JP2019119908A - Electrolytic polishing liquid for stainless steel - Google Patents
Electrolytic polishing liquid for stainless steel Download PDFInfo
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Abstract
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本発明は、ステンレス鋼用電解研磨液に関する。 The present invention relates to an electrolytic polishing solution for stainless steel.
ステンレス鋼に溶接を施すと、その溶接部分に「溶接焼け」と呼ばれる酸化スケール（溶接スケール）が発生する。この溶接スケールは種々のトラブル要因となるため除去する必要がある。溶接スケールを除去する方法としては、物理的研磨法、化学的研磨法及び電解研磨法が知られているが、なかでも、溶接スケールの除去性能に優れる電解研磨法が広く採用されている。電解研磨法は、陽極としてのステンレス鋼母材を正極に接続し、陰極を負極に接続して、陽極と陰極との間に電解液を介在させて両極間に電流を通電することにより、ステンレス鋼表面に生じた溶接スケールを除去する方法である。 When a stainless steel is welded, an oxide scale (weld scale) called "welding burn" is generated in the welded portion. The weld scale needs to be removed because it causes various troubles. As a method of removing weld scale, physical polishing method, chemical polishing method and electropolishing method are known, and among them, electropolishing method which is excellent in the removal performance of weld scale is widely adopted. In the electrolytic polishing method, a stainless steel base material as an anode is connected to a positive electrode, the cathode is connected to a negative electrode, an electrolytic solution is interposed between the anode and the cathode, and current is applied between the two electrodes. It is a method of removing the weld scale which arose on the steel surface.
この電解研磨法に用いられる電解液は、酸性電解液及び中性電解液に大別される。このうち、中性電解液は、酸性電解液と比較すると処理速度が遅いため、近年、種々の酸性電解液が提案されている。なかでも、近年の工業界においては、リン酸を主成分とする酸性電解液が多く使用されている。これは、リン酸が、他の酸に対して取扱い性が比較的良好な弱酸であるためである。このようなリン酸を主成分とする酸性電解液を用いた電解研磨方法としては、交流電流法、直流電流法及び交直重畳電流法が知られており、なかでも、処理速度が速いことから、交流電流法又は交直重畳電流法が多用されている。しかしながら、このリン酸を酸性電解液として使用し、交流電流法又は交直重畳電流法により電解研磨処理を行うと、不溶性のリン酸鉄塩が生成され、ステンレス鋼の表面処理部分が白濁化してしまう。 The electrolytic solution used in this electrolytic polishing method is roughly classified into an acidic electrolytic solution and a neutral electrolytic solution. Among these, since the processing speed of the neutral electrolyte is slower than that of the acidic electrolyte, various acidic electrolytes have been proposed in recent years. Among them, in recent industry, an acidic electrolytic solution mainly composed of phosphoric acid is often used. This is because phosphoric acid is a weak acid which has relatively good handleability to other acids. As an electropolishing method using such an acidic electrolytic solution containing phosphoric acid as a main component, an alternating current method, a direct current method and an AC / DC superimposed current method are known, and among them, since the processing speed is fast, The alternating current method or the AC / DC superimposed current method is widely used. However, when this phosphoric acid is used as an acidic electrolytic solution and electrolytic polishing is carried out by an alternating current method or an alternating current alternating current method, an insoluble phosphate iron salt is formed, and the surface treated portion of stainless steel becomes clouded. .
本発明は、このような課題を解決しようとするものであり、リン酸を主成分とする電解研磨液を使用して交流電流法又は交直重畳電流法により電解研磨処理を行った場合の白濁化を抑制することを目的とする。 The present invention is intended to solve such problems, and causes white turbidity when the electropolishing treatment is performed by an alternating current method or an alternating current superimposed current method using an electrolytic polishing solution containing phosphoric acid as a main component. To reduce
本発明者らは、上記した目的を達成すべく鋭意研究を重ねてきた。その結果、リン酸とホスホン酸化合物又はその塩とを含有する電解研磨液を用いて交流電流法又は交直重畳電流法により電解研磨処理する場合には上記の課題を解決できることを見出した。この知見に基づいて更に研究を重ね本発明を完成した。即ち、本発明は、以下の構成を包含する。
項１．交流電流法又は交直重畳電流法によりステンレス鋼を電解研磨処理するための電解研磨液であって、
リン酸と、ホスホン酸化合物又はその塩とを含有する、ステンレス鋼用電解研磨液。
項２．前記リン酸の含有量が20〜80質量%であり、前記ホスホン酸化合物又はその塩の含有量が0.5質量%以上である、項１に記載のステンレス鋼用電解研磨液。
項３．さらに、硫酸カリウムを含有する、項１又は２に記載のステンレス鋼用電解研磨液。
項４．さらに、ゲル化剤を含有する、項１〜３のいずれか1項に記載のステンレス鋼用電解研磨液。
項５．酸性である、項１〜４のいずれか1項に記載のステンレス鋼用電解研磨液。
項６．ステンレス鋼表面の溶接スケール除去用である、項１〜５のいずれか1項に記載のステンレス鋼用電解研磨液。
項７．項１〜６のいずれか1項に記載のステンレス鋼用電解研磨液を用いて電解する、ステンレス鋼の電解研磨方法。
項８．表面の白濁化が抑制されたステンレス鋼の製造方法であって、
項１〜６のいずれか1項に記載のステンレス鋼用電解研磨液を用いて電解する、製造方法。
The present inventors have intensively researched to achieve the above-mentioned purpose. As a result, it has been found that the above-mentioned problems can be solved in the case where electrolytic polishing treatment is carried out by an alternating current method or an AC / DC superimposed current method using an electrolytic polishing solution containing phosphoric acid and a phosphonic acid compound or a salt thereof. Based on this finding, further studies were conducted to complete the present invention. That is, the present invention includes the following configurations.
Item 1. An electrolytic polishing liquid for electrolytic polishing treatment of stainless steel by an alternating current method or an alternating current direct current method,
An electrolytic polishing solution for stainless steel, containing phosphoric acid and a phosphonic acid compound or a salt thereof.
Item 2. The electrolytic polishing solution for stainless steel according to Item 1, wherein the content of the phosphoric acid is 20 to 80% by mass, and the content of the phosphonic acid compound or a salt thereof is 0.5% by mass or more.
Item 3. The electrolytic polishing solution for stainless steel according to Item 1 or 2, further containing potassium sulfate.
Item 4. The electrolytic polishing solution for stainless steel according to any one of Items 1 to 3, further containing a gelling agent.
Item 5. The electrolytic polishing liquid for stainless steel according to any one of Items 1 to 4, which is acidic.
Item 6. The electrolytic polishing solution for stainless steel according to any one of Items 1 to 5, which is for removing weld scale on a stainless steel surface.
Item 7. The electrolytic polishing method of stainless steel electrolyzed using the electrolytic polishing liquid for stainless steels of any one of claim | item 1 -6.
Item 8. A method for producing stainless steel in which surface clouding is suppressed,
The manufacturing method electrolyzed using the electrolytic polishing liquid for stainless steel of any one of claim | item 1 -6.
本発明によれば、リン酸を主成分とする電解研磨液を使用して交流電流法又は交直重畳電流法により電解研磨処理を行った場合の白濁化を抑制することができる。 According to the present invention, it is possible to suppress white turbidity when the electrolytic polishing treatment is performed by an alternating current method or an AC-DC superimposed current method using an electrolytic polishing solution containing phosphoric acid as a main component.
本発明の電解研磨液は、交流電流法又は交直重畳電流法によりステンレス鋼を電解研磨処理するための電解研磨液であって、リン酸と、ホスホン酸化合物又はその塩とを含有する。このような構成を採用することにより、溶接スケールの除去性能を十分に維持しつつもステンレス鋼表面の白濁化を効果的に抑制することができる。 The electropolishing liquid of the present invention is an electropolishing liquid for electropolishing stainless steel by an alternating current method or an AC / DC superimposed current method, and contains phosphoric acid and a phosphonic acid compound or a salt thereof. By employing such a configuration, it is possible to effectively suppress the clouding of the stainless steel surface while sufficiently maintaining the removal performance of the weld scale.
（１）リン酸
リン酸を使用することで、ステンレス鋼の表面に発生した溶接スケールを溶解する力を向上させることができる。
(1) Phosphoric Acid The use of phosphoric acid can improve the ability to dissolve weld scale generated on the surface of stainless steel.
リン酸としては、特に制限はなく、ピロリン酸、オルトリン酸、メタリン酸、亜リン酸、メタ亜リン酸、次リン酸、次亜リン酸、トリポリリン酸、テトラリン酸、ヘキサリン酸、トリメタリン酸、ピロ亜リン酸等が挙げられる。これらのリン酸は、単独で用いることもでき、2種以上を組合せて使用することもできる。 There is no particular limitation on phosphoric acid, and pyrophosphoric acid, orthophosphoric acid, metaphosphoric acid, phosphorous acid, metaphosphorous acid, hypophosphoric acid, hypophosphorous acid, tripolyphosphoric acid, tetraphosphoric acid, hexaphosphoric acid, trimetaphosphoric acid, pyrolic acid Phosphorous acid etc. are mentioned. These phosphoric acids can be used alone or in combination of two or more.
本発明の電解研磨液中のリン酸の含有量は、20〜80質量%が好ましく、25〜75質量%がより好ましい。なお、リン酸の含有量は、使用するリン酸の種類によって若干異なり、例えば、ピロリン酸を使用する場合は20〜75質量%（特に30〜70質量%）が好ましく、オルトリン酸を使用する場合は20〜75質量%（特に30〜75質量%）が好ましい。なお、ピロリン酸は加水分解するとオルトリン酸になるため、上記の含有量において、ピロリン酸の含有量は、オルトリン酸に換算した場合の含有量である。また、2種以上のリン酸を使用する場合、その合計含有量が上記範囲となるように調整することが好ましい。リン酸の含有量をこの範囲とすることにより、電解研磨処理により、ステンレス鋼表面に発生した溶接スケールをより十分に除去することができる。 20-80 mass% is preferable, and, as for content of the phosphoric acid in the electropolishing liquid of this invention, 25-75 mass% is more preferable. The content of phosphoric acid slightly differs depending on the type of phosphoric acid used. For example, in the case of using pyrophosphoric acid, 20 to 75% by mass (particularly 30 to 70% by mass) is preferable, and in the case of using orthophosphoric acid 20-75 mass% (especially 30-75 mass%) is preferable. In addition, since pyrophosphoric acid will become orthophosphoric acid when it hydrolyzes, in said content, content of pyrophosphoric acid is content when converting into orthophosphoric acid. Moreover, when using 2 or more types of phosphoric acid, it is preferable to adjust so that the total content may become the said range. By setting the content of phosphoric acid in this range, it is possible to more sufficiently remove the weld scale generated on the stainless steel surface by the electrolytic polishing process.
（２）ホスホン酸化合物又はその塩
本発明において使用するホスホン酸化合物又はその塩は、金属イオンを捕捉するホスホン酸系キレート剤としての機能を有する。
(2) Phosphonic Acid Compound or Salt Thereof The phosphonic acid compound or a salt thereof used in the present invention has a function as a phosphonic acid chelating agent for capturing metal ions.
ステンレス鋼母材を陽極として交流電流法又は交直重畳電流法により電解研磨処理を行うと、陽極のステンレス鋼に含まれる鉄が電解液中に溶出する際に、その鉄がイオン化する。このイオン化した鉄が、電解研磨液中のリン酸イオンと反応すると、不溶性のリン酸鉄塩が生成され、これにより、ステンレス鋼表面が白濁化する。なお、交流電流法又は交直重畳電流法においてホスホン酸化合物又はその塩を使用すると、鉄イオンを十分に捕捉して不活性化させることによって、電解研磨液中のリン酸イオンと鉄イオンとが反応してリン酸鉄塩が生成することを抑制するため、ステンレス鋼表面の白濁化を抑制することができる。ホスホン酸化合物又はその塩は、リン酸溶液中において安定性が高く、リン酸溶液に対する溶解性が高いため、溶液中で経時劣化することなく、ステンレス鋼の表面白濁化防止効果を維持することができる。 When electrolytic polishing is performed using an stainless steel base material as an anode by an alternating current method or an AC / DC superimposed current method, when iron contained in the stainless steel of the anode is eluted into the electrolytic solution, the iron is ionized. When this ionized iron reacts with phosphate ions in the electropolishing liquid, an insoluble iron phosphate is formed, whereby the surface of the stainless steel becomes clouded. When a phosphonic acid compound or a salt thereof is used in an alternating current method or an alternating current superimposed current method, phosphate ions and iron ions in the electropolishing liquid react with each other by sufficiently capturing and deactivating iron ions. Then, since the formation of iron phosphate is suppressed, the clouding of the stainless steel surface can be suppressed. The phosphonic acid compound or a salt thereof has high stability in phosphoric acid solution and high solubility in phosphoric acid solution, so that the surface white turbidity preventing effect of stainless steel can be maintained without deterioration with time in the solution. it can.
このようなホスホン酸化合物又はその塩としては、具体的には、ニトリロトリス（メチレンホスホン酸）、1-ヒドロキシエチリデン-1,1-ジホスホン酸、2-ホスホノブタン-1,2,4-トリカルボン酸、エチレンジアミンテトラキスメチレンホスホン酸等のホスホン酸化合物や、これらの塩が挙げられる。なかでも、白濁化防止機能、酸性水溶液中での溶解度等の観点から、ニトリロトリスメチレンホスホン酸、1-ヒドロキシエチリデン-1,1-ジホスホン酸等やその塩が好ましい。これらホスホン酸化合物の塩としては、アルカリ金属塩、アルカリ土類金属塩、アンモニウム塩等が挙げられ、カリウム塩、ナトリウム塩、マグネシウム塩、カルシウム塩、アンモニウム塩等が挙げられる。また、これらの水和物を用いることも可能である。なお、酸性水溶液中での溶解度があまり高くない化合物を使用する場合は、ホスホン酸化合物の塩を使用することが好ましい。これらは単独で用いることもでき、2種以上を組合せて用いることもできる。 As such a phosphonic acid compound or a salt thereof, specifically, nitrilotris (methylene phosphonic acid), 1-hydroxyethylidene-1,1-diphosphonic acid, 2-phosphonobutane-1,2,4-tricarboxylic acid, Phosphonic acid compounds such as ethylene diamine tetrakis methylene phosphonic acid and salts thereof are mentioned. Among them, nitrilotris methylene phosphonic acid, 1-hydroxyethylidene-1,1-diphosphonic acid and the like and salts thereof are preferable from the viewpoint of the function of preventing whitening, solubility in an acidic aqueous solution and the like. Examples of salts of these phosphonic acid compounds include alkali metal salts, alkaline earth metal salts, ammonium salts and the like, and potassium salts, sodium salts, magnesium salts, calcium salts, ammonium salts and the like. It is also possible to use these hydrates. In addition, when using the compound whose solubility in an acidic aqueous solution is not very high, it is preferable to use the salt of a phosphonic acid compound. These can be used alone or in combination of two or more.
本発明の電解研磨液中のホスホン酸化合物又はその塩の含有量は、0.5質量%以上が好ましい。ホスホン酸化合物又はその塩の含有量をこの範囲とすることにより、電解研磨処理中に鉄イオンをより効果的に捕捉することができ、不溶性のリン酸鉄塩の生成をより抑制することができる結果、溶接スケール除去時のステンレス鋼表面の白濁化をより抑制することができる。なお、ホスホン酸化合物又はその塩の含有量の上限値は特に制限はないが、通常、30質量%程度である。 As for content of the phosphonic acid compound or its salt in the electropolishing liquid of this invention, 0.5 mass% or more is preferable. By setting the content of the phosphonic acid compound or its salt in this range, it is possible to capture iron ions more effectively during the electropolishing treatment and to further suppress the formation of insoluble iron phosphate. As a result, it is possible to further suppress the clouding of the stainless steel surface at the time of welding scale removal. The upper limit of the content of the phosphonic acid compound or a salt thereof is not particularly limited, but is usually about 30% by mass.
（３）電解研磨液
本発明の電解研磨液には、上記したリン酸と、ホスホン酸化合物又はその塩以外にも、様々な成分を含ませることもできる。
(3) Electrolytic Polishing Solution The electrolytic polishing solution of the present invention can also contain various components in addition to the above-described phosphoric acid and phosphonic acid compound or a salt thereof.
例えば、本発明の電解研磨液には、硫酸カリウムを含ませることもできる。これにより、電解研磨処理中に鉄イオンをより効果的に捕捉することができ、不溶性のリン酸鉄塩の生成をより抑制することができる結果、溶接スケール除去時のステンレス鋼表面の白濁化をより抑制することができる。 For example, the electropolishing liquid of the present invention can also contain potassium sulfate. As a result, iron ions can be captured more effectively during the electrolytic polishing process, and the formation of insoluble iron phosphate can be further suppressed. As a result, the clouding of the stainless steel surface at the time of weld scale removal is achieved. It can suppress more.
本発明の電解研磨液に硫酸カリウムを含ませる場合、その含有量は、0.01〜10質量%が好ましく、1〜8質量%がより好ましい。硫酸カリウムの含有量をこの範囲とすることにより、電解研磨処理中に鉄イオンをより効果的に捕捉することができ、不溶性のリン酸鉄塩の生成をより抑制することができる結果、溶接スケール除去時のステンレス鋼表面の白濁化をより抑制することができる。 When potassium sulfate is contained in the electropolishing liquid of the present invention, its content is preferably 0.01 to 10% by mass, and more preferably 1 to 8% by mass. By setting the content of potassium sulfate in this range, it is possible to capture iron ions more effectively during the electrolytic polishing process and to further suppress the formation of insoluble iron phosphate, resulting in weld scale. The clouding of the stainless steel surface at the time of removal can be further suppressed.
また、本発明の電解研磨液には、ゲル化剤を含ませることもできる。ゲル化剤を含有させることにより、本発明の電解研磨液により適切な粘性を付与し、ペースト状の電解研磨液を得ることも可能である。電解研磨処理の際の液だれを避けたい場合、例えば、ステンレス鋼母材が垂直方向に設置された現場で溶接され、その溶接焼けを除去したい場合等に有用である。このような観点から、本発明の電解研磨液にゲル化剤を含ませる場合、その含有量は、0.01〜1質量%が好ましく、0.02〜0.5質量%がより好ましい。このようなゲル化剤としては、特に限定されないが、ヒドロキシエチルセルロース、ヒドロキシプロピルセルロース、メチルセルロース、カルボキシメチルセルロース等の化学修飾されたセルロース誘導体、キサンタンガム、グアーガム、カラギーナン、タマリンドガム、ローカストビーンガム、ペクチン等の多糖類等の1種又は2種以上を挙げることができる。 In addition, the electropolishing liquid of the present invention can also contain a gelling agent. By incorporating a gelling agent, it is also possible to give a more appropriate viscosity to the electropolishing liquid of the present invention and obtain a paste-like electropolishing liquid. This is useful, for example, when it is desired to avoid welding drips during the electropolishing process, for example, when a stainless steel base material is welded at a site installed vertically and it is desired to remove the welding burn. From such a viewpoint, when the gelling agent is included in the electropolishing liquid of the present invention, the content thereof is preferably 0.01 to 1% by mass, and more preferably 0.02 to 0.5% by mass. Such a gelling agent is not particularly limited, but chemically modified cellulose derivatives such as hydroxyethyl cellulose, hydroxypropyl cellulose, methyl cellulose, carboxymethyl cellulose, xanthan gum, guar gum, carrageenan, tamarind gum, locust bean gum, pectin, etc. One or more of polysaccharides and the like can be mentioned.
また、本発明の電解研磨液には、ジエチレングリコールを含ませることもできる。ジエチレングリコールを含有させることにより、ステンレス鋼表面の白濁化を抑制しつつも、溶接スケール除去性能をさらに向上させることが可能である。このような観点から、本発明の電解研磨液にジエチレングリコールを含ませる場合、その含有量は、0.01〜1質量%が好ましく、0.02〜0.5質量%がより好ましい。 Moreover, diethylene glycol can also be included in the electropolishing liquid of the present invention. By containing diethylene glycol, it is possible to further improve weld scale removal performance while suppressing clouding of the stainless steel surface. From such a point of view, when diethylene glycol is included in the electrolytic polishing solution of the present invention, the content thereof is preferably 0.01 to 1% by mass, and more preferably 0.02 to 0.5% by mass.
その他、本発明の電解研磨液には、シュウ酸、グリセリン等を含ませることもできる。シュウ酸、グリセリン等を含有させることにより、ステンレス鋼表面の白濁化をより効果的に抑制することが可能である。このような観点から、本発明の電解研磨液にシュウ酸、グリセリン等を含ませる場合、その合計含有量は、0.01〜1質量%が好ましく、0.02〜0.5質量%がより好ましい。 In addition, oxalic acid, glycerin and the like can also be contained in the electropolishing liquid of the present invention. By containing oxalic acid, glycerin or the like, it is possible to more effectively suppress the clouding of the stainless steel surface. From such a viewpoint, when oxalic acid, glycerin and the like are contained in the electrolytic polishing solution of the present invention, the total content thereof is preferably 0.01 to 1% by mass, and more preferably 0.02 to 0.5% by mass.
このような本発明の電解研磨液は、溶接スケールを効果的に除去するとともに、電解研磨処理中に鉄イオンをより効果的に捕捉することができ、不溶性のリン酸鉄塩の生成をより抑制することができる結果、溶接スケール除去時のステンレス鋼表面の白濁化をより抑制することができる観点から、水溶液が好ましい。水の使用量は、本発明の電解研磨液中の各成分の含有量を上記範囲となるように調整することが好ましい。この結果、本発明の電解研磨液を酸性とすることができ、溶接スケールを効果的に除去することができる。 Such an electrolytic polishing solution of the present invention can effectively remove weld scale, and can more effectively capture iron ions during electrolytic polishing treatment, thereby further suppressing the formation of insoluble iron phosphate. As a result of the above, an aqueous solution is preferable from the viewpoint of being able to further suppress clouding of the stainless steel surface at the time of welding scale removal. The amount of water used is preferably adjusted so that the content of each component in the electropolishing liquid of the present invention is in the above range. As a result, the electropolishing liquid of the present invention can be made acidic, and the weld scale can be effectively removed.
（４）電解研磨処理
本発明の電解研磨液は、ステンレス鋼表面の溶接スケールを除去するために使用されることが好ましい。この際、電解研磨処理中の白濁化を抑制することができる。
(4) Electro-Polishing Treatment The electro-polishing liquid of the present invention is preferably used to remove weld scale on the surface of stainless steel. At this time, it is possible to suppress clouding during the electropolishing treatment.
この本発明の電解研磨液を用いてステンレス鋼表面の溶接スケールを除去する場合、交流電流法又は交直重畳電流法により電解研磨処理する。交流電流法又は交直重畳電流法を採用した場合、通常、リン酸を主成分とする電解研磨液を使用した場合は電解研磨処理時に白濁化が生じやすいが、このような場合であっても、本発明の電解研磨液を使用した場合には、白濁化を効果的に抑制することができる。 When the weld scale on the surface of stainless steel is removed using the electrolytic polishing solution of the present invention, electrolytic polishing is performed by an alternating current method or an AC / DC superimposed current method. When an alternating current method or an AC / DC superimposed current method is employed, usually, when an electrolytic polishing solution containing phosphoric acid as a main component is used, white turbidity tends to occur at the time of electrolytic polishing treatment, but even in such a case, When the electrolytic polishing solution of the present invention is used, clouding can be effectively suppressed.
この場合、交流電流法又は交直重畳電流法において、本発明の電解研磨液を使用すること以外は従来と同様の条件で行うことができる。例えば、交直重畳電流法を採用する場合は、ステンレス鋼母材を、交流電流や、直流に交流を重ねた交直重畳電流の陽極側に接続し、本発明の電解研磨液を使用して電解処理することができる。この際、電解液の保持性が良好な布又はフェルトに本発明の電解研磨液を含浸させて陽極であるステンレス鋼母材に押し当てることにより、本発明の電解研磨液を電気分解における電解質とすることもできる。これにより、陽極で溶解が起こり、陽極であるステンレス鋼母材表面から溶接スケールが溶出することにより、溶接スケールが除去されるとともに、リン酸鉄塩の生成が抑制されるために白濁化も抑制される。これらの電流方式や条件は、ステンレス鋼の表面処理の用途、電解処理液の仕様、表面処理を行う母材の材質、母材の表面処理加工の種類等によって、最適な方式を選択することが好ましい。なお、交流電流法又は交直重畳電流法による電解研磨処理時の電流、電圧等の各種条件は常法にしたがい調整することができる。例えば、出力電圧は10〜70Vの範囲で調節し、5〜90Aの電流を流すことが好ましい。 In this case, in the alternating current method or the AC / DC superimposed current method, the process can be carried out under the same conditions as in the prior art except that the electrolytic polishing solution of the present invention is used. For example, when adopting the AC / DC superimposed current method, the stainless steel base material is connected to the anode side of an AC current or AC / DC superimposed current in which AC is superimposed on AC, and electrolytic treatment is performed using the electrolytic polishing solution of the present invention can do. At this time, a cloth or felt having a good electrolyte retention property is impregnated with the electropolishing liquid of the present invention and pressed against a stainless steel base material as an anode, whereby the electropolishing liquid of the present invention can be used as an electrolyte in electrolysis. You can also As a result, dissolution occurs at the anode, and the weld scale is eluted from the surface of the stainless steel base material that is the anode, thereby removing weld scale and suppressing formation of iron phosphate and suppressing white turbidity Be done. For these current methods and conditions, it is possible to select an optimum method depending on the application of surface treatment of stainless steel, the specification of electrolytic treatment solution, the material of the base material to be surface treated, the type of surface treatment of the base material, etc. preferable. Note that various conditions such as current and voltage at the time of electrolytic polishing treatment by the alternating current method or the AC / DC superimposed current method can be adjusted according to the conventional method. For example, it is preferable to adjust the output voltage in the range of 10 to 70 V and pass a current of 5 to 90 A.
以下、実施例及び比較例を示して本発明を具体的に説明するが、本発明は、これらのみに限定されないことは言うまでもない。 EXAMPLES The present invention will be specifically described below by showing Examples and Comparative Examples, but it goes without saying that the present invention is not limited to these.
なお、実施例において、各種試薬は以下のものを使用した。
SUS-N：（株）日本科学エンジニアリング製
オルトリン酸：ラサ工業（株）製
ピロリン酸：大道製薬（株）製
塩酸：要薬品（株）製
1-ヒドロキシエチリデン-1,1-ジホスホン酸（キレストPH-210）：キレスト（株）製
ニトリロトリス（メチレンホスホン酸）（キレストPH-320）：キレスト（株）製。
In the examples, the following various reagents were used.
SUS-N: Orthophosphoric acid manufactured by Nippon Kagaku Engineering Co., Ltd .: Pyrex. Manufactured by Lasa Kogyo Co., Ltd .: Hydrochloric acid manufactured by Daido Pharmaceutical Co., Ltd.
1-hydroxyethylidene-1,1-diphosphonic acid (Kylest PH-210): Nitrilotris (methylene phosphonic acid) (Kylest PH-320) manufactured by Chelest Co., Ltd .: manufactured by Chelest Co., Ltd.
速度試験用ステンレス鋼板には、SUS-304（50mm×100mm×1.6mm；2B材）に溶接でビードを作成したものを使用した。溶接条件は、初期電流20A、溶接電流60A、クレーター電流20A、ガス流量6L/min、スピード約1000m/m/分とした。 As a stainless steel plate for velocity test, a SUS-304 (50 mm × 100 mm × 1.6 mm; 2 B material) welded bead was used. The welding conditions were: initial current 20A, welding current 60A, crater current 20A, gas flow rate 6 L / min, speed about 1000 m / m / min.
また、白濁化確認用ステンレス鋼板には、SUS304（50mm×100mm×1.6mm；鏡面材；ビード無し）を使用し、電解研磨処理にはマイト工業（株）製のマイトスケーラMS-2100を用いた。 In addition, SUS304 (50 mm x 100 mm x 1.6 mm; mirror surface material; no bead) was used as the stainless steel plate for confirmation of whitening, and Mitscaler MS-2100 manufactured by Mitto Kogyo Co., Ltd. was used for the electropolishing treatment. .
上記したステンレス鋼板に対して、表１に示す電解研磨液を用いて、交流電流法（AC）又は直流電流法（DC）による電解研磨処理を施した。なお、ピロリン酸は加水分解するとオルトリン酸になるため、表中のピロリン酸の含有量は、オルトリン酸に換算した場合の含有量である。具体的には、交流電流法及び直流電流法を採用する場合いずれも、上記したステンレス鋼板を電源の一極に接続し、他の一極は上記したステンレス鋼板と同じ材質の電極を合成繊維製の不織布で巻き、その不織布に表１に示す電解研磨液（pHは約0.6である）を染み込ませて摺動させた。この際、交流電流法（AC）では電圧35.4V及び電流6A、直流電流法（DC）では電圧34.8V及び電流19Aとした。電解研磨処理の処理速度（溶接スケール除去速度）及び美観（白濁化）に関する結果を表１に示す。また、上記したステンレス鋼板に対して、表２に示す電解研磨液を用いて、交直重畳電流法による電解研磨処理を施した。上記と同様に、上記したステンレス鋼板を電源の一極に接続し、他の一極は上記したステンレス鋼板と同じ材質の電極を合成繊維製の不織布で巻き、その不織布に表２に示す電解研磨液（pHは約0.6である）を染み込ませて摺動させた。この際、モード切替スイッチを交直重畳電流を印加できるマスターモードに合わせ、出力切替スイッチを交流（AC）に合わせて測定した（電圧36.7V及び電流19A）。結果を表２に示す。なお、美観（白濁化）の評価については、電極を当てた箇所の周囲の白い部分の幅の長さから、現行酸性液のものを3としてエキスパートが5段階で評価した（数字が大きいほど優れており、5は白い部分が全くないことを示す）。 The above-described stainless steel plate was subjected to an electrolytic polishing process by an alternating current method (AC) or a direct current method (DC) using the electrolytic polishing solution shown in Table 1. In addition, since pyrophosphoric acid will become orthophosphoric acid when it hydrolyzes, content of pyrophosphoric acid in a table | surface is content when converting into orthophosphoric acid. Specifically, when adopting the alternating current method and the direct current method, the stainless steel plate described above is connected to one pole of the power supply, and the other pole is made of synthetic fiber of the same material as the stainless steel plate described above The non-woven fabric was impregnated with the electropolishing liquid (pH is about 0.6) shown in Table 1 and was slid on the non-woven fabric. At this time, the voltage was 35.4 V and the current 6 A in the alternating current method (AC), and the voltage 34.8 V and the current 19 A in the direct current method (DC). The results for the treatment rate (welding scale removal rate) and the appearance (whitening) of the electrolytic polishing treatment are shown in Table 1. In addition, the above-described stainless steel plate was subjected to electrolytic polishing treatment by an AC-DC superimposed current method using the electrolytic polishing liquid shown in Table 2. In the same manner as described above, the stainless steel plate described above is connected to one pole of a power supply, the other pole is wound with an electrode made of the same material as the stainless steel plate described above with a synthetic fiber non-woven fabric, and the non-woven fabric shown in Table 2 The solution (pH is about 0.6) was impregnated and slid. Under the present circumstances, according to the master mode which can apply alternating current direct superposition current, the mode change switch was adjusted according to alternating current (AC) and the output change switch was measured (voltage 36.7V and electric current 19A). The results are shown in Table 2. In addition, about evaluation of the aesthetics (white turbidity), the expert evaluated it in five steps as the thing of the present acidic liquid from the length of the width of the white part around the part which applied the electrode (the larger the number, the better (5 indicates no white part at all).
Claims (8)
リン酸と、ホスホン酸化合物又はその塩とを含有する、ステンレス鋼用電解研磨液。 An electrolytic polishing liquid for electrolytic polishing treatment of stainless steel by an alternating current method or an alternating current direct current method,
An electrolytic polishing solution for stainless steel, containing phosphoric acid and a phosphonic acid compound or a salt thereof.
請求項１〜６のいずれか1項に記載のステンレス鋼用電解研磨液を用いて電解する、製造方法。 A method for producing stainless steel in which surface clouding is suppressed,
The manufacturing method electrolyzed using the electrolytic polishing liquid for stainless steel of any one of Claims 1-6.
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