JPH0813161A - Three layer-coated steel having high corrosion resistance and heat resistance - Google Patents
Three layer-coated steel having high corrosion resistance and heat resistanceInfo
- Publication number
- JPH0813161A JPH0813161A JP14353394A JP14353394A JPH0813161A JP H0813161 A JPH0813161 A JP H0813161A JP 14353394 A JP14353394 A JP 14353394A JP 14353394 A JP14353394 A JP 14353394A JP H0813161 A JPH0813161 A JP H0813161A
- Authority
- JP
- Japan
- Prior art keywords
- layer
- alloy
- plating
- corrosion resistance
- heat resistance
- 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
Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
- C23C28/02—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings only including layers of metallic material
- C23C28/021—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings only including layers of metallic material including at least one metal alloy layer
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
- C23C28/02—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings only including layers of metallic material
- C23C28/023—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings only including layers of metallic material only coatings of metal elements only
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chemical Treatment Of Metals (AREA)
- Other Surface Treatments For Metallic Materials (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、鋼材表面に被覆する電
気めっき層に係るものであり、さらに詳細には自動車用
配管部品の耐食性、耐熱性を図るための電気めっき処理
に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electroplating layer coated on the surface of a steel material, and more particularly to an electroplating treatment for improving corrosion resistance and heat resistance of automobile piping parts.
【０００２】[0002]
【従来の技術】近年、自動車部品の防錆性能については
年々高いものが要求されるようになっており、特に北米
の塩害地区に代表されるようにその規制は厳しさを増し
ている。また、エンジンルーム内のろう付けを伴う配管
部品についてはさらに高レベルの耐熱性が求められてい
る。そこで、高耐食性と耐熱性の双方に優れた性質を備
えた表面処理を施した鋼材の開発が望まれている。2. Description of the Related Art In recent years, the anticorrosion performance of automobile parts has been required to be higher year by year, and the regulation thereof is becoming more strict as represented by salt damage areas in North America. In addition, a higher level of heat resistance is required for piping parts associated with brazing in the engine room. Therefore, it is desired to develop a surface-treated steel material having excellent properties of both high corrosion resistance and heat resistance.
【０００３】従来、板、管、棒あるいは線等の鉄鋼材の
表面に被覆層を設ける技術としては、例えば特公昭５５
−１８７９４号公報に記載のものがある。この技術は、
鉄鋼材の表面にＳｎ基−Ｚｎ合金の電気めっき層を設
け、次いでＺｎ電気メッキ層を形成し、更にこの層上に
クロメート処理を施した被覆鋼材である。このような重
合電気めっき処理鋼材は、耐食性材料として実用化され
てはいるが、塩害地使用の製品めっき処理としてはまだ
充分な耐食性を有するものではない。また、この鋼材
は、Ｚｎ電気めっきした層上にクロメート被膜を有して
いるので熱劣化し易い傾向がある。Conventionally, as a technique for forming a coating layer on the surface of a steel material such as a plate, a pipe, a rod or a wire, for example, Japanese Patent Publication No. 55
No. 18794. This technology
This is a coated steel material in which an Sn-based Zn alloy electroplating layer is provided on the surface of a steel material, a Zn electroplating layer is then formed, and chromate treatment is further applied to this layer. Although such a polymerized electroplated steel material has been put into practical use as a corrosion resistant material, it does not yet have sufficient corrosion resistance as a product plating treatment for use in salt-damaged areas. Further, since this steel material has a chromate film on the Zn electroplated layer, it tends to be thermally deteriorated.
【０００４】[0004]
【発明が解決しようとする課題】本発明は、上述した従
来技術を改善したものであって、耐食性及び耐熱性に優
れた電気めっき処理を施した鋼材を提供することを目的
としている。SUMMARY OF THE INVENTION The present invention is an improvement of the above-mentioned conventional technique, and an object of the present invention is to provide an electroplated steel material having excellent corrosion resistance and heat resistance.
【０００５】[0005]
【課題を解決するための手段】本発明者は、Ｚｎ電気め
っきのようなイオン化傾向の卑な金属を中間層に位置さ
せ、その上層に高耐食性のＺｎ−Ｎｉ合金層を設けるこ
とによりその層の腐食が遅行すると共に、鋼材素地の腐
食が妨げられることを知見した。また、本発明者は、最
上層にＺｎ−Ｎｉ合金電気めっき表面にクロメート処理
した被膜を設けることにより著しく耐熱性が向上するこ
とを知見したのである。The present inventor has found that a base metal having an ionization tendency such as Zn electroplating is located in an intermediate layer, and a Zn-Ni alloy layer having high corrosion resistance is provided on the intermediate layer. It has been found that the corrosion of steel is delayed and the corrosion of the steel substrate is hindered. The present inventor has also found that the heat resistance is remarkably improved by providing a chromate-treated coating on the surface of the Zn-Ni alloy electroplating layer as the uppermost layer.
【０００６】本発明は、前述したこれらの知見に基づい
てなされたものであって、下記の事項をその特徴として
いる。鉄鋼材の表面に第１層としてＳｎ−Ｚｎ合金の電
気めっき、第２層としてＺｎ電気めっき、また第３層と
してＺｎ−Ｎｉ合金電気めっきを施し、さらに最上層に
クロメート処理したことを特徴とする、高耐食性、耐熱
性三層被覆鋼材。The present invention has been made on the basis of these findings described above, and is characterized by the following matters. It is characterized in that the surface of a steel material is electroplated with a Sn—Zn alloy as a first layer, Zn electroplated as a second layer, Zn—Ni alloy electroplated as a third layer, and chromate-treated on the uppermost layer. Highly corrosion resistant and heat resistant three-layer coated steel.
【０００７】以下に、本発明を詳細に説明する。まず、
本発明の三層被覆鋼材の被覆の構成およびその厚さにつ
いて、図１に基づいて述べる。第一層は、鋼材の素管表
面に設けられたＳｎ−Ｚｎ合金からなり、延性に優れて
おり、曲げ加工部の耐食性の低下が少ない。好適な厚さ
の範囲は、４〜６μｍである。The present invention will be described in detail below. First,
The structure and thickness of the coating of the three-layer coated steel material of the present invention will be described with reference to FIG. The first layer is made of a Sn—Zn alloy provided on the surface of the steel raw pipe, has excellent ductility, and has little deterioration in corrosion resistance of the bent portion. The preferred thickness range is 4-6 μm.
【０００８】第二層は、厚みが５〜１０μｍからなるＺ
ｎ層である。第一層のＳｎ−Ｚｎ合金めっきに比較して
イオン化傾向が卑であるのでＳｎ−Ｚｎ合金めっきを保
護する犠牲腐食が生じる。第三層は、４〜６μｍ厚さの
Ｚｎ−Ｎｉ合金層からなる本発明の主要なめっき層であ
り、クロメート処理した皮膜は耐熱性に優れている。Ｚ
ｎとＮｉの合金比率としては、９４：６が好ましい。The second layer is made of Z having a thickness of 5 to 10 μm.
It is an n-layer. Since the ionization tendency is less than that of the Sn-Zn alloy plating of the first layer, sacrificial corrosion that protects the Sn-Zn alloy plating occurs. The third layer is the main plating layer of the present invention composed of a Zn—Ni alloy layer having a thickness of 4 to 6 μm, and the chromate-treated coating has excellent heat resistance. Z
The alloy ratio of n and Ni is preferably 94: 6.
【０００９】[0009]
【実施例】以下に、本発明を実施例によりさらに説明す
る。材質ＳＰＣＣ、外径８ｍｍ、肉厚０．７ｍｍ、長さ
５００ｍｍの鋼管材５本を常法により清浄化し、清浄化
して得られた鋼管材の表面にＳｎ−Ｚｎ合金の電気めっ
き、Ｚｎ電気めっき、Ｚｎ−Ｎｉ合金電気めっきを順々
に施すと共に、さらにクロメート処理を施した重合めっ
き層を形成し、各管共両端を切除して長さ３００ｍｍの
もの５本を得て本発明例の試料とした。EXAMPLES The present invention will be further described below with reference to examples. The material of SPCC, the outer diameter of 8 mm, the wall thickness of 0.7 mm, and the length of 500 mm are cleaned by five steel pipe materials by a conventional method, and the surface of the obtained steel pipe material is electroplated with Sn-Zn alloy and Zn electroplating. , Zn-Ni alloy electroplating was sequentially performed, and further a chromate-treated polymerized plating layer was formed, and both ends of each tube were cut off to obtain 5 pieces each having a length of 300 mm to obtain a sample of the present invention sample. And
【００１０】次に、各めっき層の形成方法について述べ
る。各めっき層の厚さは、表１に示す通りである。 Ｓｎ−Ｚｎ合金めっき層：めっき浴中の金属成分Ｓｎ
３０ｇ／ｌ、Ｚｎ ２．５ｇ／ｌからなるアルカリ系め
っき液を使用し、前記の清浄化処理された鋼管材を陰極
とし、液温を６５℃に保持し、陰極電流密度２Ａ／ｄｍ
2 で通電して、Ｓｎ−Ｚｎ合金めっきを鋼管材の表面に
形成した。Next, a method of forming each plating layer will be described. The thickness of each plating layer is as shown in Table 1. Sn-Zn alloy plating layer: metal component Sn in the plating bath
An alkaline plating solution consisting of 30 g / l and Zn 2.5 g / l was used, the cleaned steel pipe material was used as a cathode, the solution temperature was maintained at 65 ° C., and the cathode current density was 2 A / dm.
By energizing at 2 , Sn-Zn alloy plating was formed on the surface of the steel pipe material.
【００１１】Ｚｎめっき層：めっき浴中の金属成分Ｚｎ
２０ｇ／ｌからなるアルカリ系めっき液を使用し、前
記Ｓｎ−Ｚｎ合金めっきを施した鋼管材を陰極とし、液
温を２５℃に保持し、陰極電流密度３Ａ／ｄｍ2 で通電
して、Ｚｎめっきを形成した。Zn plating layer: metal component Zn in the plating bath
Using an alkaline plating solution consisting of 20 g / l, the steel tube material plated with the Sn-Zn alloy was used as a cathode, the solution temperature was maintained at 25 ° C, and current was applied at a cathode current density of 3 A / dm 2 to obtain Zn. The plating was formed.
【００１２】Ｚｎ−Ｎｉ合金めっき層：めっき浴中の金
属成分がＺｎ ８．５ｇ／ｌおよびＮｉ １．８ｇ／ｌ
からなるアルカリ系めっき液を使用し、前記Ｓｎ−Ｚｎ
合金めっき、およびＺｎめっきした鋼管材を陰極とし、
液温を２５℃に保持し、陰極電流密度を３Ａ／ｄｍ2 で
通電して、Ｚｎ−Ｎｉ合金めっきを形成した。Zn-Ni alloy plating layer: The metal components in the plating bath are Zn 8.5 g / l and Ni 1.8 g / l.
The alkaline plating solution consisting of
Alloy-plated and Zn-plated steel pipe material as the cathode,
The liquid temperature was maintained at 25 ° C., and the cathode current density was 3 A / dm 2 to energize to form a Zn—Ni alloy plating.
【００１３】クロメート処理：前記の最上層にＺｎ−Ｎ
ｉ合金めっきとして得られた重合めっき鋼管は、クロメ
ート浴（ジャスコ社、ＺＮＣ−９８０）中に常温にて浸
漬後取り出し水洗、乾燥した。Chromate treatment: Zn-N on the uppermost layer
The polymerized steel tube obtained as the i alloy plating was immersed in a chromate bath (JNC, ZNC-980) at room temperature, taken out, washed with water and dried.
【００１４】[0014]
【表１】 [Table 1]
【００１５】本発明例と対比するため、比較例として、
表２に示すような試料を下記の要領で作成した。材質Ｓ
ＰＣＣの外径８ｍｍ、肉厚０．７ｍｍ、長さ５００ｍｍ
の鋼管材の表面に、Ｓｎ−Ｚｎ合金めっきおよびＺｎめ
っきを、順次前述した要領で形成し、クロメート浴（ジ
ャスコ社 ＭＣ３５２）中に常温にて浸漬後取り出して
水洗乾燥して、重合めっき鋼管５本を得た。For comparison with the examples of the present invention, as comparative examples,
The samples shown in Table 2 were prepared in the following manner. Material S
PCC outer diameter 8 mm, wall thickness 0.7 mm, length 500 mm
The Sn-Zn alloy plating and the Zn plating were sequentially formed on the surface of the steel pipe material of No. 1 in the same manner as described above, immersed in a chromate bath (Jusco MC352) at room temperature, taken out, washed with water and dried to form the polymerized steel pipe 5 I got a book.
【００１６】本発明例および比較例の各試料について３
５℃塩水噴霧、６０℃熱風乾燥、湿潤（５０℃、湿度９
５％以上）を組合せた複合サイクル試験を行った。この
試験は、塩水噴霧、熱風乾燥、湿潤を５０％、２５％、
２５％で組合せ、１サイクル８時間で実施した。試験に
先立ち、各試料に１２０℃×２４時間の加熱ダメージを
与えた。複合サイクル試験の結果を、表２に示す。3 for each sample of the present invention and comparative examples
5 ℃ salt water spray, 60 ℃ hot air drying, wet (50 ℃, humidity 9
5% or more) was performed to perform a combined cycle test. This test is salt spray, hot air dry, wet 50%, 25%,
Combined at 25% and performed for 1 cycle 8 hours. Prior to the test, each sample was heat-damaged at 120 ° C. for 24 hours. The results of the combined cycle test are shown in Table 2.
【００１７】[0017]
【表２】 [Table 2]
【００１８】表２から分るように、本発明のめっき処理
した鋼材は２４０サイクルで赤錆斑点が発生するのに対
し、比較例材のものは６０サイクルで赤錆斑点が発生す
る。このことから、本発明のめっきは、従来のものに比
べ、耐食性および耐熱性が著しく優れていることが明ら
かとなった。As can be seen from Table 2, the plated steel material of the present invention causes red rust spots at 240 cycles, whereas the comparative example material causes red rust spots at 60 cycles. From this, it is clear that the plating of the present invention is significantly superior in corrosion resistance and heat resistance to the conventional one.
【図１】本発明の三層被覆鋼材の構成を示す説明図であ
る。FIG. 1 is an explanatory view showing a constitution of a three-layer coated steel material of the present invention.
Claims (1)
金の電気めっき、第２層としてＺｎ電気めっき、また第
３層としてＺｎ−Ｎｉ合金電気めっきを施し、さらに最
上層にクロメート処理したことを特徴とする、高耐食
性、耐熱性三層被覆鋼材。1. A surface of a steel material is electroplated with a Sn--Zn alloy as a first layer, Zn electroplating as a second layer, and Zn--Ni alloy electroplating as a third layer, and a chromate treatment is applied to the uppermost layer. A high corrosion resistance, heat resistant three-layer coated steel material characterized by the above.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14353394A JPH0813161A (en) | 1994-06-24 | 1994-06-24 | Three layer-coated steel having high corrosion resistance and heat resistance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14353394A JPH0813161A (en) | 1994-06-24 | 1994-06-24 | Three layer-coated steel having high corrosion resistance and heat resistance |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0813161A true JPH0813161A (en) | 1996-01-16 |
Family
ID=15340963
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14353394A Pending JPH0813161A (en) | 1994-06-24 | 1994-06-24 | Three layer-coated steel having high corrosion resistance and heat resistance |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0813161A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19813641A1 (en) * | 1998-03-27 | 1999-09-30 | Schaeffler Waelzlager Ohg | Hydraulically operated disengaging device for friction clutch of vehicle |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5518794A (en) * | 1979-03-29 | 1980-02-09 | Sanyo Jido Hanbaiki Kk | Method of detecting failure of automatic vending machine |
| JPS619596A (en) * | 1984-06-22 | 1986-01-17 | Sumitomo Metal Ind Ltd | Multilayer electrolytically plated steel sheet |
-
1994
- 1994-06-24 JP JP14353394A patent/JPH0813161A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5518794A (en) * | 1979-03-29 | 1980-02-09 | Sanyo Jido Hanbaiki Kk | Method of detecting failure of automatic vending machine |
| JPS619596A (en) * | 1984-06-22 | 1986-01-17 | Sumitomo Metal Ind Ltd | Multilayer electrolytically plated steel sheet |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19813641A1 (en) * | 1998-03-27 | 1999-09-30 | Schaeffler Waelzlager Ohg | Hydraulically operated disengaging device for friction clutch of vehicle |
| DE19813641B4 (en) * | 1998-03-27 | 2009-02-26 | Luk Lamellen Und Kupplungsbau Beteiligungs Kg | Hydraulically actuated disengaging device |
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