WO2011030870A1 - マグネシウム-リチウム合金およびその表面処理方法 - Google Patents
マグネシウム-リチウム合金およびその表面処理方法 Download PDFInfo
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- WO2011030870A1 WO2011030870A1 PCT/JP2010/065656 JP2010065656W WO2011030870A1 WO 2011030870 A1 WO2011030870 A1 WO 2011030870A1 JP 2010065656 W JP2010065656 W JP 2010065656W WO 2011030870 A1 WO2011030870 A1 WO 2011030870A1
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- Prior art keywords
- magnesium
- lithium alloy
- treatment
- lithium
- film
- Prior art date
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Classifications
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/78—Pretreatment of the material to be coated
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- 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
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
- C23C22/06—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
- C23C22/34—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing fluorides or complex fluorides
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/12—Light metals
Definitions
- the present invention relates to a surface treatment method for a magnesium-lithium alloy. More specifically, the present invention relates to a magnesium-lithium alloy surface treatment method capable of forming a surface having a low surface electrical resistance value and excellent corrosion resistance.
- Magnesium alloy has excellent physical strength, light weight, recyclability, electromagnetic wave shielding, heat dissipation, dimensional stability, and the like. Furthermore, since it has good castability and workability and is lightweight, it is used in various fields as a substitute for aluminum and plastic.
- general-purpose products are generally AZ91 materials, and structural materials are generally AM60 materials.
- a magnesium-lithium alloy containing lithium has been conventionally used as a material that can be further reduced in weight than the above-mentioned magnesium alloy, and has dramatically improved extensibility, and can be pressed at room temperature like iron and aluminum. The use of is being considered.
- this magnesium-lithium alloy has a lower corrosion resistance than a general magnesium alloy and cannot be put into practical use as it is, a method for producing a magnesium-lithium alloy with improved corrosion resistance (see Patent Documents 1 to 4). And a surface treatment method of a magnesium-lithium alloy for improving corrosion resistance (see Patent Document 5).
- Patent Document 1 discloses that a magnesium-lithium alloy containing 10.5% by mass or less of lithium and having an iron impurity concentration of 50 ppm or less has excellent corrosion resistance.
- Patent Document 2 discloses that a magnesium-lithium alloy containing 6 to 10.5% by mass of lithium and 4 to 9% by mass of zinc is excellent in strength and corrosion resistance at room temperature.
- Patent Document 3 discloses a cold-pressable magnesium-lithium alloy containing 6 to 16% by mass of lithium.
- Patent Document 4 describes that a magnesium-lithium alloy containing 10.5 to 40% by mass of lithium and having an average crystal grain size of 3 to 30 ⁇ m is excellent in strength and press workability.
- Patent Document 5 discloses a surface treatment method in which a magnesium-lithium alloy is immersed in a treatment liquid containing fluorine and aluminum.
- JP 2000-282165 A Japanese Patent Laid-Open No. 2001-40445 Japanese Patent Laid-Open No. 9-41066 JP 11-279675 A Japanese Patent No. 4112219
- Electronic equipment casing parts are required to have a surface electrical resistance value of 1 ⁇ or less according to the standards of each electric manufacturer in order to provide electromagnetic shielding properties and ground from the substrate.
- the present invention has been made in view of such circumstances, and includes a method of forming a film having a low surface electrical resistance value and excellent coating base performance and bare corrosion resistance, and a magnesium-lithium alloy obtained thereby. It is intended to provide.
- the surface treatment method of a magnesium-lithium alloy of the present invention comprises treating the surface of a magnesium-lithium alloy with a treatment liquid of an inorganic acid containing metal ions of aluminum and zinc, thereby increasing the surface electrical resistance value. Has a step of reducing the resistance to 1 ⁇ or less.
- the magnesium-lithium alloy surface treatment method further includes a step of performing film conversion treatment by adjusting the surface and then immersing in a treatment liquid containing a fluorine compound.
- magnesium-lithium alloy of the present invention for solving the above-mentioned problems is obtained by the above surface treatment method.
- magnesium-lithium alloy to be treated in the present invention various magnesium alloys containing lithium suitable for cold pressing can be used.
- various magnesium-lithium alloys disclosed in prior art documents can be used.
- the size and shape of the magnesium-lithium alloy are not particularly limited.
- Preferable magnesium-lithium alloys include those containing 10.5 to 20% by mass of lithium, more preferably 10.5 to 16% by mass, with the balance being magnesium and impurities.
- this magnesium-lithium alloy is used after removing the surface oxide layer and the segregation layer through a degreasing step, a water washing step, etc., as necessary, as is also done in normal chemical conversion treatment.
- the degreasing step can be performed by a method such as immersing in a highly alkaline solution such as sodium hydroxide.
- a highly alkaline solution such as sodium hydroxide.
- sodium hydroxide When sodium hydroxide is used, it is preferably prepared as a highly alkaline solution having a concentration of 1 to 20% by mass.
- the immersion time in the highly alkaline solution is preferably 1 to 10 minutes. If the concentration of the sodium hydroxide aqueous solution is less than 1% by mass or the immersion time is less than 1 minute, poor appearance may occur due to insufficient degreasing. Moreover, when a sodium hydroxide aqueous solution having a concentration higher than 20% by mass is used, white powder due to residual alkali may be generated.
- FAL free alkalinity
- the treatment step with the low electrical resistance treatment liquid is performed by using one or two or more mixed acids selected from inorganic acids (phosphoric acid, nitric acid, sulfuric acid, hydrochloric acid, hydrofluoric acid, etc.) and two metal ions ( This is performed by immersing the magnesium-lithium alloy in a low electrical resistance treatment solution comprising an aqueous solution to which aluminum and zinc are added.
- a magnesium-lithium alloy having a low surface electrical resistance value which has not been obtained conventionally, can be obtained.
- the surface electrical resistance value cannot be lowered only by adding one kind of metal of aluminum and zinc alone, and an effect can be obtained only by adding both elements.
- the supply source of aluminum is supplied by a water-soluble aluminum salt such as aluminum nitrate, aluminum sulfate, or primary aluminum phosphate.
- the aluminum content in the treatment liquid is preferably 0.021 to 0.47 g / l, more preferably 0.085 to 0.34 g / l. By setting it as 0.021 g / l or more and 0.47 g / l or less, it becomes easy to make a surface electrical resistance value low.
- the zinc content in the treatment liquid is preferably 0.0004 to 0.029 g / l, more preferably 0.0012 to 0.013 g / l. If it is 0.0004 g / l or more, it becomes easy to lower the surface electric resistance value, and if it is 0.029 g / l or less, it becomes easy to lower the surface electric resistance value, and the corrosion resistance of the film is also improved. To do.
- the inorganic acid concentration is adjusted so that the free acidity (FA) is in the range of 9.0 to 12.0 points. If it is less than 9.0 points, care must be taken not to cause insufficient processing, poor appearance, increase in surface electrical resistance, decrease in coating adhesion, etc. If it exceeds 12.0 points, excessive treatment is required. Care must be taken not to cause rough skin, poor dimensionality, or poor corrosion resistance due to coating.
- FA free acidity
- the immersion with the low electrical resistance treatment solution is preferably performed at a temperature of 35 to 70 ° C., preferably 55 to 65 ° C. If it is lower than 35 ° C, it is necessary to be careful not to cause insufficient processing, poor appearance, increase in surface electrical resistance value, decrease in coating film adhesion, etc. If it exceeds 70 ° C, rough skin due to excessive processing, poor dimensionality. Care must be taken not to cause a decrease in film corrosion resistance.
- the immersion time is 0.5 to 2 minutes, more preferably 1 minute. If it is less than 0.5 minutes, the treatment may be insufficient, the surface electrical resistance value may be increased, the coating film adhesion may be decreased, and if it exceeds 2 minutes, the film corrosion resistance may be decreased.
- alkaline Surface adjustment treatment is performed with an aqueous solution.
- the surface conditioning treatment with this alkaline aqueous solution can be performed by a method such as immersing in a highly alkaline solution such as sodium hydroxide as in the degreasing step.
- sodium hydroxide it is preferably prepared as a highly alkaline solution having a concentration of 5 to 30% by mass.
- the immersion time in the highly alkaline solution is preferably 0.5 to 10 minutes.
- the immersion temperature is 45 to 70 ° C.
- the concentration of the aqueous sodium hydroxide solution is less than 5% by mass, the immersion time is less than 0.5 minutes, or the temperature is less than 45 ° C, be careful not to leave smut and reduce the corrosion resistance of the film. There is a need to.
- concentration higher than 30 mass% it is necessary to be careful so that the white powder resulting from an alkali residue may not generate
- FAL free alkalinity
- a film chemical conversion treatment step is performed with a film chemical conversion treatment solution containing fluoride. This process enhances the corrosion resistance.
- the film chemical conversion treatment step is obtained by immersing in a film chemical conversion liquid containing fluorine.
- Fluorine in this film chemical conversion treatment liquid includes hydrofluoric acid, sodium fluoride, hydrofluoric acid, acidic sodium fluoride, acidic potassium fluoride, acidic ammonium fluoride, hydrofluoric acid and its salt, and borofluoride. It is preferably supplied from at least one selected from acids and salts thereof. This is because these compounds can be obtained as a material in which fluorine is sufficiently dissolved in an active state.
- the fluorine content in the film chemical conversion treatment liquid is preferably in the range of 3.33 to 40 g / l. More preferably, it is 8.0 to 30.0 g / l.
- the fluorine content is less than 3.33 g / l, care must be taken not to cause insufficient film adhesion or decrease in film corrosion resistance.
- the fluorine content exceeds 40 g / l, the surface electrical resistance value Care must be taken not to cause a rise or a decrease in coating film adhesion.
- the acid concentration in the film chemical conversion treatment solution is adjusted so that the free acidity (FA) is in the range of 8.0 to 12.0 points. If it is less than 8.0 points, care must be taken not to cause insufficient film adhesion or decrease in film corrosion resistance. If it exceeds 12.0 points, the surface electrical resistance value will increase, and the film adhesion will Care must be taken not to cause a decrease.
- FA free acidity
- the film chemical conversion treatment with the film chemical conversion treatment liquid can be performed by a general method capable of bringing the treatment liquid into contact with the surface of the magnesium-lithium alloy for a certain period of time, such as immersing the magnesium-lithium alloy in the film chemical conversion treatment liquid. it can.
- the film chemical conversion treatment liquid is preferably carried out at a temperature of 40 to 80 ° C., preferably about 55 to 65 ° C. This is because the chemical reaction between magnesium and lithium and fluorine can be performed quickly and satisfactorily.
- the immersion time is preferably 0.5 to 5 minutes, more preferably about 1.5 to 4.5 minutes. This is because magnesium fluoride and lithium fluoride are generated on the surface of the magnesium-lithium alloy and the combined action is sufficiently exhibited. If the immersion time is less than 0.5 minutes, it is necessary to be careful not to cause insufficient film adhesion, decrease in film corrosion resistance, etc. If it exceeds 5 minutes, the surface electrical resistance value will increase due to excessive treatment, Care must be taken not to cause a decrease in coating adhesion.
- the treatment step with the film chemical conversion treatment solution after the degreasing, the treatment step with the low electrical resistance treatment solution, and the surface conditioning treatment.
- the degreasing, the treatment process with the low electrical resistance treatment liquid, the surface adjustment treatment, and the film chemical conversion treatment are performed individually, and a water washing treatment is performed between the treatments.
- the magnesium-lithium alloy surface-treated by the method of the present invention can maintain good adhesion to the coating film formed on the surface.
- This coating treatment can be performed after the surface conditioning treatment of the present invention as described above, followed by washing and drying.
- a coating method a primer treatment by epoxy cation electrodeposition coating, a top coating treatment by melamine resin or the like, or a general baking coating method can be used.
- the magnesium-lithium alloy surface-treated by the method of the present invention can provide excellent corrosion resistance and can reduce the surface electric resistance value.
- it can be used for mobile phones, notebook computers, portable translators, video, etc.
- a camera, a digital camera, etc. it can be effectively used as various electric equipment casing parts that are required to have high electromagnetic shielding properties and a low surface electric resistance value for grounding from a substrate.
- the surface treatment by the method of the present invention can maintain excellent corrosion resistance and low surface electrical resistance even if the obtained rolled material is processed by pressing after the magnesium-lithium alloy rolled material is processed. it can. Therefore, the surface treatment according to the method of the present invention may be performed on the magnesium-lithium alloy in the state of the part after press working, or may be performed on the magnesium-lithium alloy in the state of the rolled material before processing. It may be a thing.
- the magnesium-lithium alloy obtained through all the steps described above is a cylindrical A probe (contact surface area 3.14 mm 2 of one needle) having a pin interval of 10 mm and a pin tip diameter of 2 mm (Mitsubishi Chemical Analytical Co., Ltd.).
- the surface electric resistance value of the ammeter when the surface is pressed against the surface with a load of 240 g can be 1 ⁇ or less. Further, the surface electric resistance value of the ammeter when this probe is pressed with a load of 60 g can be 10 ⁇ or less, and 1 ⁇ or less when adjusted to preferable conditions.
- the 240g load assumes the fixing force when grounding the magnesium-lithium alloy by screw fixing, and the 60g load assumes the fixing force when grounding the magnesium-lithium alloy by tape fixing. is doing. Therefore, the magnesium-lithium alloy obtained by the surface treatment method of the present invention can be suitably used as an electronic equipment casing component that needs to be grounded from the substrate.
- a cylindrical two-probe having a pin-to-pin diameter of 2 mm and a pin tip diameter of 2 mm is formed on the surface of the magnesium-lithium alloy.
- the surface electric resistance value of the ammeter when a 14 mm 2 ) probe is pressed with a load of 240 g can be set to 1 ⁇ or less.
- the magnesium-lithium alloy has advantages such as the ultra-light weight of the magnesium-lithium alloy and the reduction in processing cost due to room temperature pressing, the magnesium-lithium alloy of the present invention subjected to the treatment step with the low electrical resistance treatment liquid. Can be used for electronic equipment casing parts that require electromagnetic shielding properties or need to be grounded from the substrate.
- Examples 1 to 13, Comparative Examples 1 to 19 As an object to be treated, a rolled material having a length of 50 mm, a width of 50 mm, and a thickness of 1.0 mm made of a magnesium-lithium alloy (“Santalia material” manufactured by Santoku Co., Ltd .: lithium 14% by mass, aluminum 1% by mass, magnesium balance). Prepared as a test piece.
- a magnesium-lithium alloy (“Santalia material” manufactured by Santoku Co., Ltd .: lithium 14% by mass, aluminum 1% by mass, magnesium balance).
- this test piece was degreased by immersing in a strong alkaline aqueous solution (manufactured by Million Chemical Co., Ltd .: 30% aqueous solution of trade name GFMG15SX) maintained at a temperature of 80 ° C. for 8 minutes.
- a strong alkaline aqueous solution manufactured by Million Chemical Co., Ltd .: 30% aqueous solution of trade name GFMG15SX
- the test piece after the degreasing treatment was washed with water and then subjected to a treatment step using a low electrical resistance treatment solution shown in Table 1.
- This low electrical resistance treatment solution was prepared by adding zinc oxide and primary aluminum phosphate to phosphoric acid and adjusting the zinc and aluminum in the treatment solution to the ratios shown in Table 1.
- test piece was surface-treated by immersing in a strong alkaline aqueous solution (manufactured by Million Chemical Co., Ltd .: 45% aqueous solution of trade name GFMG15SX) for 2 minutes after washing with water.
- a strong alkaline aqueous solution manufactured by Million Chemical Co., Ltd .: 45% aqueous solution of trade name GFMG15SX
- test piece was immersed in a film chemical conversion treatment solution composed of an aqueous ammonium fluoride solution containing the fluoride shown in Table 1 at 60 ° C. for 180 seconds after washing with water.
- This film chemical conversion treatment solution was used by adjusting the amount of fluorine in ammonium fluoride to the amount shown in Table 1.
- test pieces obtained through the water washing and drying steps were prepared for one condition, and two pieces were evaluated for surface electrical resistance and bare corrosion resistance.
- the remaining two sheets were subjected to general baking coating for magnesium alloy as follows.
- the undercoat was painted with an epoxy resin paint primer and baked at 150 ° C. for 20 minutes, and the overcoat was baked with an acrylic paint at 150 ° C. for 20 minutes to give a total film thickness of 40 to 50 ⁇ m.
- the coating performance evaluation was performed on the test piece subjected to this coating.
- -Surface electrical resistance value For the surface electrical resistance value, a Lorester EP2 probe A probe (manufactured by Mitsubishi Chemical Analytech Co., Ltd .: 10 mm between pins, 2.0 mm in pin tip diameter (contact surface area of 3.14 mm 2 per needle), spring pressure 240 g) is used. The surface electrical resistance value was measured by pressing a pin on the center, top and bottom of the test piece surface. The measurement was performed three times for each test piece, and the total value was obtained by measuring six times in total for two sheets.
- a Lorester EP2 probe A probe manufactured by Mitsubishi Chemical Analytech Co., Ltd .: 10 mm between pins, 2.0 mm in pin tip diameter (contact surface area of 3.14 mm 2 per needle), spring pressure 240 g
- the surface electrical resistance value was measured by pressing a pin on the center, top and bottom of the test piece surface. The measurement was performed three times for each test piece, and the total value was obtained by measuring six times in total for two sheets.
- the measured value of 240 g is measured by pressing against the surface of the test piece until the pin of the two-probe probe retracts against the spring pressure.
- the case of less than 0.0 ⁇ was indicated as “ ⁇ ”
- the case of less than 1.0 to 1000 ⁇ was indicated as “ ⁇ ”, 1000 ⁇ or more, or “ ⁇ ” when measurement was impossible even once.
- the measured value of 60 g is measured by pressing a load of 30 g on the probe tip (main body 30 g) and pressing it on the surface of the test piece.
- the case of less than 10.0 ⁇ is “ ⁇ ”
- the case of 10.0 to less than 1000 ⁇ is “ ⁇ ”, 1000 ⁇ or more, or “ ⁇ ” if measurement is impossible even once.
- the measured value of 240 g assumes the case where the ground is fixed to the surface of the member with screws, and the measured value of 60 g assumes the case where the ground is fixed to the surface of the member.
- -Bare corrosion resistance test Put the test piece into a test tank set at 35 ° C by spraying with salt water according to JIS Z 2371 (SST test), spray 5% saline solution, take out after 24 hours, wash the surface with water, and surface rust area (%)It was confirmed.
- the case of 0% was designated as “ ⁇ 5”, the case of 5% or less as “ ⁇ ”, the case of exceeding 5% and less than 30% as “ ⁇ ”, and the case of 30% or more as “X”.
- -Bare moisture resistance test- The test piece was put in a thermostatic oven with a temperature of 50 ° C. and a humidity of 90%, and taken out after 120 hours to confirm the surface rust area (%). The case of 0% was designated as “ ⁇ 5”, the case of 5% or less as “ ⁇ ”, the case of exceeding 5% and less than 30% as “ ⁇ ”, and the case of 30% or more as “X”.
- -Coating corrosion resistance test- A coated test piece was cut with a cutter knife. This was put into a test tank set at 35 ° C. by a salt spray test method (SST test) according to JIS Z 2371, sprayed with 5% saline, and taken out after 240 hours.
- a tape was applied to the dried coating film cut part and peeled off, and the one-side maximum peel width (mm) after tape peeling was measured. “ ⁇ ” for less than 2.0 mm, “ ⁇ ” for 2.0 mm to less than 3.0 mm, “ ⁇ ” for 3.0 mm to less than 6.0 mm, “ ⁇ ” for 6.0 mm or more " -Water resistance test for coating film-
- the coated test piece was placed in boiling (100 ° C.) hot water, immersed for 60 minutes, then taken out, wiped with water on the surface, and left at room temperature for 1 hour.
- the case of 0% was designated as “ ⁇ 5”, the case of 5% or less as “ ⁇ ”, the case of exceeding 5% and less than 30% as “ ⁇ ”, and the case of 30% or more as “X”.
- test piece according to the present invention has a low surface electrical resistance value, and excellent bare corrosion resistance and coating film adhesion can be obtained.
- Examples 14 to 20 The test pieces of Examples 14 to 20 were obtained in the same manner as in Example 7 except that the film chemical conversion treatment solution shown in Table 3 was used.
- the film chemical conversion treatment liquid was used by adjusting an aqueous solution so that ammonium fluoride and primary aluminum phosphate had the fluorine amount and the aluminum amount shown in Table 1.
- the surface electrical resistance value, bare corrosion resistance, and coating film performance evaluation of the obtained test piece were performed in the same manner as in the above examples.
- the magnesium-lithium alloy and the manufacturing method thereof according to the present invention can be used for various electronic equipment casings that need to be grounded.
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Abstract
Description
被処理対象物として、マグネシウム-リチウム合金(株式会社三徳製「サンマリア材」:リチウム14質量%、アルミニウム1質量%、マグネシウム残部)からなる縦50mm、横50mm、厚さ1.0mmの圧延材を試験片として用意した。
-表面電気抵抗値-
表面電気抵抗値は、ロレスターEP2探針Aプローブ(株式会社三菱化学アナリテック社製:ピン間10mm、ピン先直径2.0mm(1針の接触表面積3.14mm2)、バネ圧240g)を用い、試験片表面の中央部、上部、下部に、それぞれピンを押圧して表面電気抵抗値を測定した。測定は一枚の試験片につき3回測定し、2枚で合計6回測定してその平均値を求めた。
-裸耐食性試験-
JIS Z 2371に準じた塩水噴霧試験方法(SST試験)によって、35℃に設定した試験槽に試験片を入れ、5%食塩水を噴霧して24時間後に取り出し、表面を水洗いし、表面錆面積(%)を確認した。0%の場合を「◎」、5%以下の場合を「○」、5%を超え、30%未満の場合を「△」、30%以上の場合を「×」とした。
-裸耐湿試験-
温度50℃、湿度90%の恒温恒湿器に試験片を入れ、120時間後に取り出し、表面錆面積(%)を確認した。0%の場合を「◎」、5%以下の場合を「○」、5%を超え、30%未満の場合を「△」、30%以上の場合を「×」とした。
-塗膜耐食性試験-
塗装を施した試験片にカッターナイフで切り込みを入れたものを用意した。これを、JIS Z 2371に準じた塩水噴霧試験方法(SST試験)によって、35℃に設定した試験槽に入れ、5%食塩水を噴霧して240時間後に取り出した。表面を水洗いして乾燥した後、乾燥した塗膜カット部にテープを貼って剥離し、テープ剥離後の片側最大剥離幅(mm)を測定した。2.0mm未満の場合を「◎」、2.0mm~3.0mm未満の場合を「○」、3.0mm~6.0mm未満の場合を「△」、6.0mm以上の場合を「×」とした。
-塗膜耐水性試験-
沸騰(100℃)しているお湯の中に、塗装を施した試験片を入れ、60分間浸漬後、試験片を取り出し、表面の水を拭いて常温で1時間放置した。その後、試験片の表面に1mmの碁盤目状の切り込みを入れ、その表面にテープを貼って剥離し、剥離された塗膜の面積を測定した。0%の場合を「◎」、5%以下の場合を「○」、5%を超え、30%未満の場合を「△」、30%以上の場合を「×」とした。
(実施例14~20)
表3に示す皮膜化成処理液を使用する以外は、上記実施例7と同様に処理を行って、実施例14~20の試験片を得た。
Claims (6)
- マグネシウム-リチウム合金の表面を、アルミニウムおよび亜鉛の金属イオンを含有する無機酸の処理液で処理する工程を具備することを特徴とするマグネシウム-リチウム合金の表面処理方法。
- 表面調整を行った後、フッ素化合物を含有する処理液に浸漬して皮膜化成処理する工程をさらに具備する請求項1記載のマグネシウム-リチウム合金の表面処理方法。
- 無機酸の処理液には、アルミニウムとして0.021~0.47g/lと、亜鉛として0.0004~0.029g/lとが含有された請求項1または2記載のマグネシウム-リチウム合金の表面処理方法。
- フッ素化合物を含有する処理液として、3.33~40g/lの酸性フッ化アンモニウム水溶液が用いられた請求項2または3記載のマグネシウム-リチウム合金の表面処理方法。
- 請求項1ないし4の何れか1記載の表面処理方法によって得られるマグネシウム-リチウム合金。
- ピン間10mm、ピン先直径2mmの円柱状2探針プローブ(1針の接触表面積3.14mm2)を、240gの荷重で表面に押圧した時の電流計の表面電気抵抗値が1Ω以下である請求項5記載のマグネシウム-リチウム合金。
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JP2016113676A (ja) * | 2014-12-16 | 2016-06-23 | 富士通株式会社 | 化成皮膜を有する筐体の製造方法、化成皮膜を有する筐体、筐体保持治具 |
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KR101502915B1 (ko) * | 2013-10-18 | 2015-03-16 | 주식회사 대동 | 마그네슘 주조재의 친환경적 화성처리 방법 및 이에 의해 제조된 마그네슘 주조재 |
US11180832B2 (en) | 2018-12-17 | 2021-11-23 | Canon Kabushiki Kaisha | Magnesium-lithium alloy member, manufacturing method thereof, optical apparatus, imaging apparatus, electronic apparatus and mobile object |
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