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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 the magnesium alloy cannot be easily and firmly bonded to various workpieces, and the use of cheap magnesium alloys has been severely limited so far.

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

Embodiment 1

[0179] Utilize the method of the present invention below to carry out surface treatment to the magnesium alloy sheet material (workpiece state T7) of 7 American standard LA141A that number is 1-7, and step is as follows:

[0180] (i) At room temperature, prepare an isopropanol solution (skimming composition) containing lactic acid and sodium dodecylsulfonate with a concentration of 50g / L and 0.5g / L respectively, and put the solution into an ultrasonic Put the 7 workpieces into the oscillator, set the ultrasonic frequency to about 330kHz, and after about 5 minutes, wash the workpieces with water.

[0181] (ii) At room temperature, prepare a chemical polishing solution containing hydrofluoric acid, ammonium fluoride and nitric acid with a concentration of 60cc / L, 40g / L and 40g / L, and put the chemical polishing solution into 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 0....

Embodiment 2

[0197] Carry out surface treatment to the magnesium alloy sheet material (workpiece state T7) that is numbered 10 US standard LA141A of 8-17 with the same step as embodiment 1, the place that is different from embodiment 1 is: the electroplating of step (vi) is It is carried out in a Hull cell with high and low current areas, wherein the current density in the high current area is 5A / dm2, and the current density in the low current area is 1A / dm2.

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

[0199] For the high and low current regions of the 10 workpieces processed in Example 2, the thickness measurement and appearance glossiness observation of the coating film (formed by stacking each coating layer on the magnesium alloy) were carried out respectively. The thickness of the coating was measured using the German INOX clamp gauge, and the results are shown in Table 2. As for the appearance glossiness of the nickel coating, there is ...

Embodiment 3-8

[0203] Using the same steps as in Example 1, surface treatment was carried out on the magnesium alloy plates of different specifications listed in Table 3 below, and the corrosion resistance and bending adhesion were tested in the same manner as above, and the thickness was measured.

[0204] Example

Workpiece / magnesium content%

Coating thickness

μm

Salt spray experiment

result grade

bending attachment

test results

3

AZ31B / 94.7%

37.5

10

no peeling

4

AZ61A / 91.0%

39.0

10

no peeling

5

ZK60A / 93.6%

39.5

10

no peeling

6

HM21A / 96.4%

37.0

10

no peeling

7

HK31a / 95%

36.5

10

no peeling

8

EZ33A / 92.1%

38.0

10

no peeling

[0205] result:

[0206] It can be seen from Table 3 that after the magnesium alloy workpieces with different compositions and conten...

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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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