JPS5996292A - Production of steel sheet electroplated on one side - Google Patents

Abstract

PURPOSE:To obtain a steel plate which is electroplated on one side and is improved in chemical convertibility on the non-plating surface in the stage of electroplating one side of the steel sheet by subjecting the non-plating surface to thin plating as well then removing the plating by an electrolytic treatment and forming a passive film. CONSTITUTION:A steel sheet 1 having a top side as a plating surface and the bottom side as a non-plating and negative-impressed surface is passed in the space between anodes 12 and 13 disposed in a vessel 5. Required cathode current is flowed from the anode 12 on the top side to plate the one side of the steel plate and the cathode current necessary for preventing the corrosion of the non- plating side is flowed from the lower anode 13 whereby the non-plating surface is thinly plated thereon. The non-plating surface as an anode is electrolytically treated to remove the plating film from the non-plating surface and to form a passive film. A steel sheet electroplated on one side of which the non-plating surface exhibits excellent chemical convertibility is thus obtd.

Description

【発明の詳細な説明】 この発明は非メッキ面の化成処理性の向上を図った片面
電気メツキ銅板の製造方法に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing a single-sided electroplated copper plate in which the chemical conversion treatment property of the non-plated surface is improved.

片面電気メツキ鋼板に、自動草月銅板の分野において、
高度の合理化要求に応える累月として最近広く用いられ
るようになった。In the field of single-sided electroplated steel sheets and automatic Sogetsu copper sheets,
Recently, it has come to be widely used as a method to meet the demands of high-level rationalization.

白！Ｉｖ＋車用痔−に用いられるメッキ８７１板は、一
般に電熱塗装を行いδらに中塗シ、上塗り塗装を施して
使用されるため、これらの塗装下地処理としてリン酸塩
処理等の化成処理が行われるのが通例である。White! The plated 871 plate used for Iv+ car hemorrhoids is generally electrothermally coated and then δ is coated with an intermediate coat and a top coat, so chemical conversion treatments such as phosphate treatment are performed as a base treatment for these coatings. It is customary to be

この化成処ＪＪＪ　ｆ行うＶＣ１際してに、周知の如く
被処叫金凪面を清順化し、化成皮膜結晶の核発生や成艮
を阻害しないような性状としておく必要がめる。しかし
片面電気メツキ鋼板の非メッキ面ば、片面電気メッキす
る過程でメッキ液により爬食し、その結果表面に生じる
腐食生成物が前記化成皮膜結晶の核発生等を阻害するの
で、非メッキ面の良好な化成処理１生を得るためＶＣは
上記腐食生成物の生成を防止する刀１又は生成した腐食
物を化成処理前に除去しておかなければならない。When carrying out this chemical conversion treatment (VC1), as is well known, it is necessary to clean and condition the surface to be treated so that it has properties that do not inhibit nucleation and growth of chemical conversion film crystals. However, the non-plated surface of a single-sided electroplated steel sheet is corroded by the plating solution during the single-sided electroplating process, and the resulting corrosion products generated on the surface inhibit nucleation of the chemical conversion coating crystals, so the non-plated surface is In order to obtain a suitable chemical conversion treatment, the VC must be used to prevent the formation of the above-mentioned corrosion products or the generated corrosives must be removed before the chemical conversion treatment.

上記非メッキ面の腐食生成物に対する対策とじてに従来
一般に、生成した腐食生成物をメッキ後に除去する方法
が行われている。すなわち、上記腐食生成物の付着状態
が極めて強固で、通常の簡単な水洗等でに完全除去が困
蝉、であるので、■メッキの後処理として特別に非メッ
キ面を根城的に研磨する工程を設けて表面黄色層や；１
」モ食残存物等を除去する方法、■メッキ後酸中で電解
酸洗して腐食生成物を除去し、次いでＺｎ等の特定の金
属の（τ（微−１１ｉを表面に分散して析出δせてメッ
キし、化成処３．！Ｉ！左を向上する方法等である。Conventionally, as a countermeasure against the corrosion products on the non-plated surface, a method has been generally used in which the generated corrosion products are removed after plating. In other words, the adhesion of the above-mentioned corrosion products is extremely strong and it is difficult to completely remove them by ordinary simple washing with water, etc. Therefore, as a post-plating treatment, a process of thoroughly polishing the non-plated surface is necessary. by providing a yellow layer on the surface; 1
``Method of removing corrosion residues, etc.'' After plating, electrolytic pickling in acid is performed to remove corrosion products, and then specific metals such as Zn (τ This method includes plating with δ and improving the chemical treatment 3.!I!Left.

しかじ■の表面０（磨の方法では腐食生成物の完全除去
のためには多段の研磨設備を必要としコストが嵩むばか
りでなく、仮りに除去できたとしても研磨の程度によっ
て化成処理の際の化成結晶の大きさにムフを生じ化成処
理性が損われるという問題、また必然的に朝磨痕が残り
、程度によっては塗装性（塗装仕上り外観および耐食性
）Ｖこ影υを及ぼす間Ｍｌｉがある。−！た研磨後の水
洗の際に非メッキ面に歿年する水膜によシ水酸化物の黄
色錆な生じ、このため化成処理性が劣化するという問題
もある。(The polishing method requires multi-stage polishing equipment to completely remove corrosion products, which not only increases costs, but even if it can be removed, it may be difficult to remove the corrosion products during chemical conversion treatment depending on the degree of polishing.) The problem is that the size of the chemical crystals becomes muffy, impairing the chemical conversion processability, and that it inevitably leaves scratches, and depending on the degree, it affects the paintability (paint finish appearance and corrosion resistance). There is also the problem that when washing with water after polishing, a water film forms on the non-plated surface and causes yellow rust of hydroxide, which deteriorates chemical conversion properties.

■の特定金属をメッキする方法は、非メッキ面にのみ特
定金属を析出でせるためにば、例えばラジアルセルの如
き特定の設備を必要とし経費が嵩むばｙｉｈ９でなく、
通常酸性のメッキ液が用いられるので・メツキイ曹中で
本来の片面メッキ皮１喚の熔解あるいに変色等が起り、
片面電気メツキ鋼板の商品価値荀大きく損じる恐れが多
分にある。The method (2) of plating a specific metal requires specific equipment, such as a radial cell, to deposit the specific metal only on the non-plated surface, which increases costs.
Since an acidic plating solution is usually used, the original single-sided plating layer may melt or change color in the soap solution.
There is a strong possibility that the commercial value of single-sided electroplated steel sheets will be significantly damaged.

そこで上記■＠の従来方法に代えて非メッキ面に、より
すぐれた化成処理性を付与し得るような片面軍、気メッ
キ鋼板の製造方法の開発が望まれていた。Therefore, it has been desired to develop a method for producing a single-sided, air-plated steel sheet that can impart better chemical conversion treatment properties to the non-plated surface in place of the conventional method described in (1) above.

本発明は上記要望に応えるためになでれたものであって
、従来の非メッキ面に生成した腐食生成物を除去する方
法に代えて、メッキ過程で非メッキ面にもメッキを施し
て腐食の発生を防止し、メッキ後に非メッキ面を陽極と
する電解処理を行って前記メッキ皮膜を除去して非メッ
キ面の化成処理性の向上ヲ丙るようにした片面電気メッ
キ鋼板の製造方法を提供するものである。The present invention was developed in response to the above-mentioned needs, and instead of the conventional method of removing corrosion products generated on non-plated surfaces, it is possible to apply plating to non-plated surfaces during the plating process. A method for manufacturing a single-sided electroplated steel sheet, which prevents the occurrence of oxidation, and improves the chemical conversion treatment properties of the non-plated surface by performing electrolytic treatment using the non-plated surface as the anode to remove the plating film after plating. This is what we provide.

本発明者らは、メッキ液中での非メッキ面の腐食を防止
して清浄化を保持し、化成処理性の向上を図るべく種々
英検、研究を重ねた。その結果、メッキに際して非メッ
キ面にも陰極電流を流して薄目付（’ｉ’、のメッキを
施すことによシ、メッキ液中での非メッキ面の厄介を完
全に防止することができ、δらにメッキ処理後に非メッ
キ面を陽極として電解することによって前記非メッキ面
のメッキ皮膜を除去し得るとともに除去後の非メッキ面
に不働態皮膜が形成され、メッキ後の非メッキ面の化成
処１■性を冷延鋼板数のすぐれた水準に保ち得るという
新らたな事大を知見しだ。The present inventors have carried out various English tests and research in order to prevent corrosion of the non-plated surface in the plating solution, maintain cleanliness, and improve chemical conversion treatment properties. As a result, by applying cathode current to the non-plated surface during plating and applying plating with a thin coating weight ('i'), it is possible to completely prevent the non-plated surface from being troublesome in the plating solution. After plating, the plating film on the non-plated surface can be removed by electrolyzing the non-plated surface as an anode, and a passive film is formed on the non-plated surface after removal. We have discovered a new important point: that it is possible to maintain the processing properties of cold-rolled steel sheets at an excellent level.

非メッキ面にも陰極電流を流してメッキを施し、でらに
メッキ後に非メッキ面を陽（茎として電解処理しようと
するに際して、上記非メッキ面の薄目付量のメッキを得
るために必要とてれる最適の陰（冨電流密度ば、ライン
スピード、液流速、湿度、ｐＨ等のメッキ条件の変化に
よシ変動がいるが、基本的には次のような考え方のもと
に決定される。Plating is applied to the non-plated surface by passing a cathode current, and after plating the non-plated surface is electrolytically treated as a stem. Although there are variations due to changes in plating conditions such as current density, line speed, liquid flow rate, humidity, pH, etc., the optimum value to be achieved is basically determined based on the following concept. .

すなわち、メッキ槽でメッキが行われるのに、通過する
′ｆ、ｌｉｍ板に相別する陽電極が存在する区間であり
、存在しない区間ではメッキ液による腐食が起る。そこ
でとの腐食を防止するために必要とするメッキの目付気
は、最終メッキ槽出側の陽極の存在しない区間において
、メッキ皮膜がメッキ液によシなくならない程度の薄目
付量で十分でいり、前記薄目付量を得るに要する陰版電
流密度を最適とする。この理由は、前記メッキ皮膜は、
メッキ後非メッキ面を賜（テとする電解処理によυ除去
するものであるが、このメッキ皮膜が薄目付である程電
解による除去ぼ容易であり、かつ電解に要する陽極電流
密度も小さくて済み、電力費用の低減にもつながり有利
となる〃１らである。That is, there are sections where separate positive electrodes are present on the 'f and lim plates that pass through the plating bath, and corrosion due to the plating solution occurs in sections where no positive electrodes are present. The plating weight required to prevent corrosion there is sufficient to be thin enough that the plating film will not be damaged by the plating solution in the section where there is no anode on the exit side of the final plating tank. , the negative plate current density required to obtain the above-mentioned thin area weight is optimized. The reason for this is that the plating film is
After plating, the non-plated surface is removed by electrolytic treatment, but the thinner the coating, the easier it is to remove by electrolysis, and the lower the anode current density required for electrolysis. This is advantageous as it also reduces electricity costs.

次Ｖこメッキ後、非メッキ面を陽（ンとし、電解液組成
お工び液流速、ｐＨ、＞′流密度等の電解条件をライン
スピードに対応して適正として電解すると、非メッキ面
に金属の浴ｌｊイ反応および檄しい酸素発生反応を生じ
、これらの反応により非メッキ面のメッキ皮膜（１除去
され、また上記電解によってメッキ皮膜除去後の非メッ
キ面に不働態皮膜が生成される。この不イ動態化によっ
て、’に解後の水洗時に発生する錆層の生成が効果的に
阻止てれる。Next, after V-plating, the non-plated surface is electrolyzed with the electrolyte composition, flow rate, pH, >' flow density, etc. set appropriately according to the line speed. A metal bath reaction and a dangerous oxygen generation reaction occur, and these reactions remove the plating film (1) from the non-plated surface, and the electrolysis generates a passive film on the non-plated surface after the plating film has been removed. This passivation effectively prevents the formation of a rust layer that occurs when washing with water after decomposition.

またこの不働態化された非メッキ面は化成処理に際して
、酸化物の緻密な薄１換である不＠態皮膜に不均一、局
所的な溶解を生じ、アノード部、カソ−Ｆ部の固定がな
く、化成皮１ｊす、ｌＪ晶の＋に発生や成（（がスムー
ズＶＣ進行し、良好な化成処１．ｌｊ性を示すことが明
ら〃ｓとなった。In addition, during chemical conversion treatment, this passivated non-plated surface causes non-uniform and local dissolution of the passive film, which is a dense thin layer of oxide, and the fixation of the anode and catho-F sections becomes impossible. It was found that the formation and formation of the chemical skin 1j and lj crystals progressed smoothly and showed good chemical conversion properties.

不発明、な上詑知見ＶＣ基いてなされたもので、七〇彎
ｈ′とするところは、片面？ｌｊ’、気メッキ１１．・
、１板の１時迫において、〕１：メッキ而にも１・−）
陸軍ｂ１εを流してンｉ；・目（：］’　４ｉの″ＩＬ
ｌ″気メッキ全メッキしがる後！ｊＪ　：！己卯メッキ
面を陽（、・ぴ：として市、（イし、１ｉｉＪ詔、７１
ヱ１〕・ｌ’ｌ／こよる非メッキ面（７）　ｉか１ｉ１
′反応および酸；ｉ・“、発生反応によって非メッキ面
のメッキ皮１漢を除去するとともにｒｉｉＪ記７１ｊ　
ｉｌｌ’ｉ′（ｌこより非メッキ面Ｖ（不；−・’Ｉ　
：’ｍ皮１０を生成σぜること１／Ｃ，ＬＩ）、シｌリ
ッギ面の化成処理１１０荀向上乎−じ−局ことを隼、冒
ｊンとする）４面一り気メッギｊ：ｌ１ｉｌ　：１反の
ル２足１カ゛ｌ去にある。It is uninvented, and it was made based on the knowledge of VC, and the place where it is called hexacurvature h' is one side? lj', air plating 11.・
, at 1 o'clock on the 1st board,] 1: plated and also 1・-)
The Army b1ε is flowing.
After plating all of the plating!
ヱ1〕・l'l/Koyoru non-plated surface (7) i or 1i1
``Reaction and acid; i・``, remove the plating skin on the non-plated surface by the generated reaction, and remove the plating skin from the non-plated surface, and
ill'i'(l) Non-plated surface V
：'m skin 10 is generated σ to 1/C, LI), the chemical conversion treatment of the 110 yen surface is considered to be a blasphemy) 4 surfaces are 1/C, LI). :l1il: 2 legs of 1 counter are 1 corner away.

次に不発明の片面市；気メッキ↑：’］’汲の製ｊ告方
法を１ヌ：　１１１ｉ　ｔ／Ｃ、ｊ；！ｘいて説明する
。Next, the uninvented one-sided market;Ki plating ↑:']'The method of manufacturing J: 111i t/C, j;! x and explain.

！：’Ｉｓ　１図に不九明方法の一例を示す片面電気メ
ツキラインの秘弐図である。図１において、アンコイラ
−（２）からｕ！、　ｉり°訂１勺に送り出てれる鉗ｉ
板（１）に脱ｊ指（φ１１（３）、／Ｊ（６１：　４・
！’ｔ　（４］　’に経て、メッキ、１１．！ｉ　（９
）に入りメッキ而番で所要の片面市；気メッキを確丁と
ともに非メッキｍｊにも薄Ｉｔ　（＝１１．、・をメッ
キを施した浚、水洗（′ｊ屓６）を経て処１４１ｊ　１
ｊｌｉ　（７）に入る。処理、（〜１１１（７）におい
て非メッキゴ１１を陽（１ブとする’１ｔｃｉｑ了を行
った後、水洗槽（８）、乾燥装置＋′’ｔ　（Ｑ）企宗
ドて１１丁びリコイラー〇〇）で：コイルに巻取られて
次工程に送られる。! :'Is Figure 1 is the second diagram of a single-sided electroplating line showing an example of the non-Kunmei method. In FIG. 1, from the uncoiler (2) to u! , The force that is sent out for the first time
Remove the J finger (φ11 (3), /J (61: 4.
! After 't (4] ', plating, 11.!i (9
), then plated and plated one side as required; apply plating to the non-plated mj as well as thin plated mj (=11.,・), wash with water ('j 屓6), and then process 141j 1
Enter jli (7). After processing, (~111(7), remove the non-plated steel 11 as 1 tciq, wash tank (8), drying device +''t (Q) 11th plated plate and recoiler. At 〇〇): It is wound into a coil and sent to the next process.

第２［χ１げ上記メツキイｉ’ｆｔ５）のゎｃ１析正而
因でβす、しＩ（Ｃおいて、αｊＬ］　４反（１）は上
側をメッキ面、下側を非メッキ：ｉ’ｌ！　トＬ　ＴＺ
　ｌ会Ｊ’１ｊｉｉ　Ｉ／Ｃ印加δれて、４：ｉ、’ｑ
　（５）内ツメツキ液（１υ中ＶＣおいて上下に配置投
芒れた陽電版αの、０■の１ハル〕川板する。−′Ｃの
際、上は用の陽電位（０ツからに常法に従って所要の陰
版電流（矢印］４で示す）を流して７３１Ｔ要の片面メ
ッキを行うとともに、下側のドア化（ジ（１３７１・ら
に非メッキ面の１１６食防止に必要な陰１−ヂ電流（矢
印１５で示す）を流して％、ｌ、ｉ目イ］量のメッキを
行うのである。Due to the ゎc1 analysis of the second [χ1 and the above metsuki i'ft5), it is β. l! L TZ
l meeting J'1jii I/C application δ, 4:i,'q
(5) Inner plucking liquid (1 hull of 0 ■ of the positive electric plate α placed above and below in VC during 1υ) is applied to the river plate. At -'C, the top is the positive potential (from 0 to Apply the required negative plate current (indicated by arrow 4) to the plate according to the usual method to plate one side of 731T, and also apply the required negative plate current (indicated by arrow 4) to the lower door (1371 and 116 to prevent corrosion on the non-plated surface). A negative current (indicated by arrow 15) is applied to perform plating in an amount of %, l, i-th a].

第１図に示した処理（’Ｑｕ　（７）中の７Ｅ解液とし
ては常月Ｊ（７）Ｎ（３，ｒＳＯａ　、ＮａｙＳＯｇ　
＋ＮａＯＨ，Ｎａ２ＣＯＪ　、Ｎａ−Ｂ２０７偶゛の溶
ど夜が列上イられ、Ｉ’Ｊａ、２ＳＯｕ　、　Ｎａ２Ｃ
ＯＪ、　Ｎａ、Ｊ３ｙ０２の沢度としては５〜１５％７
．５１反が好ましい。７「解液の洗１度に３５〜５０′
Ｃ程度、ｐＨにメッキ面への金属析出を考ｊ１・＆する
と８〜１２が適当と考えられる。はた′直（ヱｌＡＬ比
′度は非メッキ曲刃・らの４１．・メッキ皮膜の除去お
よび非メッキ面の不４ＭＩ　ｆ１４化に必要な′Ｉｌｌ
：解電７〕１しが得られる１、ｈ一度とする必′彎が８
る。この所′隻のＴＩＬｌ：流密度に１、ｉｂ’、）イ
液の組成、１）Ｉ−Ｉ、ラインヌビ−１：′Ｉ９．の電
解条件により種々異なるが、例えば７ニＩ’ｒ’Ｋ　液
が１５ＸＩＸノａ、ｚｓＯｇ　＋　１’ＪａＯＨ，ｐＨ
８，−、ｉ　インｙｌビ１”　１００ｎ／Ｓ　（Ｄ　屯
１１＋′ｌ’　条件ｆｉ、、Ｉ、８０Ａ／（］Ｊ１１２
０屯流密度を心安とするが、上記と同じシインスビ−１
−゛で電解液ＶＣ＝１ニー解効率（油’ｉｌｉ：　’ｌ
ｊｃに７・１する不：・：、□）態化に裳する電流の”
、１１１ｉ合）の「１１」い灰酸イオンを含む１０Ｘ’
　ＮａＪ　ＣＯＪ　ｉ′ｉ’；　７１ｋ”、Ｃ用Ｖｓ　
”ＴＺ　ｐＨ１２ト−ｒ　ｈ　ｋ！、所要ノミ流密度に
６０１し官Ｉ】］２で十分となる。二層’ｔ＝　ｌＩｒ
＋　ｈ〜」、のフインスビーＦて′１１イ厘１′液に１
０％Ｎ　Ｏ，ノ：・（’Ｊｚ　−１−１０Ｘ１＼ｌａ、
ｒ　ＣＯｉ　’、１）旧１．ｎ　ｐＪ−Ｉ　ｔ　２とす
れば、芒らｔｉｃ’山、）ら′１′効率は高くなり４　
’ＯＡ／ｃＬｍ２の電７ＡＥ’序１反で十分となる。As the 7E solution in the treatment shown in Figure 1 ('Qu (7)), Tokotsuki J (7) N (3, rSOa, NaySOg
+NaOH, Na2COJ, Na-B207 even melting night is on the line, I'Ja, 2SOu, Na2C
The degree of abundance of OJ, Na, J3y02 is 5-15%7
．． 51 tan is preferred. 7 "35 to 50' per wash of solution
Considering the metal precipitation on the plating surface at a pH of about C, a value of 8 to 12 is considered appropriate. Straight (the AL ratio is 41.0% for non-plated curved blades.・Ill required for removing the plating film and converting the non-plated surface to 4MI f14.
: Electrolysis 7] 1 is obtained 1, the necessity to do it once is 8
Ru. At this point, TILl of the vessel: 1 for flow density, ib',) Composition of liquid, 1) I-I, Line Nuvi-1:'I9. Although it varies depending on the electrolytic conditions, for example, 7I'r'K solution is 15XIX a, zsOg + 1'JaOH, pH
8,-,i inylbi1" 100n/S (D tun11+'l' condition fi,,I,80A/(]J112
0 ton flow density is safe, but the same Shinsbee-1 as above
−゛ and electrolyte VC = 1 knee solution efficiency (oil 'ili: 'l
7.1 to jc :・:, □) of the current to be transformed into
, 111i) containing "11" ash ions
NaJ COJ i'i';71k", Vs for C
"TZ pH 12 t-r h k!, 601 to the required chisel flow density]] 2 is sufficient. Two layers 't = lIr
+ h~'', Finsby F '11 I 1' liquid 1
0%NO,ノ:・('Jz -1-10X1\la,
r COi', 1) Old 1. If n pJ-I t 2, the efficiency will be high and 4
'OA/cLm2 Electric 7AE' order 1 turn is sufficient.

次に本発明の’Ｊ＝ｊ　Ｉｊ但例について説明する。Next, an example of the present invention where 'J=j　Ij will be explained.

ハ面軍気鉄−亜鉛メッギ銅；板の製造フィンにおｐＨ２
，浴温５ｏｃとして９００　Ｍｍ巾×０８〜厚の冷延鋼
板に目付ｆｉ、ｉ　３５　ｇ／□２の片面電気鉄−亜鉛
メッキを施すとともに、非メッキ面ＶＣ目イχ１量８　
ｇ／ｍ’の同様の薄メッキを施した後、第１図の処理オ
・旧７）にて非メッキ面を陽（１鷺とし、電解液組成、
ｐＨを種々ＩＣＵえてラインヌビーＦ’　１００　ｍ／
ｓで、非メッキ面の不イ・、τｊ態化に十分な電ｌ、１
シ密度の電１１１１　？！尤流を通して電解処理を行い
本発明例の供試材１〜４を得／ζ。捷た比１咬のため、
上記と同様に片面゛１１Ｌ気鉄＼ 一亜鉛メツキ１１１１′ｄ板を製造し、非メッキ面（ｔ
こメッキを施さず、かつ電解処理を行わないで比１板例
の供試イ／１５を得た。ひきつづいて上記各供試インを
市販のリン酸ヱｌｌｉ　ｊ’ｎ処川！用ｒＪ（ＢＴ８０
３０商品名、日本パーカー社製）ｖＣ侵漬して化成処理
を行い化成処理１生の良否を調査した。上記各供試イン
のメッキ後捷たは電解後の外観（灸査および化成処理性
の調査結果ケ第１表（でまとめて示す。Hamen Gunki Iron - Zinc Meggi Copper; pH 2 for plate manufacturing fins
, At a bath temperature of 5oc, a cold-rolled steel plate of 900 mm width x 08~thickness is coated with electric iron-zinc plating on one side with a basis weight fi, i 35 g/□2, and the non-plated side VC eye is χ1 amount 8.
After applying a similar thin plating of g/m', the non-plated surface was made positive (1) using the treatment O/former 7 in Figure 1, and the electrolyte composition was changed.
Line Nuvie F' 100 m/
At s, sufficient electric current l, 1 to transform the non-plated surface into a
Density Density 1111? ! Test materials 1 to 4 of the examples of the present invention were obtained by electrolytic treatment through a forced current/ζ. Because it was only one bite,
In the same manner as above, a single-sided ``11L iron plated 1111''d plate was manufactured, and the non-plated side (t
A sample A/15 of a comparison plate was obtained without plating or electrolytic treatment. Continuing, each of the above test compounds was added to commercially available phosphoric acid. for rJ (BT80
30 (trade name, manufactured by Nippon Parker Co., Ltd.)) was immersed in vC and subjected to chemical conversion treatment, and the quality of the chemical conversion treatment 1 product was investigated. The appearance after plating or electrolysis of each of the above-mentioned sample insulators (the results of moxibustion and chemical conversion treatment are summarized in Table 1).

第１表 表中、外観評価ｌｉ＆ｄの○印は銀白色の美麗な不働態
皮膜が生成でれ良好なもの、Ｘ印に腐食生成物による黒
変個所が多く不良なものを示す。また化成処理性評価欄
の○印は化成結晶が微細でかつ緻密に生成し良好なもの
、Ｘ印は化成結晶が粗大でかつまばらで不良なものを示
す。In Table 1, marks ◯ for appearance evaluation li&d indicate good results with a beautiful silver-white passive film formed, and marks X indicate poor results with many black discolorations due to corrosion products. Further, in the chemical conversion treatment evaluation column, the mark ○ indicates that the chemical crystals are fine and densely formed and is good, and the mark X indicates that the chemical crystals are coarse and sparse and poor.

表に見る通り、比較例５はメッキ工程において非メッキ
面にメッキを施さなかったため非メッキ面ＶＣ腐食生成
物が多くイτ１にして汚染てれており、化成処理性が不
良でめった。これに対し本発明例・はいずれも電解によ
り非メッキ面のメッキ皮膜示完全に除去妊れしかも除去
後の非メッキ面には美麗な不（ｌＴｉｉｌ態皮膜が生成
てれ、良好な化成処理性が得られた。本発明例１は電解
液に１５％のＮａ、ｚｓＯ４を溶液を用いた代表的な電
解例で、！−）υ、本発明例２．３は電解液に電解効率
の高い炭酸イオンを含む溶液を用いて電流密度を低減さ
せて電力費用の節減を図った電解例、本発明例４げ電解
液に５％Ｎａ２Ｂ、２０７溶液を用いて電流密度の低減
を図った例である。As shown in the table, in Comparative Example 5, the non-plated surface was not plated in the plating process, so the non-plated surface was contaminated with a large amount of VC corrosion products at τ1, and the chemical conversion treatment was poor. On the other hand, in all of the examples of the present invention, the plating film on the non-plated surface was completely removed by electrolysis, and a beautiful Tiil state film was formed on the non-plated surface after removal, resulting in good chemical conversion treatment properties. Inventive Example 1 is a typical electrolysis example using a solution containing 15% Na and zsO4 in the electrolytic solution, and Inventive Example 2.3 is a typical electrolytic example using a solution containing 15% Na and zsO4 in the electrolytic solution. An electrolysis example in which a solution containing carbonate ions was used to reduce the current density to reduce electricity costs, and an example in which the current density was reduced by using a 5% Na2B and 207 solution as the electrolyte. be.

以上の説明から明らかなように、本発明の片面電気メツ
キ鋼板の製造方法に、メッキ工程において非メッキ面（
（も薄目付量のメッキを施し、しかる後非メッキ面を陽
極とする電ｆＱτ処理を行うという新規な方法で、清浄
な非メッキ面が得られるとともに、非メッキ面を不＠態
化することによって化成処理性にすぐれた非メッキ面ケ
有する片面電気メツキ鋼板が得られるので、片面電気メ
ツキ鋼板の品質の向上、製造コヌトの低減に顕著な効果
を元押する。As is clear from the above explanation, in the method for producing a single-sided electroplated steel sheet of the present invention, the non-plated surface (
(This is a novel method in which a thin layer of plating is applied, and then an electric fQτ treatment is performed using the non-plated surface as an anode.A clean non-plated surface can be obtained, and the non-plated surface can be made passivated.) As a result, a single-sided electroplated steel sheet having a non-plated surface with excellent chemical conversion treatment properties can be obtained, which has a significant effect on improving the quality of single-sided electroplating steel sheets and reducing manufacturing costs.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は本発明方法を笑施する連続片面電気メツキライ
ンの一例を示す模式図、第２図は本発明方法におけるメ
ッキＩ’１７１ｊの一例を示す説明図で縦断正面図であ
る。 １：鋼板、２：アンコイツー、３：脱脂槽、４．６．８
：水洗イ１ｑ、７：処理槽、９：乾燥装置、ＩＯ＝リコ
イラー、１１：メッキ液、１２．１３：陽電極、１４．
１５：陰極電流 出願人　　住友金属工業株式会社 代理人弁理士　生　形　Ｘ　　重FIG. 1 is a schematic diagram showing an example of a continuous single-sided electroplating line to which the method of the present invention is applied, and FIG. 2 is an explanatory diagram showing an example of plating I'171j in the method of the present invention, and is a longitudinal sectional front view. 1: Steel plate, 2: Ancoi two, 3: Degreasing tank, 4.6.8
:Water wash 1q, 7: Processing tank, 9: Drying device, IO=recoiler, 11: Plating solution, 12.13: Positive electrode, 14.
15: Cathode current applicant Sumitomo Metal Industries Co., Ltd. agent patent attorney

Claims (1)

【特許請求の範囲】[Claims] （１）片面電気メツキ鋼板の製造において、非メッキ面
にも陰極電流を流して薄目付量の電気メッキを行い、し
避る後前記非メッキ面を陽極として電解し、前記電解°
による非メッキ面の溶解反応および酸累発生反応によっ
て非メッキ面のメッキ皮膜を除去するとともに前記電解
により非メッキ面に不働態皮１１ｄ％を生成させること
により、非メッキ面の化成処理１住を向上させることを
特徴とする片面電気メツキ鋼板の製造方法。(1) In the production of single-sided electroplated steel sheets, a cathode current is also applied to the non-plated surface to electroplat a thin coating weight, and after the electroplating is conducted, the non-plated surface is used as an anode to electrolyze the electroplated surface.
The plating film on the non-plated surface is removed by the dissolution reaction and acid accumulation reaction on the non-plated surface, and 11d% of a passive film is generated on the non-plated surface by the electrolysis, thereby performing chemical conversion treatment on the non-plating surface. A method for producing a single-sided electroplated steel sheet, characterized by improving