KR960011681B1 - Ceramic coating electrolytes of aluminium or aluminium alloy metals - Google Patents
Ceramic coating electrolytes of aluminium or aluminium alloy metals Download PDFInfo
- Publication number
- KR960011681B1 KR960011681B1 KR1019940014026A KR19940014026A KR960011681B1 KR 960011681 B1 KR960011681 B1 KR 960011681B1 KR 1019940014026 A KR1019940014026 A KR 1019940014026A KR 19940014026 A KR19940014026 A KR 19940014026A KR 960011681 B1 KR960011681 B1 KR 960011681B1
- Authority
- KR
- South Korea
- Prior art keywords
- aluminum
- electrolyte
- ceramic coating
- sodium
- aluminium
- Prior art date
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D13/00—Electrophoretic coating characterised by the process
- C25D13/02—Electrophoretic coating characterised by the process with inorganic material
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D13/00—Electrophoretic coating characterised by the process
- C25D13/22—Servicing or operating apparatus or multistep processes
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Chemical Treatment Of Metals (AREA)
- Other Surface Treatments For Metallic Materials (AREA)
Abstract
Description
본 발명은 금속표면에 코팅물질의 전착에 관한 것으로서, 보다 구체적으로는 부식방지와 표면경도 강화를 위하여 알루미늄 또는 알루미늄합금에 세라믹 코팅을 전착하는데 사용하기 위한 전해질 및 전해질을 이용하여 알루미늄 또는 알루미늄합금의 세라믹 코팅을 전착하는 방법에 관한 것이다.The present invention relates to the electrodeposition of the coating material on the metal surface, and more specifically, to the aluminum or aluminum alloy using an electrolyte and an electrolyte for use in electrodeposition of the ceramic coating on aluminum or aluminum alloy for corrosion protection and surface hardness enhancement. The present invention relates to a method for electrodepositing a ceramic coating.
이미 알려진 기술중에서, 미국 특허 제3,293,158호 공보에는 알루미늄 및 알루미늄합금에 세라믹 코팅을 피복하기 위하여 전해질로서 알루미늄산 나트륨, 볼프람산 나트륨 또는 규산 나트륨의 0.1∼0.3N 수용액을 사용하는 것이 제시되어 있으며, 미국특허 제3,832,293호 공보에는 세락믹 코팅의 전착도장을 위하여 알칼리 금속의 규산염과 수산화물 그리고 Te 또는 Se의 옥시산(oxyacid)촉매를 함유하는 전해질을 사용하는 것이 제시되어 있다.Among the known techniques, U.S. Patent No. 3,293,158 discloses the use of 0.1-0.3N aqueous solution of sodium aluminate, sodium wolframate or sodium silicate as electrolyte to coat ceramic coatings on aluminum and aluminum alloys. Patent 3,832,293 discloses the use of an electrolyte containing silicate and hydroxide of alkali metals and an oxyacid catalyst of Te or Se for electrodeposition coating of a ceracic coating.
양자 모두의 경우에, 코팅의 피복공정은 10∼12분 사이에 전압을 영(0)에서 450V로 승압시키면서 스파크방전방식으로 전기분해하는 것에 의해 수행되며, 이 과정에서 알루미늄 표면상에 실리콘 산화물, 알루미늄산화물, 알루미늄합금 산화물로 되는 코팅막이 형성되고, 그 막은 알루미늄 및 알루미늄합금물질의 내식성을 약 1∼2배 정도 증가시킨다. 그러나 이것은 많은 경우에 충분하다고 할 수 없다.In both cases, the coating process of the coating is carried out by electrolysis in a spark discharge method with a voltage boosted from zero to 450 volts between 10 and 12 minutes, during which the silicon oxide, A coating film of aluminum oxide and aluminum alloy oxide is formed, and the film increases the corrosion resistance of aluminum and aluminum alloy material by about 1 to 2 times. But this is not enough in many cases.
또한 공지의 기술중에는 스파크 방전에 의해 알루미늄에 세라믹 코팅을 피복하기 위한 전해질로서 인산염이나 보론산칼륨과 물 뿐만 아니라 알칼리금속 규산염, 몰리브덴산염, 볼프람산염 또는 크롬산칼륨을 함유하는 전해질을 사용하는 것이 제시되어 있다. 그러나, 이 전해질의 결점은 전기분해의 결과로 수득되는 코팅이 75∼80%의 실리콘 산화물, 5∼7%의 알루미늄 산화물 및 다른 금속 산화물을 함유하며, 3.8∼12.7mkm정도의 너무 얇은 두께와 고도의 다공성으로 인해 내식성이 크지 않다는 것이다.In addition, in the known art, it is proposed to use an electrolyte containing alkali metal silicate, molybdate, wolframate or potassium chromate as well as phosphate or potassium boron and water as an electrolyte for coating a ceramic coating on aluminum by spark discharge. have. However, the drawback of this electrolyte is that the coating obtained as a result of the electrolysis contains 75-80% silicon oxide, 5-7% aluminum oxide and other metal oxides, and is too thin in thickness and altitude of 3.8-12.7mkm. Due to the porosity of the corrosion resistance is not great.
기술적인 관점에서 볼때, 본 발명에 가장 근접한 분야의 선행 기술로는 소비에트연방공화국 특허 제964026호가 있다. 상기 특허에서는 알루미늄 또는 알루미늄합금의 세라믹코팅을 피복하기 위하여 알칼리금속 인산염 억제제로 인-몰리브덴산 나트륨(phosphorus-sodiummolybdate) 10∼100g과 물 1를 함유하는 전해질이 사용되며, 200∼400V의 정전압, 1∼5A/dm2의 애노드전류밀도(anode current density)에서 3 내지 5분의 스파크방전에 의한 전해과정에서 15∼30mkm 두께의 코팅을 얻게 해준다. 그러나, 이 방법의 결점은 수득되는 코팅이 얼룩지고 균일하지 않아 광택이 없고 경도 또한 충분히 않다는 점이다.From a technical point of view, the prior art in the field closest to the present invention is Soviet Union Republic Patent No. 964026. In this patent, 10 to 100 g of sodium-phosphate molybdate (phosphorus-sodium molybdate) and water 1 are used as alkali metal phosphate inhibitors to coat ceramic coatings of aluminum or aluminum alloys. An electrolyte containing is used, and a coating having a thickness of 15 to 30 mkm is obtained during electrolysis by a spark discharge of 3 to 5 minutes at a constant voltage of 200 to 400 V and an anode current density of 1 to 5 A / dm 2 . Do it. However, a drawback of this method is that the coating obtained is stained and uneven, which is not glossy and hard enough.
그러므로, 본 발명의 목적은 알루미늄 또는 알루미늄합금에 균일하고 보다 단단하며 광택성이 있는 세라킥 코팅을 달성하기에 적합한 전해질을 개발하는 것이다.Therefore, it is an object of the present invention to develop an electrolyte suitable for achieving a uniform, harder and more glossy ceraco coating on aluminum or an aluminum alloy.
상기한 목적을 달성하기 위한 본 발명에 의하면, 알루미늄 또는 알루미늄합금에 세라믹 코팅을 피복하기 위한 전해질로서 알칼리금속 인산염 억제제와 물을 함유하는 전해질이 제공된다.According to the present invention for achieving the above object, an electrolyte containing an alkali metal phosphate inhibitor and water as an electrolyte for coating a ceramic coating on aluminum or an aluminum alloy is provided.
본 발명에 따르는 전해질중에 억제제는 산성피로인산 나트륨(acid sodium pyrophosphate : Na4P2O7)과 실리플루오르화 나트륨(sodium silicofluoride : Na2SiF6) 또는 실리코 플루오르화 칼륨(potassium silicofluo-ride : K2SiF6)으로 구성되며, 상기 각 성분의 함량은 물 1중에 산성피로인산 나트륨 50∼80g과 실리코플루오르화 칼륨 또는 나트륨 0.1∼10g이다.In the electrolyte according to the present invention, the inhibitor is acid sodium pyrophosphate (Na 4 P 2 O 7 ) and sodium silicofluoride (Na 2 SiF 6 ) or silicopotassium fluoride (potassium silicofluo-ride: K 2 SiF 6 ), the content of each component is water 1 50 to 80 g of acidic pyrophosphate and 0.1 to 10 g of potassium silicofluoride or sodium.
상술한 바와 같은 본 발명에 의한 전해질을 사용하여 알루미늄 및 알루미늄합금에 세라믹 코팅을 피복하는 것은 물1중에 억제제로서 산성피로인산 나트륨 50∼80g과 실리코플루오르화 칼륨 또는 나트륨 0.1∼10g을 함유하는 전해질을 전해조에 넣고 알루미늄 또는 그 합금을 애노드로 하여 전해질내에 침지한 다음, 애노드전류밀도를 3∼5A/dm2로 하고 전압을 10∼15분 동안에 영(0)V에서 150∼210V까지 점차 증가시키면서 스파크 방전하는 것에 의해 수행하는 것이 바람직하다.Coating the ceramic coating on aluminum and aluminum alloy using the electrolyte according to the present invention as described above is water 1 An electrolyte containing 50 to 80 g of acidic pyrophosphate as an inhibitor and 0.1 to 10 g of potassium silicate fluoride or sodium as an inhibitor was placed in an electrolytic cell, immersed in the electrolyte with aluminum or an alloy thereof as an anode, and the anode current density was 3 to 5 A /. It is preferably carried out by spark discharge while setting the voltage to dm 2 and gradually increasing the voltage from zero (V) to 150 to 210 V for 10 to 15 minutes.
이하, 본 발명을 비한경적인 실시예의 방법으로 보다 상세히 설명하기로 한다.Hereinafter, the present invention will be described in more detail by way of non-limiting examples.
[실시예]EXAMPLE
균일성, 높은 경도 및 광택성을 갖는 세라믹 코팅된 알루미늄판을 제공하기 위하여, 알루미늄판을 애노드로 하여 전해질에 수용된 다음의 조성의 전해질에 침지하였다 :In order to provide a ceramic coated aluminum plate with uniformity, high hardness and glossiness, the aluminum plate was immersed in an electrolyte of the following composition contained in the electrolyte as an anode:
산성피로인산나트륨 ‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥50∼80gSodium Pyrophosphate ‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥
실리코플루오르화 칼륨 ‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥ 0.1∼10gPotassium silicate fluoride ‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥
물 ‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥1까지‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥ 1 Till
애노드전류밀도를 3∼5A/dm2로 하여 10∼15분 동안에 전압을 영(0)V에서 150∼210V까지 점차 승압시키면서 스파크 방전하여 알루미늄음극의 침지표면에 세라믹코팅막을 형성시켰다.With the anode current density of 3 to 5 A / dm 2 , a spark discharge was performed while gradually increasing the voltage from zero (V) to 150 to 210 V for 10 to 15 minutes to form a ceramic coating film on the immersion surface of the aluminum cathode.
결과는 세라믹 코팅은 평활하고 균일하며 광택이 있고, 높은 내식력과 표면경도를 갖는 것으로 나타났다.The results showed that the ceramic coating was smooth, uniform and glossy, with high corrosion resistance and surface hardness.
Claims (2)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019940014026A KR960011681B1 (en) | 1994-06-21 | 1994-06-21 | Ceramic coating electrolytes of aluminium or aluminium alloy metals |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019940014026A KR960011681B1 (en) | 1994-06-21 | 1994-06-21 | Ceramic coating electrolytes of aluminium or aluminium alloy metals |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| KR960001183A KR960001183A (en) | 1996-01-25 |
| KR960011681B1 true KR960011681B1 (en) | 1996-08-29 |
Family
ID=19385735
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR1019940014026A KR960011681B1 (en) | 1994-06-21 | 1994-06-21 | Ceramic coating electrolytes of aluminium or aluminium alloy metals |
Country Status (1)
| Country | Link |
|---|---|
| KR (1) | KR960011681B1 (en) |
-
1994
- 1994-06-21 KR KR1019940014026A patent/KR960011681B1/en active IP Right Grant
Also Published As
| Publication number | Publication date |
|---|---|
| KR960001183A (en) | 1996-01-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4668347A (en) | Anticorrosive coated rectifier metals and their alloys | |
| US4336113A (en) | Electrolytic graining of aluminum with hydrogen peroxide and nitric or hydrochloric acid | |
| ES8403170A1 (en) | Electroplating method. | |
| GB2071698A (en) | Electrolytic graining of aluminium | |
| EP0243473A1 (en) | Method of coating articles of magnesium and an electrolytic bath therefor | |
| AU604526B2 (en) | Zn-based composite-plated metallic material and plating method | |
| CA1224181A (en) | Electrolytic graining of aluminium in nitric acid and oxalic acid mixture | |
| US3616301A (en) | Process for the electrolytic formation of aluminum coatings on metallic surfaces in molten salt bath | |
| US6368467B1 (en) | Electro-plating plasma arc deposition process | |
| US4416972A (en) | Electrolytic graining of aluminum with nitric and boric acids | |
| US4324841A (en) | Lithographic substrates | |
| JPH0359149B2 (en) | ||
| US3207679A (en) | Method for electroplating on titanium | |
| KR960011681B1 (en) | Ceramic coating electrolytes of aluminium or aluminium alloy metals | |
| EP0624662A1 (en) | Method for direct plating of iron on aluminium | |
| US4171247A (en) | Method for preparing active cathodes for electrochemical processes | |
| US3785940A (en) | Method for electrolytically treating the surface of a steel plate with a chromate solution | |
| Skoulikidis et al. | Protection of Aluminium Alloys against Stress Corrosion Cracking in Saline Water by Properly Oriented Anodic Coatings I. Influence of anodising conditions: I. Influence of Anodising Conditions | |
| US4406757A (en) | Anodization method | |
| CN108441912A (en) | Aluminum alloy surface Al3C4-Al2O3-ZrO2The preparation method of wear-resisting composite coating | |
| US4855021A (en) | Method for electroplating a steel strip with a coating metal, in particular zinc or a zinc-containing alloy | |
| SU1200591A1 (en) | Method of coating metals and alloys | |
| US2437612A (en) | Process for electrolytically zinc plating magnesium and magnesium base alloys | |
| KR20070097895A (en) | Method for treating the surface of magnesium and its alloys | |
| US4400246A (en) | Process for applying barrier layer anodic coatings |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A201 | Request for examination | ||
| G160 | Decision to publish patent application | ||
| E701 | Decision to grant or registration of patent right | ||
| NORF | Unpaid initial registration fee |