JPH0247300A - Method for descaling stainless steel - Google Patents
Method for descaling stainless steelInfo
- Publication number
- JPH0247300A JPH0247300A JP19783888A JP19783888A JPH0247300A JP H0247300 A JPH0247300 A JP H0247300A JP 19783888 A JP19783888 A JP 19783888A JP 19783888 A JP19783888 A JP 19783888A JP H0247300 A JPH0247300 A JP H0247300A
- Authority
- JP
- Japan
- Prior art keywords
- stainless steel
- sulfuric acid
- sheet
- descaling
- electrolytic
- 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
- 239000010935 stainless steel Substances 0.000 title claims abstract description 28
- 229910001220 stainless steel Inorganic materials 0.000 title claims abstract description 28
- 238000000034 method Methods 0.000 title claims description 27
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims abstract description 62
- 229910052751 metal Inorganic materials 0.000 claims abstract description 27
- 239000002184 metal Substances 0.000 claims abstract description 27
- 229910052793 cadmium Inorganic materials 0.000 claims abstract description 6
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 5
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 5
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 5
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 5
- 229910052718 tin Inorganic materials 0.000 claims abstract description 4
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 3
- 239000007864 aqueous solution Substances 0.000 claims description 5
- 238000005868 electrolysis reaction Methods 0.000 claims description 5
- 239000000243 solution Substances 0.000 claims description 4
- 238000010306 acid treatment Methods 0.000 claims 1
- 230000007797 corrosion Effects 0.000 abstract description 19
- 238000005260 corrosion Methods 0.000 abstract description 19
- 238000005554 pickling Methods 0.000 abstract description 12
- 150000002739 metals Chemical class 0.000 abstract description 11
- 239000000203 mixture Substances 0.000 abstract 1
- 230000008569 process Effects 0.000 description 10
- 238000005516 engineering process Methods 0.000 description 6
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 5
- 150000003839 salts Chemical class 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 238000000137 annealing Methods 0.000 description 3
- 239000011651 chromium Substances 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 239000010936 titanium Substances 0.000 description 3
- 239000011701 zinc Substances 0.000 description 3
- 239000002253 acid Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- QCUOBSQYDGUHHT-UHFFFAOYSA-L cadmium sulfate Chemical compound [Cd+2].[O-]S([O-])(=O)=O QCUOBSQYDGUHHT-UHFFFAOYSA-L 0.000 description 2
- 150000003841 chloride salts Chemical class 0.000 description 2
- 238000005097 cold rolling Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000007654 immersion Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000009257 reactivity Effects 0.000 description 2
- 238000010301 surface-oxidation reaction Methods 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 238000010420 art technique Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 description 1
- 229910000331 cadmium sulfate Inorganic materials 0.000 description 1
- 229910000369 cadmium(II) sulfate Inorganic materials 0.000 description 1
- 238000010349 cathodic reaction Methods 0.000 description 1
- GRWVQDDAKZFPFI-UHFFFAOYSA-H chromium(III) sulfate Chemical compound [Cr+3].[Cr+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O GRWVQDDAKZFPFI-UHFFFAOYSA-H 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 229910000361 cobalt sulfate Inorganic materials 0.000 description 1
- 229940044175 cobalt sulfate Drugs 0.000 description 1
- KTVIXTQDYHMGHF-UHFFFAOYSA-L cobalt(2+) sulfate Chemical compound [Co+2].[O-]S([O-])(=O)=O KTVIXTQDYHMGHF-UHFFFAOYSA-L 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- VDQVEACBQKUUSU-UHFFFAOYSA-M disodium;sulfanide Chemical compound [Na+].[Na+].[SH-] VDQVEACBQKUUSU-UHFFFAOYSA-M 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000007429 general method Methods 0.000 description 1
- 229960002050 hydrofluoric acid Drugs 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 238000001465 metallisation Methods 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- LGQLOGILCSXPEA-UHFFFAOYSA-L nickel sulfate Chemical compound [Ni+2].[O-]S([O-])(=O)=O LGQLOGILCSXPEA-UHFFFAOYSA-L 0.000 description 1
- 229910000363 nickel(II) sulfate Inorganic materials 0.000 description 1
- 150000002823 nitrates Chemical class 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 229910052979 sodium sulfide Inorganic materials 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000002436 steel type Substances 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- FAKFSJNVVCGEEI-UHFFFAOYSA-J tin(4+);disulfate Chemical compound [Sn+4].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O FAKFSJNVVCGEEI-UHFFFAOYSA-J 0.000 description 1
- HDUMBHAAKGUHAR-UHFFFAOYSA-J titanium(4+);disulfate Chemical compound [Ti+4].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O HDUMBHAAKGUHAR-UHFFFAOYSA-J 0.000 description 1
- NWONKYPBYAMBJT-UHFFFAOYSA-L zinc sulfate Chemical compound [Zn+2].[O-]S([O-])(=O)=O NWONKYPBYAMBJT-UHFFFAOYSA-L 0.000 description 1
- 229910000368 zinc sulfate Inorganic materials 0.000 description 1
- 229960001763 zinc sulfate Drugs 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、ステンレス鋼冷延焼鈍鋼帯の電解酸洗方法に
関し、特に焼鈍後の表面酸化スケールを短時間に除去す
ると同時に当該ステンレス鋼帯の脱スケール面に高い耐
食性を付与するための極めて効果的な方法に関するもの
である。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an electrolytic pickling method for cold-rolled and annealed stainless steel strip, and in particular to a method for removing surface oxidation scale after annealing in a short period of time and at the same time cleaning the stainless steel strip. This invention relates to an extremely effective method for imparting high corrosion resistance to descaled surfaces of.
〔従来の技術］
従来、ステンレス鋼の冷延焼鈍鋼帯の表面酸化スケール
を除去する一般的な方法としては、アルカリ溶融塩浸漬
処理（いわゆるソルト処理）、中性塩（例えばＮａ２Ｓ
Ｏ４やＮａＮ０ａ等）電解質水溶液中での電解処理を行
い、それに続いて硫酸、硝酸、硝弗酸等の酸中で浸漬ま
たは電解処理を行う方法が、鋼種に応じて適宜組合せて
用いられてきた。[Prior Art] Conventionally, general methods for removing surface oxidation scale from cold-rolled and annealed stainless steel strips include alkali molten salt immersion treatment (so-called salt treatment), neutral salt treatment (for example, Na2S
A method of performing electrolytic treatment in an electrolyte aqueous solution (such as O4 or NaN0a), followed by immersion or electrolytic treatment in an acid such as sulfuric acid, nitric acid, nitric-fluoric acid, etc., has been used in appropriate combinations depending on the steel type. .
ところで、最近では生産効率を上げる目的から、従来の
酸洗ライン通板速度２０〜５０ｍ／分をさらに増速、高
速化させることが検討され、短時間での脱スケール技術
の開発が目ざされている。By the way, recently, with the aim of increasing production efficiency, it has been considered to further increase and speed up the current pickling line threading speed of 20 to 50 m/min, and the aim is to develop descaling technology in a short time. ing.
本発明者の１人は、最近この課題を解決できる極めて有
効な脱スケール法を提案した。すなわち９００〜１２５
０ｇ／ｌの濃度の硫酸水溶液中でステンレス鋼冷延焼鈍
鋼帯を電解酸洗する方法（特開昭６３−８６８９９）で
ある。この方法により１００ｍ／分以上の酸洗ライン通
板速度を得ることが可能となったのである。One of the inventors has recently proposed a highly effective descaling method that can solve this problem. i.e. 900-125
This is a method of electrolytically pickling a cold rolled annealed stainless steel strip in an aqueous sulfuric acid solution having a concentration of 0 g/l (Japanese Patent Laid-Open No. 63-86899). This method made it possible to obtain a pickling line running speed of 100 m/min or more.
しかしながら、これらの有効な従来技術によっても達成
されずに残されている問題がある。However, there are problems that remain unsolved even with these effective prior art techniques.
すなわち、近年客先からは脱スケールされたステンレス
鋼表面の耐食性（耐初期錆性）の向上が求められている
が、上記の従来技術は脱スケールを目的とする技術であ
るので、このような要求に対しては脱スケール後、別工
程として耐食性付与処理を行わねばならなかった。In other words, in recent years, customers have been demanding improvements in the corrosion resistance (initial rust resistance) of descaled stainless steel surfaces, but the above conventional technology is aimed at descaling. In order to meet the requirements, corrosion resistance imparting treatment had to be performed as a separate process after descaling.
このような別工程処理は生産工程的に複雑であるばかり
か、処理速度が遅いために生産効率を低下させることと
なり、上で述べたような短時間での脱スケール技術が活
かされない結果となっていた。また、このような別工程
処理は設備的にも負担要素となり、結果的に製品のコス
トアップにつながるというマイナス要因であった。Such separate process treatment not only complicates the production process, but also reduces production efficiency due to the slow processing speed, resulting in the short-time descaling technology mentioned above not being utilized. was. In addition, such separate processing is a burden on equipment, which is a negative factor that results in an increase in product costs.
〔発明が解決しようとする課題］
本発明はこのような問題点を解決し、短時間での脱スケ
ール性を確保すると共に、同一処理槽内での同一工程と
して高い耐食性を付与することができるという従来技術
に欠けていた領域をカバーする１画期的な脱スケール方
法を提案するもので、短時間で脱スケールと耐食性付与
を同時に完了することを目的とする技術を提供するもの
である。[Problems to be Solved by the Invention] The present invention can solve these problems, ensure descaling in a short time, and provide high corrosion resistance in the same process in the same treatment tank. This paper proposes an innovative descaling method that covers areas that conventional technology lacks, and provides a technology that aims to simultaneously complete descaling and imparting corrosion resistance in a short period of time.
〔課題を解決するための手段ｊ
本発明者らはステンレス鋼冷延焼鈍鋼帯の脱スケール方
法ならびにステンレス鋼の耐食性付与処理法について鋭
意実験を重ねながら詳細に検討を重ねた結果、ステンレ
ス鋼の冷延焼ｘｍ帯を硫酸中にて電解により脱スケール
する際、その硫酸濃度が９００〜１２５０ｇ／Ｒで、か
ツＺ ｎ 。[Means for Solving the Problems] The present inventors conducted extensive experiments and studied in detail methods for descaling stainless steel cold-rolled annealed steel strips and methods for imparting corrosion resistance to stainless steel. When the cold-rolled xm strip is electrolytically descaled in sulfuric acid, the sulfuric acid concentration is 900 to 1250 g/R.
Ｓｎ、Ｍｏ、Ｃｒ、Ｔｉ、Ｃｏ、Ｎｉ、Ｃｄのうち１種
または２種以上を当該硫酸水溶液中での溶存金属１度が
ｌ Ｏｇ／ｌ以上となるように添加した硫酸水溶液系処
理液を用い、電解槽において。A sulfuric acid aqueous solution-based treatment solution to which one or more of Sn, Mo, Cr, Ti, Co, Ni, and Cd is added such that the dissolved metal degree in the sulfuric acid aqueous solution is 1 Og/l or more. used in an electrolytic cell.
ステンレス鋼を少な（とも１度陽陰両極性とし、電解槽
出側での最終極性を陰極として電解処理を行うことによ
って、極めて短時間に脱スケールができると共に、耐初
期錆性の向上をも達成することができることを見出した
、
〔作用〕
以下に本発明の作用について説明する。By electrolytically treating stainless steel with a small amount of polarity (both positive and negative once, and using the final polarity at the exit side of the electrolytic tank as the cathode), descaling can be achieved in an extremely short time, and the initial rust resistance can also be improved. [Action] The action of the present invention will be described below.
硫酸はステンレス鋼冷延焼鈍鋼帯の酸洗において一般的
に用いられる処理液の一つであるが１通常用いられる濃
度（５０ｇ／ｌ〜２００ｇ／２）では、連続焼鈍ライン
（ＣＡＬ）に相当する通板速度（Ｌｏｏｍ／分以上）で
酸洗槽−槽での脱スケール処理は不可能である。言い換
えると、従来の硫酸濃度そのままで一槽処理工程とする
には酸洗槽を極めて長大なものとせざるを得なかった。Sulfuric acid is one of the treatment liquids commonly used for pickling cold-rolled stainless steel and annealed steel strips.1 At the concentrations normally used (50 g/l to 200 g/2), it is equivalent to a continuous annealing line (CAL). Descaling treatment in the pickling tank-tank is impossible at the plate passing speed (loom/min or higher). In other words, in order to perform a one-tank treatment process with the conventional sulfuric acid concentration unchanged, the pickling tank had to be extremely long.
この点を改善し、−槽での短時間脱スケールを可能とし
たのが先にも述べた特開昭６３−８６８９９である。す
なわち、９００ｇ／１２以上１２５０ｇ／ｆｆ以下の濃
度範囲からなる高濃度硫酸とすることによってＣＡＬ相
当の通板速度でもって数秒以内という短時間の脱スケー
ルが可能となるのである。そこで本発明においても、こ
の有効な特性を活かすべく、硫酸の濃度は９００ｇ／１
２以上１２５０ｇ／４２以下とする。特にこの濃度を超
えると脱スケール後の表面に肌荒れが生じるので、この
濃度範囲とすることが必要となる。The above-mentioned Japanese Patent Application Laid-open No. 63-86899 improved this point and enabled short-time descaling in a -tank. That is, by using high-concentration sulfuric acid with a concentration range of 900 g/12 to 1250 g/ff, descaling can be carried out in a short time, within several seconds, at a threading speed equivalent to CAL. Therefore, in the present invention, in order to take advantage of this effective property, the concentration of sulfuric acid is 900g/1.
2 or more and 1250g/42 or less. In particular, if the concentration exceeds this range, roughness will occur on the surface after descaling, so it is necessary to keep the concentration within this range.
次に上で述べた硫酸に添加する金属について述べる６本
発明の目的である耐食性の向上を達成するには金属とし
てＺｎ、Ｓｎ、Ｃｄ、Ｍｏ。Next, we will discuss the metals to be added to the sulfuric acid mentioned above.6 In order to achieve the improvement in corrosion resistance, which is the objective of the present invention, Zn, Sn, Cd, and Mo are used as metals.
Ｃｒ、Ｔｉ、Ｇｏ、Ｎｉが用いられる。これらは何れも
水溶液中で単体金属状態あるいは共析状態で還元析出さ
れる金属で、かつ耐食性を示すものである６本発明はこ
のような性質に気付き、活用するものである。これらの
金属の添加は純金属、塩化物等どんな化合物の形で行っ
ても構わないが、酸の管理あるいは硫酸中への溶解性等
の点から純金属または塩化物あるいは硝酸塩として添加
することが望ましい。Cr, Ti, Go, and Ni are used. All of these are metals that are reduced and precipitated in an aqueous solution in a single metal state or in a eutectoid state, and exhibit corrosion resistance.6 The present invention has noticed and utilizes these properties. These metals may be added in the form of any compound such as pure metals or chlorides, but from the viewpoint of acid management and solubility in sulfuric acid, it is preferable to add them as pure metals, chlorides, or nitrates. desirable.
次にこれらの金属の添加量（ａ度）について実施例に基
づいて説明する。Next, the amount (a degree) of these metals added will be explained based on examples.
第１表は上で述べた濃度範囲の硫酸とじて１０００ｇ／
βの硫酸を用いた場合に、Ｚｎ。Table 1 shows 1000g/1000g of sulfuric acid in the concentration range mentioned above.
When β sulfuric acid is used, Zn.
Ｃｄ、Ｎｉの各純金属または各硫酸塩について、硫酸中
での溶存金属濃度（ｇ／ｌ）および系での全硫酸濃度（
ｇ／β）と脱スケール性および陰極電解処理後の耐食性
との関係をみたものである。第１表から純金属あるいは
金属硫酸塩の種類によらず、硫酸中の溶存金属濃度（ｇ
／ρ）がｌｏｇ／β以上で耐食性の改善が見られるとと
もに、全硫酸濃度が１２５０ｇ／ｌを超えると脱スケー
ル性が低下することが分る。For each pure metal such as Cd and Ni or each sulfate, the dissolved metal concentration in sulfuric acid (g/l) and the total sulfuric acid concentration in the system (
This figure looks at the relationship between g/β), descaling property, and corrosion resistance after cathodic electrolytic treatment. Table 1 shows that the dissolved metal concentration in sulfuric acid (g
It can be seen that corrosion resistance is improved when /ρ) is greater than log/β, and descaling performance is decreased when the total sulfuric acid concentration exceeds 1250 g/l.
他の金属について本発明者が行った検討結果でも、全く
同様の結果が得られた。これらの結果から本発明では、
金属の添加量は硫酸中の溶存金属濃度として１０ｇ／β
以上となるように定めたのである。Exactly the same results were obtained from studies conducted by the present inventors on other metals. Based on these results, in the present invention,
The amount of metal added is 10g/β as the dissolved metal concentration in sulfuric acid.
The above was established.
また、金属は１種のみならず２種以上を同時に用いるこ
とができる。すなわち、後で実施例でも示すように、例
えばＣｒ −Ｍ Ｏ系、Ｃｒ−Ｃ。Moreover, not only one type of metal but also two or more types of metal can be used simultaneously. That is, as will be shown later in Examples, for example, Cr-M O system, Cr-C.
系、Ｚｎ−Ｎｉ系のように共析する金属の組合せであれ
ば１本発明の目的を十分に達成することができる。従っ
て、１種の金属だけでなく適当な系であれば２種以上の
複合添加とすることができるのである。The object of the present invention can be fully achieved with a combination of eutectoid metals such as Zn--Ni and Zn--Ni. Therefore, it is possible to add not only one kind of metal but also two or more kinds of metals in a suitable system.
次に本発明を完成するために、必要な電解条件について
説明する。本発明では、電解時のステンレス鋼の極性と
して、電解槽の入側では陽極、電解槽出側では陰極とさ
れなければ十分な目的達成は得られない。すなわち硫酸
中でステンレス鋼が脱スケールされるのは陽極性となる
時である。Next, electrolytic conditions necessary to complete the present invention will be explained. In the present invention, the purpose cannot be fully achieved unless the polarity of the stainless steel during electrolysis is an anode on the inlet side of the electrolytic cell and a cathode on the outlet side of the electrolytic cell. In other words, stainless steel is descaled in sulfuric acid when it becomes anodic.
方、添加された金属より生じた金属イオンが還元され、
ステンレス鋼の表面に析出するのはステンレス鋼が陰極
性の時である。このように脱スケール性を確保しつつ耐
食性の向上を目指す本発明では陽極性の反応、陰極性の
反応、何れもが重要で省略することができないと同時に
、脱スケール達成後、金属析出させると言う順序も重要
となるので、先にも述べたように電解槽入側では陽極、
電解槽出側では陰極の極性とする必要がある。On the other hand, the metal ions generated from the added metal are reduced,
Precipitation occurs on the surface of stainless steel when the stainless steel is cathodic. In this invention, which aims to improve corrosion resistance while ensuring descaling properties, both anodic and cathodic reactions are important and cannot be omitted. The order in which the
It is necessary to set the polarity of the cathode on the exit side of the electrolytic cell.
なお、電解時の他の条件としては、従来技術と同様の条
件が用いられる。すなわち、硫酸−金属系処理液の液温
は室温から９０℃程度の間で用いられるが、４０℃未満
ではステンレス鋼表面の酸化スケールとの反応性に乏し
く、脱スケールに長時間を必要とするので効率が低い。Note that as other conditions during electrolysis, the same conditions as in the prior art are used. In other words, the temperature of the sulfuric acid-metal treatment solution used is between room temperature and about 90°C, but if it is below 40°C, it has poor reactivity with the oxidized scale on the stainless steel surface and requires a long time to descale. Therefore, efficiency is low.
一方、９０℃を超えると反応性が過激となり、肌荒れな
どの原因となり易い。これらのことから液温としては４
０℃以上、９０℃以下とすることが望ましい。On the other hand, if the temperature exceeds 90°C, the reactivity becomes extreme and tends to cause rough skin. From these facts, the liquid temperature is 4
It is desirable that the temperature be 0°C or higher and 90°C or lower.
電解時の電流密度は５Ａ／ｄｒ１１′以上、３０Ａ／ｄ
ｒｎ”以下が望ましい。Current density during electrolysis is 5A/dr11' or more, 30A/d
rn” or less is desirable.
すなわち、５ Ａ ／ ｄ ｒｎ″未満では脱スケール
性、金属析出性とも低（、長時間の電解処理を要し、生
産性が低下する。一方、３０Ａ／ｄｍ”を超えると表面
の肌荒れなどの過酸洗の状況が生じ易くなり、品質の低
下につながると共に、設備的にも大容量の設備となり、
膨大な設備費を要することになるので望ましいものでは
ない。That is, if it is less than 5 A/drn", both descaling property and metal deposition property will be low (requires long electrolytic treatment, and productivity will decrease. On the other hand, if it exceeds 30 A/drn", the surface roughness etc. Over-pickling is likely to occur, leading to quality deterioration, and the equipment requires large capacity.
This is not desirable because it requires a huge amount of equipment cost.
電解時間としては陽、陰画極性とも、それぞれ１〜２０
秒間とすることで本発明の目的を達成することができる
。The electrolysis time is 1 to 20 for both positive and negative polarity.
The object of the present invention can be achieved by setting the time to seconds.
なお、以上述べたような形態、作用をなすことを特徴と
する本発明は、通常よく用いられているステンレス鋼の
脱スケール方法と組み合わせるとその効果は一層有効と
なるものである。The present invention, which is characterized by having the form and function as described above, becomes even more effective when combined with a commonly used stainless steel descaling method.
〔実施例１ 以下本発明の実施例について説明する。[Example 1 Examples of the present invention will be described below.
実施例１
冷間圧延後、連続焼鈍炉で通常条件で焼鈍されたＳＵＳ
４３０ｍ帯に対して、金属Ｚｎ：！３よび硫酸亜鉛（Ｚ
ｎＳＯ４−７８２０）を単独で添加した硫酸を用いて電
解処理した後、塩水噴霧試墾（ＪＩＳＺ２３７１）を実
施し、脱スケール性と耐食性を調べた。その結果を第２
表に示す、この結果から本発明法の電解処理により短時
間のステンレス鋼の脱スケールが達成されると同時に耐
食性の向上が同一工程で得られることが分る。Example 1 SUS annealed under normal conditions in a continuous annealing furnace after cold rolling
For the 430m band, metal Zn:! 3 and zinc sulfate (Z
After electrolytic treatment using sulfuric acid to which nSO4-7820) was added alone, a salt spray test (JIS Z2371) was carried out to examine descaling properties and corrosion resistance. The second result is
The results shown in the table show that the electrolytic treatment of the present invention achieves descaling of stainless steel in a short time and at the same time improves corrosion resistance in the same process.
実施例２
冷間圧延後、連続焼鈍された５ＵＨ４０９鋼帯に対して
金属錫または硫酸錫（ＳｎＳＯ＋）あるいは金属カドミ
ウムまたは硫酸カドミウム（ＣｄＳＯ４）をそれぞれ単
独あるいは複合で添加した硫酸を用いて電解処理した後
、実施例１と同様にして調べた結果を第３表に示す。Example 2 After cold rolling, a continuously annealed 5UH409 steel strip was electrolytically treated using sulfuric acid to which metallic tin or tin sulfate (SnSO+) or metallic cadmium or cadmium sulfate (CdSO4) was added individually or in combination. Thereafter, the results were investigated in the same manner as in Example 1 and are shown in Table 3.
この結果から本発明法の電解処理により、短時間でステ
ンレス鋼の脱スケールが達成されると同時に耐食性の向
上が同一工程で得られることが分る。These results show that the electrolytic treatment of the present invention achieves descaling of stainless steel in a short time and at the same time improves corrosion resistance in the same process.
実施例３
冷間圧延後、通常条件で焼鈍された５ＵＳ３０４鋼帯に
対して、金属クロムまたは硫酸クロム（Ｃｒ２（ＳＯ４
） ３・１８Ｈ２０）および金属モリブデンを単独ない
し複合で添加した硫酸を用いて電解処理した後、実施例
１と同様にして調べた結果を第４表に示す。Example 3 Metallic chromium or chromium sulfate (Cr2(SO4)
) 3.18H20) and sulfuric acid to which metal molybdenum was added singly or in combination, and then investigated in the same manner as in Example 1. The results are shown in Table 4.
この結果から、本発明法の電解処理により、短時間のス
テンレス鋼の脱スケールと同時に、同一工程で耐食性の
向上をも達成できることが明らかである。From these results, it is clear that the electrolytic treatment of the present invention can simultaneously descale stainless steel in a short time and improve corrosion resistance in the same process.
実施例４
冷間圧延後、連続焼鈍された５Ｕ５４３０銅帯に対して
金属コバルトまたは硫酸コバルト（ＣＯ５Ｏ４・７Ｈ２
０）、金属チタンまたは硫酸チタン（Ｔｉ （ＳＯ４
）２）および金属ニッケルまたは硫酸ニッケル（ＮｉＳ
Ｏ４−７８２０）を各々単独ないし複合で添加した硫酸
を用いて電解処理した後、実施例１と同様にして調べた
結果を第５表に示す。Example 4 Cobalt metal or cobalt sulfate (CO5O4.7H2
0), metallic titanium or titanium sulfate (Ti (SO4
)2) and metallic nickel or nickel sulfate (NiS
Table 5 shows the results of an investigation conducted in the same manner as in Example 1 after electrolytic treatment using sulfuric acid to which O4-7820) was added either singly or in combination.
この結果から本発明法の電解処理により、短時間でステ
ンレス鋼の脱スケールと同時に、同一工程で耐食性の向
上をも達成されることが分る。These results show that the electrolytic treatment of the present invention can simultaneously descale stainless steel in a short time and improve corrosion resistance in the same process.
［発明の効果］
以上、実施例において説明したように、本発明はステン
レス鋼冷延焼鈍鋼帯を電解処理し、脱スケールするに当
たっての画期的な新技術を提供するものであり、以下の
如くの有益な効果を発揮できるものである。[Effects of the Invention] As explained above in the examples, the present invention provides a revolutionary new technology for electrolytically treating cold rolled annealed stainless steel strip to descale it, and has the following features: It can have many beneficial effects.
すなわち。Namely.
（１） 本発明方法によって、極めて短時間に脱スケ
ールができると同時に、耐食性の向上（改善）化が同一
工程で可能となる。(1) By the method of the present invention, descaling can be performed in an extremely short time, and at the same time, corrosion resistance can be improved in the same process.
（リ −液一工程の簡便な処理法であり、設備コスト的
に安価で、かつ生産性のアップ、生産コストのダウンを
図ることができる。(It is a simple treatment method with one step of re-liquid, low equipment cost, and can improve productivity and reduce production costs.
（３） （１）のことから高速焼鈍−酸洗ラインへの
適用が可能となる。(3) Because of (1), it can be applied to a high-speed annealing-pickling line.
等の効果が得られ、産業界への貢献度は非常に大きなも
のとなる。These effects will be obtained, and the contribution to industry will be extremely large.
また１本発明法が従来からの焼鈍−酸洗工程に応用され
ることは、生産効率アップの面で極めて有効な手段であ
ることは言うまでもなく、本発明法の活用の場は非常に
広いものである。In addition, it goes without saying that applying the method of the present invention to the conventional annealing-pickling process is an extremely effective means of increasing production efficiency, and the method of the present invention can be used in a wide range of fields. It is.
川崎製鉄株式会社Kawasaki Steel Co., Ltd.
Claims (1)
り脱スケールする際、その硫酸濃度が９００〜１２５０
ｇ／ｌで、かつＺｎ、 Ｓｎ、Ｍｏ、Ｃｒ、Ｔｉ、Ｃｏ、Ｎｉ、Ｃｄのうち１種
または２種以上を当該硫酸水溶液中での溶存金属濃度が
１０ｇ／ｌ以上となるように添加した硫酸水溶液系処理
液を用い、電解槽でステンレス鋼を少なくとも１度陽陰
両極性とし、電解槽出側での最終極性を陰極として電解
処理を行うことを特徴とするステンレス鋼の脱スケール
方法。[Claims] 1. When descaling a cold rolled annealed stainless steel strip by electrolysis in sulfuric acid, the sulfuric acid concentration is 900 to 1250.
g/l, and one or more of Zn, Sn, Mo, Cr, Ti, Co, Ni, and Cd were added so that the dissolved metal concentration in the sulfuric acid aqueous solution was 10 g/l or more. A method for descaling stainless steel, which is characterized in that the stainless steel is subjected to an electrolytic treatment using an aqueous sulfuric acid treatment solution, making the stainless steel polarized at least once in an electrolytic bath, and setting the final polarity at the exit side of the electrolytic bath as a cathode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19783888A JPH0247300A (en) | 1988-08-10 | 1988-08-10 | Method for descaling stainless steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19783888A JPH0247300A (en) | 1988-08-10 | 1988-08-10 | Method for descaling stainless steel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0247300A true JPH0247300A (en) | 1990-02-16 |
Family
ID=16381183
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19783888A Pending JPH0247300A (en) | 1988-08-10 | 1988-08-10 | Method for descaling stainless steel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0247300A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04194197A (en) * | 1990-11-27 | 1992-07-14 | Ohbayashi Corp | Bolt and nut tightening device for shield segment |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6244595A (en) * | 1985-08-22 | 1987-02-26 | Nippon Kinzoku Kogyo Kk | Corrosion preventing treatment of stainless steel |
| JPS62196396A (en) * | 1986-02-21 | 1987-08-29 | Kinki Yakuhin Kogyo Kk | Surface treatment method for chromium alloy |
| JPS62270796A (en) * | 1986-05-19 | 1987-11-25 | Kinki Yakuhin Kogyo Kk | Method for electrolytically coloring chromium alloy |
-
1988
- 1988-08-10 JP JP19783888A patent/JPH0247300A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6244595A (en) * | 1985-08-22 | 1987-02-26 | Nippon Kinzoku Kogyo Kk | Corrosion preventing treatment of stainless steel |
| JPS62196396A (en) * | 1986-02-21 | 1987-08-29 | Kinki Yakuhin Kogyo Kk | Surface treatment method for chromium alloy |
| JPS62270796A (en) * | 1986-05-19 | 1987-11-25 | Kinki Yakuhin Kogyo Kk | Method for electrolytically coloring chromium alloy |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04194197A (en) * | 1990-11-27 | 1992-07-14 | Ohbayashi Corp | Bolt and nut tightening device for shield segment |
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