JPH0718463A - Chemical conversion treatment - Google Patents
Chemical conversion treatmentInfo
- Publication number
- JPH0718463A JPH0718463A JP18660593A JP18660593A JPH0718463A JP H0718463 A JPH0718463 A JP H0718463A JP 18660593 A JP18660593 A JP 18660593A JP 18660593 A JP18660593 A JP 18660593A JP H0718463 A JPH0718463 A JP H0718463A
- Authority
- JP
- Japan
- Prior art keywords
- chemical conversion
- treated
- temperature
- treatment liquid
- conversion treatment
- 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.)
- Granted
Links
Landscapes
- Chemical Treatment Of Metals (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明は塗装工程若しくはメッキ
処理工程の前処理として、自動車ボデイその他の金属体
に化成処理被膜を形成するための化成処理方法に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chemical conversion treatment method for forming a chemical conversion treatment film on an automobile body or other metal body as a pretreatment for a coating process or a plating process.
【0002】[0002]
【従来の技術】従来より自動車ボデイ等の塗装工程にお
いては、自動車の下塗り塗装を行う電着塗装の前処理と
して塗装被膜の密着性と耐食性を向上させるために化成
処理被膜を形成する。この前処理方法は、先ず自動車ボ
デイをハンガーコンベア等を利用して脱脂工程に搬送し
てアルカリ脱脂剤やオルソ珪酸ソーダ等によって充分脱
脂した後、表面調整工程に搬送して、このボデイをチタ
ン塩とりん酸ナトリウム等の成分で作られたコロイド状
の液体中に浸漬けしてチタンコロイドを析出させ、更に
前記ボデイを化成処理工程に搬送してその表面にりん酸
処理被膜を形成するものである。2. Description of the Related Art Conventionally, in a coating process for an automobile body or the like, a chemical conversion treatment film is formed as a pretreatment for electrodeposition coating for undercoating an automobile in order to improve the adhesion and corrosion resistance of the coating film. In this pretreatment method, first, an automobile body is transported to a degreasing process by using a hanger conveyor or the like, sufficiently degreased with an alkaline degreasing agent or sodium orthosilicate, and then transported to a surface conditioning process, where the body is titanium salt. The titanium colloid is precipitated by immersing it in a colloidal liquid made of a component such as sodium phosphate and the like, and then the body is conveyed to a chemical conversion treatment step to form a phosphoric acid treatment film on its surface. .
【0003】[0003]
【発明が解決しようとする課題】しかしながらこのりん
酸処理被膜は、鋼板表面の溶解性を利用して形成される
ものであるために、鋼板の表面性状が被膜形成に大きく
影響する。即ち自動車ボデイにおいては、平面部分の化
成反応性はよいが、凹凸を有する板合わせ部分の反応性
は悪く、この為従来は板合わせ部分に合せて反応温度及
び反応時間を設定して化成処理を行っている為に、平面
部分に過剰な化成被膜が付き、処理液の無用な消費のみ
ならず、その後の塗装工程において塗料の使用量が増加
する等塗装工程に悪影響を及ぼす場合がある。However, since this phosphoric acid-treated coating is formed by utilizing the solubility of the steel sheet surface, the surface properties of the steel sheet have a great influence on the coating formation. That is, in an automobile body, the chemical conversion reactivity of the flat part is good, but the reactivity of the plate-bonding part having irregularities is poor. Therefore, conventionally, the chemical conversion treatment is performed by setting the reaction temperature and reaction time according to the plate-bonding part. Since it is carried out, an excessive chemical conversion film is attached to the flat surface portion, which may not only unnecessarily consume the treatment liquid but also adversely affect the coating process such as an increase in the amount of the coating used in the subsequent coating process.
【0004】又近年軽量化を図るために、又ルーフ部に
窓を設ける為に、鋼板のボデイの一部にアルミ材を含ん
だコンポジット構造の車体が提案されているが、かかる
車体の場合アルミ材が化成処理液に対し鋼板より反応性
が低いために、NaF(フッ化ナトリウム)等の添加剤
を処理液に添加し、アルミ材部分の反応性を上げている
が、かかる処理方法ではアルミ材形成部位以外の鋼板部
位の反応性も上がり、結果としてその部位に過剰な化成
被膜が付き、やはり前記と同様な欠点が派生する。In recent years, in order to reduce the weight and to provide a window in the roof part, a vehicle body having a composite structure in which an aluminum material is included in a part of a body of a steel sheet has been proposed. Since the material has a lower reactivity to the chemical conversion treatment liquid than the steel plate, an additive such as NaF (sodium fluoride) is added to the treatment liquid to increase the reactivity of the aluminum material portion. The reactivity of the steel plate portion other than the material forming portion is also increased, and as a result, an excessive chemical conversion film is attached to that portion, and the same drawbacks as described above are derived.
【0005】本発明はかかる従来技術の欠点に鑑み、被
処理体に反応性のよい部位と反応性の悪い部位が存在す
る場合でも被処理体の各部位に於ける化成被膜の膜厚の
均一化、言い換えれば単位当りの化成被膜重量のバラツ
キの低減化を図ることの出来る化成処理方法を提供する
ことを目的とする。In view of the above-mentioned drawbacks of the prior art, the present invention makes the film thickness of the chemical conversion film uniform at each part of the object to be processed even when the object has a highly reactive part and a poorly reactive part. In other words, it is an object of the present invention to provide a chemical conversion treatment method capable of reducing variation in the weight of the chemical conversion coating per unit.
【0006】[0006]
【課題を解決する為の手段】図3は、りん酸化成処理液
の温度を変化しながら、自動車ボデイ用鋼板(材質SP
CC及びSGACC)をりん酸化成処理液中に所定時間
浸漬けして得られる被膜重量と温度との関係を示すもの
であり、本図より明らかなように温度の上昇にしたがっ
て被膜重量が上昇することが理解され、特に45℃まで
はその上昇カーブが小さいが、45℃を越えるとその上
昇カーブが大きくなる事が理解される。FIG. 3 shows a steel plate for an automobile body (material SP
(CC and SGACC) is a relationship between the coating weight and temperature obtained by immersing (CC and SGACC) in a phosphoric acid conversion treatment solution for a predetermined time. As is clear from this figure, the coating weight increases with increasing temperature. It is understood that the rising curve is small up to 45 ° C, but the rising curve becomes large above 45 ° C.
【0007】本発明はかかる知見に基づいて創作された
ものであり、その特徴とするところは、被処理体を処理
液槽内に浸漬けして、被処理体の表面に化成処理被膜を
形成させる化成処理方法において、前記被処理体の化成
処理液と反応性のよい部位と反応性の悪い部位のいずれ
か一方の所定部位に対面可能に、冷熱体若しく温熱体を
配置し、該熱体よりの放熱を利用して所定部位近傍の処
理液温度を、他の部位の処理液温度に比較して相対的に
温度差をもたせ、前記被処理体の各部位に於ける化成被
膜重量のバラツキの低減化を図った事にある。この場合
被処理体が自動車ボデイである場合においては、反応性
のよい部位周辺の処理液温度を略45℃以下に、反応性
の悪い部位周辺の処理液温度を略45℃以上になるよう
に相対的に温度差をもたせるのがよい。The present invention was created on the basis of such findings, and is characterized in that the article to be treated is immersed in the treatment liquid tank to form a chemical conversion coating on the surface of the article to be treated. In the chemical conversion treatment method, a cold or hot body is disposed so that the cold body or the hot body can be faced to a predetermined site on either one of the site having good reactivity and the site having poor reactivity with the chemical conversion solution of the object to be treated, The temperature of the treatment liquid in the vicinity of a predetermined portion is relatively different from that of the other portions by utilizing the heat radiation from the heat treatment, so that the weight of the chemical conversion coating varies among the respective portions of the object to be treated. It is intended to reduce. In this case, when the object to be treated is an automobile body, the temperature of the treatment liquid around the highly reactive portion should be about 45 ° C or lower, and the temperature of the treatment liquid around the poorly reactive portion should be about 45 ° C or higher. It is better to have a relative temperature difference.
【0008】[0008]
【実施例】以下、図面に基づいて本発明の実施例を例示
的に詳しく説明する。但しこの実施例に記載されている
構成部品の寸法、材質、形状、その相対配置などは特に
特定的な記載がない限りは、この発明の範囲をそれのみ
に限定する趣旨ではなく単なる説明例に過ぎない。図1
(A)は本発明の第1実施例にかかる自動車ボデイ塗装
の前処理工程に使用する化成処理液槽を示し、、処理液
1aが収納されている処理液槽1の上方に被処理体2を
処理液槽1内に入槽及び出槽を行いながら搬送するコン
ベア3が架設されていると共に、このコンベア3には被
処理体2を支持して処理液槽1内の処理液1a中に搬送
する物品支持治具5が間隔を有して複数個配設されてい
る。又、図1(B)に示すように、処理液循環の為に適
宜箇所を開口させた管路6が長手方向に沿って配設され
ており、該管路6はポンプ8及び熱交換器9と接続され
ており、これにより処理液槽1の処理液1aが熱交換器
9により常に一定温度に維持されながら管路6を介して
処理液槽1内を循環する構成となっている。Embodiments of the present invention will now be illustratively described in detail with reference to the drawings. However, the dimensions, materials, shapes, relative positions and the like of the components described in this embodiment are not intended to limit the scope of the present invention thereto, but are merely examples, unless otherwise specified. Not too much. Figure 1
(A) shows a chemical conversion treatment liquid tank used in a pretreatment process for automobile body painting according to the first embodiment of the present invention, in which an object to be treated 2 is provided above the treatment liquid tank 1 in which a treatment liquid 1a is stored. A conveyer 3 is installed to carry the material into and out of the treatment liquid tank 1 while supporting the object 2 to be treated in the treatment liquid 1a in the treatment liquid tank 1. A plurality of article support jigs 5 to be conveyed are arranged at intervals. Further, as shown in FIG. 1 (B), a pipe line 6 which is opened at an appropriate position for circulating the treatment liquid is arranged along the longitudinal direction, and the pipe line 6 includes a pump 8 and a heat exchanger. 9 is connected to the processing liquid tank 1 so that the processing liquid 1a in the processing liquid tank 1 is circulated in the processing liquid tank 1 via the pipe line 6 while being constantly maintained at a constant temperature by the heat exchanger 9.
【0009】そして前記管路6の僅かに上方の自動車ボ
デイ2の板合わせ部位2aと対面する側に、処理液槽1
長手方向に沿って平行に2本の流体管12を配設し、該
流体管12に熱交換器11により所定温度に加温した流
体がポンプ15を介して循環するように構成する。そし
て前記熱交換器11にはヒートポンプその他の加温機2
0により加温された熱媒が該交換器11内の熱交換パイ
プを循環可能に構成すると共に、流体管12近傍に設け
たサーミスタ21よりの検知温度に基づいて前記加温機
20をコントローラ29を介して制御し精度よく流体管
12に流れる流体温度を制御可能に構成する。The treatment liquid tank 1 is located slightly above the pipe line 6 on the side facing the plate matching portion 2a of the automobile body 2.
Two fluid pipes 12 are arranged in parallel along the longitudinal direction, and a fluid heated to a predetermined temperature by the heat exchanger 11 is circulated in the fluid pipes 12 via a pump 15. The heat exchanger 11 has a heat pump 2 and other warmers 2.
The heat medium heated by 0 makes it possible to circulate through the heat exchange pipe in the exchanger 11, and the controller 29 controls the heater 20 based on the temperature detected by the thermistor 21 provided near the fluid pipe 12. The temperature of the fluid flowing through the fluid pipe 12 can be controlled accurately by controlling the temperature of the fluid pipe 12.
【0010】かかる構成において、例えばりん酸塩化成
処理液中に酸化マンガンと酸化ニッケル等を夫々所定重
量%含有させた公知の化成処理液を用い、前記処理液槽
1内の処理液温度を40〜43℃に設定し、SPCC材
質の鋼板を用いた自動車ボデイを前記流体管12より処
理液を加温させない従来の状態で、先に示した前処理工
程手順で化成処理を行ったところ、各部位における化成
被膜重量が、2.05〜2.56(g/m2)とバラツ
キが有った。次に前記流体管12より50℃前後に高め
た熱媒を循環させ、板合せ部位2a側周辺の処理液温度
を高めた状態で、前記と同一条件で化成処理を行ったと
ころ、各部位における化成被膜重量が、2.30〜2.
56(g/m2)と前記バラツキが大幅に減少した。In such a structure, for example, a known chemical conversion treatment liquid containing manganese oxide, nickel oxide and the like in a predetermined amount in a phosphate conversion treatment liquid is used, and the treatment liquid temperature in the treatment liquid tank 1 is set to 40. The temperature was set to ˜43 ° C., and the car body using the steel plate of SPCC material was subjected to the chemical conversion treatment by the above-described pretreatment process procedure in the conventional state in which the treatment liquid was not heated from the fluid pipe 12. The weight of the chemical conversion coating on the site varied with 2.05 to 2.56 (g / m 2 ). Next, when a heat medium heated to about 50 ° C. was circulated from the fluid pipe 12 to raise the temperature of the treatment liquid around the plate-matching portion 2a, the chemical conversion treatment was performed under the same conditions as described above. The conversion coating weight is 2.30-2.
The variation was 56 (g / m 2 ), which was significantly reduced.
【0011】次にSGACの鋼板を用いた自動車ボデイ
1を前記流体管12より処理液を加温させない状態と加
温させた状態で、前記と同一条件で化成処理を行ったと
ころ、前者においては各部位における化成被膜重量が、
3.11〜3.51(g/m2)であったのに際し、後
者においては各部位における化成被膜重量が、3.31
〜3.56(g/m2)と前記バラツキが大幅に減少し
た。Next, the car body 1 made of SGAC steel plate was subjected to chemical conversion treatment under the same conditions as above, with and without heating of the treatment liquid from the fluid pipe 12, and in the former case, The weight of the chemical conversion coating at each site is
Although it was 3.11 to 3.51 (g / m 2 ), in the latter case, the weight of the conversion coating film at each site was 3.31.
-3.56 (g / m < 2 >), the variation was significantly reduced.
【0012】図3は前記と逆にドア周辺の処理液温度を
低めた他の実施例で、(A)に示すように、処理液貯溜
部内の自動車ボデイ2のドア部位2bと対面する位置
に、冷却用流体管13を櫛歯状に配設し、該流体管13
に熱交換器11により所定温度に冷却した流体がポンプ
24を介して循環するように構成する。そして前記熱交
換器11にはヒートポンプその他の冷却機25と接続さ
れ、前記流体管とドア部位2bの間に設けたサーミスタ
21よりの検知温度に基づいて前記冷却機25を制御し
前記流体管13を介して自動車ボデイ2のドア部位2b
周辺の温度を他の部位に対し温度差をもたすように精度
よく制御可能に構成する。FIG. 3 shows another embodiment in which the temperature of the treatment liquid around the door is lowered contrary to the above, and as shown in FIG. 3A, the treatment liquid storage portion is located at a position facing the door portion 2b of the automobile body 2. , The cooling fluid pipes 13 are arranged in a comb shape, and the fluid pipes 13
In addition, the fluid cooled to a predetermined temperature by the heat exchanger 11 is circulated through the pump 24. The heat exchanger 11 is connected to a heat pump or other cooler 25, and the cooler 25 is controlled based on the temperature detected by the thermistor 21 provided between the fluid pipe and the door portion 2b to control the fluid pipe 13. Through the door portion 2b of the automobile body 2
The surrounding temperature is configured to be accurately controlled so as to have a temperature difference with respect to other parts.
【0013】かかる構成において、前記処理液槽1内の
処理液温度を46〜50℃前後に設定し、前記流体管1
2内に37〜40℃前後の低い冷媒を循環させ、平面状
の処理液の反応性のよいドア部位2a側周辺の処理液温
度を低下させた状態で、SPCC材質の鋼板を用いた自
動車ボデイと、SGAC材質の鋼板を用いた自動車ボデ
イ夫々について、前記と同一条件で化成処理を行ったと
ころ、前記実施例と同様に各部位における化成被膜重量
のバラツキが大幅に減少した。In this structure, the temperature of the processing liquid in the processing liquid tank 1 is set to around 46 to 50 ° C.
In the state in which a low coolant temperature of about 37 to 40 ° C. is circulated in 2 to reduce the temperature of the processing solution around the door portion 2a side where the planar processing solution has good reactivity, an automobile body made of a steel plate of SPCC material is used. When each of the automobile bodies using the steel sheet of SGAC material was subjected to the chemical conversion treatment under the same conditions as described above, the variation in the weight of the chemical conversion coating in each part was significantly reduced as in the above-mentioned example.
【0014】[0014]
【効果】以上記載した如く本発明によれば、処理液槽内
の処理液の温度を部分的に温度差をもたせて制御する事
により、被処理体の平面部位と凹凸部位、更にはアルミ
材と鋼板の様に材質の異なる部位を有するコンポジット
構造の被処理体の様に、処理液の反応しやすい部位と、
反応し難い部位が存在する場合でも被処理体の各部位に
於ける化成被膜重量のバラツキの低減を図ることの出来
る。又本発明は塗装工程のみならずメッキ処理工程の化
成処理方法としても適用可能である。等の種々の著効を
有す。As described above, according to the present invention, the temperature of the processing liquid in the processing liquid tank is controlled by partially giving a temperature difference, and thus the flat surface portion and the uneven portion of the object to be processed, and further the aluminum material. And a portion where the treatment liquid easily reacts, such as a composite-structured object having portions with different materials such as a steel plate,
Even if there is a site that is difficult to react, it is possible to reduce the variation in the weight of the chemical conversion coating in each site of the object to be treated. Further, the present invention can be applied not only as a coating process but also as a chemical conversion treatment method for a plating process. It has various remarkable effects.
【図1】本発明の第1の実施例にかかる自動車ボデイ塗
装前処理用の化成処理液槽を示す概略図で、(A)はそ
の正面図、(B)はその中央断面図である。FIG. 1 is a schematic view showing a chemical conversion treatment bath for automobile body pre-coating treatment according to a first embodiment of the present invention, (A) is a front view thereof, and (B) is a central sectional view thereof.
【図2】本発明の他の実施例にかかる自動車ボデイ塗装
前処理用の化成処理液槽を示す概略図で、(A)はその
正面図、(B)はその中央断面図である。FIG. 2 is a schematic view showing a chemical conversion treatment bath for automobile body pre-treatment according to another embodiment of the present invention, in which (A) is a front view thereof and (B) is a central sectional view thereof.
【図3】化成処理における被膜重量と温度の関係を示す
グラフ図である。FIG. 3 is a graph showing the relationship between coating weight and temperature in chemical conversion treatment.
5 物品支持具 2 被処理体 1 処理液槽 11 熱交換器 12 温熱体 13 冷熱体 5 article support 2 object to be treated 1 treatment liquid tank 11 heat exchanger 12 hot body 13 cold body
Claims (2)
処理体の表面に化成処理被膜を形成させる化成処理方法
において、 前記被処理体の化成処理液と反応性のよい部位と反応性
の悪い部位のいずれか一方の所定部位に対面可能に、冷
熱体若しく温熱体を配置し、該熱体よりの放熱を利用し
て所定部位近傍の処理液温度を、他の部位の処理液温度
に比較して相対的に温度差をもたせることにより、前記
被処理体の各部位に於ける単位当りの化成被膜重量のバ
ラツキの低減化を図った事を特徴とする化成処理方法1. A chemical conversion treatment method of forming a chemical conversion treatment film on the surface of an object to be treated by immersing the object to be treated in a treatment liquid tank, wherein a portion of the object to be treated that has a high reactivity with the chemical conversion solution. A cold or hot body is placed so as to be able to face any one of the predetermined areas with poor reactivity, and the heat of the heat body is used to dissipate the temperature of the treatment liquid in the vicinity of the predetermined area. A chemical conversion treatment method characterized in that a variation in the weight of the chemical conversion coating per unit in each part of the object to be treated is reduced by making a relative temperature difference compared with the temperature of the treatment liquid.
いて、反応性のよい部位周辺の処理液温度を略45℃以
下に、反応性の悪い部位周辺の処理液温度を略45℃以
上になるように相対的に温度差をもたせたことを特徴と
する請求項1記載の化成処理方法2. When the object to be treated is an automobile body, the temperature of the treatment liquid around the highly reactive portion is about 45 ° C. or less, and the temperature of the treatment liquid around the poorly reactive portion is about 45 ° C. or more. The chemical conversion treatment method according to claim 1, wherein a relative temperature difference is provided.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP18660593A JP2782655B2 (en) | 1993-06-30 | 1993-06-30 | Chemical treatment method |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP18660593A JP2782655B2 (en) | 1993-06-30 | 1993-06-30 | Chemical treatment method |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH0718463A true JPH0718463A (en) | 1995-01-20 |
JP2782655B2 JP2782655B2 (en) | 1998-08-06 |
Family
ID=16191498
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP18660593A Expired - Fee Related JP2782655B2 (en) | 1993-06-30 | 1993-06-30 | Chemical treatment method |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2782655B2 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6334782B1 (en) | 1998-01-29 | 2002-01-01 | Smk Corporation | Printed-circuit board |
US10513784B2 (en) | 2014-04-30 | 2019-12-24 | Rio Verwaltungs Ag | Treatment device and treatment method for pickling and phosphating metal parts |
-
1993
- 1993-06-30 JP JP18660593A patent/JP2782655B2/en not_active Expired - Fee Related
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
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US6334782B1 (en) | 1998-01-29 | 2002-01-01 | Smk Corporation | Printed-circuit board |
US10513784B2 (en) | 2014-04-30 | 2019-12-24 | Rio Verwaltungs Ag | Treatment device and treatment method for pickling and phosphating metal parts |
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JP2782655B2 (en) | 1998-08-06 |
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