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.
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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
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