KR101863105B1 - SURFACE TREATMENT METHOD USED IN SURFACE TREATMENT SOLUTION FOR Al ALLOYS GOODS - Google Patents
SURFACE TREATMENT METHOD USED IN SURFACE TREATMENT SOLUTION FOR Al ALLOYS GOODS Download PDFInfo
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- KR101863105B1 KR101863105B1 KR1020160179729A KR20160179729A KR101863105B1 KR 101863105 B1 KR101863105 B1 KR 101863105B1 KR 1020160179729 A KR1020160179729 A KR 1020160179729A KR 20160179729 A KR20160179729 A KR 20160179729A KR 101863105 B1 KR101863105 B1 KR 101863105B1
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
- C25D11/02—Anodisation
- C25D11/026—Anodisation with spark discharge
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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
- C23G1/14—Cleaning or pickling metallic material with solutions or molten salts with alkaline solutions
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- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
- C25D11/02—Anodisation
- C25D11/04—Anodisation of aluminium or alloys based thereon
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
- C25D11/02—Anodisation
- C25D11/04—Anodisation of aluminium or alloys based thereon
- C25D11/16—Pretreatment, e.g. desmutting
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Abstract
Description
본 발명은 알루미늄합금재의 표면처리용액의 조성물 및 이를 이용한 표면처리방법에 관한 것으로서, 더욱 상세하게는 마그네슘을 합금한 알루미늄합금재의 표면에 산화막을 형성하여 경도를 용이하게 향상할 수 있도록 하는 알루미늄합금재의 표면처리용액의 조성물 및 이를 이용한 표면처리방법에 관한 것이다.The present invention relates to a composition of a surface treatment solution of an aluminum alloy material and a surface treatment method using the same. More particularly, the present invention relates to an aluminum alloy material capable of easily forming an oxide film on the surface of an aluminum alloy material, To a composition of a surface treatment solution and a surface treatment method using the same.
일반적으로 알루미늄합금은 소재 특성인 경량성, 가공성, 내식성 등으로 모든 산업분야에서 활용되는 가장 중요한 비철금속재료이며, 다량 사용되는 것은 알루미늄 본연의 우수한 성질의 활용 때문이기도 하지만, 사용처에 따라 알루미늄의 취약점인 표면경도(내마모성)와 내열성 등을 보강하는 표면처리를 하여 사용하기 때문입니다.In general, aluminum alloy is the most important nonferrous metal material that is used in all industrial fields because of lightness, workability and corrosion resistance, which are material characteristics. The reason why aluminum alloy is used in large quantity is due to utilization of superior properties of aluminum itself. However, This is because surface treatment is used to reinforce surface hardness (abrasion resistance) and heat resistance.
그래서 상기 알루미늄합금을 재질로 하는 제품을 표면 처리하기 위하여, 아노다이징(anodizing)이라고 지칭되는 양극산화피막 처리방법 등이 있으며, 종래의 아노다이징 처리방법에 사용되는 전해액은 수산화나트륨(NaOH) 용액 또는 황산(H2SO4) 등을 주로 사용하고 있다.Therefore, in order to surface-treat a product made of the above-mentioned aluminum alloy, there is an anodic oxide coating treatment method called anodizing, etc. The electrolytic solution used in the conventional anodizing treatment method is a sodium hydroxide (NaOH) solution or a sulfuric acid H 2 SO 4 ) are mainly used.
여기서 아노다이징(양극산화법)은 이름 그대로 알루미늄제품을 전해액에서 양극으로 하고 통전하면 양극에서 발생하는 산소에 의해서 알루미늄 표면이 산화되어 산화알루미늄(Al2O3)의 피막이 생기게 된다.Here, anodizing (anodizing) is an aluminum product as the name implies, and when the anode is used as an anode, the aluminum surface is oxidized by the oxygen generated from the anode, and aluminum oxide (Al 2 O 3 ) film is formed.
예컨대 종래에는 수산화나트륨(NaOH) 용액 또는 황산(H2SO4) 용액 등의 전해액 이외에도 본 출원인에 의해 특허출원 제10-2012-0014326호로 출원되어 등록된 기술이 있으며, 이는 물 중량을 기준으로 하여 황산(H2SO4) 1 ~ 20중량부와 일인산암모늄(NH4H2PO4) 1 ~ 5중량부, 인산삼나트륨(Na3PO4) 1 ~ 25중량부를 물에 혼합하는 것으로 이루어진다.For example, conventionally, there is a technology applied and registered by the present applicant as a patent application No. 10-2012-0014326 in addition to an electrolyte such as a sodium hydroxide (NaOH) solution or a sulfuric acid (H 2 SO 4 ) solution, 1 to 20 parts by weight of sulfuric acid (H 2 SO 4 ), 1 to 5 parts by weight of ammonium monophosphate (NH 4 H 2 PO 4 ) and 1 to 25 parts by weight of trisodium phosphate (Na 3 PO 4 ) .
이러한 종래 기술은 물(H2O)에 함유된 황산과 일인산암모늄(NH4H2PO4)으로 인하여 치밀성이 향상되고, 인산삼나트륨(Na3PO4)의 전해 촉매 작용과 인산이수소칼륨(KH2PO4)의 융합 작용으로 인하여 산화막의 생성 시간을 단축할 뿐만 아니라 안정되고 두터운 산화막을 형성할 수 있는 것이다.This prior art technique has been improved in densification due to sulfuric acid and ammonium monophosphate (NH 4 H 2 PO 4 ) contained in water (H 2 O), and the electrolytic catalytic action of trisodium phosphate (Na 3 PO 4 ) Potassium (KH 2 PO 4 ) fusion function not only shortens the formation time of the oxide film but also forms a stable and thick oxide film.
그러나 종래에는 알루미늄합금재의 표면에 산화알루미늄인 산화막을 형성하기 때문에, 투터운 산화막을 형성하기에 한계가 있을 뿐만 아니라 표면의 경도를 높이는 것도 한계가 있다는 단점이 있다.However, conventionally, since an oxide film of aluminum oxide is formed on the surface of an aluminum alloy material, there is a limitation in forming a toe oxide film, and there is also a limitation in increasing the hardness of the surface.
본 발명은 상기와 같은 종래 기술의 문제점을 해결하기 위하여 안출된 것으로서, 본 발명의 목적은 마그네슘을 합금한 알루미늄합금재의 표면에 산화알루미늄과 산화마그네슘이 혼합된 산화막을 형성함으로써, 산화막의 두께를 두텁게 함과 아울러 경도를 용이하게 향상할 수 있는 알루미늄합금재의 표면처리용액의 조성물 및 이를 이용한 표면처리방법을 제공하는 데 있다.SUMMARY OF THE INVENTION The present invention has been made in order to solve the problems of the prior art as described above, and it is an object of the present invention to provide an aluminum alloy material, And a surface treatment method using the composition of the surface treatment solution of an aluminum alloy material capable of easily improving the hardness.
본 발명은 상기와 같은 목적을 달성하기 위하여, 알루미늄합금재의 표면에 피막을 형성하는 표면처리방법에 이용되는 표면처리용액의 조성물에 있어서, 물의 중량을 기준으로 하여 수산화나트륨(NaOH) 0.1 ~ 25중량부와 인산삼나트륨(Na3PO4) 0.1 ~ 3중량부, 암모니아수(NH3OH) 0.1 ~ 1중량부, 마그네슘파우더(Mg power)0.1 ~ 1중량부를 물에 혼합한 것으로 이루어지는 알루미늄합금재의 표면처리용액의 조성물을 제공한다.In order to achieve the above object, the present invention provides a surface treatment solution composition for use in a surface treatment method for forming a film on a surface of an aluminum alloy material, comprising 0.1 to 25 wt% of sodium hydroxide (NaOH) 0.1 to 3 parts by weight of tin phosphate (Na 3 PO 4 ), 0.1 to 3 parts by weight of ammonia water (NH 3 OH), and 0.1 to 1 part by weight of magnesium powder are mixed in water. A composition of the treatment solution is provided.
또한 본 발명은 알루미늄합금재의 표면에 피막을 형성하는 것으로 이루어지는 알루미늄합금재의 표면처리방법에 있어서, 알칼리용액인 활성화액으로 알루미늄합금재의 표면을 활성화하는 활성화단계, 상기 활성화단계로 처리된 알루미늄합금재를 한차례 또는 두차례로 세척하는 수세단계, 상기 수세단계로 세척된 알루미늄합금재를 표면처리용액에 넣고 알루미늄합금재에 양극을 인가함과 아울러 표면처리용액에 음극을 인가하여 30 ~ 50 V에서 1 ~ 10분간 처리하여 피막으로 형성하는 TAC(TECH ARC COATING)단계, 상기 TAC(TECH ARC COATING)단계에서 처리된 알루미늄합금재를 세척한 뒤에 이를 건조하는 마무리단계로 이루어지는 알루미늄합금재의 표면처리방법을 제공한다.The present invention also provides a method for surface treatment of an aluminum alloy material comprising forming a film on the surface of an aluminum alloy material, comprising the steps of: activating a surface of the aluminum alloy material with an activating solution which is an alkali solution; The aluminum alloy material washed in the washing step is applied to the surface treatment solution, the anode is applied to the aluminum alloy material, and the cathode is applied to the surface treatment solution. A TAC (TECH ARC COATING) step in which the aluminum alloy material is treated in a TAC (TECH ARC COATING) step, and a finishing step in which the aluminum alloy material is dried.
이와 같이 이루어지는 본 발명에 의한 알루미늄합금재의 표면처리용액의 조성물 및 이를 이용한 표면처리방법은 마그네슘파우더를 혼합한 표면처리용액을 이용하여 마그네슘을 합금한 알루미늄합금재의 표면에 산화알루미늄과 산화마그네슘이 혼합된 산화막인 피막을 형성하기 때문에, 산화알루미늄과 산화마그네슘이 표면에 균일하고도 두텁게 형성되어 알루미늄합금재의 표면의 경도를 용이하게 향상할 수 있다는 이점이 있다.The composition of the surface treatment solution of the aluminum alloy material according to the present invention and the surface treatment method using the aluminum alloy material according to the present invention are prepared by mixing aluminum oxide and magnesium oxide on the surface of an aluminum alloy material alloyed with magnesium using a surface treatment solution prepared by mixing magnesium powder Since the oxide film is formed, aluminum oxide and magnesium oxide are formed uniformly and thickly on the surface, so that the hardness of the surface of the aluminum alloy material can be easily improved.
이하 본 발명에 의한 알루미늄합금재의 표면처리용액의 조성물 및 이를 이용한 표면처리방법의 실시예를 더욱 상세하게 설명한다.BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the surface treatment solution composition of the aluminum alloy material according to the present invention and the surface treatment method using the same will be described in detail.
본 발명에 의한 알루미늄합금재의 표면처리용액의 조성물은 표면처리할 때에 마그네슘파우더를 이용함으로써, 알루미늄합금재의 표면에 산화알루미늄(Al2O3)과 산화마그네슘(MgO)가 혼합된 피막이 형성하는 것이다.The composition of the surface treatment solution of the aluminum alloy material according to the present invention is formed by coating a mixture of aluminum oxide (Al 2 O 3 ) and magnesium oxide (MgO) on the surface of the aluminum alloy material by using magnesium powder in the surface treatment.
즉 본 발명에 의한 알루미늄합금재의 표면처리용액은 물의 중량을 기준으로 하여 수산화나트륨(NaOH) 0.1 ~ 25중량부와 인산삼나트륨(Na3PO4) 0.1 ~ 3중량부, 암모니아수(NH3OH) 0.1 ~ 1중량부, 마그네슘파우더(Mg power)0.1 ~ 1중량부를 물에 혼합한 것으로 이루어진다.That is, the surface treatment solution of the aluminum alloy material according to the present invention may contain 0.1 to 25 parts by weight of sodium hydroxide (NaOH), 0.1 to 3 parts by weight of trisodium phosphate (Na 3 PO 4 ), ammonia water (NH 3 OH) 0.1 to 1 part by weight, and magnesium powder (Mg power) in an amount of 0.1 to 1 part by weight.
여기서 본 발명에 적용되는 알루미늄합금재는 구리와 마그네슘 등이 합금된 알루미늄합금인 두랄루민을 사용함이 바람직하며, 상기 수산화나트륨은 피막의 균일성에 영향을 미치며, 상기 인산삼나트륨은 전해 촉매 작용을 하고, 암모니아수는 피막의 얼룩를 제거하는 작용을 하고, 마그네슘파우더는 알루미늄합금재의 표면에 산화마그네슘 형태로 피막을 형성하기 위한 것이다.The aluminum alloy material used in the present invention is preferably duralumin, which is an aluminum alloy alloyed with copper and magnesium or the like. The sodium hydroxide influences the uniformity of the film. The trisodium phosphate acts as an electrolytic catalyst, And the magnesium powder is for forming a film in the form of magnesium oxide on the surface of the aluminum alloy material.
특히 상기와 같은 알루미늄합금재의 표면처리용액을 이용한 표면처리방법은 활성화단계 → 수세단계 → TAC(TECH ARC COATING)단계를 거치면서 알루미늄합금 재의 표면에 피막을 형성한 뒤, 마무리단계에서 알루미늄합금재를 세척 및 건조하게 된다.Particularly, in the surface treatment method using the surface treatment solution of the aluminum alloy material as described above, a film is formed on the surface of the aluminum alloy material through the step of activation → water washing → TECH ARC COATING, and then the aluminum alloy material Washed and dried.
여기서 상기 활성화단계는 알칼리용액인 활성화액으로 알루미늄합금재의 표면을 활성화하는 것으로서, 상기 활성화액은 물의 중량을 기준으로 하여 수산화나트륨(NaOH) 0.1 ~ 50중량부와 수산화칼륨(KOH) 0.1 ~ 20중량부를 물에 혼합한 것이다.Wherein the activating step activates the surface of the aluminum alloy material with an activating solution which is an alkali solution, wherein the activating solution comprises 0.1 to 50 parts by weight of sodium hydroxide (NaOH) and 0.1 to 20 parts by weight of potassium hydroxide (KOH) The part is mixed with water.
즉 상기 수산화나트륨과 수산화칼륨은 수산기를 구비한 물질로서 알루미늄합금재의 표면에서 자연적으로 불규칙적으로 발생된 산화막을 제거함과 아울러 표면을 활성화하기 위한 것으로서, 상기 활성화액에 알루미늄합금재를 담궈서 알루미늄합금에 음극을 연결하고 활성화액에 양극을 연결하여 통상 70 ~ 100 V(볼트) 전압으로 1 ~ 5분간 통전하는 것으로서, 이러한 전압과 시간은 알루미늄합금재의 표면에 있는 산화막을 제거하면서 활성화하기에 적합한 온도와 시간으로서, 이 산화막의 상태에 따라 가변될 수 있다.That is, the sodium hydroxide and the potassium hydroxide are materials having a hydroxyl group and are used for removing an oxide film generated naturally irregularly on the surface of the aluminum alloy material and for activating the surface. An aluminum alloy material is immersed in the activation solution, And the anode and the anode are connected to the activation liquid. The voltage and the time are normally applied at a voltage of 70 to 100 V (volt) for 1 to 5 minutes. The voltage and the time are adjusted to a temperature suitable for activation while removing the oxide film on the surface of the aluminum alloy material, And can be varied depending on the state of the oxide film.
상기 수세단계는 상기 활성화단계로 처리된 알루미늄합금재를 한차례 또는 두차례로 세척하는 것이며, 통상적으로 두차례로 수세함이 바람직하다.In the washing step, the aluminum alloy material treated in the activating step is washed once or twice, and is usually washed twice.
즉 상기 활성화단계에서 활성화된 알루미늄합금재를 1차적으로 세척함과 아울러 디스머트를 수행하는 바, 이는 인산(H3PO4)과 암모니아수(NH4OH)를 물에 혼합한 수제액을 이용하여 상기 활성화단계에서 알루미늄합금재에 묻은 활성화액을 제거함과 아울러 이물질을 제거하게 된다.That is, the aluminum alloy material activated in the activation step is firstly cleaned and the desmut is performed by using an aqueous solution containing phosphoric acid (H 3 PO 4 ) and ammonia water (NH 4 OH) In the activating step, the activating liquid adhering to the aluminum alloy material is removed, and foreign substances are removed.
그리고 2차적으로 세척하는 것은 1차적으로 수세된 알루미늄합금재를 흐르는 물로 수세하는 것으로서, 알루미늄합금재의 표면에 묻은 이물질을 다시 세척하는 것이다.The secondary cleaning is to rinse the foreign matter on the surface of the aluminum alloy material by washing the primary aluminum alloy material with water flowing therethrough.
아무튼 상기 TAC(TECH ARC COATING)단계에서는 상기 수세단계로 세척된 알루미늄합금재를 표면처리용액에 넣고 알루미늄합금재에 양극을 인가함과 아울러 표면처리용액에 음극을 인가하여 30 ~ 50 V에서 1 ~ 10분간 처리하여 피막으로 형성하게 된다.In the TAC (TECH ARC COATING) step, the aluminum alloy washed in the washing step is put into the surface treatment solution, and an anode is applied to the aluminum alloy material. In addition, the cathode is applied to the surface treatment solution, For 10 minutes to form a film.
특히 이미 언급한 바와 같이, 상기 TAC(TECH ARC COATING)단계의 표면처리용액은 물의 중량을 기준으로 하여 수산화나트륨(NaOH) 0.1 ~ 25중량부와 인산삼나트륨(Na3PO4) 0.1 ~ 3중량부, 암모니아수(NH3OH) 0.1 ~ 1중량부, 마그네슘파우더(Mg power)0.1 ~ 1중량부를 물에 혼합한 것이다.In particular, as mentioned above, the surface treatment solution of the TAC (TECH ARC COATING) step is prepared by adding 0.1 to 25 parts by weight of sodium hydroxide (NaOH) and 0.1 to 3 parts by weight of trisodium phosphate (Na 3 PO 4 ) 0.1 to 1 part by weight of ammonia water (NH 3 OH), and 0.1 to 1 part by weight of magnesium powder are mixed in water.
여기서 상기 수산화나트륨(NaOH)는 피막의 균일성에 영향을 미치는 것으로서, 0.1 중량부보다 작게 혼합하는 것은 표면의 균일성에 영향을 미치기에 부족한 양이고, 25중량부보다 많이 혼합하는 것은 오히려 표면의 균일성이 악영향을 미칠 수 있는 것이다.It is noted that sodium hydroxide (NaOH) influences the uniformity of the film. Mixing less than 0.1 part by weight is insufficient to affect the uniformity of the surface, and mixing more than 25 parts by weight results in uniformity of the surface This can have an adverse effect.
참고로 수산화나트륨(NaOH)은 탄산나트륨의 가성화(caustification)와 염화나트륨의 전기분해로 제조되는 것이며, 조해성이 강하며, 순수한 것은 무색 투명한 결정이지만 보통 불순물이 포함되어 약간 불투명한 흰색의 고체이며, 수산화나트륨 용액은 난용성 규산염, 인산염, 황산염과 함께 녹이면 수용성 나트륨염이 생기므로 이러한 용해에 이용되며, 저온에서 플루오르와 반응하여 플루오르화나트륨과 물·산소를 생성하고 염소·브롬·요오드 등과 반응한다.For reference, sodium hydroxide (NaOH) is produced by caustification of sodium carbonate and electrolysis of sodium chloride. It is highly deliquescent, and pure is a colorless transparent crystal, but it is usually a slightly opaque white solid containing impurities. Sodium solution is soluble in poorly soluble silicate, phosphate and sulphate. It is soluble in sodium salt. It reacts with fluorine at low temperature to produce sodium fluoride, water and oxygen and reacts with chlorine, bromine and iodine.
상기 인산삼나트륨은 전해 촉매 작용을 하는 것으로서, 피막의 생성 시간을 단축할 뿐만 아니라 안정되고 두터운 피막을 형성하게 되며, 상기 인산삼나트륨(Na3PO4)은 알루니늄(Al)와 산소(O)의 전해 촉매 역할을 하며, 물 중량을 기준으로 하여 1 중량부보다 작게 함유하면 알루니늄(Al)와 산소(O)의 전해 촉매 역할에 미흡하고, 3중량부보다 많이 함유하면 불필요한 인산염이 발생되어 표면의 균일성에 악영향을 미친다.The above-mentioned trisodium phosphate is an electrolytic catalyst and not only shortens the film formation time but also forms a stable and thick film. The trisodium phosphate (Na 3 PO 4 ) O). When the amount of the electrolytic catalyst is less than 1 part by weight based on the weight of water, the electrolytic catalyst of aluminum (Al) and oxygen (O) is insufficient. When the amount of the electrolytic catalyst is more than 3 parts by weight, Which adversely affects the uniformity of the surface.
참고로 인산삼나트륨(Na3PO4)은 비누와 세제로 쓰이고, 인산(H3PO4)의 3개의 수소 [0021] 원자가 나트륨(Na) 원자로 치환되어 만들어진다.For reference, trisodium phosphate (Na3PO4) is used as soap and detergent, and is made by replacing three hydrogen atoms of phosphoric acid (H3PO4) with sodium (Na) atoms.
상기 암모니아수는 피막의 얼룩를 제거하는 작용을 하는 것으로서, 0.1중량부보다 작게 함유하면 피막의 얼룩을 제거하기에 미흡하며, 1중량부보다 많이 넣어도 피막의 얼룩 제거에 미치는 영향이 적으므로 1중량부보다 많이 넣을 필요가 없는 것이다.The ammonia water acts to remove the stain of the coating. If it is contained in an amount less than 0.1 part by weight, it is insufficient to remove the stain of the coating. If the amount is more than 1 part by weight, You do not need to put much.
마그네슘파우더는 알루미늄합금재의 표면에 산화알루미늄과 함께 산화마그네슘 형태로 피막을 형성하기 위한 것으로서, 0.1중량부보다 작게 함유하면 용액에 함유된 양이 작아서 산화마그네슘 형태의 피막을 형성하기에 미흡하며, 1중량부보다 많이 함유하더라도 1중량부 초과된 구간에서 혼합양의 증가분에 대한 피막의 두께의 증가량에 비례하지 않기 때문에 1중량부를 초과하여 혼합할 필요가 없은 것이다.The magnesium powder is used for forming a coating film in the form of magnesium oxide together with aluminum oxide on the surface of the aluminum alloy material. When the amount is smaller than 0.1 part by weight, the amount contained in the solution is insufficient to form a magnesium oxide type coating film. It is not necessary to mix more than 1 part by weight since it is not proportional to the increase of the thickness of the coating film with respect to the increase of the mixing amount in the interval exceeding 1 part by weight.
그리고 상기 마무리단계에서는 상기 TAC(TECH ARC COATING)단계에서 처리된 알루미늄합금재를 세척한 뒤에 이를 건조하게 된다.In the finishing step, the aluminum alloy material treated in the TAC (TECH ARC COATING) step is washed and dried.
이렇게 본 발명에 의한 알루미늄합금재의 표면처리용액의 조성물을 이용하여 표면처리하게 되면, 피막의 두께가 통상의 피막층의 두께보다 두터운 7㎛ 이상의 두께를 형성할 수 있으며, 초두랄루민계 Al7075-T6합금의 경도보다 1.5배 이상의 표면 경도로 향상되는 것이다.When the surface treatment is carried out using the composition of the surface treatment solution of the aluminum alloy material according to the present invention, the thickness of the coating film can be 7 μm or more thick, which is thicker than the thickness of the usual coating layer. The surface hardness is improved by 1.5 times or more than the hardness.
Claims (4)
알칼리용액인 활성화액으로 알루미늄합금재의 표면을 활성화하는 활성화단계, 상기 활성화단계로 처리된 알루미늄합금재를 한차례 또는 두차례로 세척하는 수세단계, 상기 수세단계로 세척된 알루미늄합금재를 표면처리용액에 넣고 알루미늄합금재에 양극을 인가함과 아울러 표면처리용액에 음극을 인가하여 30 ~ 50 V에서 1 ~ 10분간 처리하여 피막으로 형성하는 TAC(TECH ARC COATING)단계, 상기 TAC(TECH ARC COATING)단계에서 처리된 알루미늄합금재를 세척한 뒤에 이를 건조하는 마무리단계로 이루어지되,
상기 활성화단계는 수산화나트륨(NaOH)와 수산화칼륨(KOH)를 물에 혼합한 황성화액에 알루미늄합금재를 담궈서 알루미늄합금에 음극을 연결하고 활성화액에 양극을 연결하여 70 ~ 100 V(볼트) 전압으로 1 ~ 5분간 통전하여 알루미늄합금재의 표면에서 자연적으로 불규칙적으로 발생된 산화막을 제거함과 아울러 표면을 활성화하며,
상기 TAC(TECH ARC COATING)단계의 표면처리용액은 수산화나트륨(NaOH), 인산삼나트륨(Na3PO4), 암모니아수(NH3OH) 그리고 마그네슘파우더(Mg power)를 물에 혼합한 것을 특징으로 하는 알루미늄합금재의 표면처리방법.A method for surface treatment of an aluminum alloy material comprising forming a film on a surface of an aluminum alloy material,
An activating step of activating the surface of the aluminum alloy material with an activating solution which is an alkaline solution, a washing step of washing the aluminum alloy material treated with the activating step once or twice, an aluminum alloy material washed with the washing step, A TAC (TECH ARC COATING) step in which a positive electrode is applied to an aluminum alloy material and a negative electrode is applied to a surface treatment solution to form a film by treatment at 30 to 50 V for 1 to 10 minutes; And a finishing step of washing the processed aluminum alloy material and then drying the processed aluminum alloy material,
In the activation step, an aluminum alloy material is immersed in a sulfuric acid solution in which sodium hydroxide (NaOH) and potassium hydroxide (KOH) are mixed in water, and a cathode is connected to the aluminum alloy. A positive electrode is connected to the activation liquid and a voltage of 70 to 100 V For 1 to 5 minutes to remove the oxide film generated naturally irregularly from the surface of the aluminum alloy material and to activate the surface,
The TAC (TECH ARC COATING) surface treatment solution of the step is characterized in that a mixture of sodium (NaOH), trisodium phosphate (Na 3 PO 4) hydroxide, ammonia solution (NH 3 OH) and magnesium powder (Mg power) in water Of the surface of the aluminum alloy material.
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