JPS59133398A - Production of surface treated steel sheet for welded can having excellent rust preventiveness and paintability - Google Patents
Production of surface treated steel sheet for welded can having excellent rust preventiveness and paintabilityInfo
- Publication number
- JPS59133398A JPS59133398A JP766183A JP766183A JPS59133398A JP S59133398 A JPS59133398 A JP S59133398A JP 766183 A JP766183 A JP 766183A JP 766183 A JP766183 A JP 766183A JP S59133398 A JPS59133398 A JP S59133398A
- Authority
- JP
- Japan
- Prior art keywords
- tin
- steel sheet
- plating
- treatment
- chromate
- 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
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- Electroplating Methods And Accessories (AREA)
- Laminated Bodies (AREA)
- Electrochemical Coating By Surface Reaction (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は、シーム溶接Jこより後胴される食缶に適した
素材の製造方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a material suitable for a food can which is seam-welded.
従来、食缶、飲料缶を製造するぶりきの後胴は半田によ
って行われてきた。しかしながら、半田に含まれている
有害な鉛が内容物中に溶出する可能性があるために、近
年、半田による後胴は次第に行われなくなり、代ってシ
ーム溶接(スードロニツク溶接)による扱胴法が普及し
つつある。スードロニツク溶接法では、缶胴接合部の重
ね合わせ部分が0.3〜0.4 tm+の幅であるため
、鋼板の表面処理法によって接合の良否が大きく左右さ
れる。Traditionally, the rear bodies of tinplate used to manufacture food and beverage cans have been soldered. However, due to the possibility that the harmful lead contained in the solder may be leached into the contents, in recent years, soldering has gradually ceased to be used, and instead seam welding (Sudronik welding) has been replaced. is becoming popular. In the Sudronik welding method, since the overlapping portion of the can body joint has a width of 0.3 to 0.4 tm+, the quality of the joint is greatly influenced by the surface treatment method of the steel plate.
市販のぶりきで錫付着量の低いものほど溶接性が良くな
る傾向があり、また錫が高騰しているため、缶用材料の
需要家からは薄目付のぶりき、特に缶内面を塗装して使
用される場合には、現在市販品で最低の錫付着量(2,
6〜3−0り/−)の(1)わゆる#25ぶりきの偽以
下の付着量を有する材料が要求されている。Commercially available tinplates with a lower amount of tin coating tend to have better weldability, and as the price of tin has skyrocketed, consumers of can materials are looking for thinner tinplates, especially those with painted can interior surfaces. When used in
There is a need for a material having an adhesion weight of (1) less than that of so-called #25 tin of 6 to 3-0 mm/-).
ところで、このような薄目付のぶつきでは、ミルメーカ
ーで製造後、需要家で塗装、製缶がなされるまでの数ケ
月以上に亘る期間中に、錆が発生して缶用材料として使
用できな(なることがある。By the way, in the case of such a thin coating, rust occurs during the period of several months or more after production at the mill maker and before painting and can making at the customer, making it impossible to use it as a material for cans. (It may happen.
本発明者等は、特に薄目付ぶりきで発生する耐錆性不良
についてその原因を調べた。その結果、21/ぜ以下の
錫目付量のぶりきの場合、電気めっき後には鋼板表面1
に等しい厚みで形成されていた錫めっき層2が(第1A
図参照)、溶鍋処理時には溶融して鋼板1の四部に流れ
、溶鍋処理後の鋼板のFe −Sn合金層3表面では、
凸部は極めて薄い錫(合金)被葎しかなくなっている部
分4ができたり、極端な場合には表面が錫(合金)で覆
われずに裸出する部分5が発生しく第1B図参照)、そ
のために耐錆性が劣る結果となることを見出した。それ
に対して、#25ブリキ以上(Sn: 2.8 ? /
mF以上)の錫層N−xの在米のブリキでは、錫の量が
多いために溶鍋処理で表面が水平化されても鉄面が裸出
することはない(第1C図参照)。The present inventors particularly investigated the cause of poor rust resistance that occurs with light coating. As a result, in the case of tin plate with a tin weight of 21/z or less, after electroplating, the steel plate surface 1
The tin plating layer 2 which had been formed with a thickness equal to (1st A)
(see figure), melts and flows to the four parts of the steel plate 1 during the ladle treatment, and on the surface of the Fe-Sn alloy layer 3 of the steel plate after the ladle treatment,
The convex portion may have a portion 4 with only an extremely thin tin (alloy) covering, or in extreme cases, a portion 5 where the surface is not covered with tin (alloy) and is exposed (see Figure 1B). It was discovered that this resulted in poor rust resistance. On the other hand, #25 tin or higher (Sn: 2.8? /
In the case of American tinplate with a tin layer N-x (mF or more), the iron surface will not be exposed even if the surface is leveled by melting pot treatment because of the large amount of tin (see Figure 1C).
21/−以下の薄目付ぶりきの場合に、上記のような溶
鍋処理時に、錫が鋼板の四部に偏って極端に錫(合金)
層の薄い部分または鋼板面の裸出した部分が発生するの
を避けようとして、溶鍋処理を施さずにクロメート処理
を行うことも試みたが、その場合にもやはり耐錆性は劣
った。それは、錫は電着したままの状態では析出した錫
粒子の粒界も溶着しておらず、被覆層の緻密性が不十分
であり、鋼板面の被覆性も悪く、その上にクロメート処
理を行っても満足できるものはできないためである。In the case of a thin coating of 21/- or less, during the above-mentioned ladle treatment, tin is concentrated in the four parts of the steel plate and becomes extremely tin (alloy).
In an attempt to avoid thinner parts or exposed parts of the steel sheet surface, attempts were made to perform chromate treatment without hot pot treatment, but the rust resistance was still poor in that case. The reason for this is that when tin is electrodeposited, the grain boundaries of the precipitated tin particles are not welded, the coating layer is insufficiently dense, and the coverage of the steel plate surface is also poor. This is because even if you do, you will not be satisfied.
このように2 t / n?以下の薄目付ぶりきの場合
には、溶鍋処理をすると鋼板の凹凸のために錫、錫合金
層は厚みが不均一となる。一方、溶鍋処理をしないと錫
電着層中に多量に存在する空隙がそのまま残るために、
鋼板表面を均一に被怪して耐錆性を維持することは不可
能であった。Like this 2t/n? In the case of the following thin coatings, the thickness of the tin and tin alloy layer becomes non-uniform due to the unevenness of the steel plate when subjected to ladle treatment. On the other hand, if the molten pot treatment is not performed, the large amount of voids that exist in the tin electrodeposition layer will remain as they are.
It has been impossible to maintain rust resistance by uniformly coating the surface of a steel plate.
本発明者等は、以上のように薄目付ぶりきの耐錆性向上
を妨げている機構を究明した後、溶接性について検討を
行った。この結果によれば、シーム溶接の接合面には金
属錫量(鉄と合金化していない錫)がo、1t7−以上
存在することが必要であることが判明している。After the inventors investigated the mechanism that hinders the improvement of rust resistance of thin coating as described above, they investigated weldability. According to these results, it has been found that the amount of metallic tin (tin that is not alloyed with iron) must be present at the joint surface of the seam weld at 0,1t7- or more.
このような理由により、本発明者等は、耐錆性、シーム
溶接性の向上を図るために、溶鍋処理時に錫−鉄合金形
成を少なくし、かつ、均一で緻密な錫、錫−鉄合金層を
形成させる方法について鋭意研究を豆ない、鋼板に少量
のニッケルめっきを施した後、錫めっきを施し、さらに
クロメート皮膜を形成した後に溶鍋処理し、その後クロ
メート処理により水利酸化物を主体きするクロメート皮
膜を形成させることtこより、合金量が少なく、均一で
緻密な錫、錫−鉄合金層を有する表面処理鍋板を得るこ
とができ、表面のクロメート皮膜を適正範囲に制御する
ことにより、溶接性、耐錆性、塗装性に優れたシーム溶
接缶用表面処理鋼板を製造できた。得られた本発明の処
理鋼板を模式的に示すと第2図のようになる。第2図に
おいて、1は鋼板、2は錫層、3は錫−鉄合金層、6は
ニッケル層、7はクロメート層である。For these reasons, in order to improve rust resistance and seam weldability, the inventors of the present invention have attempted to reduce the formation of tin-iron alloy during ladle processing and create a uniform and dense tin, tin-iron alloy. We have carried out extensive research into methods of forming an alloy layer. After applying a small amount of nickel plating to a steel plate, tin plating is applied, and after forming a chromate film, it is treated in a melting pot, and then chromate treatment is used to mainly form water-conserving oxides. As a result, it is possible to obtain a surface-treated pan plate having a uniform and dense tin, tin-iron alloy layer with a small amount of alloy, and to control the chromate film on the surface within an appropriate range. As a result, we were able to manufacture a surface-treated steel sheet for seam-welded cans with excellent weldability, rust resistance, and paintability. The obtained treated steel sheet of the present invention is schematically shown in FIG. 2. In FIG. 2, 1 is a steel plate, 2 is a tin layer, 3 is a tin-iron alloy layer, 6 is a nickel layer, and 7 is a chromate layer.
本発明による方法に従って溶接缶用素材を製造する場合
に用いる鋼板は、造塊材あるいは連続鋳造材のいずれで
も良い。通常の方法で0.15〜0.33閣に冷間圧延
され、焼鈍後調質圧延された鋼板を原板とする。めっき
をするために通常の脱脂、酸洗を該原板に行い、Niめ
っきを施す。Niめっきは、通常使用されるワット浴あ
るいはスルファミン酸浴などを用いて行うことができる
。本発明に2けるNiめつきは錫めっきの均一電着およ
び溶鍋処理時のFe−8B合金形成の抑制を目的として
おり、ニッケル目付量は極微少で艮い。ニッケルめっき
を錫めっきの下地処理に用いる理由は次の通りである。The steel plate used in manufacturing the welded can material according to the method of the present invention may be either an ingot material or a continuous casting material. The original plate is a steel plate that is cold rolled to a thickness of 0.15 to 0.33 mm by a normal method, annealed, and then temper rolled. In order to perform plating, the original plate is subjected to normal degreasing and pickling, and then Ni plating is applied. Ni plating can be performed using a commonly used Watt bath or sulfamic acid bath. The Ni plating in the second aspect of the present invention is aimed at uniform electrodeposition of tin plating and suppression of Fe-8B alloy formation during ladle processing, and the nickel basis weight is extremely small. The reason why nickel plating is used as a base treatment for tin plating is as follows.
ぶつきは脱脂、酸洗後、錫めっき浴中で電解により鋼板
表面に錫を電着したものである。しかし、錫めっきは下
地の鋼板表面の影響を受は易く、脱脂、酸洗が完全に行
われていても、鋼板表面の極微少な表面性状の違いによ
り電着性が異なり、ピンホール等の多い錫めっき層とな
る。After degreasing and pickling, tin is electrodeposited on the steel plate surface by electrolysis in a tin plating bath. However, tin plating is easily affected by the surface of the underlying steel plate, and even if it is completely degreased and pickled, the electrodepositivity will vary due to minute differences in the surface texture of the steel plate surface, and there will be many pinholes etc. This becomes a tin plating layer.
本願では、鋼板を脱脂、酸洗後、ニッケルめっき浴中で
極薄ニッケルめっきを行い、引き続き錫めっきを行い、
均一な錫めっき層を形成させる。In this application, after degreasing and pickling the steel plate, ultra-thin nickel plating is performed in a nickel plating bath, followed by tin plating,
Form a uniform tin plating layer.
これは、銅板表面へのニッケルの電着性が鋼板表面の極
微少な活性の違いに左右されることが少なく、ニッケル
が均一に電着されるためである。このニッケル面に錫め
っきを行うと、ニッケル面が均一な活性面であるために
、錫の電着が均一に行われ、極薄錫めっき層でもピンホ
ールの少ないめっきが形成される。このために、次工程
でのクロメート処理後、溶◎処理時に均一な錫層の形成
ができる。また、鋼板と錫めっき層の間にニッケル層が
あるために、Fe −Sn合金の形成が抑制され、表層
に均一な金属錫層ができる。ニッケルは下地の鉄または
上層の錫と、溶鍋処理時の240〜400℃の温度では
硬くて脆いFe −Ni 、 Ni −Sn合金の形成
は全く起らず、加工性への影響はない。以上のような目
的を達成するために付着量は極微量で良く、20〜50
0η/ry?の範囲とする。ニッケル付N量が5007
Rf/n?より多いとニッケル層が0.05μ以上と厚
くなり、耐錆性向上には有利であるが、ニッケル層は比
較的硬いので加工性が悪くなる傾向がある。ニッケル付
着量が20mf//−未満では鋼板表面の被覆が不完全
であり、加工性は向上するが耐錆性が悪くなり、またニ
ッケルめっき上に錫めっき後、溶鍋処理時にFe −S
n合金形成の抑制効果がなくなり、本願の目的を達成で
きなくなる。This is because the electrodeposition of nickel onto the surface of the copper plate is less affected by minute differences in activity on the surface of the steel plate, and nickel is electrodeposited uniformly. When tin plating is performed on this nickel surface, since the nickel surface is a uniform active surface, tin is electrodeposited uniformly, and a plating with few pinholes is formed even in an extremely thin tin plating layer. For this reason, a uniform tin layer can be formed during the melting process after the chromate treatment in the next step. Furthermore, since there is a nickel layer between the steel plate and the tin plating layer, the formation of Fe-Sn alloy is suppressed, and a uniform metallic tin layer is formed on the surface layer. Nickel does not form any hard and brittle Fe--Ni, Ni--Sn alloys at temperatures of 240 to 400° C. during ladle treatment with the underlying iron or the upper layer of tin, and has no effect on workability. In order to achieve the above objectives, the amount of adhesion may be extremely small, 20 to 50
0η/ry? The range shall be . The amount of N with nickel is 5007
Rf/n? If the amount is larger, the nickel layer becomes thicker than 0.05μ, which is advantageous for improving rust resistance, but the nickel layer is relatively hard and tends to have poor workability. If the amount of nickel deposited is less than 20mf//-, the coating on the steel plate surface will be incomplete, and the workability will improve, but the rust resistance will deteriorate, and after tin plating on the nickel plating, Fe-S will be removed during the hot pot treatment.
The effect of suppressing n-alloy formation is lost, making it impossible to achieve the object of the present application.
錫めっきは、ハロゲン浴、フェロスタン浴あるいは硼弗
化物浴などの酸性めっき浴またはアルカリ錫めっき浴で
行って良い。本願の目的であるFe−Sn合金形成の抑
制により表層に均一な金属錫層を残し、溶接性、耐錆性
の向上を図るものであるが、錫付着量が2.0f/−よ
り多くなってもその効果が飽和してしまい、経済的にも
錫付着量を多くするとコストが高くなり、本願の目的か
らはずれてしまう。錫付着量が0.1f/i未満では被
覆が不完全で、その上層にクロメート皮膜を形成して溶
鍋処理を行っても、錫層は不均一の才まであり、かつ錫
量が少ないために、下地のニッケル層のFe −Sn合
金抑制効果も発揮できずに全ての鈴がFe −3n合金
となり、溶接性が悪くなる。このため、錫付着量は0.
1〜2.Or/m’の範囲とする。Tin plating may be carried out in an acid plating bath such as a halogen bath, a ferrostane bath or a borofluoride bath, or an alkaline tin plating bath. The purpose of this application is to suppress Fe-Sn alloy formation to leave a uniform metallic tin layer on the surface layer and improve weldability and rust resistance. However, the effect becomes saturated, and from an economic point of view, increasing the amount of tin deposited increases the cost, which deviates from the purpose of the present application. If the amount of tin deposited is less than 0.1 f/i, the coating is incomplete, and even if a chromate film is formed on the top layer and hot pot treatment is performed, the tin layer is uneven and the amount of tin is small. Furthermore, the effect of suppressing the Fe-Sn alloy of the underlying nickel layer cannot be exhibited, and all the bells become Fe-3n alloy, resulting in poor weldability. Therefore, the tin adhesion amount is 0.
1-2. The range is Or/m'.
弱めつき後、6価クロムを含有する水溶液中で3〜30
η/W?(クロム換算量)の水利酸化クロムを主体とす
るクロメート被罹を形成させた後、溶鍋処理を行う理由
は次の通りである。クロメート被膜量が30q/y/よ
り多くなると、溶鍋処理時に溶融した錫が鋼板表面を流
動して鋼板の凹部に移動する現象を阻止する1こめには
有利であるが、得られた製品の溶接性が悪くなる。クロ
メート被膜量が3り72未満では、溶鍋処理で溶融した
錫が鋼板表面を流動して鋼板の凹部に移動する現象を阻
止する効果がなくなるために、クロメート皮膜量は3〜
30T=f/靜にするのが良い。After weakening, 3-30% in an aqueous solution containing hexavalent chromium.
η/W? The reason for carrying out molten pot treatment after forming a chromate coating mainly composed of water-use chromium oxide (chromium equivalent amount) is as follows. If the amount of chromate coating is more than 30q/y/y, it is advantageous in preventing the phenomenon in which molten tin flows on the surface of the steel plate and moves into the recesses of the steel plate during ladle processing, but the resulting product Weldability deteriorates. If the amount of chromate film is less than 3 to 72, it will not be effective in preventing the phenomenon in which tin melted during ladle treatment flows on the surface of the steel plate and moves to the recesses of the steel plate.
It is better to set it to 30T=f/quiet.
また、溶鍋処理後のクロメート処理量は塗膜密着性の点
から重要である。クロメート皮膜量はクロム換算量で3
〜15η/rrlの範囲で行うのが良い。3り/rr?
未満では塗膜密着性が悪く、また耐錆性能の向上効果も
得られない。151W/y#を超えると塗膜密着性、耐
錆性は良好であるが、溶接時の均一なナゲツト形成がで
きず、「散り」の発生を生じるので、3〜15 T4/
m”とするのが艮い。In addition, the amount of chromate treated after the ladle treatment is important from the viewpoint of coating film adhesion. The amount of chromate film is 3 in terms of chromium equivalent amount.
It is preferable to perform this in the range of ~15η/rrl. 3ri/rr?
If it is less than that, the coating film adhesion will be poor and the effect of improving rust resistance will not be obtained. If it exceeds 151 W/y#, the coating film adhesion and rust resistance will be good, but uniform nugget formation during welding will not be possible and "splatter" will occur, so 3 to 15 T4/y
It is inappropriate to say "m".
次に、本発明の溶接缶用表面処理銀板の製造方法を実施
例および比較例につき具体的に説明する。Next, the method for manufacturing a surface-treated silver plate for welded cans according to the present invention will be specifically explained with reference to Examples and Comparative Examples.
〔実施例1〜12〕
冷延鋼板を常法の脱脂、酸洗処理を施した後、下記の条
件で本処理を行なった。本処理は、(1)ニッケルめっ
き、(2)錫めっき、(3)クロメート処理、(4)浴
錫処理、(5)クロメート処理、の順に行なった。[Examples 1 to 12] After performing conventional degreasing and pickling treatments on cold-rolled steel sheets, the main treatment was performed under the following conditions. This treatment was performed in the following order: (1) nickel plating, (2) tin plating, (3) chromate treatment, (4) bath tin treatment, and (5) chromate treatment.
(1)ニッケルめっき条件
ニッケルめっき浴(ワット浴)
硫酸ニッケル 2409/を
塩化ニッケル 401/l
ホウ酸 309/l
pH4,0
温度 45℃
電流密度 5 A/dm”
(2)錫めっき条件
錫めっき浴(ハロゲン浴)
塩化第1錫 609/を
酸性弗化ナトリウム 201/を
弗化ナトリウム 501/を
塩化ナトリウム 609/を
浴温 55℃
電流密度 30 h/lzi
(3) 、 (5) クロメート処理条件(溶鍋処理
前後)クロメート処理浴
重クロム酸ナトリウム 20?/を
無水クロム酸 30 グ/を
浴温 40℃
電流密度 5 A/dy?
(4)溶鍋処理
抵抗加熱方式で250℃まで急熱して錫層を溶融し、直
ちlこ水冷した。(1) Nickel plating conditions Nickel plating bath (Watt bath) Nickel sulfate 2409/Nickel chloride 401/L Boric acid 309/L pH 4.0 Temperature 45°C Current density 5 A/dm” (2) Tin plating conditions Tin plating bath (Halogen bath) Stannous chloride 609/Acidic sodium fluoride 201/Sodium fluoride 501/Sodium chloride 609/Bath temperature 55°C Current density 30 h/lzi (3), (5) Chromate treatment conditions ( (Before and after ladle treatment) Chromate treatment bath Sodium dichromate 20?/ chromic anhydride 30 g/ bath temperature 40℃ Current density 5 A/dy? The tin layer was melted and immediately cooled with water.
上記(1)〜(5)の工程で、ニッケルめっき量、錫め
っき量、溶鍋処理前後の水利クロム酸化膜量を表1に示
すよう変化させて処理し、得られた製品から試験片を切
り出して後述する特性調査に供した。In the above steps (1) to (5), the amount of nickel plating, the amount of tin plating, and the amount of chromium oxide film before and after the ladle treatment were changed as shown in Table 1, and test pieces were made from the obtained products. It was cut out and subjected to the characteristics investigation described later.
〔比較例1,3,5)
ニッケルめっき工程を省略した以外は実施例1と同じ処
理浴を用いて、錫めっき量、溶鍋処理前後のクロメート
皮膜量を表1に示すようζこ変化させて処理し、得られ
た製品力)ら試験片を切り出して以下の特性調査に供し
た。[Comparative Examples 1, 3, 5] The same treatment bath as in Example 1 was used except that the nickel plating step was omitted, and the amount of tin plating and the amount of chromate film before and after hot pot treatment were varied as shown in Table 1. A test piece was cut out from the resulting product and subjected to the following characteristic investigation.
〔比較例2. 4. 6. 7)
ニッケルめっき工程および溶鍋処理前後のクロメート処
理工程を省略した以外は実施例1と同じ処理浴を用いて
、錫めっきセtおよび溶鍋処理後のクロメート皮膜量を
表1に示すように変化させて処理し、得られた製品から
試験片を切り出して以下の特性調をに供した。[Comparative example 2. 4. 6. 7) Using the same treatment bath as in Example 1 except that the nickel plating step and the chromate treatment steps before and after the hot pot treatment were omitted, the amount of chromate film after the tin plating set and the hot pot treatment was as shown in Table 1. Test pieces were cut out from the resulting products and subjected to the following characteristic tests.
〔比較例8〕
現在一般に使われている#25ぶりき(Sn:2.8?
/ri)を特性試験に供した。[Comparative Example 8] #25 tin (Sn: 2.8?
/ri) was subjected to characteristic tests.
以上の実施例および比較例で得られた試験片につき、以
下に述べるようζこして特性試験を行った。The test pieces obtained in the above Examples and Comparative Examples were strained and subjected to characteristic tests as described below.
その結果を表1に示す。The results are shown in Table 1.
表1に示す試験結果から、本発明の表面処理鋼板は極薄
めつきでありながら、#25ぶりき(比較例8)と同等
の耐錆性、加工性、耐レトルト処理性を有し、溶接性、
塗膜密着性が#25ぶりきより優れていることが明らか
である。また、本発明の処理工程で、ニッケルめっき処
理才たは溶鍋処理前のクロメート処理を省略した表面処
理鋼板(比較例1〜7)より、明らかに本発明の鋼板が
優れ、両者の特性が相補的に作用していることが明らか
である。From the test results shown in Table 1, the surface-treated steel sheet of the present invention has rust resistance, workability, and retort resistance equivalent to that of #25 tin plate (Comparative Example 8), even though it has an extremely thin plating, and has welding resistance. sex,
It is clear that the coating adhesion is superior to #25 tin. In addition, the steel sheets of the present invention are clearly superior to the surface-treated steel sheets (Comparative Examples 1 to 7) in which nickel plating treatment or chromate treatment before hot pot treatment is omitted in the treatment process of the present invention, and the characteristics of both are superior. It is clear that they act in a complementary manner.
(1)耐錆性試験
試験片を、50℃、相対湿度98チ、30分→25℃、
相対湿度60%、30分の乾湿状態を繰り返し行う乾湿
繰り返し装置の槽内に入れて、72時間試験を行い、錆
の発生程度で評価した。(1) Rust resistance test specimen at 50°C, relative humidity 98°C, 30 minutes → 25°C.
The specimens were placed in a tank of a dry-wet cycle device that repeatedly underwent dry-wet conditions for 30 minutes at a relative humidity of 60%, and a test was conducted for 72 hours, and the degree of rust generation was evaluated.
評価はJIS Z 2912 r錆発生度測定法」に準
拠し、A(錆なし)〜E(全面錆)の5段階で行った。The evaluation was conducted in accordance with JIS Z 2912 r Rust Incidence Measurement Method in five stages from A (no rust) to E (full surface rust).
(2)加工性試験
3’ OX 50 tmnの試験片を直角に折り曲げ、
折り曲げ部を硫酸銅溶液に1分間浸漬した後、水洗乾燥
を行い、加工部を50倍の顕微鏡で観察し、めっき層の
亀裂に銅が析出した程度で評価した。(2) Workability test 3' OX 50 tmn test piece was bent at a right angle,
After the bent part was immersed in a copper sulfate solution for 1 minute, it was washed with water and dried, and the processed part was observed with a 50x microscope and evaluated based on the extent to which copper was deposited in the cracks in the plating layer.
評価は折り曲げ部中央の10囚幅内の亀裂の程度で次の
通り行った。Evaluation was performed as follows based on the degree of cracking within 10 widths at the center of the bent portion.
評価 ABODE
亀裂数 01〜34〜1011〜2021以上(3)
溶接性試験
165.5X80wnの試験片を用いて次の条件で行っ
た。Evaluation ABODE Number of cracks 01-34-1011-2021 or more (3)
Weldability test A test piece of 165.5×80wn was used under the following conditions.
溶接様ニス−ドロニック社製雑缶製造用機202径用
オーバーラツプ 0.4瓢
溶接速度 3 nz / gin溶接電流
1000〜4000A評価は、均一なナゲツト形成お
よび十分な溶接強度が得られる電流範囲で行った。Welding type Nis-Dronic miscellaneous can manufacturing machine 202 diameter overlap 0.4 gourd Welding speed 3 nz / gin Welding current
The 1000 to 4000 A evaluation was carried out within a current range that provided uniform nugget formation and sufficient welding strength.
○ △ ×
最適電流範囲 130八以上 90〜125A 85
A以下溶接部の強度は、溶接部をはさんだ円筒端部から
V字型の切り込みを入れ、三角部をプライヤーで握って
他端に向って引っ張るハインテストヲ行ない、途中で溶
接部が切断しないことを必要強度とした。○ △ × Optimal current range 1308 or more 90-125A 85
To check the strength of welds below A, perform a Heintest test in which a V-shaped cut is made from the end of the cylinder that sandwiches the weld, grip the triangular part with pliers, and pull it toward the other end to ensure that the weld does not break midway. The required strength was determined.
(4)塗膜−次密着性試験
エポキシフェノール系塗料を用いて塗布量が45±5■
/ 100 caとなるように塗装し、210℃で10
分間の焼付乾燥を行ったものにつき、ゴバン目テープ剥
離試験を行った。評価は、100個のゴバン目の剥離数
で行った。(4) Paint film-adhesion test Using epoxy phenol paint, the coating amount was 45 ± 5 ■
/ 100 ca, and 10 at 210℃.
After baking and drying for 1 minute, a strip tape peeling test was conducted. The evaluation was performed based on the number of peelings in 100 rows.
(5) レトルト処理試験
塗膜−次密着性試験と同様に塗装焼付乾燥した試験片に
クロスカットを入れ、3%食塩水中に浸漬して123℃
、60分間のレトルト処理を行い、水洗乾燥後、ブリス
ターの発生およびテープ剥離での塗膜密着性で評価した
。(5) Retort processing test Coating film--Similarly to the adhesion test, cross-cuts were made on the painted and dried test piece, and immersed in 3% saline solution at 123°C.
After rinsing with water and drying, evaluation was made on the occurrence of blisters and the adhesion of the coating film when peeled off with a tape.
◎・・・密着性良好、ブリスター発生なし○・・・密着
性やや不良、ブリスター発生なしΔ・・・密着性やや不
良、ブリスター数点発生X・・・密着性不良、ブリスタ
ー全面に発生◎...Good adhesion, no blisters ○...Slightly poor adhesion, no blisters Δ...Slightly poor adhesion, several blisters X...Poor adhesion, blisters all over the surface
第1A図および第1B図は薄目付の錫層を形成し、溶鍋
した時の状態を示す模式図、第1C図は溶鍋処理した#
25ぷりきの模式図、第2図は本発明lこよる表面処理
を施した状態の模式図である。
符号の説明
1・・・鋼板、2・・・錫めっき層、3・・・Fe −
Sn合金層、4・・・薄い錫被覆部、5−・・裸出部、
6・−・ニッケル層、7・・・クロメート層Figures 1A and 1B are schematic diagrams showing the state when a thin tin layer is formed and the metal is melted in a ladle.
FIG. 2 is a schematic diagram of 25 Priki in a state where the surface treatment according to the present invention has been applied. Explanation of symbols 1... Steel plate, 2... Tin plating layer, 3... Fe −
Sn alloy layer, 4--thin tin coated part, 5-- bare part,
6...Nickel layer, 7...Chromate layer
Claims (1)
ルめっきを施した後、0.1〜2.027Mの錫めっき
を施し、さらに6価クロムを含有する水溶液中でクロム
換算で3〜30■/−の水和酸化クロムを主体とするク
ロメート皮膜を形成した後、溶鍋処理し、その後クロメ
ート処理によりクロム換算で3〜15q/iの水和酸化
クロムを主体とするクロメート皮膜を形成−「ることを
特徴とする耐錆性、塗装性に優れた溶接缶用表面処理鋼
板の製造方法。After applying nickel plating of 20 to 500 x 7 d to a degreased and pickled cold-rolled steel sheet, tin plating of 0.1 to 2.027 M is applied, and further nickel plating of 0.1 to 2.027 M is applied to the degreased and pickled cold-rolled steel sheet, and further 3 to 5 d of tin plating is applied in an aqueous solution containing hexavalent chromium. After forming a chromate film mainly composed of hydrated chromium oxide of 30■/-, it is treated in a melting pot, and then chromate treatment forms a chromate film mainly composed of hydrated chromium oxide of 3 to 15q/i in terms of chromium. - A method for manufacturing a surface-treated steel sheet for welded cans with excellent rust resistance and paintability.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP766183A JPS59133398A (en) | 1983-01-20 | 1983-01-20 | Production of surface treated steel sheet for welded can having excellent rust preventiveness and paintability |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP766183A JPS59133398A (en) | 1983-01-20 | 1983-01-20 | Production of surface treated steel sheet for welded can having excellent rust preventiveness and paintability |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS59133398A true JPS59133398A (en) | 1984-07-31 |
Family
ID=11671991
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP766183A Pending JPS59133398A (en) | 1983-01-20 | 1983-01-20 | Production of surface treated steel sheet for welded can having excellent rust preventiveness and paintability |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS59133398A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS634091A (en) * | 1986-06-23 | 1988-01-09 | Kawasaki Steel Corp | Surface treated steel sheet for producing can |
JPH0331497A (en) * | 1989-06-29 | 1991-02-12 | Nippon Steel Corp | Production of thinly tin-plated steel sheet excellent in surface luster |
-
1983
- 1983-01-20 JP JP766183A patent/JPS59133398A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS634091A (en) * | 1986-06-23 | 1988-01-09 | Kawasaki Steel Corp | Surface treated steel sheet for producing can |
JPH0331497A (en) * | 1989-06-29 | 1991-02-12 | Nippon Steel Corp | Production of thinly tin-plated steel sheet excellent in surface luster |
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