JPS63145792A - Surface treated steel sheet - Google Patents
Surface treated steel sheetInfo
- Publication number
- JPS63145792A JPS63145792A JP29188786A JP29188786A JPS63145792A JP S63145792 A JPS63145792 A JP S63145792A JP 29188786 A JP29188786 A JP 29188786A JP 29188786 A JP29188786 A JP 29188786A JP S63145792 A JPS63145792 A JP S63145792A
- Authority
- JP
- Japan
- Prior art keywords
- layer
- steel sheet
- pure
- alloy
- treated 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
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 48
- 239000010959 steel Substances 0.000 title claims abstract description 48
- 239000010410 layer Substances 0.000 claims abstract description 54
- 230000007797 corrosion Effects 0.000 claims abstract description 25
- 238000005260 corrosion Methods 0.000 claims abstract description 25
- 229910001297 Zn alloy Inorganic materials 0.000 claims abstract description 17
- 229910052751 metal Inorganic materials 0.000 claims abstract description 11
- 239000002184 metal Substances 0.000 claims abstract description 11
- 239000002344 surface layer Substances 0.000 claims abstract description 10
- 239000000956 alloy Substances 0.000 claims description 11
- 229910045601 alloy Inorganic materials 0.000 claims description 11
- 238000007747 plating Methods 0.000 abstract description 21
- 125000002091 cationic group Chemical group 0.000 abstract description 9
- 238000004070 electrodeposition Methods 0.000 abstract description 9
- 239000003973 paint Substances 0.000 abstract description 9
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 abstract description 7
- 230000007547 defect Effects 0.000 abstract description 5
- 238000000034 method Methods 0.000 abstract description 3
- 229910000640 Fe alloy Inorganic materials 0.000 abstract description 2
- 239000011701 zinc Substances 0.000 description 22
- 239000011248 coating agent Substances 0.000 description 16
- 238000000576 coating method Methods 0.000 description 16
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 9
- 229910052742 iron Inorganic materials 0.000 description 6
- 239000000463 material Substances 0.000 description 4
- 238000010422 painting Methods 0.000 description 3
- 238000004381 surface treatment Methods 0.000 description 3
- 230000003139 buffering effect Effects 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 229910052725 zinc Inorganic materials 0.000 description 2
- 229910000990 Ni alloy Inorganic materials 0.000 description 1
- 229910007567 Zn-Ni Inorganic materials 0.000 description 1
- 229910007614 Zn—Ni Inorganic materials 0.000 description 1
- 229910002065 alloy metal Inorganic materials 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009713 electroplating Methods 0.000 description 1
- 229910000398 iron phosphate Inorganic materials 0.000 description 1
- WBJZTOZJJYAKHQ-UHFFFAOYSA-K iron(3+) phosphate Chemical compound [Fe+3].[O-]P([O-])([O-])=O WBJZTOZJJYAKHQ-UHFFFAOYSA-K 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
- LRXTYHSAJDENHV-UHFFFAOYSA-H zinc phosphate Chemical compound [Zn+2].[Zn+2].[Zn+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O LRXTYHSAJDENHV-UHFFFAOYSA-H 0.000 description 1
- 229910000165 zinc phosphate Inorganic materials 0.000 description 1
Abstract
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は表面処理鋼板に関する。[Detailed description of the invention] (Industrial application field) The present invention relates to a surface-treated steel sheet.
（従来の技術）
鋼の表面処理は、通常、耐孔あき性及び塗膜との密着性
に優れたＺｎ−ＦｅもしくはＺｎ−Ｎｉ合金、または純
Ｚｎによるメッキにより行なわれている。また、該Ｚｎ
系合金メッキ鋼板は、塗装により耐食性が余り向上しな
い、塗装の際に塗膜欠陥を生じる等の問題点があるため
、これを解決するためのメッキ方法またはメッキ綱板が
、特開昭５７−５１２８３号、特開昭５７−６１８３１
号及び特開昭５８−１５５５４号に記載されている。こ
のうち、特開昭５８−１５５５４号に記載のカチオン電
着塗装用のメッキ鋼材は、鋼板上にＺｎ含量４０重量％
以下のＦｅ−Ｚｎ合金からなる表面層と耐食性金属から
なる下層の２層よりなる。これは、鉄を主体とする合金
からなる表面層を用いることにより、カチオン電着塗装
の際にＺｎを主体とする合金層の作用により生じていた
塗膜欠陥を解決し、また耐食性金属よりなる下層により
耐食性を得たことを特徴とするものである。(Prior Art) The surface treatment of steel is usually performed by plating with Zn--Fe or Zn--Ni alloy, or pure Zn, which has excellent porosity resistance and adhesion to paint films. In addition, the Zn
There are problems with the alloy-plated steel sheets, such as the corrosion resistance not being improved much by painting, and defects in the coating film occurring during painting.To solve these problems, a plating method or plated steel sheet was proposed in Japanese Patent Laid-Open No. 57-1999. No. 51283, JP 57-61831
No. 58-15554. Among these, the plated steel material for cationic electrodeposition coating described in JP-A-58-15554 has a Zn content of 40% by weight on the steel plate.
It consists of two layers: a surface layer made of the following Fe-Zn alloy and a lower layer made of a corrosion-resistant metal. By using a surface layer made of an alloy mainly composed of iron, the coating defects that were caused by the action of the alloy layer mainly composed of Zn during cationic electrodeposition coating can be solved, and also by using a surface layer made of a corrosion-resistant metal. It is characterized by the fact that the lower layer provides corrosion resistance.
上記のようなＺｎ合金によりメ・ツキされた鋼板は、防
食性、塗膜密着性に優れており、自動車、家電、建材等
の分野で使用されている。Steel sheets plated with the above Zn alloy have excellent corrosion resistance and coating adhesion, and are used in fields such as automobiles, home appliances, and building materials.
（発明が解決しようとする問題点）
ところで、自動車の走行時、先行車両もしくは自軍によ
り跳ね上げられた飛び石が自動車の車体に当たった場合
、塗膜の剥離が生じる。このとき、第２図に示すような
従来のＺｎ−ＦｅまたはＺｎ−Ｎｉ合金メツキー板９を
自動車の車体として使用している場合、メッキ層７が母
材の鋼板２よりも硬いため、塗膜６のみが剥離すること
は少なく、大抵の場合、硬くて脆いメッキ層７と軟らか
い鋼板２との界面Ａに剥離が生じる。従って、その下の
鋼板２が剥き出しになる。綱板２は耐食性に優れず、こ
こから赤錆８が生じて広がっていくという問題がある。(Problems to be Solved by the Invention) By the way, when a car is running, if a flying stone thrown up by a preceding vehicle or the own troops hits the car body, the paint film will peel off. At this time, when a conventional Zn-Fe or Zn-Ni alloy metal key plate 9 as shown in FIG. 2 is used as a car body, the coating layer 7 is harder than the base steel plate 2, It is rare for only 6 to peel off, and in most cases, peeling occurs at the interface A between the hard and brittle plating layer 7 and the soft steel plate 2. Therefore, the steel plate 2 underneath is exposed. The steel plate 2 does not have excellent corrosion resistance, and there is a problem in that red rust 8 forms and spreads from there.
これは、上記の特開昭５８−１５５５４号に記載の鋼材
の場合でも、表面層及び下層が鋼板より硬いという点に
おいては他の従来方法と同様であるため、上記の問題は
解決されない、一方、純Ｚｎメッキにより表面処理され
た鋼板も市販されているが、Ｚｎはカチオン電着塗膜の
密着性が悪く、下地鋼板に対する犠牲防食能が強すぎ、
また溶出が速いため、充分なＺｎ量がメンキされなけれ
ば謝礼あき性が期待できないなどの欠点がある。カチオ
ン電着等により塗膜を形成するための表面処理鋼板は、
塗膜密着性、耐食性、謝礼あき性の全ての性質が良好で
あり、しかもチッピングを生じた場合に剥離して下地の
鋼板が剥き出しになるようなことのないメッキが施され
ていることが望ましく、従来技術においてはそのような
表面処理鋼板は得られていない。従って本発明は、塗膜
密着性、耐塗装腐蝕性、謝礼あき性及び耐チッピング性
に優れた表面処理鋼板を提供することを目的とする。Even in the case of the steel material described in JP-A No. 58-15554, the above-mentioned problem is not solved because the surface layer and the lower layer are harder than the steel sheet, which is similar to other conventional methods. , Steel sheets surface-treated with pure Zn plating are also commercially available, but Zn has poor adhesion to the cationic electrodeposition coating and has too strong sacrificial corrosion protection against the underlying steel sheet.
In addition, since the dissolution is rapid, there is a drawback that a sufficient amount of Zn cannot be expected unless a sufficient amount of Zn is coated. Surface-treated steel sheets for forming coating films by cationic electrodeposition, etc.
It is desirable that the plating has good properties in terms of paint film adhesion, corrosion resistance, and scratch resistance, and that it will not peel off and expose the underlying steel plate in the event of chipping. However, in the prior art, such a surface-treated steel sheet has not been obtained. Therefore, an object of the present invention is to provide a surface-treated steel sheet with excellent paint film adhesion, paint corrosion resistance, cracking resistance, and chipping resistance.
（問題点を解決するための手段）
上記の目的を達成するために、本発明の表面処理鋼板は
、Ｆｅ−Ｚｎ合金からなる表面層、純Ｚｎ、純Ａｌまた
は純Ｃｕからなる中間層、及び耐食性金属または合金か
らなる下層の３層よりなるメッキが施されていることを
特徴とする。(Means for Solving the Problems) In order to achieve the above object, the surface-treated steel sheet of the present invention has a surface layer made of an Fe-Zn alloy, an intermediate layer made of pure Zn, pure Al, or pure Cu, and It is characterized by being plated with three lower layers made of a corrosion-resistant metal or alloy.
Ｆｅ−Ｚｎ合金層は塗膜との密着性が良く、カチオン電
着等により塗膜を形成した際、塗膜欠陥を生じることの
ないものが好ましい。The Fe-Zn alloy layer preferably has good adhesion to the coating film and does not cause coating defects when the coating film is formed by cationic electrodeposition or the like.
このため、Ｆｅの含有量が多いもの、例えば６０％以上
であるものが好ましい。また、好ましい材料のヴイッカ
ース硬さくＨｖ）は２００ないし３００である。Ｆｅ−
Ｚｎ合金層はＦｅ及びＺｎ以外の金属、例えばＭｎ、Ｓ
ｎ、Ｖ、Ｍ ｏ ＳＣｄ等を含んでいてもよい。For this reason, it is preferable to use a material with a high content of Fe, for example, 60% or more. Further, the Vickers hardness (Hv) of the preferred material is 200 to 300. Fe-
The Zn alloy layer is made of a metal other than Fe and Zn, such as Mn, S
n, V, M o SCd, etc. may be included.
中間層は、純Ｚｎ、純Ａｌまたは純Ｃｕ等よりなるが、
鋼板よりも硬度の低いものであれば、いずれの金属また
は合金であってもよい。純Ｚｎが好ましい。The intermediate layer is made of pure Zn, pure Al, pure Cu, etc.
Any metal or alloy may be used as long as it has lower hardness than steel plate. Pure Zn is preferred.
耐食性金属層は、耐食性、謝礼あき性に優れたものであ
ればいずれの合金でもよく、例えば主としてＺｎからな
るＺｎ−Ｆｅ合金等が用いられる。 Ｈｖは好ましくは
９０ないし１００である。The corrosion-resistant metal layer may be made of any alloy as long as it has excellent corrosion resistance and corrosion resistance; for example, a Zn--Fe alloy mainly composed of Zn is used. Hv is preferably 90 to 100.
メッキは、所望により鋼板の表もしくは裏、またはその
両面に施され、両面に施す場合には各面のメッキのそれ
ぞれの層を構成する金属は同じでも異なっていてもよい
。Plating is applied to the front or back side of the steel sheet, or both sides thereof, if desired. When plating is applied to both sides, the metals constituting each layer of plating on each side may be the same or different.
各層のメッキは、従来方法により電気メツキ法、溶融メ
ッキ法、拡散メッキ法、蒸着メッキ法等いずれの方法に
より行なってもよい。また、各層のメッキはそれぞれ異
なるメッキ法により行なわれてもよい。Plating of each layer may be performed by any conventional method such as electroplating, hot-dip plating, diffusion plating, or vapor deposition plating. Furthermore, each layer may be plated by a different plating method.
さらに、本発明の表面処理鋼板は、カチオン電着等によ
る塗装の下地のほか、燐酸亜鉛・鉄系燐酸塩処理の下地
としても優れている。Furthermore, the surface-treated steel sheet of the present invention is excellent as a base for painting by cationic electrodeposition, etc., and also as a base for zinc phosphate/iron phosphate treatment.
（作用）
本発明の表面処理鋼板は、硬度の高いＦｅ−Ｚｎ合金層
と耐食性金属層との間に硬度の低い中間層を有するため
、チンピングにより塗膜が剥離した場合、硬度の高いＦ
ｅ−Ｚｎ合金層が一緒に剥離することはあっても、硬度
の低い中間層の緩衝作用により、メッキ層が鋼板との界
面で剥離することはなく、従って鋼板が剥き出しになる
ことはない。また、塗膜と接する側のＦｅ−Ｚｎ合金層
により塗膜密着性が達成され、鋼板と接する側の耐食性
合金層により耐食性、謝礼あき性及び耐チッピング性が
達成される。(Function) Since the surface-treated steel sheet of the present invention has a low hardness intermediate layer between the high hardness Fe-Zn alloy layer and the corrosion resistant metal layer, when the coating film peels off due to chimping, the high hardness F
Although the e-Zn alloy layer may peel off together, the plating layer will not peel off at the interface with the steel plate due to the buffering effect of the intermediate layer with low hardness, and therefore the steel plate will not be exposed. Further, the Fe-Zn alloy layer on the side in contact with the paint film achieves paint film adhesion, and the corrosion-resistant alloy layer on the side in contact with the steel plate achieves corrosion resistance, cracking resistance, and chipping resistance.
（実施例） 以下、実施例により本発明をさらに詳細に説明する。(Example) Hereinafter, the present invention will be explained in more detail with reference to Examples.
実施例：
第１図は、本実施例により製造される表面処理鋼板１を
示す。表面処理調板ｌは、鋼板２に、表面層としてのＦ
ｅ−Ｚｎ合金層５、中間層としての純Ｚｎ層４及び下層
としての耐食性合金層３からなるメッキ層が形成されて
いる。ｖｋ表面処理鋼板１は、鋼板２に、Ｚｎ８５％及
びＦｅ１５％からなる２０ｇ／ ｒｄの耐食性合金層３
．０〜６０ｇ／ｒｒｒの純Ｚｎ層４、Ｆｅ８０％及びＺ
ｎ２０％からなる３ｇ／ｒｄのＦｅ−Ｚｎ合金層５をこ
の順にメッキすることにより製造される。得られた表面
処理鋼板１は、メッキする純Ｚｎの量に応じて種々の厚
さの純Ｚｎ層を有する。得られた表面処理鋼板ｌにカチ
オン電着により厚さ２０μｍの塗膜６を施した。Example: FIG. 1 shows a surface-treated steel sheet 1 manufactured according to this example. The surface treatment plate 1 applies F as a surface layer to the steel plate 2.
A plating layer consisting of an e-Zn alloy layer 5, a pure Zn layer 4 as an intermediate layer, and a corrosion-resistant alloy layer 3 as a lower layer is formed. The vk surface-treated steel sheet 1 includes a steel sheet 2 and a 20 g/rd corrosion-resistant alloy layer 3 consisting of 85% Zn and 15% Fe.
．． Pure Zn layer 4 of 0 to 60 g/rrr, 80% Fe and Z
It is manufactured by plating a 3 g/rd Fe--Zn alloy layer 5 consisting of 20% n in this order. The obtained surface-treated steel sheet 1 has pure Zn layers of various thicknesses depending on the amount of pure Zn to be plated. A coating film 6 with a thickness of 20 μm was applied to the obtained surface-treated steel sheet 1 by cationic electrodeposition.
試験例：
上記で得られた表面処理鋼板１にチッピングを与えたと
ころ、第３図に示すように、その殆どが塗膜６とＦｅ−
Ｚｎ合金層５との間の界面ＣまたはＦｅ−Ｚｎ合金１５
と純Ｚｎ層４との間の界面Ｂで剥離し、界面Ａで剥離す
ることはなかった。また、これらのチッピングを生じた
表面処理鋼板１′に塩水噴霧試験を行ない、その結果を
第４図のグラフに示した。グラフの横軸は中間層として
のＺｎメッキ量を表わし、縦軸は赤錆が発生するまでの
時間を示す。グラフより明らかなようにＺｎメッキ量を
増すほど、赤錆の発生が抑制される。Test example: When chipping was applied to the surface-treated steel sheet 1 obtained above, most of the chipping was caused by the coating film 6 and the Fe-
Interface C between Zn alloy layer 5 or Fe-Zn alloy 15
Peeling occurred at the interface B between the Zn layer and the pure Zn layer 4, but no peeling occurred at the interface A. In addition, a salt spray test was conducted on the surface-treated steel sheet 1' in which chipping occurred, and the results are shown in the graph of FIG. The horizontal axis of the graph represents the amount of Zn plating as an intermediate layer, and the vertical axis represents the time until red rust occurs. As is clear from the graph, as the amount of Zn plating increases, the occurrence of red rust is suppressed.
（発明の効果）
本発明の表面処理ｗ４仮には、塗膜密着性の良好なＦｅ
−Ｚｎ合金層と耐食性合金層との間に鋼板に比べて硬度
の低い中間層を有するメッキ層が形成されている。従っ
て、該表面処理鋼板に形成された塗膜がチッピングによ
り剥離するような場合でも、上記の中間層の緩衝作用が
働くためメッキ全体が剥離して鋼板２が剥き出しになる
ことはない。また、Ｆｅ−Ｚｎ合金層及び耐食性合金層
により、塗膜密着性、謝礼あき性、耐腐食性が得られる
。(Effect of the invention) The surface treatment w4 of the present invention is based on Fe, which has good coating film adhesion.
- A plated layer having an intermediate layer having a lower hardness than the steel plate is formed between the Zn alloy layer and the corrosion-resistant alloy layer. Therefore, even if the coating film formed on the surface-treated steel sheet peels off due to chipping, the buffering effect of the intermediate layer acts so that the entire plating will not peel off and the steel sheet 2 will not be exposed. Further, the Fe-Zn alloy layer and the corrosion-resistant alloy layer provide good coating film adhesion, scratch resistance, and corrosion resistance.
従って、本発明の表面処理鋼板を使用することにより、
長期の使用の際に腐食、赤錆等を生じることがなく、ま
たカチオン電着等を施す際に塗膜欠陥を生じることがな
く、しかもチッピングに起因する赤錆を生じることのな
い塗装品を得ることができる。Therefore, by using the surface-treated steel sheet of the present invention,
To obtain a coated product that does not cause corrosion, red rust, etc. during long-term use, does not cause paint film defects when applying cationic electrodeposition, etc., and does not generate red rust due to chipping. I can do it.
第１図は本発明の一実施例の表面処理鋼板を示す断面図
、第２図は従来例の表面処理鋼板をチッピングした後に
塩水噴霧処理した状態を示す図、第３図は第１図の表面
処理鋼板をチッピングした後に塩水噴霧処理した状態を
示す図、第４図は試験例の結果を示すグラフである。FIG. 1 is a cross-sectional view showing a surface-treated steel sheet according to an embodiment of the present invention, FIG. 2 is a view showing a conventional surface-treated steel sheet subjected to salt spray treatment after chipping, and FIG. 3 is a cross-sectional view of the surface-treated steel sheet of FIG. FIG. 4 is a graph showing the results of a test example.
Claims (1)
たは合金からなる下層の３層よりなるメッキが施されて
いることを特徴とする表面処理鋼板。[Claims] The invention is characterized by being plated with three layers: a surface layer made of an Fe-Zn alloy, an intermediate layer made of pure Zn, pure Al, or pure Cu, and a lower layer made of a corrosion-resistant metal or alloy. surface-treated steel sheet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29188786A JPS63145792A (en) | 1986-12-08 | 1986-12-08 | Surface treated steel sheet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29188786A JPS63145792A (en) | 1986-12-08 | 1986-12-08 | Surface treated steel sheet |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63145792A true JPS63145792A (en) | 1988-06-17 |
Family
ID=17774734
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP29188786A Pending JPS63145792A (en) | 1986-12-08 | 1986-12-08 | Surface treated steel sheet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63145792A (en) |
-
1986
- 1986-12-08 JP JP29188786A patent/JPS63145792A/en active Pending
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