JPH08296100A - Method for electropolishing ferritic stainless steel at high speed - Google Patents
Method for electropolishing ferritic stainless steel at high speedInfo
- Publication number
- JPH08296100A JPH08296100A JP10423495A JP10423495A JPH08296100A JP H08296100 A JPH08296100 A JP H08296100A JP 10423495 A JP10423495 A JP 10423495A JP 10423495 A JP10423495 A JP 10423495A JP H08296100 A JPH08296100 A JP H08296100A
- Authority
- JP
- Japan
- Prior art keywords
- stainless steel
- ferritic stainless
- electropolishing
- steel
- electrolytic polishing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Landscapes
- Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
- ing And Chemical Polishing (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、建材のような意匠用途
に使用されるフェライト系ステンレス鋼の表面光沢の向
上を図るために、極めて優れた表面光沢を短時間で得る
電解研磨方法を提供するものである。FIELD OF THE INVENTION The present invention provides an electrolytic polishing method for obtaining an extremely excellent surface gloss in a short time in order to improve the surface gloss of ferritic stainless steel used for design purposes such as building materials. To do.
【０００２】[0002]
【従来の技術】意匠用素材としてステンレス鋼を使用す
る場合、高級感を材料に持たせるために鋼帯表面の光沢
を向上させることは、非常に重要なセールスポイントと
なる。金属鋼帯の表面光沢を向上させるには、機械研磨
が一般的に用いられる方法であるが、広幅の金属鋼帯を
一様に鏡面化するように機械研磨を行うことは、作業効
率が低く、極めて困難な方法である。一方、金属表面の
光沢を向上させる方法として、特定の電解液中で金属自
身を陽極として一定時間電解するいわゆる電解研磨法が
知られている。2. Description of the Related Art When stainless steel is used as a design material, it is a very important selling point to improve the luster of the surface of the steel strip in order to give the material a high-grade feeling. Mechanical polishing is a commonly used method to improve the surface gloss of metal steel strips, but mechanical polishing so that a wide metal steel strip is uniformly mirror-finished results in low work efficiency. , A very difficult method. On the other hand, as a method for improving the gloss of the metal surface, a so-called electrolytic polishing method is known in which a metal itself is used as an anode in a specific electrolytic solution for electrolysis for a certain period of time.
【０００３】ＳＵＳ３０４鋼に代表されるオーステナイ
ト系ステンレス鋼に関しては、従来より建材に使用され
ているため、表面光沢を向上させる電解研磨液の検討が
詳細に行われており、大別すると現在までに、過塩素酸
性、燐酸系、硫酸系の電解研磨液が開発されており、一
般的には燐酸系の電解研磨液が使用されている。例えば
「PLATING AND SURFACE FINISHING,6,P42(1981) 」に
は、ステンレス鋼の電解研磨液として燐酸（４０〜６５
％）、硫酸（１５〜４５％）、水（残部）の溶液組成が
示されている。Regarding austenitic stainless steel represented by SUS304 steel, since it has been conventionally used for building materials, an electrolytic polishing solution for improving the surface gloss has been studied in detail. , Perchloric acid, phosphoric acid-based, and sulfuric acid-based electrolytic polishing liquids have been developed, and phosphoric acid-based electrolytic polishing liquids are generally used. For example, "PLATING AND SURFACE FINISHING, 6, P42 (1981)" states that phosphoric acid (40-65
%), Sulfuric acid (15-45%), and water (the balance).
【０００４】一方、ＳＵＳ４３０鋼に代表されるフェラ
イト系ステンレス鋼に関しては、価格的にはＳＵＳ３０
４鋼より安価であるものの、加工性に劣ることから建材
用途にはあまり使用されていなかった。そのため、フェ
ライト系ステンレス鋼については、電解研磨による表面
光沢の向上についてはあまり精力的に行われておらず、
上記溶液系においてフェライト系ステンレス鋼の電解研
磨が可能であるかどうかは明らかでなかった。On the other hand, the price of ferritic stainless steel represented by SUS430 steel is SUS30 in terms of price.
Although it is cheaper than 4 steel, it has not been used so much for building materials because of its poor workability. Therefore, for ferritic stainless steel, improvement of surface gloss by electropolishing has not been done vigorously,
It was not clear whether electropolishing of ferritic stainless steel was possible in the solution system.
【０００５】[0005]
【発明が解決しようとする課題】本発明者らは、上記燐
酸を主体とした電解研磨液系を用いてフェライト系ステ
ンレス鋼の電解研磨実験を実施したところ、ＳＵＳ３０
４鋼で得られるような美麗な表面を短時間で容易に得ら
れないことが判明した。そこで本発明者らは、特に電解
研磨液の液組成と電解研磨時の溶液温度、電解電流密度
に着目して鋭意検討した結果、電解研磨温度及び電解電
流密度を大幅に上昇させることによって目的とする表面
が得られることが判明した。本発明は、フェライト系ス
テンレス鋼を極めて美麗に短時間で電解研磨する方法を
開示するものである。The inventors of the present invention conducted electrolytic polishing experiments on ferritic stainless steels using the electrolytic polishing liquid system containing phosphoric acid as a main component.
It has been found that a beautiful surface like that obtained with No. 4 steel cannot be easily obtained in a short time. Therefore, the present inventors have conducted an earnest study focusing on the liquid composition of the electropolishing liquid and the solution temperature during electropolishing, and the electrolytic current density. It was found that a surface that does The present invention discloses a method of electrolytically polishing ferritic stainless steel in a very beautiful and short time.
【０００６】[0006]
【課題を解決するための手段】本発明者らは、フェライ
ト系ステンレス鋼を電解研磨するにあたって、電解研磨
方法を鋭意検討した結果、燐酸溶液系において、燐酸、
硫酸及び水濃度を規定すると共に、電解研磨を行う温度
及び電解電流密度を極めて高くすることにより、美麗な
表面を短時間で得られることを明らかにしたものであ
る。Means for Solving the Problems As a result of diligent studies on an electrolytic polishing method for electrolytic polishing ferritic stainless steel, the present inventors have found that phosphoric acid
It has been clarified that a beautiful surface can be obtained in a short time by defining the sulfuric acid and water concentrations and making the temperature for electrolytic polishing and the electrolytic current density extremely high.
【０００７】本発明は、上記知見に基づいて完成したも
のであって、重量％で、燐酸２０〜８０％、硫酸２０〜
７０％、水１０〜２０％含有し、かつ重クロム酸カリウ
ムを０．５〜１００ｇ／l 含有する溶液中で、フェライ
ト系ステンレス鋼を陽極とし、電解電流密度を１００Ａ
／dm2 以上５００Ａ／dm2 以下にすると共に、電解研磨
温度を９０℃〜１６０℃の温度域で電解研磨を行なうこ
とを特徴とする電解研磨方法である。The present invention has been completed on the basis of the above findings, and in terms of weight%, phosphoric acid 20 to 80% and sulfuric acid 20 to 20%.
In a solution containing 70% of water, 10 to 20% of water, and 0.5 to 100 g / l of potassium dichromate, a ferritic stainless steel was used as an anode, and an electrolytic current density was 100 A.
/ Dm 2 or more and 500 A / dm 2 or less, and electrolytic polishing is performed at an electrolytic polishing temperature of 90 ° C. to 160 ° C.
【０００８】[0008]
【作用】以下、本発明について詳細に説明する。本発明
では、燐酸及び硫酸の混合液を電解研磨液として用いて
いるが、燐酸は、電解研磨時にステンレス鋼表面に粘液
層を形成し、極めて美麗な電解研磨表面を得るのに不可
欠な溶液であるので、その含有量（重量％）は少なくと
も２０％以上は必要である。しかしながら燐酸濃度が８
０％を超える場合には、逆に電解研磨の効率すなわち、
同じ光沢を得るのに必要な電解量が著しく上昇するの
で、その上限を８０％とする。The present invention will be described in detail below. In the present invention, a mixed solution of phosphoric acid and sulfuric acid is used as the electropolishing solution, but phosphoric acid is an essential solution for forming a mucus layer on the surface of stainless steel during electropolishing and obtaining a very beautiful electropolishing surface. Therefore, its content (% by weight) must be at least 20% or more. However, the phosphoric acid concentration is 8
On the other hand, if it exceeds 0%, the efficiency of electropolishing, that is,
Since the amount of electrolysis required to obtain the same gloss increases remarkably, the upper limit is set to 80%.
【０００９】また硫酸は、電解研磨の効率を向上させる
のに極めて有効な作用を持っており、その含有量は少な
くとも２０％以上は必要となる。しかしながら７０％を
超える場合、硫酸の極めて強い腐食作用によって美麗な
電解研磨表面が得られなくなるため、その上限を７０％
とする。Sulfuric acid has a very effective action for improving the efficiency of electropolishing, and its content must be at least 20% or more. However, if it exceeds 70%, a beautiful electropolished surface cannot be obtained due to the extremely strong corrosive action of sulfuric acid, so the upper limit is 70%.
And
【００１０】また水は、伝導度を確保するするために不
可欠な溶媒であり、少なくとも１０％以上は必要であ
る。しかしながら２０％を超えると、水の電気分解に要
する電気量が増大し電解研磨の効率が低下するので、２
０％を上限とする。Water is an essential solvent for ensuring conductivity, and at least 10% or more is necessary. However, if it exceeds 20%, the amount of electricity required for the electrolysis of water increases and the efficiency of electrolytic polishing decreases, so 2
The upper limit is 0%.
【００１１】本発明では、この溶液に重クロム酸カリウ
ムを０．５ｇ／l 〜１００ｇ／l 添加する。重クロム酸
カリウムは、ステンレス鋼表面に薄い酸化物を形成さ
せ、結晶方位の違いに伴い溶解速度が変化し、表面光沢
が劣化することを防止するために添加するものであり、
少なくとも０．５ｇ／l 以上が必要となる。しかしなが
ら、１００ｇ／l を超えると研磨液の粘性が著しく上昇
し、良好な電解研磨表面を得られなくなるため、１００
ｇ/lを上限値とする。In the present invention, 0.5 g / l to 100 g / l of potassium dichromate is added to this solution. Potassium dichromate is added to form a thin oxide on the surface of stainless steel, change the dissolution rate according to the difference in crystal orientation, and prevent the surface gloss from deteriorating.
At least 0.5 g / l or more is required. However, when it exceeds 100 g / l, the viscosity of the polishing liquid remarkably increases, and a good electrolytic polishing surface cannot be obtained.
The upper limit is g / l.
【００１２】以上のような溶液組成に調合した溶液中で
電解研磨するに当たって、電解電流密度を１００Ａ／dm
2 以上５００Ａ／dm2 以下の条件で行う。電解電流密度
を１００Ａ／dm2 以上にするのは、陽極すなわちステン
レス鋼表面からの酸素ガス発生を均一とし、ステンレス
鋼表面に均一な酸化物層及び粘液層を形成し、表面の平
滑化をもたらすために必要となる。しかしながら電解電
流密度が５００Ａ／dm2 を超えると陽極金属表面からの
酸素発生が著しく促進され、表面での均一な酸化物層及
び粘液層の形成が阻害され、表面光沢が極端に劣化する
ので、５００Ａ／dm2 を上限とする。In electropolishing in a solution prepared as described above, the electrolytic current density is 100 A / dm.
Carried out in two or more 500A / dm 2 the following conditions. The electrolytic current density of 100 A / dm 2 or more makes the oxygen gas generation from the anode, that is, the stainless steel surface uniform, forms a uniform oxide layer and a mucus layer on the stainless steel surface, and causes the surface to be smooth. It is necessary for. However, when the electrolytic current density exceeds 500 A / dm 2 , oxygen generation from the anode metal surface is significantly promoted, formation of uniform oxide layer and mucus layer on the surface is hindered, and surface gloss is extremely deteriorated. The upper limit is 500 A / dm 2 .
【００１３】さらに本発明では、電解研磨を実施する温
度域を９０℃以上１６０℃以下で行うことによって、極
めて美麗で平坦度に優れた表面を得ることができる。電
解研磨温度を高温とすることにより、その表面光沢が顕
著に上昇するメカニズムについては不明であるが、電解
研磨温度を高温とすることで研磨液の粘性が低下するこ
とによって、電解研磨時に陽極のステンレス鋼表面に形
成される粘液層の厚さが薄くなる効果と、金属原子の溶
解反応が促進されることによって、美麗な表面が容易に
得られるものと推定される。しかしながら温度が１６０
℃を超える場合には、表面にピットが形成され表面光沢
が劣化するので、１６０℃を上限とする。Further, according to the present invention, by carrying out the electrolytic polishing at a temperature range of 90 ° C. or higher and 160 ° C. or lower, it is possible to obtain a very beautiful surface having excellent flatness. By increasing the electropolishing temperature to a high temperature, it is unknown how the surface gloss increases significantly.However, increasing the electropolishing temperature lowers the viscosity of the polishing liquid, which causes It is presumed that a beautiful surface can be easily obtained by the effect of reducing the thickness of the mucus layer formed on the surface of stainless steel and the promotion of the dissolution reaction of metal atoms. However, the temperature is 160
If the temperature exceeds ℃, pits are formed on the surface and the surface gloss deteriorates, so the upper limit is 160 ℃.
【００１４】[0014]
【実施例】ＳＵＳ４３０冷延鋼板（板厚０．４mm）を供
試材として、各種濃度の燐酸−硫酸−水−重クロム酸カ
リウム溶液中で電解研磨を行い、反射率測定計を用いて
表面光沢を測定した結果を表１に示す。表面光沢度は、
圧延方向に平行な方向と直角な方向から、鋼板表面に対
して４５度の入射角で光を鋼板に照射し、同じく４５度
の反射角で光を反射させた場合の平均値である。本法で
測定を行った場合、その値が８００を越えると鏡のよう
に美麗な表面であると考えられている。[Examples] Using SUS430 cold rolled steel sheet (sheet thickness 0.4 mm) as a test material, electrolytic polishing was performed in phosphoric acid-sulfuric acid-water-potassium dichromate solutions of various concentrations, and the surface was measured using a reflectometer. The results of gloss measurement are shown in Table 1. Surface gloss is
This is an average value when the steel sheet is irradiated with light at an incident angle of 45 degrees with respect to the surface of the steel sheet from a direction perpendicular to the direction parallel to the rolling direction and the light is reflected at a reflection angle of 45 degrees. When measured by this method, when the value exceeds 800, it is considered that the surface is as beautiful as a mirror.
【００１５】[0015]
【表１】 [Table 1]
【００１６】[0016]
【発明の効果】本発明により電解研磨を施したフェライ
ト系ステンレス冷延鋼板は美麗で、鏡面のような表面光
沢を呈しており、価格も３０４系より安く、建材等の意
匠用素材として用いるのに最適な素材である。EFFECTS OF THE INVENTION The electrolytically polished ferritic stainless cold-rolled steel sheet according to the present invention is beautiful, has a mirror-like surface gloss, and is cheaper than 304 series, and is used as a design material such as a building material. The best material for
Claims (1)
〜７０％、水１０〜２０％含有すると共に、溶液１リッ
トル当たり０．５ｇ〜１００ｇの重クロム酸カリウムを
含有する溶液中で、フェライト系ステンレス鋼を陽極と
し、電解電流密度を１００Ａ／dm2 以上５００Ａ／dm2
以下にすると共に、水溶液の温度を９０℃〜１６０℃の
間で電解研磨を行なうことを特徴とするフェライト系ス
テンレス鋼の高速電解研磨方法。1. By weight percent, phosphoric acid 20-80%, sulfuric acid 20
70%, while containing 10-20% water, the solution 1 in a solution containing potassium bichromate per liter 0.5G～100g, the ferritic stainless steel as the anode, the electrolysis current density 100A / dm 2 500A / dm 2 or more
In addition to the following, the method for high-speed electrolytic polishing of ferritic stainless steel is characterized in that electrolytic polishing is carried out at an aqueous solution temperature of 90 ° C to 160 ° C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10423495A JPH08296100A (en) | 1995-04-27 | 1995-04-27 | Method for electropolishing ferritic stainless steel at high speed |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10423495A JPH08296100A (en) | 1995-04-27 | 1995-04-27 | Method for electropolishing ferritic stainless steel at high speed |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH08296100A true JPH08296100A (en) | 1996-11-12 |
Family
ID=14375278
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10423495A Withdrawn JPH08296100A (en) | 1995-04-27 | 1995-04-27 | Method for electropolishing ferritic stainless steel at high speed |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH08296100A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2015074798A (en) * | 2013-10-08 | 2015-04-20 | 日新製鋼株式会社 | Ferritic stainless steel for lithium ion secondary battery electrolyte storage container and lithium ion secondary battery electrolyte storage container using the same |
-
1995
- 1995-04-27 JP JP10423495A patent/JPH08296100A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2015074798A (en) * | 2013-10-08 | 2015-04-20 | 日新製鋼株式会社 | Ferritic stainless steel for lithium ion secondary battery electrolyte storage container and lithium ion secondary battery electrolyte storage container using the same |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20020702 |