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mg-based structural member

A technology for structural components and substrates, applied in metal material coating process, superimposed layer plating, coating, etc., can solve the problems of large anodic oxidation power consumption, etc., achieve waste liquid cost reduction, corrosion inhibition, lighten Effect of Environmental Load

Inactive Publication Date: 2011-12-28
NAT INST FOR MATERIALS SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] There is also a report of a highly corrosion-resistant film formed by anodic oxidation in a solution composed of phosphoric acid as a main component of an element with low environmental load (Patent Document 1), but anodic oxidation has a disadvantage of large power consumption

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0059] In Table 1, for 50mM Ca-EDTA / 50mM KH 2 PO 4 In the solution whose pH was adjusted by adding 0, 1 / 40, 1 / 20 or 3 / 40 1N NaOH solution to the aqueous solution, the pure magnesium whose surface was processed with a 0.1 μm alumina grinding film was used as a base material to be immersed in a 95 ℃ for 8 hours to prepare samples A to D.

[0060] figure 1 The XRD patterns of the treated samples A to D are shown in . In any sample, hydroxyapatite (HAp) and Mg(OH) were observed 2 (Brucite (Brucite) type) peak. As the pH of the treatment solution increased, the peak intensity of HAp increased and the Mg(OH) 2 (Brucite-type Brucite) has a reduced peak strength.

[0061] Electron micrographs of the surfaces and sections of samples B and C are shown in Figure 2-5 middle. In all samples, it was confirmed that the surface was uniformly covered with apatite crystals. Apatite is a plate-shaped or needle-shaped crystal with a diameter of about 1 μm to 10 μm. According to cross-s...

Embodiment 2

[0066] In Table 2, 50mM Ca-EDTA / 50mM KH with pH adjusted by adding 1 / 40 of 1N NaOH 2 PO 4 In the aqueous solution, pure magnesium subjected to the same surface treatment as in Example 1 was dipped as a substrate, and left to stand at 95° C. for 24, 96, and 168 hours to prepare samples E to G. In addition, in Table 2, 50 mM Ca-EDTA / 50 mM KH with pH adjusted by adding 1 / 20 of 1 N NaOH 2 PO 4 In the aqueous solution, pure magnesium subjected to the same surface treatment as in Example 1 was dipped as a substrate, and left to stand at 95° C. for 2, 4, 16, 24, 96, and 168 hours to prepare samples H to M. Figure 6 shows the XRD patterns of samples H and I treated with pH 7.1-7.4 solutions, Figure 7 The XRD pattern of the surface of the samples K-M processed with the solution of pH7.1-7.4 is shown in FIG. The peak of HAp can be observed at any treatment time, and Mg(OH) is also observed in the sample with a long treatment time 2 (brucite) peak. On the other hand, in sample H ...

Embodiment 3

[0073] In Table 3, at 250 mM Ca-EDTA / 250 mM KH 2 PO 4 Add 1 / 40, 1 / 20 or 3 / 40 1N NaOH solution to the aqueous solution and adjust the pH in the aqueous solution, will carry out the pure magnesium that has carried out the same surface processing as Example 1 as a base material, impregnate, static at 95 ℃. Set aside for 8 hours to make samples N to P. The concentrations of phosphate ions and calcium ions in this treatment solution are 5 times that of the solutions used in Example 1 and Example 2.

[0074] Figure 9 The XRD patterns of the processed samples N to P are shown in . The peak of HAp was observed in any sample. The peak intensity of HAp increased as the pH of the treatment solution increased. Mg(OH) 2 The peak of (brucite) was observed in samples O and P, but was not clearly observed in sample N in which the pH of the treatment solution was relatively low. In addition, the Mg(OH) of samples O and P 2 The peak value of is very small compared with samples A to D. ...

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Abstract

Disclosed is an Mg-based structured member, wherein the surface of a base is covered with a film that is mainly composed of apatite crystals. The film and the base can be integrated via a magnesium hydroxide layer. The surface of the film can be coated with a resin coating material, and the film can have a thickness of 1-5 [mu]m. The Mg-based structured member places only a little burden on the environment during the production process thereof.

Description

technical field [0001] The present invention relates to a Mg-based structural member made of magnesium and a magnesium alloy formed into expected structural shapes such as members of transportation equipment such as automobiles, IT equipment such as mobile phones and televisions, and housings of home appliances. More specifically, the present invention relates to the improvement of corrosion resistance of Mg-based structural members. Background technique [0002] Since magnesium alloys have high specific strength and are abundant in resources, they have been researched for applications as lightweight members for improving fuel efficiency of automobiles and aircraft. In addition, since it has higher strength and electromagnetic wave shielding effect than plastics, it is used for casings of IT equipment and home appliances such as mobile phones, personal computers, and televisions. For these members, high corrosion resistance under various environments is required. [0003] ...

Claims

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Application Information

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IPC IPC(8): C23C22/22C23C22/60C23C22/68
CPCC23C22/60C23C22/83C23C28/00C23C30/00C23C28/04C23C22/22C23C22/68
Inventor 广本祥子山本玲子丸山典夫向井敏司染川英俊
Owner NAT INST FOR MATERIALS SCI
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