WO2021075552A1 - 分解性マグネシウム合金 - Google Patents
分解性マグネシウム合金 Download PDFInfo
- Publication number
- WO2021075552A1 WO2021075552A1 PCT/JP2020/039111 JP2020039111W WO2021075552A1 WO 2021075552 A1 WO2021075552 A1 WO 2021075552A1 JP 2020039111 W JP2020039111 W JP 2020039111W WO 2021075552 A1 WO2021075552 A1 WO 2021075552A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- mass
- corrosion rate
- magnesium alloy
- content
- intermetallic compound
- Prior art date
Links
- 229910000861 Mg alloy Inorganic materials 0.000 title claims abstract description 50
- 229910000765 intermetallic Inorganic materials 0.000 claims abstract description 63
- 239000011777 magnesium Substances 0.000 claims abstract description 26
- 239000012535 impurity Substances 0.000 claims abstract description 10
- 229910018134 Al-Mg Inorganic materials 0.000 claims description 38
- 229910018467 Al—Mg Inorganic materials 0.000 claims description 38
- 239000000203 mixture Substances 0.000 claims description 23
- 238000005266 casting Methods 0.000 claims description 19
- 238000009826 distribution Methods 0.000 claims description 7
- 238000000354 decomposition reaction Methods 0.000 claims description 6
- 238000012545 processing Methods 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 abstract description 12
- 229910052782 aluminium Inorganic materials 0.000 abstract description 6
- 229910052748 manganese Inorganic materials 0.000 abstract description 4
- 238000005260 corrosion Methods 0.000 description 82
- 230000007797 corrosion Effects 0.000 description 82
- 239000000463 material Substances 0.000 description 41
- 230000000052 comparative effect Effects 0.000 description 31
- 238000000034 method Methods 0.000 description 11
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 9
- 238000001878 scanning electron micrograph Methods 0.000 description 8
- 238000012360 testing method Methods 0.000 description 8
- 229910052759 nickel Inorganic materials 0.000 description 7
- 239000013078 crystal Substances 0.000 description 6
- 230000007423 decrease Effects 0.000 description 6
- 229910052742 iron Inorganic materials 0.000 description 6
- 229910052751 metal Inorganic materials 0.000 description 6
- 238000005065 mining Methods 0.000 description 6
- 239000002184 metal Substances 0.000 description 5
- 238000003825 pressing Methods 0.000 description 4
- 239000002994 raw material Substances 0.000 description 4
- 150000001875 compounds Chemical class 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000001125 extrusion Methods 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 239000002861 polymer material Substances 0.000 description 3
- 238000005096 rolling process Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 229910052725 zinc Inorganic materials 0.000 description 3
- 241000276420 Lophius piscatorius Species 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- 229910052791 calcium Inorganic materials 0.000 description 2
- 230000008094 contradictory effect Effects 0.000 description 2
- 238000004453 electron probe microanalysis Methods 0.000 description 2
- 238000002149 energy-dispersive X-ray emission spectroscopy Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000010191 image analysis Methods 0.000 description 2
- 229910052738 indium Inorganic materials 0.000 description 2
- 238000012886 linear function Methods 0.000 description 2
- 229910052749 magnesium Inorganic materials 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 229910052709 silver Inorganic materials 0.000 description 2
- 229910001122 Mischmetal Inorganic materials 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052793 cadmium Inorganic materials 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 229920006237 degradable polymer Polymers 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000003292 diminished effect Effects 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 229910052733 gallium Inorganic materials 0.000 description 1
- 238000007429 general method Methods 0.000 description 1
- 229910052745 lead Inorganic materials 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000002343 natural gas well Substances 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 239000003079 shale oil Substances 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 229910052727 yttrium Inorganic materials 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C23/00—Alloys based on magnesium
- C22C23/02—Alloys based on magnesium with aluminium as the next major constituent
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/026—Alloys based on aluminium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C23/00—Alloys based on magnesium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/06—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of magnesium or alloys based thereon
Definitions
- the present invention relates to a degradable magnesium alloy that can be adjusted to any corrosion rate.
- a highly degradable polymer material or magnesium alloy is used as a material used for such a fracturing member.
- Magnesium alloys are particularly suitable when high tensile strength is required. The faster the corrosion rate of the material itself, the higher the productivity of mining. Further, by further improving the mechanical strength of the material, the function can be achieved with a thinner member, and as a result, the time required for decomposition can be shortened, leading to an improvement in mining productivity.
- such a degradable magnesium alloy may be used together with a decomposable polymer material, and degradability and strength suitable for the decomposable polymer material may be required.
- Non-Patent Document 1 mentions that a general corrosion rate for a degradable flak plug is 1000 to 1500 mg / cm 2 / day in a 2% KCl solution.
- Patent Document 1 contains Al of 3.9% by mass or more and 14.0% by mass or less and Mn of 0.1% by mass or more and 0.6% by mass or less, and Ni, Cu, or both.
- a degradable Mg alloy containing 0.01% by mass or more and 10.0% by mass or less and having a balance of Mg and unavoidable impurities is described.
- any one or more of Ni, Fe and Cu are 0.02 to 5% (weight%, the same applies hereinafter) in total, and Al is 0.5 to 3.5%. Described are highly corrosive magnesium alloys for extruded materials, characterized in that they contain 0.2-1.5% Zn and the balance consists of Mg and unavoidable impurities.
- Patent Document 3 Al is 1 to 6%, Zn is 1 to 6%, Fe is 1 to 3%, Cu is 5 to 15%, Ag is 0.1 to 1%, and Ni is described in terms of mass ratio. Corrosive magnesium alloys containing 0.1-1.2% are described.
- Patent Document 4 contains 3.0 to 12% of Al, 0.5 to 5% of Zn, 0.5 to 3% of Cu, and 0.1 to 1.0% of Na in terms of mass ratio. Degradable magnesium alloys are described.
- Patent Document 5 contains 3 to 15% of Al, 0.5 to 5% of Zn, 0 to 5% of Cu, and 0 to 5% of Ni in terms of mass ratio, and Cu and Ni are 0 at the same time. Not degradable magnesium alloys are listed.
- corrosive or degradable magnesium alloys have a metal phase or metal that is noble than Mg in the Mg matrix by adding a metal element such as Cu or Ni that has a higher potential than Mg. It is often designed to form a compound phase containing intermetallic compounds and increase the corrosion rate by microcell corrosion between intermetallic compounds and Mg. Increasing the amount of metal elements with a higher potential than Mg such as Cu and Ni increases the corrosion rate, but if there is a prior technology that discloses the effect of the distribution of intermetallic compounds generated at that time on the corrosion rate. Absent.
- the present invention is a magnesium alloy capable of individually adjusting the corrosion rate and the tensile strength by controlling the amount, size, distribution, etc. of the intermetallic compound, and appropriately adjusting the corrosion rate according to the situation at the site.
- the purpose is to further improve the productivity of mining.
- the present invention comprises 7.0% by mass or more and 13.0% by mass or less of Al, 4.5% by mass or more and 13.0% by mass or less of Cu, and 0% by mass or more and less than 0.10% by mass of Mn.
- the above problem was solved by a magnesium alloy containing a finely dispersed intermetallic compound, the balance of which was composed of Mg and unavoidable impurities.
- the decomposable structural member made of this magnesium alloy can individually adjust the corrosion rate and the tensile strength.
- the addition of Al mainly increases the tensile strength.
- the addition of Cu produces a Cu-Al-Mg-based intermetallic compound having a noble potential, and the potential difference between ⁇ -Mg and the Cu-Al-Mg-based intermetallic compound causes ⁇ -Mg due to microcell corrosion. It is possible to accelerate the depletion of the material, and mainly increase the degradability.
- the magnesium alloy has a problem that when the Cu content is increased, the Cu—Al—Mg-based intermetallic compound increases or becomes coarse, and the tensile strength decreases.
- the Cu—Al—Mg-based compound has a problem. By controlling the amount and distribution of the intermetallic compound and making the size finer to improve the dispersibility, the corrosion rate can be increased without decreasing the tensile strength.
- this intermetallic compound As a method of refining and dispersing this intermetallic compound, it is possible to select to give a large strain to the cast material after casting.
- Specific examples of the processing method for applying this large strain include drawing, extrusion, rolling, pressing, and ECAP (Equal Channel Angler Pressing) processing.
- ECAP Equal Channel Angler Pressing
- the magnesium alloy according to the present invention can adjust the corrosion rate and tensile strength to values assumed to be suitable by adjusting the amount of Al and Cu contained and the size and distribution of the intermetallic compound. it can.
- the decomposable structural member manufactured from the magnesium alloy according to the present invention is used for fracking and can be decomposed at a speed suitable for the site, increasing mining productivity.
- SEM image showing the composition image of the casting material of Example 5 EDS analysis results of intermetallic compounds observed in the bright field of FIG. XRD spectrum of the cast material of Example 5
- SEM image showing the composition image of the processed material of Example 5 SEM image showing the composition image of the casting material of Example 3
- SEM image showing the composition image of the casting material of Comparative Example 1 SEM image showing the composition image of the processed material of Comparative Example 1 EPMA analysis result of hexagonal intermetallic compound of Comparative Example 1
- SEM image showing the composition image of the casting material of Comparative Example 3 SEM image showing the composition image of the processed material of Comparative Example 3
- the present invention is a magnesium alloy capable of rapidly advancing corrosion under a predetermined environment, a decomposable structural member using the magnesium alloy, and a method for adjusting the corrosion rate in the decomposable structural member.
- the Al content of the magnesium alloy according to the present invention needs to be 7.0% by mass or more. If the Al content is too small, the flowability of the molten metal during casting will decrease, and the amount of Cu—Al—Mg-based intermetallic compound will be insufficient, but 7.0% by mass or more is sufficient. The flowability of hot water and the amount of Cu—Al—Mg-based intermetallic compound can be ensured. On the other hand, the Al content needs to be 13.0% by mass or less. If the Al content is too high, the amount of Cu-Al-Mg-based intermetallic compound becomes excessive, and if it exceeds 13.0% by mass, the Cu-Al-Mg-based intermetallic compound hinders the progress of Mg corrosion. This is because the corrosion rate drops sharply.
- the magnesium alloy according to the present invention may contain Mn.
- Mn has the effect of removing some elements contained as impurities, and by containing a small amount of Mn, it suppresses the influence of other elements on the corrosion rate to be adjusted, and is a degradability produced by a magnesium alloy.
- the accuracy of adjusting the corrosion rate of structural members can be improved.
- the Mn content needs to be less than 0.10% by mass. This is because when the Mn content increases, the Cu-Al-Mg-based intermetallic compound contains Mn, and the Cu-Al-Mg-based intermetallic compound tends to become coarse. If the Cu—Al—Mg-based intermetallic compound becomes coarse, the corrosion rate will decrease.
- the Cu content of the magnesium alloy according to the present invention needs to be 4.5% by mass or more.
- a Cu—Al—Mg-based intermetallic compound having a noble potential is produced in the structural member obtained by casting the magnesium alloy according to the present invention. Due to the potential difference between ⁇ -Mg and the Cu-Al-Mg-based intermetallic compound, the depletion of ⁇ -Mg due to microcell corrosion is promoted, and the corrosion rate can be improved. In a normal Mg alloy, the corrosion rate tends to decrease when the above Al is contained, but if the Cu content is 4.5% by mass or more, even within the above Al content range, The degradable structural member can achieve a practical corrosion rate.
- the Cu content is preferably 7.0% by mass or more.
- the Cu content When the Cu content was 7.0% by mass or more, the amount of the Cu—Al—Mg-based intermetallic compound increased, and the degradable structural member obtained by casting this magnesium alloy was strained. Occasionally, it is considered that the Cu—Al—Mg-based intermetallic compound is likely to be crushed, and the Cu—Al—Mg-based intermetallic compound phase is made finer to facilitate the improvement of the corrosion rate.
- the Cu content needs to be 13.0% by mass or less. If the Cu content exceeds 13.0% by mass, coarse block-shaped Cu-Al-Mg-based intermetallic compounds are generated during casting, hindering the progress of Mg corrosion, and microcell corrosion caused by the addition of Cu. The effect of improving the corrosion rate is diminished.
- the magnesium alloy according to the present invention may contain elements other than the above elements as unavoidable impurities.
- This unavoidable impurity is unavoidably contained unintentionally due to a manufacturing problem or a raw material problem.
- elements such as Ag, Fe, Ca, Cd, Ga, In, Li, Mm (mischmetal), Ni, Pb, Se, Si, Ti, Y, Zn, and Zr can be mentioned.
- the content needs to be in a range that does not impair the characteristics of the magnesium alloy according to the present invention, and is preferably less than 0.2% by mass and more preferably less than 0.1% by mass per element.
- the contents of Si, Li, In, and Ca are preferably less than 0.1% by mass, more preferably less than 0.05% by mass.
- the decomposable structural member produced from the magnesium alloy according to the present invention is made of Mg except for the above-mentioned Al, Mn, Cu and unavoidable impurities, and is processed so as to have a finely dispersed intermetallic compound.
- the magnesium alloy according to the present invention can be prepared by a general method using a raw material containing the above elements so as to have a composition ratio in the above mass% range and a desirable decomposition rate. is there.
- the above mass% is not% in the raw material, but% in the prepared alloy and the decomposable structural member produced by casting or sintering the alloy.
- a suitable decomposable structural member according to the present invention can be obtained by casting.
- “suitable” means that the corrosion rate and tensile strength are adjusted to be suitable at the site of fracking, and the mining productivity is improved.
- the Cu—Al—Mg-based intermetallic compound can be finely dispersed, and the corrosion rate and mechanical properties can be improved.
- the average equivalent diameter d of the Cu—Al—Mg-based intermetallic compound can be reduced.
- the average equivalent diameter d is preferably 10 ⁇ m or less, more preferably 5 ⁇ m or less, and even more preferably 2 ⁇ m or less.
- Examples of the method of applying strain include drawing, extrusion, rolling, pressing, and ECAP (Equal Channel Angler Pressing) processing on the member obtained by casting. These methods may be appropriately selected depending on the shape of the member to be obtained.
- the crystal size of ⁇ -Mg becomes 100 to 200 ⁇ m in terms of average crystal grain size D, but when the crystal size is reduced to about 5 ⁇ m or more and 25 ⁇ m or less by the above extrusion, rolling, drawing, etc. preferable.
- the corrosion rate of the decomposable structural member according to the present invention can be adjusted by the Cu content "CU” and the Al content "AL". It was found that the tendency can be adjusted according to the square of "CU” and the square of "1 / AL”. It can also be adjusted by the average equivalent diameter d of the Cu—Al—Mg-based intermetallic compound.
- the relationship of the following equation (1) holds for these values and the constant p.
- Pc is a parameter that is a linear function of the following equation (2) with respect to the corrosion rate W Est (a 1 and b 1 are constants that differ for each system). Therefore, the corrosion rate W Est can also be adjusted by adjusting the average equivalent diameter d.
- the tensile strength of the decomposable structural member according to the present invention can be adjusted according to the first power of "AL” and the first power of "CU". It was also found that the adjustment is possible according to the square root of the average equivalent diameter d described above.
- the relationship of the following equation (3) holds for these values and the constants u and v.
- Ps is a parameter that is a linear function of the following equation (4) with respect to the estimated tensile strengths ⁇ T and Est (a 2 and b 2 are constants that differ for each system). Therefore, the tensile strengths ⁇ T and Est can be adjusted by adjusting the average equivalent diameter d.
- a degradable structural member made of magnesium alloy having an arbitrary tensile strength and corrosion rate can be prepared from the Al content, Cu content and average equivalent diameter d. .. Further, from these equations, it can be seen that in the magnesium alloy according to the present invention, the corrosion rate and the tensile strength are not necessarily contradictory. Therefore, in the above range of Al, Cu, and Mn contents, the Al content, Cu content, and Cu—Al—Mg-based metal are based on the relationship between these parameters Pc and Ps and the corrosion rate and tensile strength. By adjusting the average equivalent diameter d of the inter-compound, the corrosion rate and tensile strength of the highly degradable magnesium alloy can be individually controlled.
- Examples of products to which the degradable structural member made of magnesium alloy according to the present invention is applied include drilling tools such as oil wells and natural gas wells. Since it is introduced deep into the ground and exposed to high water pressure, it needs to be strong enough to withstand a high-pressure environment. On the other hand, when it is no longer needed, it can be excluded by being corroded and decomposed at an appropriate timing by being exposed to the aqueous solution introduced in the excavation work without taking the trouble of taking it out from deep underground.
- the magnesium alloy according to this invention was actually prepared and the members were manufactured. The procedure and test method will be described.
- Example preparation> A magnesium alloy was adjusted so that the content of elements other than Mg was the mass% shown in each of Table 1 below, heated to 700 ° C., and cast into an iron mold to prepare a cast material. Next, by applying an external force to the cast material heated to about 370 ° C., a strain of 560% was applied to prepare a processed material. By this processing, the cross-sectional area of the processed material was reduced to 1/32 of that of the cast material.
- FIG. 1 is a composition image obtained by SEM observation of the casting material of Example 5.
- FIG. 2 shows the EDS analysis result of the intermetallic compound observed in the bright field of FIG.
- FIG. 3 is an XRD result of the cast material of Example 5. From these results, it can be seen that the cast material is composed of ⁇ -Mg, a Cu-Al-Mg-based intermetallic compound, and Mg 17 Al 12.
- FIG. 4 is a composition image obtained by SEM observation of the processed material of Example 5. It can be seen that the Cu—Al—Mg-based intermetallic compound is divided and crushed by processing and finely dispersed.
- the casting material contains ⁇ -Mg, Cu-Al-Mg-based intermetallic compound, Mg 17 Al 12 ", (2) "Cu-Al-Mg-based intermetallic compound by processing” Is crushed "is the same in other examples and comparative examples.
- the average equivalent diameter d of the Cu-Al-Mg-based intermetallic compound in Table 1 is measured by discriminating the bright field portion by image analysis of the composition image acquired by SEM observation of the processed material, and is the arithmetic mean thereof. This is the result of calculating the average equivalent diameter d ( ⁇ m) of the Cu—Al—Mg-based intermetallic compound. Further, the average grain boundary D of ⁇ -Mg is measured by discriminating the grain boundaries by image analysis of an image acquired by observation with an optical microscope after intergranular corrosion of the processed material, and is the arithmetic average thereof. This is the result of measuring the average crystal grain size D of ⁇ -Mg.
- the arithmetic mean which is the average equivalent diameter d and the average crystal grain size D, is a value obtained by dividing the total measured particle size by the measured number of particles.
- the sizes of Cu—Al—Mg-based intermetallic compounds are various, but the crystal grain size is not so different.
- Example 5 and 6 are composition images obtained by SEM observation of the cast materials of Examples 3 and 1.
- the shape of Example 3 having a low Cu content is entirely mesh-like, whereas the shape of Example 1 having a high Cu content is loose.
- the intermetallic compound is hard to be crushed, while when the Cu content is 7.0% by mass or more, it becomes a loose Cu-Al-Mg-based intermetallic compound, so that stress concentration occurs when strain is applied. It is considered that it is easy to show that the Cu—Al—Mg-based intermetallic compound is crushed and refined even with a relatively small applied strain, and the dispersibility tends to be high.
- FIG. 7 and 8 are composition images obtained by SEM observation of the cast material and the processed material of Comparative Example 1. Since the hexagonal intermetallic compound observed in these figures has a small aspect ratio, it can be seen that the hexagonal intermetallic compound is not crushed even when strain is applied (see the arrow in the figure). Further, FIG. 9 shows the EPMA analysis result of the hexagonal intermetallic compound, and shows that the hexagonal intermetallic compound is an intermetallic compound composed of Mg, Al, Cu, and Mn. This also applies to Comparative Example 2. Such intermetallic compounds are slightly observed in Comparative Examples 6 and 10, but are not observed in the other Examples and Comparative Examples. This indicates that the addition of Mn is a factor in the formation of coarse intermetallic compounds.
- 10 and 11 are composition images obtained by SEM observation of the cast material and processed material of Comparative Example 3 in which the Cu content exceeds 13.0% by mass. A coarse block-shaped intermetallic compound is observed, and since this coarse intermetallic compound has a small aspect ratio, it is not crushed even if strain is applied. This is the same in Comparative Example 4, and is slightly observed in Comparative Example 7. This indicates that when the Cu content exceeds 13.0% by mass, Cu is mainly spent on producing coarse block-shaped intermetallic compounds having a small aspect ratio.
- Example 11 Example 13, and Comparative Example 10
- the contents of Al and Cu and the average equivalent diameter d of the intermetallic compound are the same, and the contents of Mn are 0.032% by mass and 0.077, respectively. It differs from% by mass and 0.10% by mass.
- the corrosion rates of Examples 11 and 13 are the same at 2616 mcd and 2977 mcd, but the corrosion rates of Comparative Example 10 are as small as 2259 mcd. It is shown that the corrosion rate decreases when the Mn content is 0.10% by mass or more.
- the corrosion rates of the processed materials of Examples 1 to 10 correspond to the average of Al content AL (mass%), Cu content CU (mass%), and Cu—Al—Mg-based intermetallic compound.
- the parameter Pc represented by the diameter d ( ⁇ m) can be arranged in a linear relationship as shown in the above equation (1).
- the Al content is preferably 7.0% by mass or more.
- the corrosion rate is 1362 mcd. Since this corrosion rate is equivalent to the decomposition rate of 1000 to 1500 mcd, which is a general decomposition rate for degradable flak plugs, the Cu content is 4.5 in order to obtain a practical corrosion rate as a highly decomposable magnesium alloy. It can be said that the mass% or more is preferable.
- the data of the comparative example is also shown in FIG. 12, and the corrosion rate of the comparative example is lower than the linear relationship obtained from the examples, and the corrosion rate is lowered due to the above-mentioned metallographic characteristics. Is also shown.
- Table 4 shows the values obtained by dividing the corrosion rate in Table 3 by the W Est of the above formula (5). In Examples 1 to 14, this value is 0.90 to 1.10, whereas in Comparative Examples 1 to 7, this value is 0.81 or less, and the corrosion rate of Comparative Example is the above formula (5). ) Is clearly shown to be lower than the estimated corrosion rate.
- FIG. 13 is a graph showing the processed materials of Examples 1 to 14 and Comparative Examples 1, 2, 6 and 10 with the Mn content on the horizontal axis and the values in Table 4 on the vertical axis. It can be seen that in the comparative example in which the Mn content is 0.10% by mass or more, the corrosion rate is lower than the estimated corrosion rate obtained from the above formula (5).
- FIG. 14 is a graph showing the processed materials of Examples 1 to 14 and Comparative Examples 3, 4 and 7 with the Cu content on the horizontal axis and the values in Table 4 on the vertical axis. It can be seen that in the comparative example in which the Cu content exceeds 13.0% by mass, the corrosion rate is lower than the estimated corrosion rate obtained from the above formula (5).
- the tensile strengths of the processed materials of Examples 1 to 14 are Al content AL (mass%), Cu content CU (mass%), and Cu—Al—Mg-based intermetallic compound. It can be arranged in a linear relationship as shown in the above equation (3) by the parameter Ps represented by the average equivalent diameter d ( ⁇ m) of.
- the average equivalent diameter d of the intermetallic compound when the average equivalent diameter d of the intermetallic compound can be controlled to 0.5 ⁇ m or more and less than 2 ⁇ m, in order to adjust the corrosion rate to 1500 mcd or more, Cu is contained. It is preferable to prepare the amount in the range of more than 12.0% by mass and 13.0% by mass or less. Further, when the average equivalent diameter d can only be 2 ⁇ m or more and 4 ⁇ m or less due to manufacturing convenience or the shape of the member, in order to make the corrosion rate 1500 mcd or more, the Al content is 10.0% by mass or more 11 It is preferable to prepare the mixture in a range of 0.0% by mass or less and a Cu content of more than 10.0% by mass and 13.0% by mass or less.
- the average equivalent diameter d can be controlled to 0.8 ⁇ m or more and 1.2 ⁇ m or less, a degradable magnesium alloy having a target corrosion rate within a range of a tensile strength of 300 MPa or more and a corrosion rate of 2000 mcd or more and less than 5500 mcd or
- the Al content is 7.0% by mass or more and 13.0% by mass or less
- the Cu content is 12 from the above formulas (1), (3), (5) and (6). It is preferable to prepare the chemical composition in the range of 5.5% by mass or more and 13.0% by mass or less.
- the Al content is 7 It is preferable to prepare the chemical composition in the range of 7% by mass or more and 10.8% by mass or less and the Cu content in the range of 12.5% by mass or more and 13.0% by mass or less.
- the average equivalent diameter d can be controlled to 0.8 ⁇ m or more and 1.2 ⁇ m or less
- the chemical composition is prepared in the range of Al content of 9.0% by mass or more and 13.0% by mass or less and Cu content of 9.0% by mass or more and 13.0% by mass or less. It is preferable to do so.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Forging (AREA)
- Continuous Casting (AREA)
- Extrusion Of Metal (AREA)
Abstract
Description
この発明は、所定の環境下で高速に腐食を進行させることができるマグネシウム合金及びこれを用いた分解性構造部材、そしてその分解性構造部材における腐食速度の調整方法である。
WEst=a1×Pc+b1 (2)
σT,Est=a2×Ps+b2 (4)
Mg以外の元素の含有成分が下記の表1のそれぞれに記載の質量%となるようにマグネシウム合金を調整して700℃に加熱し鉄製金型に鋳込んで鋳造材を作製した。次に、約370℃に加熱した鋳造材に外力を加えることで、560%のひずみを与えて加工材を作製した。この加工により、加工材の断面積は鋳造材の1/32に減少した。
それぞれの原料を調整して700℃に加熱し、表2に示す組成で厚さ5mm、幅35mm、長さ235mmの直方体鋳物を作製できる鉄製金型に注湯した。なお、鉄製金型は長尺の端部が解放されており、反対側の端部には空気穴が設けられていて、注湯は解放部から行った。得られた鋳造試験体の長さは表2に示すようになり、十分な鋳造性を得るためにはAlの含有量が7.0質量%以上であることが望ましいことがわかった。
それぞれの実施例及び比較例にかかる加工材を2%KCl水溶液(93℃)中に浸漬し、試験体の試験前後の質量(mg)及び表面積を測定して一日あたりの腐食速度(mg/cm2/day:mcd)を算出した。また、これらの加工材から、JISZ2241(ISO6892)に準拠して引張試験を行った。これらの試験結果を表3に示す。ここで、比較例5は腐食試験後に表面が白色を呈していたのに対し、他の実施例および比較例は腐食試験後に表面が灰色を呈していた。また、比較例5は他の実施例と比べて極端に腐食速度が小さかった。これは、Alの含有量が多すぎて安定な腐食生成物が生成し付着したためと考えられる。よって、Alの含有量は13.0%質量以下であることが望ましい。
Claims (4)
- 7.0質量%以上13.0質量%以下のAlと、4.5質量%以上13.0質量%以下のCuと、0質量%以上0.10質量%未満のMnと、残部がMgと不可避不純物からなり、微細分散された金属間化合物を有するマグネシウム合金。
- 請求項1に記載のマグネシウム合金からなる分解性構造部材。
- 請求項1に記載の組成比であるマグネシウム合金を鋳造した後に、加工によりCu-Al-Mg系金属間化合物を微細化及び分散化する工程を備える分解性構造部材の製造方法。
- 請求項1に記載の組成比であるマグネシウム合金または請求項2に記載の分解性構造部材において、Cu-Al-Mg系金属間化合物のサイズと分布を調整することにより、分解速度と機械的性質のいずれかまたは両方を調整する方法。
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2021552468A JPWO2021075552A1 (ja) | 2019-10-18 | 2020-10-16 | |
CN202080068567.6A CN114502758B (zh) | 2019-10-18 | 2020-10-16 | 可降解性镁合金 |
EP20877482.8A EP4047106A4 (en) | 2019-10-18 | 2020-10-16 | DEGRADABLE MAGNESIUM ALLOY |
AU2020367416A AU2020367416A1 (en) | 2019-10-18 | 2020-10-16 | Degradable magnesium alloy |
US17/769,126 US20240110269A1 (en) | 2019-10-18 | 2020-10-16 | Degradable magnesium alloy |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2019041166 | 2019-10-18 | ||
JPPCT/JP2019/041166 | 2019-10-18 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2021075552A1 true WO2021075552A1 (ja) | 2021-04-22 |
Family
ID=75538290
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2020/039111 WO2021075552A1 (ja) | 2019-10-18 | 2020-10-16 | 分解性マグネシウム合金 |
Country Status (6)
Country | Link |
---|---|
US (1) | US20240110269A1 (ja) |
EP (1) | EP4047106A4 (ja) |
JP (1) | JPWO2021075552A1 (ja) |
CN (1) | CN114502758B (ja) |
AU (1) | AU2020367416A1 (ja) |
WO (1) | WO2021075552A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN114086045A (zh) * | 2021-10-11 | 2022-02-25 | 北京理工大学 | 一种降解速率可控的医用镁银合金的制备方法 |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN115466890B (zh) * | 2022-09-19 | 2023-12-01 | 重庆科技学院 | 一种可快速降解的高强韧含Cu镁合金材料及其制备方法 |
Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH02232332A (ja) | 1989-03-07 | 1990-09-14 | Tech Res & Dev Inst Of Japan Def Agency | 高腐食性マグネシウム合金 |
JP2005054233A (ja) * | 2003-08-04 | 2005-03-03 | Chiba Inst Of Technology | 耐熱マグネシウム合金 |
JP2007284743A (ja) * | 2006-04-17 | 2007-11-01 | Tetsuichi Mogi | Mg合金 |
WO2008072435A1 (ja) * | 2006-12-11 | 2008-06-19 | Kabushiki Kaisha Toyota Jidoshokki | 鋳造用マグネシウム合金およびマグネシウム合金鋳物の製造方法 |
CN104498792A (zh) | 2014-12-24 | 2015-04-08 | 青海柴达木青元泛镁科技有限公司 | 一种快速腐蚀镁合金产品及其制备方法 |
US20160201435A1 (en) * | 2014-08-28 | 2016-07-14 | Halliburton Energy Services, Inc. | Fresh water degradable downhole tools comprising magnesium and aluminum alloys |
WO2017168696A1 (ja) | 2016-03-31 | 2017-10-05 | 株式会社栗本鐵工所 | 分解性Mg合金 |
CN107523732A (zh) | 2017-08-15 | 2017-12-29 | 太原科技大学 | 一种含Na快速降解镁合金及其制备方法 |
CN107587019A (zh) | 2017-08-15 | 2018-01-16 | 太原科技大学 | 一种石油开采用憋压球的高强快速分解镁合金及制备方法 |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPWO2010047045A1 (ja) * | 2008-10-22 | 2012-03-15 | 住友電気工業株式会社 | マグネシウム合金成形体及びマグネシウム合金板 |
CN103397235B (zh) * | 2013-08-16 | 2015-08-12 | 重庆大学 | 一种镁-铝-锌-锰-铜合金及其制备方法 |
US9789663B2 (en) * | 2014-01-09 | 2017-10-17 | Baker Hughes Incorporated | Degradable metal composites, methods of manufacture, and uses thereof |
US11167343B2 (en) * | 2014-02-21 | 2021-11-09 | Terves, Llc | Galvanically-active in situ formed particles for controlled rate dissolving tools |
GB201413327D0 (en) * | 2014-07-28 | 2014-09-10 | Magnesium Elektron Ltd | Corrodible downhole article |
-
2020
- 2020-10-16 CN CN202080068567.6A patent/CN114502758B/zh active Active
- 2020-10-16 JP JP2021552468A patent/JPWO2021075552A1/ja active Pending
- 2020-10-16 AU AU2020367416A patent/AU2020367416A1/en active Pending
- 2020-10-16 EP EP20877482.8A patent/EP4047106A4/en active Pending
- 2020-10-16 WO PCT/JP2020/039111 patent/WO2021075552A1/ja active Application Filing
- 2020-10-16 US US17/769,126 patent/US20240110269A1/en active Pending
Patent Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH02232332A (ja) | 1989-03-07 | 1990-09-14 | Tech Res & Dev Inst Of Japan Def Agency | 高腐食性マグネシウム合金 |
JP2005054233A (ja) * | 2003-08-04 | 2005-03-03 | Chiba Inst Of Technology | 耐熱マグネシウム合金 |
JP2007284743A (ja) * | 2006-04-17 | 2007-11-01 | Tetsuichi Mogi | Mg合金 |
WO2008072435A1 (ja) * | 2006-12-11 | 2008-06-19 | Kabushiki Kaisha Toyota Jidoshokki | 鋳造用マグネシウム合金およびマグネシウム合金鋳物の製造方法 |
US20160201435A1 (en) * | 2014-08-28 | 2016-07-14 | Halliburton Energy Services, Inc. | Fresh water degradable downhole tools comprising magnesium and aluminum alloys |
CN104498792A (zh) | 2014-12-24 | 2015-04-08 | 青海柴达木青元泛镁科技有限公司 | 一种快速腐蚀镁合金产品及其制备方法 |
WO2017168696A1 (ja) | 2016-03-31 | 2017-10-05 | 株式会社栗本鐵工所 | 分解性Mg合金 |
CN107523732A (zh) | 2017-08-15 | 2017-12-29 | 太原科技大学 | 一种含Na快速降解镁合金及其制备方法 |
CN107587019A (zh) | 2017-08-15 | 2018-01-16 | 太原科技大学 | 一种石油开采用憋压球的高强快速分解镁合金及制备方法 |
Non-Patent Citations (2)
Title |
---|
S. TAKAHASHI ET AL.: "Degradation Study on Materials for Dissolvable FracPlugs", UNCONVENTIONAL RESOURCES TECHNOLOGY CONFERENCE (URTEC |
See also references of EP4047106A4 |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN114086045A (zh) * | 2021-10-11 | 2022-02-25 | 北京理工大学 | 一种降解速率可控的医用镁银合金的制备方法 |
Also Published As
Publication number | Publication date |
---|---|
US20240110269A1 (en) | 2024-04-04 |
EP4047106A1 (en) | 2022-08-24 |
CN114502758A (zh) | 2022-05-13 |
CN114502758B (zh) | 2023-01-10 |
EP4047106A4 (en) | 2023-01-11 |
JPWO2021075552A1 (ja) | 2021-04-22 |
AU2020367416A1 (en) | 2022-05-05 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
Yang et al. | The effects of fine WC contents and temperature on the microstructure and mechanical properties of inhomogeneous WC-(fine WC-Co) cemented carbides | |
Geng et al. | Microstructure, mechanical properties, and corrosion behavior of degradable Mg-Al-Cu-Zn-Gd alloys | |
Joo et al. | Tensile deformation behavior and deformation twinning of an equimolar CoCrFeMnNi high-entropy alloy | |
WO2021075552A1 (ja) | 分解性マグネシウム合金 | |
Wang et al. | Effects of rare earth yttrium on microstructure and properties of MgAlZn alloy | |
Qiu et al. | Synergistic effect of Sr and La on the microstructure and mechanical properties of A356. 2 alloy | |
KR20170038804A (ko) | 부식성 다운홀 물품 | |
RU2756521C2 (ru) | Подверженное коррозии скважинное изделие | |
Mousavi et al. | The effect of mischmetal and heat treatment on the microstructure and tensile properties of A357 Al–Si casting alloy | |
KR102542754B1 (ko) | 분해성 Mg 합금 | |
Zhang et al. | Microstructure and mechanical properties of as-cast and extruded Mg–8Li–3Al–2Zn–0.5 Nd alloy | |
EP2725109A2 (en) | Alloy material in which are dispersed oxygen atoms and a metal element of oxide-particles, and production method for same | |
CN112708813B (zh) | 一种油气开采工具用可溶镁合金材料及其制备方法 | |
Fang et al. | Study on improving “self-sharpening” capacity of W–Cu–Zn alloy by the pressureless infiltration method | |
Liu et al. | Investigation of rapidly decomposable AZ91–RE–xCu (x= 0, 1, 2, 3, 4) alloys for petroleum fracturing balls | |
Singh et al. | Tensile and compression behaviour, microstructural characterization on Mg-3Zn-3Sn-0.7 Mn alloy reinforced with SiCp prepared through powder metallurgy method | |
CN114318040B (zh) | 一种添加稀土硬质合金及其制备方法 | |
US11047026B2 (en) | Cemented carbide material | |
Hagihara et al. | Strain-rate dependence of deformation behavior of LPSO-phases | |
Jiang et al. | Effect of nano-TiO2 addition on the microstructure and erosion-corrosion behavior of Ti (C, N)-based cermets fabricated by in-situ carbothermal reduction | |
Sheikhani et al. | The effect of Ce addition (up to 3%) and extrusion ratio on the microstructure and tensile properties of ZK60 Mg alloy | |
Li et al. | Effect of iron addition on the microstructures and properties of hypereutectic Al-20% Si alloys | |
Yousefi et al. | Microstructure and impression creep characteristics Al-9Si-xCu aluminum alloys | |
Xu et al. | Effect of Nd on microstructure and mechanical properties of dual-phase Mg-9Li-3Al alloys | |
JP6774787B2 (ja) | マグネシウム合金の製造方法 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 20877482 Country of ref document: EP Kind code of ref document: A1 |
|
ENP | Entry into the national phase |
Ref document number: 2021552468 Country of ref document: JP Kind code of ref document: A |
|
WWE | Wipo information: entry into national phase |
Ref document number: 17769126 Country of ref document: US |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
ENP | Entry into the national phase |
Ref document number: 2020367416 Country of ref document: AU Date of ref document: 20201016 Kind code of ref document: A |
|
ENP | Entry into the national phase |
Ref document number: 2020877482 Country of ref document: EP Effective date: 20220518 |