JPH02145778A - Zn-fe flash plating method for alloyed hot dip galvanized steel sheet - Google Patents
Zn-fe flash plating method for alloyed hot dip galvanized steel sheetInfo
- Publication number
- JPH02145778A JPH02145778A JP30148488A JP30148488A JPH02145778A JP H02145778 A JPH02145778 A JP H02145778A JP 30148488 A JP30148488 A JP 30148488A JP 30148488 A JP30148488 A JP 30148488A JP H02145778 A JPH02145778 A JP H02145778A
- Authority
- JP
- Japan
- Prior art keywords
- steel sheet
- alloyed hot
- dip galvanized
- flash plating
- galvanized steel
- 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
- 238000007747 plating Methods 0.000 title claims abstract description 57
- 229910001335 Galvanized steel Inorganic materials 0.000 title claims abstract description 32
- 239000008397 galvanized steel Substances 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims description 19
- 238000005096 rolling process Methods 0.000 claims abstract description 11
- 238000009499 grossing Methods 0.000 claims description 13
- 238000005260 corrosion Methods 0.000 abstract description 12
- 230000007797 corrosion Effects 0.000 abstract description 12
- 229910000831 Steel Inorganic materials 0.000 abstract description 11
- 239000010959 steel Substances 0.000 abstract description 11
- 239000011248 coating agent Substances 0.000 abstract description 9
- 238000000576 coating method Methods 0.000 abstract description 9
- 230000001105 regulatory effect Effects 0.000 abstract 3
- 238000010422 painting Methods 0.000 description 10
- 238000004070 electrodeposition Methods 0.000 description 6
- 239000003973 paint Substances 0.000 description 5
- 125000002091 cationic group Chemical group 0.000 description 4
- 238000005246 galvanizing Methods 0.000 description 3
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 3
- 101000993059 Homo sapiens Hereditary hemochromatosis protein Proteins 0.000 description 2
- 229910019142 PO4 Inorganic materials 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 2
- 239000010452 phosphate Substances 0.000 description 2
- 229920000298 Cellophane Polymers 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 241000287828 Gallus gallus Species 0.000 description 1
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 239000010960 cold rolled steel Substances 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 239000006258 conductive agent Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 230000009931 harmful effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 235000012149 noodles Nutrition 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
Landscapes
- Other Surface Treatments For Metallic Materials (AREA)
- Electroplating Methods And Accessories (AREA)
Abstract
Description
【発明の詳細な説明】
童栗上■科朋公国
本発明は、合金化溶融亜鉛めっき網板へのＺｎ−Ｆｅフ
ラッシュめっき方法に関し、詳しくは、合金化溶融亜鉛
めっき網板に耐クレーター性、加工性、塗装後の塗膜鮮
映性、耐食性等にすぐれるめっき層を形成し得るＺｎ−
Ｆｅフラッシュめっき方法に関する。[Detailed Description of the Invention] The present invention relates to a method of Zn-Fe flash plating on an alloyed hot-dip galvanized mesh plate, and more specifically, the invention relates to a method for Zn-Fe flash plating on an alloyed hot-dip galvanized mesh plate, and more particularly, it provides crater resistance, Zn- can form a plating layer with excellent processability, film clarity after painting, corrosion resistance, etc.
This invention relates to a Fe flash plating method.
従来■■酉
従来、自動車用ｔｉＡ板としては、車体内面には、主と
して表面処理鋼板が用いられており、車体外面には、塗
装性にすぐれる冷延鋼板が用いられている。しかし、最
近においては、車体外面においても、発錆を防止するた
めに、表面処理鋼板が用いられ始めており、なかでも、
塗装後の耐食性や塗膜の密着性の観点から、合金化溶融
亜鉛めっき銅板が多く用いられる傾向にある。Conventional ■■ Rooster Conventionally, as TiA plates for automobiles, surface-treated steel sheets have been mainly used for the inner surface of the vehicle body, and cold-rolled steel sheets with excellent paintability have been used for the outer surface of the vehicle body. However, recently, surface-treated steel sheets have begun to be used on the outside of car bodies to prevent rust.
From the viewpoint of corrosion resistance after painting and adhesion of the paint film, alloyed hot-dip galvanized copper plates tend to be used more often.
ここに、合金化溶融亜鉛めっき鋼板は、そのカチオン電
着塗装時に、塗装表面に凹み、即ち、クレータ−が著し
く発生しやすく、耐クレーター性に劣るので、従来、合
金化溶融亜鉛めっきの一ヒに、Ｆｅ含有率の高いＺｎ−
Ｆｅフラッシュめっきを施す方法が採用されている。Here, when alloyed hot-dip galvanized steel sheets are coated with cationic electrodeposition, dents, or craters, are extremely likely to occur on the painted surface, and the crater resistance is poor, so conventionally, only one method of alloyed hot-dip galvanized steel sheets has been used. In addition, Zn- with high Fe content
A method of applying Fe flash plating is adopted.
しかしながら、合金化溶融亜鉛めっき鋼板は、その表面
が主として柱状晶のδ７合金からなり、粗いために、Ｚ
ｎ−Ｆｅフラッシュめっきが均一に付着し難く、かくし
て、フラッシュめっきにて被覆されていない部分におい
て耐クレーター性に劣る。他方、かかるフラッシュめっ
きにて被覆されない部分の生起を防ぐために、フラッシ
ュめっきの付着量を増やすときは、塗装後に偏部の赤錆
発生が増加し、また、耐ブリスター性や耐大あき性のい
ずれにも有害な影響を与える。更に、前述したように、
合金化溶融亜鉛めっき鋼板は、表面が粗いために、塗装
後の塗膜の鮮映性に劣る。However, the surface of the alloyed hot-dip galvanized steel sheet is mainly composed of columnar crystal δ7 alloy and is rough, so the Z
It is difficult for n-Fe flash plating to adhere uniformly, and thus the crater resistance is poor in areas not covered by flash plating. On the other hand, when increasing the amount of flash plating applied in order to prevent the occurrence of areas that are not covered by such flash plating, the occurrence of red rust in uneven areas after painting will increase, and the blister resistance and large crack resistance will be affected. also have harmful effects. Furthermore, as mentioned above,
Since the surface of alloyed hot-dip galvanized steel sheets is rough, the sharpness of the paint film after painting is poor.
が”° しようとする
本発明は、合金化溶融亜鉛めっき鋼板へのＺｎＦｅフラ
ッシュめっきにおける上記した種々の問題を解決するた
めになされたものであって、Ｆｅ含有率の高いＺｎ−Ｆ
ｅフラッシュめっきをその表面に均一に付着させること
ができる合金化溶融亜鉛めっき鋼板へのＺｎ−Ｆｅフラ
ッシュめっき方法を提供することを目的とする。The present invention was made to solve the various problems described above in ZnFe flash plating on alloyed hot-dip galvanized steel sheets.
It is an object of the present invention to provide a method for flash plating Zn-Fe on an alloyed hot-dip galvanized steel sheet, which allows e-flash plating to be uniformly adhered to the surface thereof.
摩皿奎Ｍ次工玉友ム曳王Ｒ
本発明は、合金化溶融亜鉛めっき鋼板へのＺｎ−Ｆｅフ
ラッシュめっき方法において、めっき層中のＦｅｌが５
〜３０重量％である合金化溶融亜鉛めっき鋼板に圧延を
施し、その表面平滑化率を３０〜９０％とした後、Ｚｎ
−Ｆｅフラッシュめっき層のＦｅ量を６０〜９５重量％
とじ、且つ、フラッシュめっき付着量を２〜ＩＯｇ／ｍ
とするＺｎ−Ｆｅフラッシュめっきを施すことを特徴と
する。The present invention provides a Zn-Fe flash plating method for alloyed hot-dip galvanized steel sheets, in which Fel in the plating layer is 5.
After rolling an alloyed hot-dip galvanized steel sheet with a Zn content of ~30% by weight to a surface smoothing rate of 30% to 90%,
-Fe amount of the Fe flash plating layer is 60 to 95% by weight
Binding and flash plating adhesion amount of 2 to IOg/m
It is characterized by applying Zn-Fe flash plating.
第１図に腐食深さに及ぼす合金化溶融亜鉛めっき層中の
Ｆｅｌの影響を示す。サイクルは、５ＳＴ（５０℃Ｘ１
８ｈｒ）−乾燥（７０℃Ｘ２ｈｒ）−浸漬（５％食塩水
、５０℃Ｘ２ｈｒ）→乾燥（室温ｘ２ｈｒ） （この
後、ＳＳＴに戻る。）とした。腐食深さは、Ｆｅ量が５
〜３０重量％において最小となる。Ｆｅｊｌが５重量％
よりも少ないときは、めっき表面に合金化むらが生じ、
他方、Ｆｅ量が３０重量％を越えるときは、めっき被膜
の加工性が劣化する。従って、本発明においては、合金
化溶融亜鉛めっき層中のＦｅ量を５〜３０重量％とする
。FIG. 1 shows the influence of Fel in the alloyed hot-dip galvanized layer on the corrosion depth. The cycle is 5ST (50℃ x 1
8 hr) - Drying (70°C x 2 hr) - Soaking (5% saline, 50°C x 2 hr) -> Drying (room temperature x 2 hr) (After this, return to SST.) The corrosion depth is determined by the amount of Fe being 5.
Minimum occurs at ~30% by weight. Fejl is 5% by weight
When the amount is less than , uneven alloying occurs on the plating surface,
On the other hand, when the amount of Fe exceeds 30% by weight, the workability of the plating film deteriorates. Therefore, in the present invention, the amount of Fe in the alloyed hot-dip galvanized layer is set to 5 to 30% by weight.
前述したように、合金化溶融亜鉛めっき鋼板の表面は、
柱状の６１合金からなるので、凹凸が著しい。そのため
に、合金化溶融亜鉛めっき鋼板にＺｎ−Ｆｅフラッシュ
めっきを施す場合、フラッシュめっきが凸部に集中する
結果、表面に均一に付着し難い、フラッシュめっきによ
って被覆されない部分や、被覆されても、被膜が極めて
薄いときは、電着塗装時に耐クレーター性が悪くなる。As mentioned above, the surface of the alloyed hot-dip galvanized steel sheet is
Since it is made of columnar 61 alloy, it has significant unevenness. For this reason, when applying Zn-Fe flash plating to an alloyed hot-dip galvanized steel sheet, the flash plating concentrates on the convex parts, making it difficult to adhere uniformly to the surface, and areas that are not covered by flash plating, or even if coated. If the film is extremely thin, the crater resistance will be poor during electrodeposition coating.
そこで、本発明によれば、フラッシュめっきによる付着
を均一なものとするために、予め合金化溶融亜鉛めっき
鋼板に圧延を施し、その表面を平滑化する。本発明の方
法においては、合金化溶融亜鉛めっき鋼板に特徴的な表
面の微細な凹凸を平滑化すれば足りるので、上記圧延は
、一般的な圧延によることができる。従って、例えば、
スキンバス圧延にて軽圧下すればよい、圧延ロールは、
ダル、ブライト等、いずれでもよい。Therefore, according to the present invention, in order to make the adhesion by flash plating uniform, the alloyed hot-dip galvanized steel sheet is rolled in advance to smooth its surface. In the method of the present invention, it is sufficient to smooth out the fine irregularities on the surface characteristic of alloyed hot-dip galvanized steel sheets, so the above-mentioned rolling can be carried out by general rolling. Therefore, for example,
The rolling roll can be lightly rolled by skin bath rolling.
Dull, bright, etc. are fine.
次に、第２図にスキンバス率と合金化溶融亜鉛めっきｔ
Ｉｉ４板の表面の平滑化率との関係を示すように、スキ
ンバス率を高めるにつれて、合金化溶融亜鉛めっき鋼板
の表面の平滑化率が高くなる。尚、本発明において、表
面平滑化率とは、合金化溶融亜鉛めっき鋼板の表面の微
細な粗さ又は凹凸が上記圧延によって平滑にされた部分
の面積率を３８Ｍ写真にて測定した値をいうものとする
。Next, Figure 2 shows the skin bath ratio and alloyed hot-dip galvanizing t.
As shown in the relationship with the surface smoothing ratio of the Ii4 plate, as the skin bath ratio is increased, the surface smoothing ratio of the alloyed hot-dip galvanized steel sheet increases. In the present invention, the surface smoothing ratio refers to a value measured using a 38M photograph of the area ratio of the portion where fine roughness or irregularities on the surface of the alloyed hot-dip galvanized steel sheet have been smoothed by the above-mentioned rolling. shall be taken as a thing.
第３図は、合金化溶融亜鉛めっき鋼板の表面平滑化率と
電着塗装時の耐クレーター性との関係を示し、フラッシ
ュめっきの前処理として、前記圧延を施して、合金化溶
融亜鉛めっき鋼板の表面平滑化率を３０％以上とするこ
とによって、フラッシュめっきが均一に付着し、耐クレ
ーター性が著しく改善される。しかし、圧延による圧下
率を過度に高くして、表面平滑化率が９０％を越えると
きは、合金化溶融亜鉛めっき鋼板のめつき層に微細なり
ラックが生じて、めっき被膜の加工性が劣化する。従っ
て、本発明の方法においては、合金化溶融亜鉛めっき鋼
板へのフラッシュめっきの前処理としての圧延による平
滑化率は、３０〜９０％の範囲とする。更に、スキンバ
ス率が１％を越えるときは、めっき母材の加工性が悪く
なるので、合金化溶融亜鉛めっき鋼板の表面平滑化率は
、３０〜７０％の範囲が好ましい。Figure 3 shows the relationship between the surface smoothing rate of an alloyed hot-dip galvanized steel sheet and the crater resistance during electrodeposition coating. By setting the surface smoothing rate to 30% or more, the flash plating will adhere uniformly and the crater resistance will be significantly improved. However, when the rolling reduction rate is excessively high and the surface smoothing rate exceeds 90%, fine cracks occur in the plating layer of the alloyed hot-dip galvanized steel sheet, which deteriorates the workability of the plating film. do. Therefore, in the method of the present invention, the smoothing rate by rolling as a pretreatment for flash plating on alloyed hot-dip galvanized steel sheets is in the range of 30 to 90%. Furthermore, when the skin bath ratio exceeds 1%, the workability of the plating base material deteriorates, so the surface smoothing ratio of the alloyed hot-dip galvanized steel sheet is preferably in the range of 30 to 70%.
更に、合金化溶融亜鉛めっき調板は、その塗装後、表面
の凹凸が残存して、鮮映性に劣るが、本発明の方法によ
れば、上記圧延によって、塗装後の鮮映性も改善される
。Furthermore, after painting, alloyed hot-dip galvanized tone plates have surface irregularities that remain, resulting in poor image clarity; however, according to the method of the present invention, the image clarity after painting is improved by the above-mentioned rolling. be done.
本発明の方法によれば、このように、合金化溶融亜鉛め
っき鋼板を予め圧延した後、これにフランシュめっきを
施す。ここに、フラッシュめっきの付着量は、２〜ｌ
Ｏｇ７ 、（の範囲とする。フラッシュめっきの付着量
が２ ｇ／ｒｒｒよりも少ないときは、フラッシュめっ
きによって被覆されない表面部分や、掻く薄くのみ被覆
される部分が残るので、クレータ−性の改善効果に乏し
い。他方、フラッシュめっきの付着量が１０ｇ／ｉを越
えるときは、下層の合金化溶融亜鉛めっきによる犠牲防
食能が及ばなくなり、Ｆｅ量の多い腐食性成分に変化す
るので、赤錆が多くなり、ブリスターや板厚減少値も多
くなる。更に、めっき被膜の加工性も劣化する。According to the method of the present invention, after the alloyed hot-dip galvanized steel sheet is rolled in advance, it is subjected to Franche plating. Here, the amount of flash plating deposited is 2 to 1
When the amount of flash plating is less than 2 g/rrr, some surface parts are not covered by flash plating or some parts are coated only thinly. On the other hand, when the amount of flash plating exceeds 10 g/i, the sacrificial anticorrosion ability of the underlying alloyed hot-dip galvanizing becomes insufficient, and it changes to a corrosive component with a high Fe content, resulting in increased red rust. , blisters and plate thickness reduction values increase.Furthermore, the workability of the plating film also deteriorates.
更に、本発明の方法においては、フラッシュめっきのＦ
ｅ重量は、６０〜９５重量％である。６０重量％よりも
少ないときは、耐クレーター性の改善が乏しく、他方、
９５重量％を越えるときは、塗装後の耐食性が十分でな
い。Furthermore, in the method of the present invention, F of flash plating is
e weight is 60-95% by weight. When it is less than 60% by weight, the improvement in crater resistance is poor; on the other hand,
If it exceeds 95% by weight, the corrosion resistance after coating will not be sufficient.
本発明の方法において、フラッシュめっきの条件は特に
限定されるものではないが、通常、めっき浴中の金属イ
オン濃度は、Ｆｅｚ“を１０〜７０ｇ／Ｉ！、Ｚｎ”を
１〜Ｌｏｇ／１２（Ｄ範囲とし、これにＮａ＋やＮ Ｈ
４’等の導電剤を加えてもよい。In the method of the present invention, the flash plating conditions are not particularly limited, but the metal ion concentration in the plating bath is usually 10 to 70 g/I! for Fez and 1 to Log/12 for Zn. D range, and Na+ and NH
A conductive agent such as 4' may also be added.
かかるめっき浴をｐＨ１□〜３、浴温４０〜７０℃、Ｆ
ｅ”を５ ｇ／Ｉ！以下とし、電流密度２０〜１２０Ａ
／ｄａ＋”にて行なうのが好ましい。The plating bath has a pH of 1□ to 3, a bath temperature of 40 to 70°C, F.
e” is 5 g/I! or less, and the current density is 20 to 120 A.
/da+'' is preferable.
尤朋ｐ力果
本発明の方法によれば、以上のように、合金化溶融亜鉛
めっき鋼板に予め圧延を施こし、これに所定の条件にて
Ｚｎ−Ｆｅフラッシュめっきを施すので、耐クレータ性
、加工性、塗装後の塗膜の鮮映性、耐食性等にすぐれる
Ｚｎ−Ｆｅフラッシュめっき鋼板を得ることができる。According to the method of the present invention, as described above, the alloyed hot-dip galvanized steel sheet is rolled in advance and Zn-Fe flash plating is applied to it under predetermined conditions, so that the crater resistance is improved. It is possible to obtain a Zn-Fe flash plated steel sheet having excellent workability, sharpness of the coated film after coating, corrosion resistance, etc.
ｚ麺玉
以下に実施例を挙げて本発明を説明するが、本発明はこ
れら実施例により何ら限定されるものではない。Z Noodles The present invention will be explained below with reference to Examples, but the present invention is not limited to these Examples in any way.
めっき目付量４５ ／ ４５ ｇ ／ ％、めっき層Ｆ
ｅ量１０重量％又は２０重量％である合金化溶融亜鉛め
っき鋼板にスキンバスを施して、その表面の平滑化率を
３０％、５０％又は９０％とした後、これに下記の条件
にてフラッシュめっきを施した。Plating weight: 45/45 g/%, plating layer F
After applying a skin bath to an alloyed hot-dip galvanized steel sheet with an e amount of 10% or 20% by weight to make the surface smoothing rate 30%, 50% or 90%, it was applied under the following conditions. Flash plating was applied.
めっき浴組成
Ｐｅ５Ｏ４４Ｈｚ０ ３００ ｇ／ ’Ｚｎ５Ｏａ４Ｈ
ｚ０ １０〜２０ ｇ ／ ＩＮ）ＩｔＣ３１５０ｇ
／ １
電解条件
電流密度 ５０Ａ／ｄｍ”
浴温 ６０℃
ｐｔ＋ １．５
目付量 ２ｇ／ｃｄ、３ ｇ ／ ｎ？又は６ｇ／
耐以上のようにして得られためつき鋼板の特性を第１表
に示す。本発明の方法に従って、合金化溶融亜鉛めっき
泪仮にフラッシュめっきを施すこ上によって、耐クレー
ター性、加工性、塗装後の塗膜鮮映性及び塗装後の耐食
性のすべてにすぐれるめっき鋼板を得ることができる。Plating bath composition Pe5O44Hz0 300 g/'Zn5Oa4H
z0 10~20 g/IN) ItC3150g
/ 1 Electrolytic conditions Current density 50A/dm" Bath temperature 60℃ pt+ 1.5 Fabric weight 2g/cd, 3g/n? or 6g/
Table 1 shows the properties of the tempered steel sheets obtained in the above manner. According to the method of the present invention, by applying alloyed hot-dip galvanizing and temporary flash plating, a plated steel sheet is obtained which is excellent in all of crater resistance, workability, film sharpness after painting, and corrosion resistance after painting. be able to.
尚、上記の特性の評価は以下のようにして行なった。The above characteristics were evaluated as follows.
耐クレーター性
リン酸塩処理（日本バーカラ、イジング■製、ＰＢ３０
８０）を行なった鋼板にカチオン電着塗装（関西ペイン
トｆｉ＋！！！Ｅｆｆ９４０Ｑ）Ｌ、焼き付は後の塗膜
表面の凹み（クレータ−）の数を計測した。■は非常に
よい、○はよい、△はやや劣る、×は劣ることを示す。Crater-resistant phosphate treatment (Nippon Barkara, Ising ■, PB30
80) was subjected to cationic electrodeposition coating (Kansai Paint fi+!!! Eff940Q) L, and the number of dents (craters) on the surface of the coating film after baking was measured. ■ indicates very good, ○ indicates good, △ indicates slightly inferior, and × indicates inferior.
加工性
絞り比２での円筒絞り後、セロハン・テープ剥離試験に
て評価した。◎は剥離なし、Ｏは僅かに剥離あり、△は
剥離がやや多い、×は剥離が多いことを示す。Workability After cylindrical drawing at a drawing ratio of 2, evaluation was made using a cellophane tape peel test. ◎ indicates no peeling, O indicates slight peeling, △ indicates slightly peeling, and × indicates much peeling.
塗装後の塗膜の鮮映性
リン酸塩処理（日本バー力うイジング＠製、Ｐ８３０８
０）を行なった鋼板にカチオン電着塗装（関西ペイント
■製Ｅ１９４００）を２０Ｉ１ｍの厚さに施して、鮮映
性をＤＯＩメーター（ＡＴＩＳＹＳＴＥＭ ＩＮＣ，）
にて測定した。◎は８０以上、○は８０〜７０、△は７
０〜６０、×は６０以下を示す。Phosphate treatment for sharpness of paint film after painting (manufactured by Nippon Baru Ising@, P8308
A cationic electrodeposition coating (E19400 manufactured by Kansai Paint ■) was applied to the steel plate subjected to 0) to a thickness of 20I1m, and the image clarity was measured using a DOI meter (ATISYSTEM INC.).
Measured at ◎ is 80 or more, ○ is 80-70, △ is 7
0 to 60, x indicates 60 or less.
塗装後の耐食性
２０μｍのカチオン電着塗装を施した試験片の表面に小
力にてクロスカットを入れ、５ＳＴ２４時間、一定湿度
下に放置１２０時間及び室内放置２４時間を１サイクル
とするサイクリック腐食試験を１０サイクル行なって、
ブリスター（膨れ）幅を測定した。■は０〜ｉ、ｏｌｍ
、ｏは１．０〜１．５鶴、△は１．５〜２．０鮪、×は
２． Ｏｎ以上を示す。Corrosion resistance after painting A cross cut was made with a small force on the surface of a test piece coated with a cationic electrodeposition coating of 20 μm, and cyclic corrosion was performed in which one cycle was 24 hours of 5ST, 120 hours of being left under constant humidity, and 24 hours of being left indoors. Perform the test for 10 cycles,
Blister width was measured. ■ is 0~i, olm
, o is 1.0 to 1.5 cranes, △ is 1.5 to 2.0 tuna, × is 2. Indicates On or above.
第１図は、腐食深さに及ぼす合金化溶融亜鉛めっき層中
のＦｅｌの影響を示すグラフ、第２図は、合金化溶融亜
鉛めっき鋼板の表面の平滑化率とスキンバス率との関係
を示すグラフ、第３図は、合金化溶融亜鉛めっき鋼板に
Ｚｎ−Ｆｅフラッシュめっきを施した鋼板の耐クレータ
ー性に及ばず合金化溶融亜鉛めっき鋼板の表面平滑化率
の影響を示すグラフである。Figure 1 is a graph showing the influence of Fel in the alloyed hot-dip galvanized layer on the corrosion depth, and Figure 2 shows the relationship between the surface smoothing rate and skin bath rate of the alloyed hot-dip galvanized steel sheet. The graph shown in FIG. 3 is a graph showing the influence of the surface smoothing rate of the alloyed hot-dip galvanized steel sheet, which is not as good as the crater resistance of the steel sheet which has been subjected to Zn-Fe flash plating on the alloyed hot-dip galvanized steel sheet.
Claims (1)
シュめつき方法において、めつき層中のＦｅ量が５〜３
０重量％である合金化溶融亜鉛めつき鋼板に圧延を施し
、その表面平滑化率を３０〜９０％とした後、Ｚｎ−Ｆ
ｅフラッシュめつき層のＦｅ量を６０〜９５重量％とし
、且つ、フラッシュめつき付着量を２〜１０ｇ／ｍ＾２
とするＺｎ−Ｆｅフラッシュめつきを施すことを特徴と
する合金化溶融亜鉛めつき鋼板へのＺｎ−Ｆｅフラッシ
ュめつき方法。(1) In the Zn-Fe flash plating method on alloyed hot-dip galvanized steel sheets, the amount of Fe in the plating layer is 5 to 3
After rolling an alloyed hot-dip galvanized steel sheet with a Zn-F content of 0% by weight to a surface smoothing rate of 30 to 90%,
eThe amount of Fe in the flash plating layer is 60 to 95% by weight, and the amount of flash plating adhesion is 2 to 10 g/m^2
A method for Zn-Fe flash plating on an alloyed hot-dip galvanized steel sheet, the method comprising applying Zn-Fe flash plating to an alloyed hot-dip galvanized steel sheet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30148488A JPH02145778A (en) | 1988-11-28 | 1988-11-28 | Zn-fe flash plating method for alloyed hot dip galvanized steel sheet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30148488A JPH02145778A (en) | 1988-11-28 | 1988-11-28 | Zn-fe flash plating method for alloyed hot dip galvanized steel sheet |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02145778A true JPH02145778A (en) | 1990-06-05 |
Family
ID=17897462
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP30148488A Pending JPH02145778A (en) | 1988-11-28 | 1988-11-28 | Zn-fe flash plating method for alloyed hot dip galvanized steel sheet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02145778A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0480355A2 (en) * | 1990-10-08 | 1992-04-15 | Nkk Corporation | Iron-zinc alloy plated steel sheet having two plating layers and excellent in electropaintability and press-formability |
| JPH05339751A (en) * | 1992-06-04 | 1993-12-21 | Sumitomo Metal Ind Ltd | Plated steel sheet excellent in chipping resistance |
-
1988
- 1988-11-28 JP JP30148488A patent/JPH02145778A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0480355A2 (en) * | 1990-10-08 | 1992-04-15 | Nkk Corporation | Iron-zinc alloy plated steel sheet having two plating layers and excellent in electropaintability and press-formability |
| JPH05339751A (en) * | 1992-06-04 | 1993-12-21 | Sumitomo Metal Ind Ltd | Plated steel sheet excellent in chipping resistance |
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