JPH0784679B2 - Purification method of electrolytic zinc plating bath - Google Patents
Purification method of electrolytic zinc plating bathInfo
- Publication number
- JPH0784679B2 JPH0784679B2 JP99992A JP99992A JPH0784679B2 JP H0784679 B2 JPH0784679 B2 JP H0784679B2 JP 99992 A JP99992 A JP 99992A JP 99992 A JP99992 A JP 99992A JP H0784679 B2 JPH0784679 B2 JP H0784679B2
- Authority
- JP
- Japan
- Prior art keywords
- filter
- plating bath
- zinc
- powder
- 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.)
- Expired - Fee Related
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D21/00—Processes for servicing or operating cells for electrolytic coating
- C25D21/06—Filtering particles other than ions
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、電解亜鉛めっきに使用
されて劣化した電解浴、特にアルカリ性亜鉛めっき浴中
に蓄積した不純物を除去して再使用可能な亜鉛めっき浴
を回収するための電解亜鉛めっき浴の精製法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrolytic bath for use in electrolytic galvanizing, which is used for electrolytic galvanizing to remove impurities accumulated in an alkaline galvanizing bath and recover a reusable galvanizing bath. The present invention relates to a zinc plating bath refining method.
【０００２】[0002]
【従来の技術】鋼板等を防食するために亜鉛めっきを施
す方法が利用されており、性能の均一性などの点から溶
融亜鉛めっきよりも電解亜鉛めっき、特にアルカリ性亜
鉛めっきが好まれるに至っている。こうした電解亜鉛め
っき法においては、基材の表面から種々の金属イオンが
めっき浴中に溶出して蓄積するためにめっき浴が次第に
劣化し、電流密度の低い部分が黒くなったり、或いはめ
っき製品を更に耐食化するためのクロメート処理に際し
て黒化が著しくなるなどの不都合が生ずる。2. Description of the Related Art Galvanizing is used to prevent corrosion of steel sheets, etc., and electrolytic zinc plating, especially alkaline zinc plating, has been preferred to hot dip galvanizing from the viewpoint of performance uniformity. . In such an electrolytic zinc plating method, various metal ions are eluted from the surface of the base material and accumulated in the plating bath, so that the plating bath is gradually deteriorated, a portion having a low current density becomes black, or the plated product is Further, in the chromate treatment for corrosion resistance, blackening becomes remarkable and other inconveniences occur.
【０００３】そこで劣化したアルカリ性電解亜鉛めっき
浴を再使用可能なまでに精製することが行なわれてお
り、例えば弱い電解条件で亜鉛めっき浴を電解処理して
不純物を優先的に除去する方法や、例えば硫化アルカリ
溶液を添加して不純物を不溶性硫化物に転化し、或いは
金属亜鉛粉末を添加混合して不純物を不溶性の金属や金
属酸化物等に転化したのち、これらの不溶性析出物を濾
別するという化学的精製方法が用いられている。そして
そのうちでも、亜鉛めっき浴を汚染することが少ない金
属亜鉛粉末処理方法が好まれている。Therefore, the deteriorated alkaline electrolytic zinc plating bath is being purified to the extent that it can be reused. For example, a method of electrolytically treating the zinc plating bath under weak electrolytic conditions to remove impurities preferentially, For example, an alkali sulfide solution is added to convert impurities to insoluble sulfides, or metal zinc powder is added and mixed to convert impurities to insoluble metals or metal oxides, and then these insoluble precipitates are filtered off. That chemical purification method is used. Among them, a metal zinc powder treatment method that hardly pollutes the zinc plating bath is preferred.
【０００４】上記のような金属亜鉛粉末を用いる化学的
精製方法においては生成する沈殿が微細であるために、
珪藻土等を濾過助材としてプリコートした濾材を備えた
濾過機を用いて、電解液中に残った金属亜鉛粉末と沈殿
とを一緒に加圧濾過して除く方法があるが、この方法で
は電解液と金属亜鉛粉末とを混合して反応させるための
装置が必要となる不利がある。そのため、プリコートし
た濾過助材層の上に更に金属亜鉛粉末を２次コートした
濾材を備えた濾過機を用いて劣化した電解亜鉛めっき浴
を濾過すると同時に反応させ、めっき浴の精製が終了し
たのちに濾材を取り外して洗浄することによって濾過助
材と金属亜鉛粉末と沈殿との混合物を洗い落とし、廃棄
処理するのが普通であった。In the chemical refining method using the metallic zinc powder as described above, since the precipitate produced is fine,
Using a filter equipped with a filter material precoated with diatomaceous earth as a filter aid, there is a method to remove the metal zinc powder remaining in the electrolyte solution and the precipitate by pressure filtration together. There is a disadvantage in that a device for mixing and reacting with the zinc metal powder is required. Therefore, the deteriorated electrolytic zinc plating bath is filtered and reacted at the same time using a filter equipped with a filter material on which a metallic zinc powder is secondarily coated on the precoated filter aid layer, and after the plating bath is purified. It was usual to remove the filter medium and wash it to wash away the mixture of the filter aid, the metallic zinc powder and the precipitate, and dispose of it.
【０００５】しかしこのような回分式の濾過方法は多大
の作業労力が必要であり、運転効率も高めることができ
ないという欠点があるほか、洗浄液の処理が簡単でなく
環境汚染を引き起こしやすいという問題もあった。そこ
で濾材の自動逆洗が容易であって運転効率を高くするこ
とができる筒状濾材を設けた回分式濾過機を用いて電解
亜鉛めっき浴の濾過精製を行い、逆洗によって一時に排
出される濾過助材を含む濾滓の泥状混合物を別途用意し
たタンク式濾過脱液機に直送し、濾滓から濾液を回収す
ると同時に脱液濾滓を取り出す方法の採用が検討され
た。However, such a batch-type filtration method has a drawback that it requires a great deal of work and labor and the operation efficiency cannot be increased, and that the treatment of the cleaning solution is not easy and environmental pollution is likely to occur. there were. Therefore, automatic backwashing of the filter medium is easy and the operating efficiency can be improved. The electrolytic zinc plating bath is filtered and purified using a batch type filter equipped with a tubular filter medium, and is temporarily discharged by backwashing. A method was considered in which a mud-like mixture of the filter residue containing the filter aid was directly sent to a separately prepared tank-type filter dewatering machine to collect the filtrate from the filter residue and at the same time remove the dewatered filter residue.
【０００６】[0006]
【発明が解決しようとする課題】ところがこの方法で電
解亜鉛めっき浴の濾過精製を行ってみると、濾過脱液機
内で金属亜鉛粉末を含む脱液濾滓が空気と接触して発熱
反応を起こし、脱液機の濾材が損傷して自動運転ができ
ないという問題があることが判明した。However, when filtering and refining the electrolytic zinc plating bath by this method, the dewatering filter containing metal zinc powder comes into contact with air in the filtering dewatering machine to cause an exothermic reaction. It was found that there was a problem that the filter material of the dewatering machine was damaged and automatic operation was not possible.
【０００７】そこで本発明は、金属亜鉛粉末を濾材上に
コートした回分式濾過機を用いて劣化したアルカリ性電
解亜鉛めっき浴を精製するにあたって、濾過脱液機に損
傷を与えることなく安全に効率的な連続自動運転を実施
することができる改良された濾過機の運転方法を提供し
ようとするものである。Therefore, in purifying a deteriorated alkaline electrolytic zinc plating bath using a batch type filter in which metallic zinc powder is coated on a filter medium, the present invention is safe and efficient without damaging the filter drainer. It is an object of the present invention to provide an improved method for operating a filter, which can perform continuous automatic operation.
【０００８】[0008]
【課題を電解するための手段】上記の目的を達成するた
め、本発明の電解亜鉛めっき浴の精製法は、金属亜鉛粉
末を含むプリコート層を設けた濾材を有する回分式濾過
機を用いて電解亜鉛めっき浴の濾過精製を行なった後、
該回分式濾過機を逆洗して該濾材から脱離した金属亜鉛
粉末を含む懸濁液をタンク式濾過脱液機に直送し濾滓を
分離回収するに当たり、あらかじめ濾過助材の分散液を
順方向に通過させて１次コート層を該濾材上に形成し、
次いで金属亜鉛粉末と濾過助材との混合分散液を順方向
に通過させるか又は金属亜鉛粉末の分散液と濾過助材の
分散液とを逐次に順方向に通過させて金属亜鉛粉末と濾
過助材とからなる２次コート層を該１次コート層上に形
成し、しかるのちに該めっき浴の濾過精製を行なうよう
にした。In order to achieve the above object, a method for purifying an electrolytic zinc plating bath of the present invention is a metal zinc powder.
Batch type filtration having a filter medium provided with a precoat layer containing powder
After carrying out filtration purification of the electrolytic zinc plating bath using a machine ,
Upon the filter cake was direct a suspension containing metal zinc powder desorbed the該回content type filter device from backwashing to filtrate material tank type filtration drainer unit to separate and recover, dispersion of pre-filter aid to
Forming a primary coat layer on the filter medium by passing in the forward direction ,
Next , the mixed dispersion liquid of the metallic zinc powder and the filter aid is moved in the forward direction.
Of the metal zinc powder and the filter aid
Sequentially pass through the dispersion liquid in the forward direction to obtain zinc metal powder and a filter.
A secondary coat layer consisting of an over-assisting material is formed on the primary coat layer.
Form, and to perform the filtration purification of the plating bath after accordingly.
【０００９】本発明の電解亜鉛めっき浴の精製法におい
ては、濾過助材として珪藻土が用いられるが、その他パ
ーライトあるいは、セルロース粉末等であっても良い。
珪藻土を用いるときは、少なくとも３５０ｇ／ｍ２の１
次コート層を形成したのちに金属亜鉛粉末を含む２次コ
ート層を形成することが望ましく、また、２次コート層
中の金属亜鉛粉末の含有量を７５重量％以下とすること
が更に好ましい。In the method for purifying the electrolytic zinc plating bath of the present invention, diatomaceous earth is used as a filter aid, but other perlite or cellulose powder may be used.
When using diatomaceous earth, at least 350 g / m 2 of 1
It is desirable to form the secondary coat layer containing the metallic zinc powder after forming the next coat layer, and it is more preferable that the content of the metallic zinc powder in the secondary coat layer is 75% by weight or less.
【００１０】[0010]
【作用】本発明の電解亜鉛めっき浴の精製法によれば、
構造が簡単であって取扱が容易であることが知られてい
る回分式のタンク式濾過脱液機を用いて発熱を生ずるこ
となく濾滓の脱液を行うことができ、従って電解亜鉛め
っき浴を自動運転によって精製しながら安全に金属亜鉛
粉末含有濾滓ケーキを回収することができるようになっ
た。According to the method for purifying the electrolytic zinc plating bath of the present invention,
The batch-type tank-type filter dewatering machine, which is known to have a simple structure and is easy to handle, can be used to dewater the filter cake without causing heat generation, and therefore the electrolytic zinc plating bath can be used. It became possible to safely recover the filter cake containing the metal zinc powder while purifying it by automatic operation.
【００１１】[0011]
【実施例】図１に示すような濾過装置を利用して、酸化
亜鉛２０ｇ／ｌ、水酸化ナトリウム２００ｇ／ｌを含む
アルカリ性電解亜鉛めっき浴の精製試験を実施した。図
において、Ａは径３．８cm、長さ８５cm、濾過面積０．
１ｍ2 のポリプロピレン織布製円筒状濾材Ａ1 を３７本
垂設した上部集液式の回分式濾過機、Ｂは液給送ポン
プ、Ｃは濾過助材調整槽、Ｄは濾過面積０．２３ｍ2 の
ポリプロピレン織布製円形袋状濾材を内部に展張したタ
ンク式濾過脱液機であり、Ｅは回収濾液貯槽である。EXAMPLE A refining test of an alkaline electrolytic zinc plating bath containing 20 g / l of zinc oxide and 200 g / l of sodium hydroxide was carried out by using a filtration device as shown in FIG. In the figure, A is 3.8 cm in diameter, 85 cm in length, and has a filtration area of 0.
An upper collection type batch type filtration machine in which 37 cylindrical filter media A 1 of 1 m 2 are vertically suspended, B is a liquid feed pump, C is a filter aid adjusting tank, and D is a filtration area of 0.23 m. 2 is a tank type filter drainer in which the circular bag-shaped filter material made of polypropylene woven fabric of 2 is spread, and E is a recovery filtrate storage tank.
【００１２】（比較例）運転に先立って濾過助材調整槽
Ｃに濾過助材として珪藻土２．５kgと水１５０kgとを入
れて濾過助材分散液を調製し、この分散液を配管ｉ−ポ
ンプＢ−配管ｅ−原液室Ａ2 −濾材Ａ1 −集液室Ａ3 −
配管ｃ−配管ｂの順に循環させて、濾材Ａ1 の面に濾過
助材をプリコートした（プリコート助材量６７５ｇ／ｍ
2 ）。次いで調整槽Ｃに金属亜鉛粉末１．５kgを入れて
上記と同様にして濾材Ａ1 のプリコート層上に２次コー
トした（２次コート亜鉛量４０５ｇ／ｍ2 ）。(Comparative Example) Prior to the operation, 2.5 kg of diatomaceous earth as a filter aid and 150 kg of water were put in a filter aid adjusting tank C to prepare a filter aid dispersion liquid, and this dispersion liquid was used as a pipe i-pump. B- piping e- stock room A 2 - filter medium A 1 - collecting liquid chamber A 3 -
By circulating in the order of the pipe c and the pipe b, the surface of the filter medium A 1 was precoated with the filter aid (the amount of the precoat aid was 675 g / m 2).
2 ). Next, 1.5 kg of metallic zinc powder was placed in the adjusting tank C, and secondarily coated on the precoat layer of the filter medium A 1 in the same manner as described above (secondary coated zinc amount 405 g / m 2 ).
【００１３】このように準備した濾過機Ａに対して、劣
化亜鉛めっき液をポンプＢにより配管ｅを経て濾過機Ａ
の原液室Ａ2 に供給し、濾材Ａ1 で濾過して集液室Ａ3
−配管ｃ−配管ｆ−配管ｇを経て精製めっき液を回収し
た。こうしてめっき液の精製を終了したのち、加圧空気
を配管ａから配管ｃを経て集液室Ａ3 に供給し、バルブ
Ｆを急激に開放して原液室Ａ2 内のめっき液を配管ｄを
経て濾過脱液機Ｄに落とすと同時に、集液室Ａ3 内に残
っていた精製めっき液を逆流させて濾材Ａ1 上の珪藻土
や金属亜鉛粉末を剥離させ、これらの泥状物をすべて濾
過脱液機Ｄに流し出した。With respect to the thus-prepared filter A, the deteriorated zinc plating solution is pumped by pump B through pipe e to filter A.
To the stock solution chamber A 2 and filtered with the filter material A 1 to collect the solution in the collection chamber A 3.
The purified plating solution was recovered via-pipe c-pipe f-pipe g. After the purification of the plating solution is completed in this way, pressurized air is supplied from the pipe a to the liquid collection chamber A 3 through the pipe c, the valve F is rapidly opened, and the plating liquid in the stock solution chamber A 2 is fed through the pipe d. At the same time, the purified plating solution remaining in the collecting chamber A 3 is caused to flow backward to remove the diatomaceous earth and metallic zinc powder on the filter material A 1 and to filter all the mud-like substances. It was poured into the drainer D.
【００１４】こうして濾過機Ａの逆洗を終了したのちバ
ルブＦを閉じ、加圧空気を配管ａ−配管ｆ−配管ｈを経
て濾過脱液機Ｄに供給し、空気加圧により金属亜鉛粉末
を含む泥状物の脱液を行った。脱液終了後、濾過脱液機
Ｄの蓋を開けて内部の濾滓を取り出したところ、濾滓の
温度が２００℃を超えており、濾布が一部溶融してい
た。After the backwashing of the filter A is completed in this way, the valve F is closed, and pressurized air is supplied to the filter dewatering device D through the pipe a-pipe f-pipe h, and the metallic zinc powder is compressed by air pressure. The mud containing material was deliquored. After completion of the deliquoring, when the lid of the filter deliquoring machine D was opened and the filter residue inside was taken out, the temperature of the filter residue exceeded 200 ° C and the filter cloth was partially melted.
【００１５】（第１実施例） 運転に先立って、濾過助材として珪藻土１．４ｋｇを濾
材Ａ１の面にプリコートし（プリコート助材量３８０ｇ
／ｍ２）、次いで金属亜鉛粉末１．５ｋｇと珪藻土１．
１ｋｇとの混合物を濾材Ａ１の１次コート層上に２次コ
ートした（２次コート助材量３００ｇ／ｍ２、２次コー
ト亜鉛量４０５ｇ／ｍ２）。(First Example) Prior to the operation, 1.4 kg of diatomaceous earth as a filter aid was pre-coated on the surface of the filter medium A 1 (the amount of the pre-coat aid was 380 g).
/ M 2 ), then 1.5 kg of metallic zinc powder and diatomaceous earth 1.
The mixture with 1 kg was secondarily coated on the primary coating layer of the filter material A 1 (secondary coating auxiliary material amount 300 g / m 2 , secondary coating zinc amount 405 g / m 2 ).
【００１６】次いで比較例と全く同様な手順で劣化めっ
き液の精製を行い、更に濾材Ａ1 の逆洗と濾滓の脱液と
を行った。そして濾過脱液機Ｄの蓋を開けて内部の濾滓
を取り出したところ、濾滓の温度が僅かに温かい程度で
あったほか、濾過脱液機には何等の異常も見られなかっ
た。Then, the deteriorated plating solution was purified by the same procedure as in the comparative example, and the filter material A 1 was back-washed and the filter residue was drained. Then, when the lid of the filter dewatering machine D was opened and the filter cake inside was taken out, the temperature of the filter cake was slightly warm, and no abnormality was found in the filter dewatering machine.
【００１７】（第２実施例） 運転に先立って、濾過助材として珪藻土１．４ｋｇを濾
材Ａ１の面にプリコートし（プリコート助材量３８０ｇ
／ｍ２）、次いで金属亜鉛粉末１．５ｋｇを濾材Ａ１の
１次コート層上にコートし（２次コート亜鉛量４０５ｇ
／ｍ２）、更に珪藻土１．１ｋｇをその上に重ねてコー
トした（２次コート助材量３００ｇ／ｍ２）。(Second Example) Prior to the operation, 1.4 kg of diatomaceous earth as a filter aid was pre-coated on the surface of the filter medium A 1 (the amount of the pre-coat aid was 380 g).
/ M 2 ), and then 1.5 kg of metallic zinc powder of filter medium A 1
Coated on the primary coating layer (secondary coating zinc amount 405 g
/ M 2 ), and further 1.1 kg of diatomaceous earth was overlaid and coated (secondary coating auxiliary material amount 300 g / m 2 ).
【００１８】次いで比較例と全く同様な手順で劣化めっ
き液の精製を行い、更に濾材Ａ1 の逆洗と濾滓の脱液と
を行った。そして濾過脱液機Ｄの蓋を開けて内部の濾滓
を取り出したところ、第１実施例の場合と同様に何等の
異常も見られなかった。Then, the deteriorated plating solution was purified by the same procedure as in the comparative example, and the filter medium A 1 was back-washed and the filter residue was drained. Then, when the lid of the filter dewatering device D was opened and the filter cake inside was taken out, no abnormality was observed as in the case of the first embodiment.
【００１９】[0019]
【発明の効果】本発明の電解亜鉛めっき浴の精製法は、
金属亜鉛粉末を用いるめっき浴の化学的精製法において
亜鉛粉末の異常発熱を抑制することができるので、装置
に何等の損傷をも与えることがなく、自動運転によって
効率的な濾過処理が可能となり、また安全な濾過助材の
廃棄処理が可能となったので、環境汚染発生の恐れもな
く経済的に極めて有利である。The method for purifying the electrolytic zinc plating bath of the present invention is as follows:
Since it is possible to suppress abnormal heat generation of zinc powder in the chemical refining method of the plating bath using metal zinc powder, it is possible to perform efficient filtration processing by automatic operation without damaging the device. Further, since it becomes possible to safely dispose of the filter aid, there is no fear of environmental pollution, which is economically extremely advantageous.
【図１】本発明の電解亜鉛めっき浴の精製法を実施する
ための濾過精製装置の構成図である。FIG. 1 is a block diagram of a filtration and purification device for carrying out a method for purifying an electrolytic zinc plating bath of the present invention.
Ａ 上部集液式回分式濾過機 Ａ1 濾材 Ａ2 原液室 Ａ3 集液室 Ｂ めっき浴給送ポンプ Ｃ 濾過助材調整槽 Ｄ タンク式濾過脱液機 Ｅ 回収濾液貯槽 Ｆ バルブ ａ〜ｉ 配管A Upper collection type batch type filtration machine A 1 Filter material A 2 Stock solution chamber A 3 Collection room B Plating bath feeding pump C Filtration aid adjusting tank D Tank type filtration dewatering machine E Recovery filtrate storage tank F Valve a to i Piping
Claims (3)
た濾材を有する回分式濾過機を用いて電解亜鉛めっき浴
の濾遇精製を行なった後、該回分式濾過機を逆洗して該
濾材から脱離した金属亜鉛粉末を含む懸濁液をタンク式
濾過脱液機に直送し濾滓を分離回収するに当たり、あら
かじめ濾遇助材の分散液を順方向に通過させて１次コー
ト層を該濾材上に形成し、次いで金属亜鉛粉末と濾過助
材との混合分散液を順方向に通遇させるか又は金属亜鉛
粉末の分散液と濾過助材の分散液とを逐次に順方向に通
過させて金属亜鉛粉末と濾過助材とからなる２次コート
層を該１次コート層上に形成し、しかるのちに該めっき
浴の濾過精製を行なうことを特徴とする電解亜鉛めっき
浴の精製法。1. A precoat layer containing metallic zinc powder is provided.
And after performing濾遇purification of electrolytic galvanizing bath using a batch type filter device having a filter medium, said by backwashing the該回content type filter device
When the suspension containing the metallic zinc powder desorbed from the filter medium is directly sent to the tank type filter dewatering machine to separate and collect the filter residue, the dispersion liquid of the filter aid is passed in the forward direction in advance and the primary coating is applied.
A filter layer is formed on the filter medium , and then zinc metal powder and filter aid are added.
The mixed dispersion with wood is treated in the forward direction or metallic zinc
Pass the powder dispersion and the filter aid dispersion sequentially in the forward direction.
Secondary coat consisting of zinc metal powder and filter aid
A method for purifying an electrolytic zinc plating bath, which comprises forming a layer on the primary coating layer, and then filtering and purifying the plating bath.
も３５０ｇ／ｍ２の１次コート層を形成する請求項１記
載の電解亜鉛めっき浴の精製法。 2. The method for purifying an electrolytic zinc plating bath according to claim 1, wherein diatomaceous earth is used as a filter aid to form a primary coating layer of at least 350 g / m 2 .
を７５重量％以下とする請求項１又は２記載の電解亜鉛
めっき浴の精製法。3. The method for purifying an electrolytic zinc plating bath according to claim 1, wherein the content of the metallic zinc powder in the secondary coating layer is 75% by weight or less.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP99992A JPH0784679B2 (en) | 1992-01-07 | 1992-01-07 | Purification method of electrolytic zinc plating bath |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP99992A JPH0784679B2 (en) | 1992-01-07 | 1992-01-07 | Purification method of electrolytic zinc plating bath |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05179496A JPH05179496A (en) | 1993-07-20 |
| JPH0784679B2 true JPH0784679B2 (en) | 1995-09-13 |
Family
ID=11489291
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP99992A Expired - Fee Related JPH0784679B2 (en) | 1992-01-07 | 1992-01-07 | Purification method of electrolytic zinc plating bath |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0784679B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100665384B1 (en) * | 1998-11-30 | 2007-01-04 | 가부시키가이샤 에바라 세이사꾸쇼 | Plating machine |
| US9303329B2 (en) | 2013-11-11 | 2016-04-05 | Tel Nexx, Inc. | Electrochemical deposition apparatus with remote catholyte fluid management |
-
1992
- 1992-01-07 JP JP99992A patent/JPH0784679B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH05179496A (en) | 1993-07-20 |
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