It can be seen from Table 3 that after the magnesium alloy workpieces with different compositions and contents are processed by the method in this case, the coating and the magnesium alloy layer have excellent adhesion, especially through the removal of intercrystalline materials, replacement activation, electroless plating and heat treatment And other steps, the unexpected effect caused by the obtained transition layer is also because the transition layer itself and the magnesium alloy layer are joined in the same way as the crystal form. Therefore, the aforementioned workpieces can be plated with a coating film of about 40μm, and th...

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Abstract

A method for treating magnesium-alloy work-piece surface, its work piece, its degrease surface treatment and non-electroplating nickel composition are disclosed. The process is carried out by forming displacing and activating layer containing nickel and metal M crystal seed on surface layer exposed with magnesium-alloy solid melt and heat treating. It has strong adhesion and long-period anti-corrosive function.

Description

technical field [0001] The present invention relates to a method for surface treatment of a magnesium alloy workpiece, in particular to a method for sequentially performing conversion activation on a exposed surface layer of a solid solution of hexagonal close-packed crystal form ), electroless plating (electroless plating) and heat treatment surface treatment methods, and the magnesium alloy workpiece with a stable bonding transition layer obtained through the treatment of the method, and various components required for implementing the method. Background technique [0002] It is known that magnesium alloy (Magnesium alloy) is light in weight, high in structural strength, and cheap. It should play an important role in industrial materials. However, due to the high difficulty of surface treatment, magnesium alloys cannot be effectively commercialized and mass-produced. The main reasons are as follows: (1) Magnesium is a very active metal element, which can be corroded by mos...

Claims

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Application Information

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IPC IPC(8): C23C28/00C23G1/02C23C18/00C25D3/02B08B3/12
CPCC23C18/50C23C18/1653C23C18/1692C23C18/36C23C18/1831C23C26/00C23C18/1651
Inventor 何靖李威德
Owner GREAT MAGTECH TECH CO LTD
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