JPH03277798A - Production of blackening treated steel sheet - Google Patents
Production of blackening treated steel sheetInfo
- Publication number
- JPH03277798A JPH03277798A JP7699890A JP7699890A JPH03277798A JP H03277798 A JPH03277798 A JP H03277798A JP 7699890 A JP7699890 A JP 7699890A JP 7699890 A JP7699890 A JP 7699890A JP H03277798 A JPH03277798 A JP H03277798A
- Authority
- JP
- Japan
- Prior art keywords
- electrolyte
- blackening
- steel sheet
- zinc
- hydroxides
- 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
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 24
- 239000010959 steel Substances 0.000 title claims abstract description 24
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 8
- 239000003792 electrolyte Substances 0.000 claims abstract description 26
- 239000007788 liquid Substances 0.000 claims abstract description 17
- 239000011701 zinc Substances 0.000 claims abstract description 17
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 11
- 150000004679 hydroxides Chemical class 0.000 claims abstract description 9
- -1 iron group ions Chemical class 0.000 claims abstract description 8
- KFZAUHNPPZCSCR-UHFFFAOYSA-N iron zinc Chemical group [Fe].[Zn] KFZAUHNPPZCSCR-UHFFFAOYSA-N 0.000 claims abstract description 8
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims abstract description 6
- 150000001340 alkali metals Chemical class 0.000 claims abstract description 6
- 238000000926 separation method Methods 0.000 claims abstract description 5
- 230000001172 regenerating effect Effects 0.000 claims abstract description 3
- 238000007743 anodising Methods 0.000 claims description 8
- 239000008151 electrolyte solution Substances 0.000 claims description 8
- 150000002500 ions Chemical class 0.000 claims description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 4
- 229910000272 alkali metal oxide Inorganic materials 0.000 claims description 4
- 229910001860 alkaline earth metal hydroxide Inorganic materials 0.000 claims description 4
- 229910000640 Fe alloy Inorganic materials 0.000 claims description 3
- 229910052742 iron Inorganic materials 0.000 claims description 2
- 230000001376 precipitating effect Effects 0.000 claims description 2
- 229910045601 alloy Inorganic materials 0.000 abstract description 9
- 239000000956 alloy Substances 0.000 abstract description 9
- 150000003839 salts Chemical class 0.000 abstract description 7
- 238000000034 method Methods 0.000 abstract description 6
- 229910052783 alkali metal Inorganic materials 0.000 abstract description 2
- 229910052784 alkaline earth metal Inorganic materials 0.000 abstract description 2
- 150000001342 alkaline earth metals Chemical class 0.000 abstract description 2
- 150000003467 sulfuric acid derivatives Chemical class 0.000 abstract description 2
- 239000007832 Na2SO4 Substances 0.000 abstract 1
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 abstract 1
- 238000001816 cooling Methods 0.000 abstract 1
- 229910052700 potassium Inorganic materials 0.000 abstract 1
- OTYBMLCTZGSZBG-UHFFFAOYSA-L potassium sulfate Chemical compound [K+].[K+].[O-]S([O-])(=O)=O OTYBMLCTZGSZBG-UHFFFAOYSA-L 0.000 abstract 1
- 229910052939 potassium sulfate Inorganic materials 0.000 abstract 1
- 238000001556 precipitation Methods 0.000 abstract 1
- 230000002035 prolonged effect Effects 0.000 abstract 1
- 230000001105 regulatory effect Effects 0.000 abstract 1
- 229910052708 sodium Inorganic materials 0.000 abstract 1
- 229910052938 sodium sulfate Inorganic materials 0.000 abstract 1
- 235000011152 sodium sulphate Nutrition 0.000 abstract 1
- 229910052759 nickel Inorganic materials 0.000 description 6
- 238000006386 neutralization reaction Methods 0.000 description 5
- 229910021645 metal ion Inorganic materials 0.000 description 4
- 239000007864 aqueous solution Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000003472 neutralizing effect Effects 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 241000549556 Nanos Species 0.000 description 1
- 229910007567 Zn-Ni Inorganic materials 0.000 description 1
- 229910007614 Zn—Ni Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910000000 metal hydroxide Inorganic materials 0.000 description 1
- 150000004692 metal hydroxides Chemical class 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
Landscapes
- Electroplating Methods And Accessories (AREA)
Abstract
Description
【発明の詳細な説明】
〈産業上の利用分野〉
本発明は、安定した黒色化度を有する黒色化処理鋼板の
製造方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a method for manufacturing a blackened steel sheet having a stable degree of blackening.
〈従来の技術〉
黒色化処理鋼板は、例えば特公昭６３−１７９２０号公
報に示めされるように、亜鉛−鉄族系合金めっき鋼板を
陽極として電解液中で陽極処理することにより、表面に
微細なりランクが数多く入り可視光線が全て吸収される
ために黒く見える非塗装鋼板であり、その用途は０ＡＩ
Ｉ材や家電を中心に最近脚光をあびている商品である。<Prior art> As shown in Japanese Patent Publication No. 63-17920, for example, a blackened steel sheet is produced by anodizing it in an electrolytic solution using a zinc-iron group alloy plated steel sheet as an anode. It is an unpainted steel plate that looks black because it contains many fine particles and all visible light is absorbed, and its use is 0AI.
It is a product that has recently been in the spotlight, mainly for I materials and home appliances.
黒色化処理鋼板の製造の際には、上記の陽極処理により
、電解液中のＺｎ、 Ｎ１等の金属イオンが漸増し、や
がて十分な黒色化度が得られなくなる問題がある。When manufacturing a blackened steel sheet, there is a problem that metal ions such as Zn and N1 in the electrolyte gradually increase due to the above-mentioned anodizing treatment, and eventually a sufficient degree of blackening cannot be obtained.
この対策として、電解液中のＺｎ、 Ｎｉ等の金属イオ
ン濃度を低減するために、アルカリ金属、アルカリ土類
金属の水酸化物の水溶液又はアルカリ水溶液を加え、Ｚ
ｎ、 Ｎｉ等の金属イオンを水酸化物として液系より取
除く方法がとられている。As a countermeasure for this, in order to reduce the concentration of metal ions such as Zn and Ni in the electrolyte, an aqueous solution of alkali metal or alkaline earth metal hydroxide or an alkaline aqueous solution is added.
A method has been used to remove metal ions such as n and Ni from the liquid system as hydroxides.
この反応は次式で表わせる。This reaction can be expressed by the following equation.
Ｚｎ５Ｏａ ＋２Ｎａ０４１（Ｎｏ）ｌ）＝ Ｚｎ （
ＯＲ）ｘ ｊ ＋ ＮａｚＳＯ−（ＬＳＯａン（］）
ＮｉＳＯ，＋２ＮａＯＨ（ＫＯＦＩ）＝Ｎｉ（ＯＨ）ｚ
↓＋ＮａｚＳＯｎ（ＫｘＳＯａ）−・−・−・・・・・
・、（２）
一方、黒色化処理液中には１を導助剤としてＮａ。Zn5Oa +2Na041(No)l)=Zn (
OR)
↓＋NazSOn(KxSOa)−・−・−・・・・・・
・, (2) On the other hand, in the blackening treatment liquid, Na is used as a guiding agent.
Ｋ、 へＥ等の硫酸塩が含まれている（例えば、前記特
公昭６３−１７９２０号公報における電解液組成の例は
ＮａｚＳＯａ ７５ｇ＃！、 ＮａＮＯｓ ２０ｇ／
ｌである）。Contains sulfates such as K and E (for example, the electrolyte composition in the above-mentioned Japanese Patent Publication No. 63-17920 is NazSOa 75g#!, NaNOs 20g#!).
).
その結果、電解液中のＮａｚＳＯａ、 ＫｚＳＯａ等の
中和塩の濃度はＺｎ、 Ｎｉイオンｅｔｃの除去に伴い
、漸増し、やがてはＮａｚＳＯａ、 ＫｘＳＯａ等の中
和塩の溶解度に達し飽和する。As a result, the concentration of neutralized salts such as NazSOa and KzSOa in the electrolyte gradually increases as Zn, Ni ions, etc. are removed, and eventually reaches the solubility of neutralized salts such as NazSOa and KxSOa and becomes saturated.
電解液中のＮａｘＳＯａ＋ ＫｚＳＯ４等の中和塩の濃
度が黒色化度に及ぼす影響は大きく、やがて十分な黒色
化度が得られなくなるという問題があった。The concentration of neutralizing salts such as NaxSOa+KzSO4 in the electrolytic solution has a large effect on the degree of blackening, and there has been a problem that a sufficient degree of blackness cannot be obtained soon.
〈発明が解決しようとする課題〉
本発明は、上述のＺｎ、 Ｎｉ等の金属イオンの除去（
中和）に伴い増加するＮａｚＳＬ＋ ＫｘＳＯａ等の中
和塩の濃度の低減を計ることにより、安定した黒色化度
を有する黒色化処理鋼板を製造する方法を提供すること
を目的とする。<Problems to be Solved by the Invention> The present invention solves the problem of removing metal ions such as Zn and Ni mentioned above (
The purpose of the present invention is to provide a method for producing a blackened steel sheet having a stable degree of blackening by reducing the concentration of neutralizing salts such as NazSL+KxSOa, which increases with neutralization.
く課題を解決するための手段〉
第１の発明は、亜鉛−鉄族系合金めっき鋼板を陽極処理
により黒色化処理する際に、アルカリ金属又はアルカリ
土類金属の水酸化物を用いて電解液のｐｌｌを５〜ｌＯ
にすることにより、亜鉛及び鉄族系イオンを水酸化物と
して沈澱させた後、電解液の液温を２０℃以下に下げて
固液分離する電解液の再生を行うことを特徴とする黒色
化処理鋼板の製造方法である。Means for Solving the Problems> The first invention provides an electrolytic solution using an alkali metal or alkaline earth metal hydroxide when blackening a zinc-iron alloy plated steel sheet by anodizing. pll of 5~1O
A blackening method characterized by regenerating the electrolyte by precipitating zinc and iron group ions as hydroxides and then lowering the temperature of the electrolyte to 20°C or less to separate solid and liquid. This is a method for manufacturing treated steel sheets.
また第２の発明は、亜鉛−鉄族系合金めっき綱板を陽極
処理により黒色化処理する際に、電解液の循環系全体の
液温を２０℃以下に下げ、かつアルカリ金属又はアルカ
リ土類金属の水酸化物を用いて電解液のｐｌｌを５〜１
０にすることにより、亜鉛及び鉄系イオンを水酸化物と
して沈澱させた後、固液分離する電解液の再生を行うこ
とを特徴とする黒色化処理鋼板の製造方法である。Further, the second invention is to reduce the temperature of the entire electrolyte circulation system to 20°C or less when blackening the zinc-iron group alloy plated steel sheet by anodizing, and to 5-1 pll of electrolyte using metal hydroxide
0 to precipitate zinc and iron-based ions as hydroxides, and then regenerate the electrolytic solution for solid-liquid separation.
〈作用〉
本発明の作用を、Ｚｎ−旧合金めっき鋼板を陽極処理し
て黒色化処理＊ｉを製造する場合を例にとって説明する
。<Function> The function of the present invention will be explained by taking as an example a case where a Zn-former alloy plated steel sheet is anodized to produce blackening treatment *i.
本発明においては、先ず、電解液中のＺｎ、 Ｎｉイオ
ンの除去のために、アルカリ金属又はアルカリ土類金属
の水酸化物、例えばＮａ０）ｌ又はＫＯＨの水溶液を用
いて、電解液のｐＨを８まで上昇させる。これによって
、電解液中のＺｎ、 Ｎｉはほぼ１ｍｇ／ｊ！以下に減
少することができる。なお、Ｚｎの水酸化物生成ｐＨは
５．１であるが、ＺｎはｐＨ１０以上ではＺｎＯ，イオ
ンとして溶解するため、電解液のｐｌｌを５〜１０に保
つ必要がある。Ｎｉの水酸化物生成ｐｌ＋は７である。In the present invention, first, in order to remove Zn and Ni ions in the electrolyte, an aqueous solution of an alkali metal or alkaline earth metal hydroxide, such as Na0)l or KOH, is used to adjust the pH of the electrolyte. Raise it to 8. As a result, Zn and Ni in the electrolyte are approximately 1mg/j! It can be reduced to: Although the pH of Zn hydroxide formation is 5.1, since Zn dissolves as ZnO, ions at pH 10 or higher, it is necessary to maintain the pll of the electrolytic solution at 5 to 10. Ni hydroxide formation pl+ is 7.
上述の中和により生成した塩Ｎａ１ＳＯ，，Ｋ！ＳＯ４
は、それぞれＮａｘＳＯａ ： ３３０ｇ／ ｊ！ （
液温４０℃） 、Ｋ１ＳＯ４：１９４ｇ／ｊ！ （液
温１００℃）まで増加する。The salt Na1SO,,K! produced by the above neutralization. SO4
are respectively NaxSOa: 330g/j! (
liquid temperature 40℃), K1SO4: 194g/j! (liquid temperature 100°C).
しかし、実験の結果、電解液中に許容できるＮａｚＳＯ
４，に、Ｓ０４ は、それぞれ２００ｇ／ １ 、１０
０ｇ／ １以下ではないと十分な黒色化度を有する黒色
化処理鋼板を製造することが困難であることが分った。However, experimental results show that NazSO is acceptable in the electrolyte.
4, S04 is 200g/1 and 10, respectively.
It has been found that unless it is 0 g/1 or less, it is difficult to produce a blackened steel sheet with a sufficient degree of blackening.
本発明ではＮａｚＳＯａ、 ＊Ｘｓｏ□の低減のため、
温度による溶解度の差を利用する。In the present invention, in order to reduce NazSOa, *Xso□,
Utilizes the difference in solubility due to temperature.
第１図にＮａｘＳＯａ、ＫｚＳＯａの溶解度を示す、こ
の図から明らかなように、ＮａｚＳＯ，＋ ＫｚＳＯ□
をそれぞれ２００ｇ／ １ 、１００ｇ／ ｊ！以下に
低減するためには、中和後の液温を第１表のようにすれ
ばよい。Figure 1 shows the solubility of NaxSOa and KzSOa. As is clear from this figure, NazSO, + KzSO□
200g/1 and 100g/j respectively! In order to reduce the temperature below, the liquid temperature after neutralization should be as shown in Table 1.
第 １ 表
なお、ＮａｇＳＯａ又はに、Ｓ０４以外の溶解塩の濃度
は、すべてこの温度レベルでは飽和濃度よりも低いので
析出することはない。Table 1 Note that the concentrations of all dissolved salts other than NagSOa and S04 are lower than the saturation concentration at this temperature level, so they do not precipitate.
次に、上述の液温下でデカンタ−やフィルター等の固液
分層操作を行なうことにより、電解液中のＮａｚＳＯａ
、 ＫｚＳＯ４の濃度を低減することができる。Next, by performing a solid-liquid layer operation using a decanter, filter, etc. at the above-mentioned liquid temperature, NazSOa in the electrolyte is
, the concentration of KzSO4 can be reduced.
飽和以上のＮａ、ＳＯａ、 ＫｚＳＯ，は固体として電
解液の底に沈んでおり、何ら影響しない。Na, SOa, and KzSO, which are more than saturated, sink to the bottom of the electrolyte as solids and have no effect.
なお、この中和後の液温を２０℃以下にする処理は、電
解液系全体を２０℃以下に保つようにしてもよい。Note that the treatment for lowering the liquid temperature after neutralization to 20° C. or lower may be performed by keeping the entire electrolytic solution system at 20° C. or lower.
以上の説明は、Ｚｎ−Ｎｉ合金めっき綱板を陽極処理す
る場合を例にとったが、本発明はこれに限るものではな
く、他のＺｎ−鉄族系合金めっき鋼板にも適用すること
ができる。Although the above explanation takes the case of anodizing a Zn-Ni alloy plated steel sheet as an example, the present invention is not limited to this, and can be applied to other Zn-iron group alloy plated steel sheets. can.
また、以上の説明では、中和剤としてＮａ０１１゜ＫＯ
Ｈを使用する場合を例にとったが、本発明はこれに限る
ものではなく、他のアルカリ金属又はアルカリ土類金属
の水酸化物又は酸化物を使用することができる。In addition, in the above explanation, Na011゜KO is used as a neutralizing agent.
Although the case where H is used is taken as an example, the present invention is not limited thereto, and hydroxides or oxides of other alkali metals or alkaline earth metals can be used.
他の例として、Ｍｇ５Ｏｎの液温と溶解度の関係を第１
図に示す、 Ｍｇ５Ｏａの場合は溶解度が２４０ ｇ
／ｌ以下でないと十分な黒色化度を有する黒色化処理鋼
板を製造できないので、第１図のように、中和後の液温
を２０’Ｃ以下にすればよい。As another example, let us consider the relationship between liquid temperature and solubility of Mg5On as follows.
As shown in the figure, in the case of Mg5Oa, the solubility is 240 g.
Since it is not possible to produce a blackened steel sheet having a sufficient degree of blackening unless the temperature is below /l, the temperature of the liquid after neutralization may be set to below 20'C, as shown in FIG.
〈実施例〉
Ｎｊ １３ｗｔχ、 Ｚｎ ８７ｗｔχの合金めっき（
めっき付着量２０ｇ／ｍ）を施した鋼板を、ｐｌ＋ ６
〜Ｂ 、 ＮａＮ０＊２０ｇ／ ｊ！ 、 Ｚｎ ５
ｇ／ ｌ、 Ｎｉ １ ｇ／ Ｉ！、及び第２表に
示す濃度のＮａｘＳＯｎ、に２Ｓ０４を含む電解液中で
電気量３００クーロン／ｄ＊”で陽極処理を行った。そ
の結果、本発明例の場合には、良好な黒色化が得られた
。<Example> Alloy plating of Nj 13wtχ, Zn 87wtχ (
A steel plate with a coating weight of 20 g/m) was coated with pl+ 6
~B, NaN0*20g/j! , Zn 5
g/l, Ni 1 g/I! , and NaxSOn at the concentrations shown in Table 2, in an electrolytic solution containing 2S04, with an electrical quantity of 300 coulombs/d*''.As a result, in the case of the example of the present invention, good blackening was achieved. Obtained.
第 ２ 表
〈発明の効果〉
以上説明したように、本発明の方法により、亜鉛−鉄族
系合金めっきｔｉＲ板を陽極処理により黒色化処理する
際に、安定した黒色化度を得ることができ、また電解液
を長寿命化することができる。Table 2 <Effects of the Invention> As explained above, by the method of the present invention, a stable degree of blackening can be obtained when a zinc-iron group alloy plated tiR plate is blackened by anodizing. Moreover, the life of the electrolyte can be extended.
第１図はＮａｚＳＯａ、 Ｋ！ＳＯ４、Ｍｇ５Ｏａの液
温と溶解度の関係を示すグラフである。Figure 1 shows NazSOa, K! It is a graph showing the relationship between liquid temperature and solubility of SO4 and Mg5Oa.
Claims (2)
色化処理する際に、アルカリ金属又はアルカリ土類金属
の水酸化物を用いて電解液のｐＨを５〜１０にすること
により、亜鉛及び鉄族系イオンを水酸化物として沈澱さ
せた後、電解液の液温を２０℃以下に下げて固液分離す
る電解液の再生を行うことを特徴とする黒色化処理鋼板
の製造方法。(1) When blackening a zinc-iron alloy plated steel sheet by anodizing, zinc and a method for producing a blackened steel sheet, which comprises precipitating iron group ions as hydroxides, and then lowering the temperature of the electrolyte to 20° C. or lower to perform solid-liquid separation to regenerate the electrolyte.
色化処理する際に、電解液の循環系全体の液温を２０℃
以下に下げ、かつアルカリ金属又はアルカリ土類金属の
水酸化物を用いて電解液のｐＨを５〜１０にすることに
より、亜鉛及び鉄系イオンを水酸化物として沈澱させた
後、固液分離する電解液の再生を行うことを特徴とする
黒色化処理鋼板の製造方法。(2) When blackening zinc-iron alloy plated steel sheets by anodizing, the temperature of the entire electrolyte circulation system is set to 20°C.
By lowering the pH of the electrolyte to 5 to 10 using an alkali metal or alkaline earth metal hydroxide, zinc and iron-based ions are precipitated as hydroxides, and then solid-liquid separation is performed. A method for producing a blackened steel sheet, which comprises regenerating an electrolytic solution.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7699890A JPH03277798A (en) | 1990-03-28 | 1990-03-28 | Production of blackening treated steel sheet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7699890A JPH03277798A (en) | 1990-03-28 | 1990-03-28 | Production of blackening treated steel sheet |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03277798A true JPH03277798A (en) | 1991-12-09 |
Family
ID=13621450
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7699890A Pending JPH03277798A (en) | 1990-03-28 | 1990-03-28 | Production of blackening treated steel sheet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03277798A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002533573A (en) * | 1998-12-18 | 2002-10-08 | エーヴァルト デルケン アーゲー | Method for blackening surface layer of material piece containing zinc |
-
1990
- 1990-03-28 JP JP7699890A patent/JPH03277798A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002533573A (en) * | 1998-12-18 | 2002-10-08 | エーヴァルト デルケン アーゲー | Method for blackening surface layer of material piece containing zinc |
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