JPS6318100A - Surface treatment of stainless steel - Google Patents
Surface treatment of stainless steelInfo
- Publication number
- JPS6318100A JPS6318100A JP16032186A JP16032186A JPS6318100A JP S6318100 A JPS6318100 A JP S6318100A JP 16032186 A JP16032186 A JP 16032186A JP 16032186 A JP16032186 A JP 16032186A JP S6318100 A JPS6318100 A JP S6318100A
- Authority
- JP
- Japan
- Prior art keywords
- stainless steel
- acid
- steel
- aqueous solution
- corrosion resistance
- 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.)
- Pending
Links
- 229910001220 stainless steel Inorganic materials 0.000 title claims abstract description 29
- 239000010935 stainless steel Substances 0.000 title claims abstract description 28
- 238000004381 surface treatment Methods 0.000 title claims description 9
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims abstract description 18
- KRVSOGSZCMJSLX-UHFFFAOYSA-L chromic acid Substances O[Cr](O)(=O)=O KRVSOGSZCMJSLX-UHFFFAOYSA-L 0.000 claims abstract description 14
- AWJWCTOOIBYHON-UHFFFAOYSA-N furo[3,4-b]pyrazine-5,7-dione Chemical compound C1=CN=C2C(=O)OC(=O)C2=N1 AWJWCTOOIBYHON-UHFFFAOYSA-N 0.000 claims abstract description 14
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims abstract description 12
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims abstract description 6
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims abstract description 6
- 229910017604 nitric acid Inorganic materials 0.000 claims abstract description 6
- MEFBJEMVZONFCJ-UHFFFAOYSA-N molybdate Chemical compound [O-][Mo]([O-])(=O)=O MEFBJEMVZONFCJ-UHFFFAOYSA-N 0.000 claims abstract description 4
- 239000007864 aqueous solution Substances 0.000 claims description 20
- 238000000034 method Methods 0.000 claims description 20
- 238000011282 treatment Methods 0.000 claims description 13
- 239000002253 acid Substances 0.000 claims description 4
- 238000005260 corrosion Methods 0.000 abstract description 18
- 230000007797 corrosion Effects 0.000 abstract description 18
- 229910000831 Steel Inorganic materials 0.000 abstract description 8
- 239000010959 steel Substances 0.000 abstract description 8
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 abstract 2
- 230000002542 deteriorative effect Effects 0.000 abstract 1
- 238000002161 passivation Methods 0.000 description 7
- 238000012545 processing Methods 0.000 description 7
- RAHZWNYVWXNFOC-UHFFFAOYSA-N sulfur dioxide Inorganic materials O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- 238000005868 electrolysis reaction Methods 0.000 description 4
- 238000007654 immersion Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000007747 plating Methods 0.000 description 3
- 235000002639 sodium chloride Nutrition 0.000 description 3
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 238000003915 air pollution Methods 0.000 description 2
- 239000007798 antifreeze agent Substances 0.000 description 2
- AYTAKQFHWFYBMA-UHFFFAOYSA-N chromium dioxide Chemical compound O=[Cr]=O AYTAKQFHWFYBMA-UHFFFAOYSA-N 0.000 description 2
- 238000004040 coloring Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000011835 investigation Methods 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- VLAPMBHFAWRUQP-UHFFFAOYSA-L molybdic acid Chemical compound O[Mo](O)(=O)=O VLAPMBHFAWRUQP-UHFFFAOYSA-L 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- 239000011780 sodium chloride Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- -1 N02 ions Chemical class 0.000 description 1
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- 239000004115 Sodium Silicate Substances 0.000 description 1
- 230000002528 anti-freeze Effects 0.000 description 1
- 239000003518 caustics Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 150000004679 hydroxides Chemical class 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910000734 martensite Inorganic materials 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 1
- 229910052911 sodium silicate Inorganic materials 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
Landscapes
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明はステンレス鋼の耐発錆性を向上させる安価な表
面処理方法に関する。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an inexpensive surface treatment method for improving the rust resistance of stainless steel.
（従来技術）
ステンレス鋼はその優れた耐食性とともに、表面の美麗
さに大きな商品価値を有している。そのため従来より表
面外観維持のために特別の努力が払われている。(Prior Art) Stainless steel has great commercial value due to its excellent corrosion resistance and beautiful surface. Therefore, special efforts have traditionally been made to maintain surface appearance.
しかしステンレス鋼は大気汚染の進んだ地域や冬期に道
路に岩塩などの凍結防止剤を散布する地域で使用すると
大気中の腐食性物質（Ｓ０２〃ス、Ｎ０２イオン、Ｓ０
４イオンなど）や凍結防止剤により腐食され、外観が損
なわれるという問題があった。二のためかかる使用環境
に肘しては従来ステア・レス鋼素材の耐食性を向上させ
るとか、表面処理を施して耐食性を向上させるとかの対
策を講じてきた。However, if stainless steel is used in areas with advanced air pollution or where roads are sprayed with antifreeze agents such as rock salt in the winter, it will be exposed to corrosive substances (S02〃s, N02 ions, S02 ions, etc.) in the atmosphere.
4 ions, etc.) and antifreeze agents, resulting in a problem in that the appearance is impaired. In response to such usage environments, conventional measures have been taken such as improving the corrosion resistance of steerless steel materials or applying surface treatments to improve corrosion resistance.
前者の鋼索材の耐食性を向上させる方法として、従来一
般に採られている対策はＣｒ含有量の増加、Ｎｏ、 Ｃ
ｕなとの耐食性向上元素の添加など鋼組成を変更する方
法である。しかしこの方法は原料コストと製造コストの
−Ｌ昇を招き、ステンレス鋼が高価になってしまうもの
であった。As a method of improving the corrosion resistance of steel cables, the measures commonly taken in the past have been increasing the Cr content, No.
This is a method of changing the steel composition, such as adding elements that improve corrosion resistance such as u. However, this method causes an increase in raw material cost and production cost, making stainless steel expensive.
一方後者の表面処理による方法はＣｒめっきを施す方法
とステンレス鋼表面の不動態化皮膜を強化する方法で・
ある。Ｃｒめっき方法はステンレス鋼表面に金属Ｃｒを
電析させて耐食性を向上させる方法で、従来耐食性が十
分でない５ＵＳ４３０に利用されている。しかしこの方
法はめっきに数十Ａ／ｄＩ０２以上の大きな電流を必要
とし、しかも処理時間が長いため、処理コストが高くな
るという欠点があった。On the other hand, the latter surface treatment method involves applying Cr plating and strengthening the passivation film on the stainless steel surface.
be. The Cr plating method is a method of electrodepositing metal Cr on the surface of stainless steel to improve corrosion resistance, and is conventionally used for 5US430, which does not have sufficient corrosion resistance. However, this method requires a large current of several tens of A/dI02 or more for plating, and also has a long processing time, resulting in high processing costs.
また不動態化皮膜を強化する方法はＨＮＯ３、■２０２
、オゾンを含む酸化性の水溶液で処理する方法やクロム
酸、酸化マグネシウム、ケイ酸ソーダ、リン酸、モリブ
デン酸などを含む水溶液中で陰極若くは陽極電解する方
法などが行なわれていたが、いずれの方法も耐食性が不
十分であったり、表面の光沢が低下したりして、品質が
劣ってしまうという問題があった。In addition, the method to strengthen the passivation film is HNO3, ■202
Methods such as treatment with an oxidizing aqueous solution containing ozone, or cathodic or anodic electrolysis in an aqueous solution containing chromic acid, magnesium oxide, sodium silicate, phosphoric acid, molybdic acid, etc., have been used. This method also had the problem of poor quality due to insufficient corrosion resistance and reduced surface gloss.
（発明が解決しようとする問題点）
本発明は従来のステンレス鋼の耐食性を向上させる方法
の場合上記のように価格を上昇させたり、品質も低下さ
せてしまうものであったことから安価で、品質も低下さ
せないステンレス鋼の表面処理法を提供するものである
。(Problems to be Solved by the Invention) The present invention is inexpensive, as the conventional method for improving the corrosion resistance of stainless steel increases the price and reduces the quality as described above. The present invention provides a method for surface treatment of stainless steel that does not reduce quality.
（問題点を解決するための手段）
本発明者らは安価で、品質を低下させないステンレス鋼
の表面処理法を開発すべく種々検討した結果、まずステ
ンレス鋼をクロム酸一硫酸の混合水溶液中で浸漬処理し
、次にクロム酸を含む水溶液中で陰極電解処理を行う２
段処理による方法を開発したのである。すなわち本発明
者らはステンレス鋼をクロム酸一硫酸の混合水溶液中で
浸漬処理した後、クロム酸に硫酸、リン酸、硝酸、モリ
ブデン酸塩のうちの１種若くは２種以上を添加した水溶
液中にて５Ａ／ｄ１１２以下の低電流密度で陰極電解処
理することを特徴とするステンレス鋼の表面処理処理方
法を開発した。(Means for Solving the Problems) The present inventors conducted various studies to develop a surface treatment method for stainless steel that is inexpensive and does not reduce quality. Immersion treatment followed by cathodic electrolysis treatment in an aqueous solution containing chromic acid 2
They developed a method using stage processing. That is, the present inventors immersed stainless steel in a mixed aqueous solution of chromic acid and monosulfuric acid, and then prepared an aqueous solution in which one or more of sulfuric acid, phosphoric acid, nitric acid, and molybdate were added to chromic acid. We have developed a method for surface treatment of stainless steel, which is characterized by cathodic electrolytic treatment at a low current density of 5 A/d112 or less.
以下本発明の詳細な説明する。The present invention will be explained in detail below.
本発明ではまず第１工程として、ステンレス鋼をクロム
酸一硫酸の混合水溶液中で処理して、表面の不動態化皮
膜を一度溶解するとともに、発錆の起点となるＭ ｎ
Ｓなどの非金属介在物をも溶解し、再度不動態化皮膜を
形成するのである。この処理は混合水溶液のクロム酸（
ＣｒＯ２）濃度を１００９７Ｃ以上、硫酸濃度を３００
９／、ｇ以上にして、水溶液温度５０℃以上で、水溶液
温度に応じて２〜６０分浸漬することにより行う。この
処理により再形成される皮膜の厚さが厚くなりすぎると
皮膜は濃いブルーに着色される。このため着色を好まな
い場合には着色される直前にステンレス鋼を混合水溶液
より引き上げる。この引き上げるタイミングとしては予
めｊＲ合氷水溶液濃度および温度による浸漬時間を把握
しておき、その時間になったら引き１〕げろようにする
か、または混合水溶液でのステンレス鋼の自然電極電位
を観察して、電位が所定電位になったら引き上げるよう
にすればよい。後者の自然電極電位により引き上げタイ
ミングが把握できるのは次の理由によるものである。In the first step of the present invention, stainless steel is treated in a mixed aqueous solution of chromic acid and monosulfuric acid to once dissolve the passivation film on the surface and remove Mn, which is the starting point of rusting.
Non-metallic inclusions such as S are also dissolved and a passivation film is formed again. This treatment consists of a mixed aqueous solution of chromic acid (
CrO2) concentration is 10097C or more, sulfuric acid concentration is 300
9/g or more, and immersion is carried out at an aqueous solution temperature of 50° C. or more for 2 to 60 minutes depending on the aqueous solution temperature. If the thickness of the film re-formed by this treatment becomes too thick, the film will be colored deep blue. For this reason, if coloring is not desired, the stainless steel is pulled out of the mixed aqueous solution immediately before it is colored. As for the timing of pulling up, you should know in advance the immersion time depending on the concentration and temperature of the jR mixed ice aqueous solution, and when that time comes, pull it up (1), or observe the natural electrode potential of the stainless steel in the mixed aqueous solution. Then, when the potential reaches a predetermined potential, the potential can be raised. The reason why the raising timing can be determined based on the latter natural electrode potential is as follows.
１なわち混合水溶液に侵されない参照電極（例えば白金
）を混合水溶液中に浸漬して、この電極とステンレス鋼
とを接続すると、ステンレス鋼の自然電極電位は不動態
化皮膜の厚さに対応して添付図面に示すように変化し、
Ａ点で不動態化皮膜が急激に厚くなって着色する。従っ
て電位がＡ点になる直前にステンレス鋼を引き上げれば
着色されないようにすることができる。1. That is, when a reference electrode (for example, platinum) that is not attacked by the mixed aqueous solution is immersed in the mixed aqueous solution and this electrode is connected to stainless steel, the natural electrode potential of the stainless steel corresponds to the thickness of the passivation film. changes as shown in the attached drawings,
At point A, the passivation film suddenly becomes thicker and becomes colored. Therefore, if the stainless steel is pulled up just before the potential reaches point A, it can be prevented from being colored.
以上のようにして不動態化皮膜を形成したなら、次に第
２工程として、クロム酸に硫酸、リン酸、硝酸、モリブ
デン酸塩のうちの１種若くは２種以上を添加した水溶液
中にて低電流密度で陰極電解処理し、ステンレス鋼表面
にＣｒ”若くはＣｒ２＋の水酸化物を析出させる。この
陰極電解処理は水溶液のクロム酸濃度を１００９７ｅ以
上、硫酸、リン酸、硝酸、モリブデン酸塩濃度を１１５
０ ｍｏｌ／８〜１／２００１ＩＩｏｌ／Ｃにして、０
．１〜５．０Ａ ／ｄｍ２の低電流密度で好ましくは３
〜１０分行う。電流密度を５．ＯＡ／ｄＩ１１２より大
きくすると金属Ｃｒが析出しやすくなり、表面外観が変
化してしまう。電解量は１〜５Ａ・ＩＩ＋１１１／ｄＩ
１１２が最も好ましい。これは電解量がＩＡ−１６ｉｎ
／ｄａ＋２未満であると処理効果が小さく、５Ａ−ＩＩ
ｌｉ１１／ｄＩＩ＋２より大きくなると処理時間、消費
電力が大きくなり、経済的でないばかりか耐食性も低下
する傾向がある。Once the passivation film has been formed as described above, the second step is to add one or more of sulfuric acid, phosphoric acid, nitric acid, and molybdate to chromic acid in an aqueous solution. This cathodic electrolytic treatment is performed at a low current density to precipitate hydroxides of Cr" or Cr2+ on the stainless steel surface. This cathodic electrolytic treatment is performed by increasing the concentration of chromic acid in the aqueous solution to 10097e or higher, sulfuric acid, phosphoric acid, nitric acid, or molybdic acid. Salt concentration 115
0 mol/8 to 1/2001IIol/C, 0
．． At a low current density of 1 to 5.0 A/dm2, preferably 3
Do this for ~10 minutes. The current density is 5. When the OA/dI is larger than 112, metal Cr tends to precipitate and the surface appearance changes. The amount of electrolysis is 1-5A・II+111/dI
112 is most preferred. This has an electrolytic amount of IA-16in.
If it is less than /da+2, the treatment effect will be small, and 5A-II
When it is larger than li11/dII+2, processing time and power consumption increase, which is not only uneconomical but also tends to lower corrosion resistance.
この本発明の表面処理法はステンレス鋼がオーステナイ
ト系、フェライト系、マルテンサイト系など鋼種に関係
なく一殻にＣｒを１２ｗｔ％以上含有するのものであれ
ば適用でき、またパンチ式または連続的に行っても耐食
性を向−１ニさせることができる。The surface treatment method of the present invention can be applied to stainless steels that contain 12 wt% or more of Cr in one shell, regardless of the type of steel, such as austenitic, ferritic, or martensitic. Even if this is done, the corrosion resistance can be improved by -1.
次に実施例により本発明を具体的に説明するが、本発明
はこれに限定されるものではない。EXAMPLES Next, the present invention will be specifically explained with reference to Examples, but the present invention is not limited thereto.
（実施例）
実施例ｌ
５ＵＳ３０４．５ＵＳ４３０のＢＡ材切切板第１表に示
す第１工程、第２工程の条件で処理して、外観の調査と
耐食性試験を行った。調査および試験結果を第１表に処
理条件と対応させて示す。(Example) Example 1 A cut plate of BA material of 5US304.5US430 was processed under the conditions of the first step and second step shown in Table 1, and the appearance was investigated and the corrosion resistance test was conducted. The investigation and test results are shown in Table 1 in correspondence with the processing conditions.
なお調査、試験は次の要領で行った。The investigation and test were conducted in the following manner.
（１）外観調査
処理前後の外観を比較し、変化しないものを○、着色さ
れたり表面がエツチングされて光沢の低下したものをＸ
で評価した。(1) Appearance survey Compare the appearance before and after treatment, ○ indicates that there is no change, and X indicates that the gloss has decreased due to coloring or etching on the surface.
It was evaluated by
（２）耐食性試験
（イ）孔食電位
ＪＩＳに規定されたステンレス鋼の孔食電位測定方法に
従って測定した。溶液は５％食塩水とし、２００μＡ／
ｃ１１１２における電位（Ｖ）で表わし、この電位が大
きい程耐食性が良好であると判断した。(2) Corrosion resistance test (a) Pitting potential Measured according to the method for measuring pitting potential of stainless steel stipulated in JIS. The solution is 5% saline, 200μA/
It was expressed as a potential (V) at c1112, and it was judged that the higher the potential, the better the corrosion resistance.
（ロ）亜硫酸がス試験
８時間噴霧１６時間乾燥のサイクルを繰返し行い、腐食
面積率５％未満のものを○、５％以上１０％未満のもの
をΔ、１０％以上のものを×で評価した。(b) Sulfur dioxide test Repeat the cycle of 8-hour spraying and 16-hour drying, and evaluate the corrosion area rate as ○ if it is less than 5%, Δ if it is 5% or more and less than 10%, and × if it is 10% or more. did.
実施例２
板厚０．４論論の５ＵＳ３０４Ｂ Ａ材銅帯を１２表の
条件で処理した。処理工程は次の通りである。Example 2 A 5US304B A-material copper strip with a plate thickness of 0.4 was processed under the conditions shown in Table 12. The processing steps are as follows.
アンコイラ−→第１工程→水洗→第２工程→水洗→乾燥
→リコイラー
第２表
以上のようにして処理したステンレス鋼鋼帯の外観は処
理前の状態と同じで、光沢の低下、着色などは認められ
なかった。また実施例１と同要領で測定した孔食電位は
１，２０Ｖで、亜硫酸ガス試験での錆発生はなかった。Uncoiler → 1st process → Water washing → 2nd process → Water washing → Drying → Recoiler I was not able to admit. Further, the pitting potential measured in the same manner as in Example 1 was 1.20 V, and no rust occurred in the sulfur dioxide gas test.
（効果）
以上のように本発明は水溶液の使用薬品として安価な薬
品を使用するものであり、かつ陰極電解も低電流密度で
よいので、処理費は安価である。(Effects) As described above, the present invention uses inexpensive chemicals as chemicals in the aqueous solution, and the cathode electrolysis can also be carried out at low current density, so the processing cost is low.
また処理後の製品は処理前の外観を検札たい場合には処
理前の外観に保つことができ、しかもその外観で耐食性
も優れている。従って大気汚染が進んだ地域や道路に凍
結防止剤を散布する地域に使用しても、ステンレス鋼の
外観を長期間保つことができる。In addition, the appearance of the product after treatment can be maintained when the appearance before treatment is to be inspected, and furthermore, the appearance has excellent corrosion resistance. Therefore, the appearance of stainless steel can be maintained for a long time even when used in areas with advanced air pollution or areas where roads are sprayed with antifreeze.
添付図面はクロム酸一硫酸混合水溶液にステンレス鋼を
浸漬した場合のステンレス鋼自然電極電位を示すグラフ
である。The attached drawing is a graph showing the natural electrode potential of stainless steel when the stainless steel is immersed in a mixed aqueous solution of chromic acid and monosulfuric acid.
Claims (1)
理した後、クロム酸に硫酸、リン酸、硝酸、モリブデン
酸塩のうちの１種若くは２種以上を添加した水溶液中に
て５Ａ／ｄｍ＾２以下の低電流密度で陰極電解処理する
ことを特徴とするステンレス鋼の表面処理方法。After immersing stainless steel in a mixed aqueous solution of chromic acid and monosulfuric acid, it was immersed at 5 A/d in an aqueous solution in which one or more of sulfuric acid, phosphoric acid, nitric acid, and molybdate was added to chromic acid. A method for surface treatment of stainless steel characterized by cathodic electrolytic treatment at a low current density of ^2 or less.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16032186A JPS6318100A (en) | 1986-07-08 | 1986-07-08 | Surface treatment of stainless steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16032186A JPS6318100A (en) | 1986-07-08 | 1986-07-08 | Surface treatment of stainless steel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6318100A true JPS6318100A (en) | 1988-01-25 |
Family
ID=15712430
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16032186A Pending JPS6318100A (en) | 1986-07-08 | 1986-07-08 | Surface treatment of stainless steel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6318100A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1231296A2 (en) * | 2001-02-09 | 2002-08-14 | Henkel Corporation | Composition and process for etching and desmutting aluminum and its alloys |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5546476A (en) * | 1978-09-30 | 1980-04-01 | Matsushita Electric Works Ltd | Plane heater |
| JPS564151A (en) * | 1979-06-22 | 1981-01-17 | Minolta Camera Co Ltd | Electrophotographic receptor |
| JPS5624040A (en) * | 1979-08-04 | 1981-03-07 | Mitsubishi Paper Mills Ltd | Microcapsule |
| JPS5847478A (en) * | 1981-09-14 | 1983-03-19 | Kureha Chem Ind Co Ltd | Sterilization of food with ultraviolet radiation |
-
1986
- 1986-07-08 JP JP16032186A patent/JPS6318100A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5546476A (en) * | 1978-09-30 | 1980-04-01 | Matsushita Electric Works Ltd | Plane heater |
| JPS564151A (en) * | 1979-06-22 | 1981-01-17 | Minolta Camera Co Ltd | Electrophotographic receptor |
| JPS5624040A (en) * | 1979-08-04 | 1981-03-07 | Mitsubishi Paper Mills Ltd | Microcapsule |
| JPS5847478A (en) * | 1981-09-14 | 1983-03-19 | Kureha Chem Ind Co Ltd | Sterilization of food with ultraviolet radiation |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1231296A2 (en) * | 2001-02-09 | 2002-08-14 | Henkel Corporation | Composition and process for etching and desmutting aluminum and its alloys |
| EP1231296A3 (en) * | 2001-02-09 | 2003-08-13 | Henkel Corporation | Composition and process for etching and desmutting aluminum and its alloys |
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