Manufacturing method of magnesium alloy products
A manufacturing method, magnesium alloy technology, applied in the direction of anodizing, etc., can solve the problems of labor, time and cost
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Embodiment 1
[0064] [test piece]
[0065] The magnesium alloy of ASTM No. AZX911 composed of 89% by weight of magnesium, 9% by weight of aluminum, 1% by weight of zinc and 1% by weight of calcium is used as a raw material, and an alloy plate (size 170mm×50mm×2mm cast by the hot chamber method) is used as a test piece. here, figure 1 It is a photograph of the surface of this magnesium alloy. figure 1 The site surrounded by the line is the site with high calcium concentration. Such as figure 1 As shown, it can be seen that calcium locally exists on the surface of the magnesium alloy.
[0066] Then, after performing [pretreatment 1] to [pretreatment 3] described below on the above-mentioned test piece, [film formation treatment] was performed.
[0067] [Pre-processing 1]
[0068] As pretreatment 1, the test piece was immersed in an acidic aqueous solution at 65° C. containing 0.25 mol / L phosphoric acid and a small amount of surfactant for 60 seconds, and washed with ion-exchanged water....
Embodiment 2
[0078] Example 2 is an example of anodizing treatment using the Dow17 method. Except for the anodizing treatment, it is the same as in Example 1. Prepare an electrolyte solution containing 300 g / L of acidic ammonium fluoride, 100 g / L of sodium dichromate and 90 g / L of phosphoric acid, and keep it at 80°C. Here, the test piece subjected to the same pretreatment as in Example 1 was dipped as an anode, and anodized. As the cathode at this time, the same cathode as in Example 1 was used. Using a constant voltage power supply, set the applied voltage to 90 volts and energize for 600 seconds. After energization, it was washed with ion-exchanged water, nitric acid aqueous solution, and ion-exchanged water in this order, followed by drying.
[0079] The film thickness of this anodized film is about 20 μm. The obtained anodized coating contains 19.4% by weight of magnesium, 19.0% by weight of oxygen, 12.9% by weight of phosphorus, 1.3% by weight of aluminum, 22.2% by weight of chro...
Embodiment 3
[0081] In Example 3, the same treatment as in Example 1 was performed except that the pretreatment 2 of Example 1 was performed as follows. The test piece was immersed for 60 seconds in a 1.6 mol / L acidic ammonium fluoride aqueous solution (25° C.) adjusted to pH 2 by adding phosphoric acid, and washed with ion-exchanged water.
[0082] The film thickness of this anodized film is about 10 μm. The obtained anodized film contained 24.0% by weight of magnesium element, 47.8% by weight of oxygen element, 25.0% by weight of phosphorus element, 2.8% by weight of aluminum element, and 0.3% by weight of calcium element. When the obtained test piece was subjected to a salt spray test, corrosion was slightly observed compared with the test piece of Example 2. The results are shown in Table 1.
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