JPH03223490A - Production of steel sheet electroplated with zn alloy excellent in chemical conversion treating property - Google Patents
Production of steel sheet electroplated with zn alloy excellent in chemical conversion treating propertyInfo
- Publication number
- JPH03223490A JPH03223490A JP1616690A JP1616690A JPH03223490A JP H03223490 A JPH03223490 A JP H03223490A JP 1616690 A JP1616690 A JP 1616690A JP 1616690 A JP1616690 A JP 1616690A JP H03223490 A JPH03223490 A JP H03223490A
- Authority
- JP
- Japan
- Prior art keywords
- plating
- chemical conversion
- plating bath
- bath
- steel sheet
- 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 15
- 239000010959 steel Substances 0.000 title claims abstract description 15
- 238000004519 manufacturing process Methods 0.000 title claims description 8
- 239000000126 substance Substances 0.000 title abstract description 29
- 238000006243 chemical reaction Methods 0.000 title abstract description 26
- 229910001297 Zn alloy Inorganic materials 0.000 title abstract 3
- 238000007747 plating Methods 0.000 claims abstract description 78
- 239000011248 coating agent Substances 0.000 claims abstract description 16
- 238000000576 coating method Methods 0.000 claims abstract description 16
- 238000009713 electroplating Methods 0.000 claims abstract description 14
- 238000000034 method Methods 0.000 claims abstract description 12
- 239000000203 mixture Substances 0.000 claims abstract description 12
- 238000007654 immersion Methods 0.000 claims abstract description 10
- 239000000956 alloy Substances 0.000 claims description 20
- 229910045601 alloy Inorganic materials 0.000 claims description 20
- 239000011701 zinc Substances 0.000 description 17
- 239000010410 layer Substances 0.000 description 10
- 239000013078 crystal Substances 0.000 description 7
- 239000003973 paint Substances 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 229910019142 PO4 Inorganic materials 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 4
- 238000011156 evaluation Methods 0.000 description 4
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 4
- 239000010452 phosphate Substances 0.000 description 4
- 239000002344 surface layer Substances 0.000 description 4
- UGZADUVQMDAIAO-UHFFFAOYSA-L zinc hydroxide Chemical compound [OH-].[OH-].[Zn+2] UGZADUVQMDAIAO-UHFFFAOYSA-L 0.000 description 4
- 229940007718 zinc hydroxide Drugs 0.000 description 4
- 229910021511 zinc hydroxide Inorganic materials 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 229910007567 Zn-Ni Inorganic materials 0.000 description 3
- 229910007614 Zn—Ni Inorganic materials 0.000 description 3
- 239000010960 cold rolled steel Substances 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000011109 contamination Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229920000298 Cellophane Polymers 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 229910007570 Zn-Al Inorganic materials 0.000 description 1
- 229910052787 antimony Inorganic materials 0.000 description 1
- 239000010953 base metal Substances 0.000 description 1
- 229910052797 bismuth Inorganic materials 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 229910052793 cadmium Inorganic materials 0.000 description 1
- 125000002091 cationic group Chemical group 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000004070 electrodeposition Methods 0.000 description 1
- 229910052738 indium Inorganic materials 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 229910052741 iridium Inorganic materials 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 229910052745 lead Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000004626 scanning electron microscopy Methods 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- SPDJAIKMJHJYAV-UHFFFAOYSA-H trizinc;diphosphate;tetrahydrate Chemical compound O.O.O.O.[Zn+2].[Zn+2].[Zn+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O SPDJAIKMJHJYAV-UHFFFAOYSA-H 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 239000011787 zinc oxide Substances 0.000 description 1
Landscapes
- Chemically Coating (AREA)
- 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、Ｚｎ系合金電気めっき鋼板の製造方法に係り
、特にめっき面の化成処理性の改善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 producing a Zn-based alloy electroplated steel sheet, and particularly to improving the chemical conversion treatment property of a plated surface.
〈従来の技術〉
Ｚｎ系電気めっき鋼板は、素材の材質を劣化させること
なく、高耐食性が実現できるため、自動車、家電、建材
等従来冷延鋼板が使用されていた輻広い分野に用途が拡
大されつつある。<Conventional technology> Zn-based electroplated steel sheets can achieve high corrosion resistance without deteriorating the material quality, so their use is expanding to a wide range of fields where cold-rolled steel sheets have traditionally been used, such as automobiles, home appliances, and building materials. It is being done.
特に近年、耐食性向上を目的としてＺｎ−Ｎｉ、Ｚｎ−
ＦｅなどのＺｎ系合金電気めっき鋼板が開発され、自動
車車体の防錆用めっき鋼板等に適用され、その生産が著
しく増加している。In particular, in recent years, Zn-Ni, Zn-
Electroplated steel sheets made of Zn-based alloys such as Fe have been developed and are being applied to rust-preventing plated steel sheets for automobile bodies, and their production is increasing significantly.
ところで、Ｚｎ系合金電気めっき鋼板上に、リン酸塩化
成処理時に生成するリン酸塩結晶はｈｏｐｅｉｔｅ （
Ｚｆｌｓ（ＰＯｎ）ｚ Ｈ４ＨｘＯ）で、このｈｏｐｅ
ｉ ｔｅは冷延鋼板上に生成するｐｈｏｓｐｈｏｐｈｙ
ｌｌｉｔｅ （ＺｎＪｅ（ｐｏａ）ｘ・４１１１Ｇ）に
比較して塗料の密着性が劣るために、その使用部位は車
体内面が主体で、車体外側に用いることには問題があっ
た。By the way, phosphate crystals generated on Zn-based alloy electroplated steel sheets during phosphate chemical conversion treatment are called hopeite (
Zfls(POn)z H4HxO), this hope
i te is phosphophy generated on cold rolled steel plate.
Since the adhesion of the paint is inferior to that of llite (ZnJe(poa)
さらにＺｎ系合金電気めっき鋼板は、そのめっき表層に
不均一な不動態被膜を形成しやすく、以後のリン酸塩に
よる化成処理において、その被膜形成にむらが生じやす
く、また、このむらが、後に施される塗装にも影響し塗
装後の外観むらとなり、外観上製品価値を著しく阻害す
ることがある。特に自動車の耐久性向上から自動車の外
面にもＺｎ系合金電気めっき鋼板が採用されつつあり、
前記むらも塗料の密着性に併せて障害になっている。Furthermore, Zn-based alloy electroplated steel sheets tend to form a non-uniform passive film on the surface of the plating, and in the subsequent chemical conversion treatment with phosphate, the film formation is likely to be uneven, and this unevenness may be caused later. It also affects the applied coating, resulting in uneven appearance after coating, which can significantly impair the product's appearance. In particular, Zn-based alloy electroplated steel sheets are being adopted for the exterior of automobiles to improve their durability.
The above-mentioned unevenness also poses a problem as well as the adhesion of the paint.
これらの問題点に対し、従来、特開昭５６−１３３４８
８号公報、特公昭６０−５７５１８号公報に示されてい
る２層めっきによる方法が用いられている。この技術は
Ｚｎ系めっきの上にＦｅリッチなめっきを施し、耐食性
は下層で、化成処理性は上層でと、役割りを分担するこ
とによりＺｎ系合金めっきの化成処理性、塗装性の改善
を行っている。To address these problems, conventionally,
The two-layer plating method disclosed in Japanese Patent Publication No. 8 and Japanese Patent Publication No. 60-57518 is used. This technology improves the chemical conversion treatability and paintability of Zn-based alloy plating by applying Fe-rich plating on top of Zn-based plating, and dividing the roles by providing corrosion resistance in the lower layer and chemical conversion treatment in the upper layer. Is going.
しかしながら、上記技術においては、以下のような欠点
がある。However, the above technology has the following drawbacks.
（！）上層めっきによりコストアップになる。(!) Upper layer plating increases costs.
（２）上層めっきの目付量が少ないので、上層めっきの
コントロールがＭＬい。(2) Since the basis weight of the upper layer plating is small, control of the upper layer plating is difficult.
（３）卑な金属の上に責な金属をめっきするため、上層
めっき量が増加すると下層金属の溶解量が増加して耐食
性が悪くなる。(3) Since a harmful metal is plated on a base metal, as the amount of upper layer plating increases, the amount of dissolved lower layer metal increases, resulting in poor corrosion resistance.
（４）異種めっき液を使用するため、既存ラインでは設
備改造が必要である。(4) Because different types of plating solutions are used, existing lines require equipment modification.
（５）異種めっき液を使用するため、そのコンタミによ
る品質劣化が発生する。またコンタミ管理にコストがか
かる。(5) Since different types of plating solutions are used, quality deterioration occurs due to contamination. Also, contamination control is costly.
〈発明が解決しようとする課題〉
本発明の目的は、以上のような問題点を解消した化成処
理性に優れたＺｎ系合金電気めっき鋼板の製造方法を提
供することである。<Problems to be Solved by the Invention> An object of the present invention is to provide a method for manufacturing a Zn-based alloy electroplated steel sheet that eliminates the above-mentioned problems and has excellent chemical conversion treatment properties.
く課題を解決するための手段〉
本発明者らは前記化成処理むらの原因について鋭意研究
調査を行った。Means for Solving the Problems> The present inventors have conducted extensive research and investigation into the cause of the uneven chemical conversion treatment.
例えばＺｎ−Ｎｉ合金電気めっきの化成むらの発生して
いるものは、水酸化亜鉛、酸化亜鉛等の被膜がめつき表
層に多くかつ不均一に生成しており、化成むらの発生の
ないものは、その生成量が少なくてしかも均一であるこ
とをつきとめた。すなわち化成処理むらの原因は、めっ
き表層に存在する水酸化亜鉛等の被膜が多く、しかも不
均一に生成していることにありミこれにより化成処理反
応に差異が生じ、化成むらが発生することが明らかにな
った。For example, when Zn-Ni alloy electroplating has uneven chemical formation, many films of zinc hydroxide, zinc oxide, etc. are formed unevenly on the plating surface layer, whereas when there is no uneven chemical formation, It was found that the amount produced was small and uniform. In other words, the cause of uneven chemical conversion treatment is that there are many films of zinc hydroxide, etc. that exist on the plating surface layer, and they are formed unevenly.This causes differences in the chemical conversion reaction and causes uneven chemical conversion. It became clear.
そこで、本発明者らは、既存のＺｎ系合金電気めっき設
備を何ら変更することなく、かつ数便用のめっき、液の
使用を前提として、Ｚｎ系合金電気めっきの表層への水
酸化亜鉛等の被ｉ住成を抑制し、かつ均一化する方法に
ついて種々検討を重ね、その結果、本発明に到達した。Therefore, the present inventors applied zinc hydroxide, etc. to the surface layer of Zn-based alloy electroplating without making any changes to the existing Zn-based alloy electroplating equipment, and on the premise that the plating solution would be used for several times. As a result of various studies on methods for suppressing and uniformizing the formation of I, the present invention has been achieved.
すなわち本発明は、複数の同一浴組成のめっき櫂を用い
て＃板に連続的にＺｎ系合金電気めっきを施すに当たり
、最終めっき楢におけるめっき付着量をＩｇ／イ以下に
制限し、しかる後さらに同一浴組成のめっき液中に無電
解浸漬することを特徴とする化成処理性に優れたＺｎ系
合金電気めっき鋼板の製造方法である。That is, the present invention limits the amount of plating deposited on the final plating layer to Ig/I or less when continuously electroplating Zn-based alloy on ## plate using a plurality of plating paddles having the same bath composition, and then further This is a method for manufacturing a Zn-based alloy electroplated steel sheet with excellent chemical conversion treatment properties, which is characterized by electroless immersion in a plating solution having the same bath composition.
なお、本発明は、最終めっき槽板前の各めっき槽当たり
のめっき付着量がＩｇ／ｒｒｌを超える通常のＺｎ系合
金電気めっきを対象としている。Note that the present invention is directed to normal Zn-based alloy electroplating in which the amount of plating deposited in each plating tank before the final plating tank plate exceeds Ig/rrl.
また、本発明は、片面めっきあるいは両面めっきいずれ
をもその対象とするものである。Furthermore, the present invention is applicable to either single-sided plating or double-sided plating.
〈作 用〉 以下、本発明の詳細な説明する。<For production> The present invention will be explained in detail below.
電気めっきは、通常連続的に配置される複数のめっき槽
を用いて行われるが、本発明ではこのような複数のめっ
き槽による同一浴組成のめっき液を用いたＺｎ系合金電
気めっきにおいて、最終めっき槽でのめっき付着量を１
ｇ／ｍ２以下に限定する。Electroplating is usually carried out using a plurality of plating tanks arranged in series, but in the present invention, in Zn-based alloy electroplating using a plating solution of the same bath composition in such a plurality of plating tanks, the final The amount of plating deposited in the plating bath is 1
g/m2 or less.
従来、−ａ的に行われている電気めっきでは、各めっき
槽に対し、はぼ均等な電流密度配分により、各めっき槽
においてほぼ同量のめっき付着量が確保される。これに
対し本発明では、最終めっき槽のめっき付着量に上記の
ような上限を設けるものである。このため、その付着量
は最終めっき槽板前のめっき槽における各付着量に比べ
実質的に少ないものとなる。めっき付着量は、電流密度
。Conventionally, in electroplating that is carried out in a conventional manner, almost the same amount of plating is secured in each plating tank by distributing the current density almost evenly to each plating tank. In contrast, in the present invention, the above-mentioned upper limit is set for the amount of plating deposited in the final plating tank. Therefore, the amount of adhesion is substantially smaller than the amount of each adhesion in the plating tank before the final plating tank plate. The amount of plating is determined by the current density.
陽極面積、めっき時間即ち鋼板のめっき槽通仮時間の選
択により変えることができる０例えば既存設備の場合に
は、最終めっき槽の電流密度、陽極面積の選択により本
発明の条件を満足させることができる。For example, in the case of existing equipment, the conditions of the present invention can be satisfied by selecting the current density of the final plating tank and the anode area. can.
また、通常の電気めっき設備においてめっき時間が短く
なるように配慮した最終めっき槽を設け、めっきを行う
ようにすることもできる。Further, plating can be carried out by providing a final plating bath designed to shorten the plating time in ordinary electroplating equipment.
本発明では、最終めっき槽で行うめっきと、最終めっき
槽板前のめっき槽で行うめっきとは同一浴組成のめっき
液によりなされる。また、めっき浴ｐｌ＋および浴温度
も同一条件で行えばよい。In the present invention, the plating performed in the final plating tank and the plating performed in the plating tank in front of the final plating tank plate are performed using a plating solution having the same bath composition. In addition, plating bath pl+ and bath temperature may be performed under the same conditions.
最終めっき槽での付着量カ月ｇ／ｍ未満で化成処理性が
改善できる理由は不明であるが、一方最終めっき槽にお
けるめっき付着量が０．１ｇ／ｒｔｆ未溝になると最終
めっき槽板前に行われためっき皮膜の影響を受け、化成
処理性の改善効果が少なくなる。従って最終めっき槽で
の目付量は好ましくは０．１〜Ｉｇ／ボの範囲である。It is unclear why the chemical conversion processability can be improved when the coating amount in the final plating tank is less than 0.1g/rtf, but on the other hand, when the coating amount in the final plating tank becomes 0.1 g/rtf, it is necessary to The effect of improving chemical conversion treatment properties is reduced due to the influence of the plating film. Therefore, the basis weight in the final plating tank is preferably in the range of 0.1 to Ig/bo.
次に、本発明ではさらに無電解浸漬処理を加えることに
より、前述の化成処理性の劣化原因であるめっき表層の
水酸化亜鉛等の被膜をさらに完全に熔解除去し、化成処
理性をより一層改善するものである。Next, in the present invention, by further adding an electroless immersion treatment, the film such as zinc hydroxide on the surface layer of the plating, which is the cause of the deterioration of the chemical conversion treatability mentioned above, is further completely melted and removed, further improving the chemical conversion treatability. It is something to do.
この無電解浸漬液のｐｎは０．５以上２．５以下が望ま
しい、その理由は、ｐｉが０．５未満ではめっき層が溶
解過多になり、めっき目付量が低下するため経済的に不
利である。またｐｎが２．５を超えると、溶解力が低下
するため浸漬時間を長く必要とし、生産能力の低下をき
たすため得策ではない。The pn of this electroless immersion liquid is preferably 0.5 or more and 2.5 or less.The reason is that if pi is less than 0.5, the plating layer will dissolve too much and the plating area weight will decrease, which is economically disadvantageous. be. Furthermore, if pn exceeds 2.5, the dissolving power decreases, requiring a longer soaking time, which reduces production capacity, which is not a good idea.
浸漬時間は１秒以上２０秒以下が望ましい、浸漬時間を
２０秒を趙えて長くすることは生産性の低下をきたすた
め得策ではなく、またかえって化成処理性の低下をきた
す、また、１秒未満では化成処理性の改善効果が少ない
。The immersion time is preferably 1 second or more and 20 seconds or less. Extending the immersion time beyond 20 seconds is not a good idea as it will reduce productivity, and will even reduce chemical conversion properties. Also, it is less than 1 second. In this case, the effect of improving chemical conversion treatment properties is small.
本発明におけるＺｎ系合金電気めっきとは、ＺｎＮｉ系
、Ｚｎ−Ｆｅ系、Ｚｒ＋−ＦＩｎ系、Ｚｎ−Ａｌ系など
の合金めっき、さらにはこれらを含む複層めっきがあり
、それらにＣ０２Ｃ「、Ｓｎ、 Ｓｂ、 Ｖ、Ｆｅ、
Ｔｉ、 Ｐ、 ＴＩ、＾ｓ、 Ｐｂ、 Ｂｉ、Ｉｎ、
Ｃｄ、 Ｉｒなどが不可避的に混入あるいは故意に添加
しても何らさしつかえない。Zn-based alloy electroplating in the present invention includes alloy plating such as ZnNi-based, Zn-Fe-based, Zr+-FIn-based, Zn-Al-based, and multilayer plating containing these. , Sb, V, Fe,
Ti, P, TI, ^s, Pb, Bi, In,
There is no problem even if Cd, Ir, etc. are unavoidably mixed in or added intentionally.
めっき方式としては水平式、縦型式、ラジアルセルなど
の従来既知の方式が適用できる。めっき浴としては硫酸
塩浴、塩化物浴およびこれらの混合浴を用いればよい。As the plating method, conventionally known methods such as a horizontal method, a vertical method, and a radial cell method can be applied. As the plating bath, a sulfate bath, a chloride bath, or a mixed bath thereof may be used.
〈実施例〉 次に本発明を実施例に基づいて説明する。<Example> Next, the present invention will be explained based on examples.
板厚０．７ｍの５ＰＣＣ相当の冷延綱板を最終めっき楢
を含めてＩＯ槽からなる電気めっき設備を用いて、以下
に示す条件でめっき付着量２０ｇ／ｒｒｆのＺｎ−Ｎｉ
合金めっきを施した。A cold-rolled steel sheet equivalent to 5PCC with a thickness of 0.7 m, including the final plating plate, was coated with Zn-Ni with a coating weight of 20 g/rrf under the conditions shown below using electroplating equipment consisting of an IO bath.
Alloy plated.
めっき浴組成
Ｎ１５Ｏｎ・６Ｈ□ｏ： ２５０ｇ／ｌＺｎ５Ｏａ
・７ ＨｉＯ： １３０ ｇ ／ ＩＮａｚｓｏａ
： ４０ｇ／７！めっき条件
ｐＨ： １．２５
浴温 ：６０℃
電流密度
最終めっき槽板前の各めっき槽：５０Ａ／ｄｊなお、最
終めっき槽での電流密度および付着量は第１表に示す。Plating bath composition N15On/6H□o: 250g/lZn5Oa
・7 HiO: 130 g / INazsoa
: 40g/7! Plating conditions pH: 1.25 Bath temperature: 60°C Current density Final plating tank Each plating tank before the plate: 50 A/dj The current density and coating amount in the final plating tank are shown in Table 1.
めっき後直ちに後続して上記と同じｍｌ成のめっき浴で
、第１表に示すように無電解処理を行い、その後、水洗
、乾燥した。なお、浸漬に用いた浴のｐＨｊＭ整は硫酸
及び水酸化ナトリウムで行った。Immediately after plating, electroless treatment was performed as shown in Table 1 in a plating bath with the same ml composition as above, followed by washing with water and drying. Note that the pHjM of the bath used for immersion was adjusted using sulfuric acid and sodium hydroxide.
化成処理は、日本ペイント製のりん酸塩処理液グラノヂ
ンＳ Ｄ２５０Ｇ （デイツプ方式）を用いて行った。The chemical conversion treatment was performed using a phosphate treatment liquid Granodin SD250G (dip method) manufactured by Nippon Paint.
化成処理性の評価は、外観を目視判定するとともに、各
々ＩＯケ所ずつランダムに走査型電顕観察を行い、結晶
の均一性、緻密さ等によって評価した。このときの化成
皮膜の評価基準は以下の通りである。Chemical conversion treatment properties were evaluated by visual judgment of the appearance, and scanning electron microscopy was performed randomly at each IO location, and evaluation was made based on the uniformity, density, etc. of the crystals. The evaluation criteria for the chemical conversion film at this time are as follows.
化成皮膜外観評価：
５・・・外観は均一でむらはなく、結晶も１０個所とも
均一で緻密。Chemical conversion film appearance evaluation: 5...The appearance is uniform and without unevenness, and the crystals are uniform and dense in all 10 locations.
４・・・外観は均一でむらはないが、結晶が２個所やや
不均一
３・・・外観は均一でむらはないが、結晶が４個所やや
不均一
２・・・外観は一部にむらがあり、結晶は１０個所とも
不均一で、そのうち５個所は粗大粒と微細粒の混粒。4... Appearance is uniform and not uneven, but there are two crystals that are slightly uneven 3... Appearance is uniform and not uneven, but there are 4 crystals that are slightly uneven 2... Appearance is uneven in some areas The crystals are non-uniform in all 10 locations, and 5 of them are a mixture of coarse and fine grains.
１・・・外観は全面にむらがあり、結晶は１０個所とも
粗大粒と微細粒の混粒。1...The appearance is uneven over the entire surface, and the crystals are a mixture of coarse grains and fine grains in all 10 locations.
耐温水二次密着性試験は、化成処理後カチオン電着塗装
（パワートップＵ−３０、日本ペイント製）２０ｎ、中
塗り３０ｎ、上塗り４０μ（ともにアミノアキラド系塗
料、日本ペイント製）、合計９０ｎの３コート塗装を行
い、液温５０℃の純水中に２４０時間浸漬後、１０個所
について塗膜面にナイフで素地に達する２閣四方の基盤
目状の傷を１００個つけ、セロハンテープ剥離を２回行
い、塗膜の残存率（％）を求めた。耐水二次密着性の評
価は下記の通りである。The hot water secondary adhesion test was conducted using 20n of cationic electrodeposition coating (Power Top U-30, manufactured by Nippon Paint) after chemical conversion treatment, 30n of intermediate coating, and 40μ of top coating (both aminoacryado-based paints, manufactured by Nippon Paint), totaling 90n. After applying the coating and immersing it in pure water at a temperature of 50°C for 240 hours, use a knife to make 100 scratches on the coating surface in the shape of a base board on both sides with a knife, and remove with cellophane tape for 2 hours. The remaining rate (%) of the coating film was determined. Evaluation of water resistant secondary adhesion is as follows.
５・・・１０個所の塗膜残存率の平均値が １００％４
・・・ ９０〜９９％３・
・・ ７０〜８９％２・・
・ ５０〜６９％１・・・
５０％未満それぞれの結
果を第１表に示す。5...The average value of the coating film remaining rate at 10 locations is 100%4
... 90-99%3.
・・70～89%2・・
・50-69%1...
The results for each case of less than 50% are shown in Table 1.
また、比較例として後続処理の前までは実施例と同様に
めっきした鋼板に第１表の比較例１〜１０に示す陰極処
理及び／又は無電解処理を施したもの、比較例１１の何
ら後続処理を施さないものについて同様に化成処理性と
耐水二次密着性を評価し〈発明の効果〉
以上詳述したように、本発明によれば、既存のＺｎ系合
金電気めっき設備をなんら変更することなく、かつ数便
用のめっき液を使用して化成処理性を容品に改善するこ
とができる。In addition, as a comparative example, a steel plate plated in the same manner as in the example before the subsequent treatment was subjected to the cathodic treatment and/or electroless treatment shown in Comparative Examples 1 to 10 in Table 1, and a steel plate plated in the same manner as in the example before the subsequent treatment was applied. Chemical conversion treatment properties and water resistant secondary adhesion were evaluated in the same manner for those without treatment. <Effects of the Invention> As detailed above, according to the present invention, existing Zn-based alloy electroplating equipment is not changed in any way. It is possible to improve the chemical conversion treatment properties of the product by using a plating solution for several times.
Claims (1)
ｎ系合金電気めっきを施すに当たり、最終めっき槽にお
けるめっき付着量を１ｇ／ｍ＾２以下に制限し、しかる
後さらに同一浴組成のめっき液中に無電解浸漬すること
を特徴とする化成処理性に優れたＺｎ系合金電気めっき
鋼板の製造方法。Z coating is applied continuously to steel plates using multiple plating baths with the same bath composition.
When performing n-based alloy electroplating, the amount of plating deposited in the final plating bath is limited to 1 g/m^2 or less, and then further electroless immersion is performed in a plating solution with the same bath composition. A method for manufacturing a Zn-based alloy electroplated steel sheet with excellent properties.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1616690A JPH03223490A (en) | 1990-01-29 | 1990-01-29 | Production of steel sheet electroplated with zn alloy excellent in chemical conversion treating property |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1616690A JPH03223490A (en) | 1990-01-29 | 1990-01-29 | Production of steel sheet electroplated with zn alloy excellent in chemical conversion treating property |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03223490A true JPH03223490A (en) | 1991-10-02 |
Family
ID=11908926
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1616690A Pending JPH03223490A (en) | 1990-01-29 | 1990-01-29 | Production of steel sheet electroplated with zn alloy excellent in chemical conversion treating property |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03223490A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007308734A (en) * | 2006-05-16 | 2007-11-29 | Jfe Steel Kk | Method for manufacturing electrogalvanized steel sheet |
-
1990
- 1990-01-29 JP JP1616690A patent/JPH03223490A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007308734A (en) * | 2006-05-16 | 2007-11-29 | Jfe Steel Kk | Method for manufacturing electrogalvanized steel sheet |
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