JP3066458B2 - Alloyed hot-dip galvanized steel sheet with excellent impact adhesion - Google Patents
Alloyed hot-dip galvanized steel sheet with excellent impact adhesionInfo
- Publication number
- JP3066458B2 JP3066458B2 JP4243125A JP24312592A JP3066458B2 JP 3066458 B2 JP3066458 B2 JP 3066458B2 JP 4243125 A JP4243125 A JP 4243125A JP 24312592 A JP24312592 A JP 24312592A JP 3066458 B2 JP3066458 B2 JP 3066458B2
- Authority
- JP
- Japan
- Prior art keywords
- steel sheet
- dip galvanized
- galvanized steel
- alloyed hot
- plating layer
- 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.)
- Expired - Lifetime
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- Coating With Molten Metal (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、耐衝撃密着性にすぐ
れ、特に、自動車外板や塗装下地用途に好適である合金
化溶融亜鉛めつき鋼板に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an alloyed hot-dip galvanized steel sheet which has excellent impact adhesion and is particularly suitable for use in automobile outer panels and undercoating applications.
【０００２】[0002]
【従来の技術】合金化溶融亜鉛めつき鋼板は、従来、そ
のすぐれた耐食性及び塗装性のために、種々の用途に広
く用いられている。例えば、自動車のドア、フードのア
ウター等の外板には、Ｆｅ−Ｚｎ電気めつきを数ｇ／m2
施した合金化溶融亜鉛めつき鋼板が実用化されている。
しかし、合金化溶融亜鉛めつき鋼板を自動車用外板とし
て用いるときは、走行時に受けがちな飛び石等によるチ
ツピング衝撃によつて塗膜の剥離と同時にめつき被膜の
剥離までを生じやすい。チツピング現象によつてめつき
が剥離した箇所は赤錆が生じやすく、自動車外板として
の用途には致命的な問題である。2. Description of the Related Art Alloyed hot-dip galvanized steel sheets have been widely used in various applications because of their excellent corrosion resistance and paintability. For example, an outer plate such as an automobile door or an outer hood has an electric plating of Fe-Zn of several g / m 2.
An alloyed hot-dip galvanized steel sheet has been put to practical use.
However, when the alloyed hot-dip galvanized steel sheet is used as an outer panel for an automobile, the coating film tends to peel off simultaneously with the peeling of the coating film due to the chipping impact of stepping stones and the like, which are likely to be received during traveling. Red rust is apt to occur in the area where the adhesion is peeled off due to the chipping phenomenon, which is a fatal problem for use as an automobile outer panel.
【０００３】また、合金化溶融亜鉛めつき鋼板は、プレ
コート鋼板の原板として用いられることが多い。しか
し、合金化溶融亜鉛めつき鋼板を原板としたプレコート
鋼板に切断、打抜き等の加工を加えたとき、切断部端面
において塗膜の剥離を生じることがある。この塗膜の剥
離は、めつき層内で生じており、重大な問題である。[0003] Further, an alloyed hot-dip galvanized steel sheet is often used as an original sheet of a precoated steel sheet. However, when processing such as cutting and punching is applied to a pre-coated steel sheet using an alloyed hot-dip galvanized steel sheet as a base sheet, peeling of the coating film may occur on the end face of the cut part. This peeling of the coating film occurs in the plating layer and is a serious problem.
【０００４】[0004]
【発明が解決しようとする課題】本発明は、上述したよ
うに、自動車の車体外板やプレコート鋼板の原板として
合金化溶融亜鉛めつき鋼板を用いたときに伴なわれる種
々の問題を解決するためになされたものであつて、チツ
ピング、切断、打抜き等において、めつき密着性、即
ち、耐衝撃密着性にすぐれる合金化溶融亜鉛めつき鋼板
を提供することを目的とする。SUMMARY OF THE INVENTION As described above, the present invention solves various problems associated with the use of an alloyed hot-dip galvanized steel sheet as an outer plate of an automobile body or a precoated steel sheet. It is an object of the present invention to provide an alloyed hot-dip galvanized steel sheet having excellent plating adhesion, that is, impact resistance in chipping, cutting, and punching.
【０００５】[0005]
【課題を解決するための手段】本発明によれば、中心線
平均粗さ0.６〜1.５μｍを有する被めつき材の片面又は
両面に２０〜１００ｇ／m 2 のめつき付着量を有する合金
化溶融亜鉛めつき鋼板において、めつき層の平均Ｆｅ含
有率が８〜１６％であり、めつき層中のΓ相の厚さが0.
２〜1.５μｍであることを特徴とする耐衝撃密着性にす
ぐれる合金化溶融亜鉛めつき鋼板が提供される。 According to the present invention, a center line is provided.
One side of the covering material having an average roughness of 0.6 to 1.5 μm or
In an alloyed hot-dip galvanized steel sheet having a plating adhesion amount of 20 to 100 g / m 2 on both sides, the average Fe content of the plating layer is 8 to 16%, and the thickness of the Γ phase in the plating layer Is 0.
2 to 1.5 μm .
A rolled alloyed hot-dip galvanized steel sheet is provided .
【０００６】本発明において、めつき層の耐衝撃密着性
は、次のようにして評価される。即ち、ＡＳＴＭ Ｄ−
３１７０−７４に規定されている耐衝撃密着性試験に準
じて、７０×１５０mmの鋼板試験片に自動車用３コート
仕上（全膜厚９０μｍ）を施し、得られた塗装鋼板につ
いて、常温でグラベロチツピング試験を行なつて、その
結果を４段階評価する。４はめつき層の耐衝撃密着性が
すぐれており、めつき層の剥離がない、３はめつき層の
剥離面積率が0.２％未満である、２はめつき層の剥離面
積率が0.２％以上、１％未満である、１はめつき層の剥
離面積率が１％以上である、を示す。In the present invention, the impact adhesion of the plating layer is evaluated as follows. That is, ASTM D-
According to the impact adhesion test specified in 3170-74, a steel sheet test piece of 70 × 150 mm was subjected to a 3-coat finish for automobiles (total film thickness of 90 μm), and the obtained coated steel sheet was subjected to gravure at room temperature. A chipping test is performed and the results are evaluated on a 4-point scale. (4) The impact adhesion of the plating layer is excellent, and there is no peeling of the plating layer. (3) The peeling area ratio of the plating layer is less than 0.2%. (2) The peeling area ratio of the plating layer is 0.2%. 2% or more and less than 1% 1 indicates that the peeling area ratio of the plating layer is 1% or more.
【０００７】本発明によれば、上述したように、めつき
層の平均Ｆｅ含有率とめつき層中のΓ相の厚さとを規定
することによつて、合金化溶融亜鉛めつきの耐衝撃密着
性を改善することができる。更に、本発明によれば、め
つき前の被めつき材は、中心線平均粗さ（Ｒａ）0.６〜
1.５μｍを有する。被めつき材のＲａは、ＪＩＳ Ｒ０
６０１−１９７０に規定されている。即ち、被測定物質
をスキヤンして得られた粗さ曲線から、その中心線の方
向に測定長さ（Ｌ）の部分を抜取り、この抜取り部分の
中心線をｘ軸、これと直交する方向をｙ軸とし、上記粗
さ曲線をｙ＝ｆ（ｘ）とするとき、Ｒａは次式According to the present invention, as described above, by defining the average Fe content of the plating layer and the thickness of the Γ phase in the plating layer, the impact adhesion resistance of the alloyed molten zinc plating is determined. Can be improved. Furthermore, according to the present invention, the coated material before plating has a center line average roughness (Ra) of 0.6 to 0.6.
1.5 μm . Ra of the covering material is JIS R0
601-1970. That is, a portion of the measured length (L) is extracted in the direction of the center line from the roughness curve obtained by scanning the substance to be measured, the center line of the extracted portion is defined as the x-axis, and the direction orthogonal to the x-axis is defined as When the y-axis is set and the roughness curve is set to y = f (x), Ra is expressed by the following equation.
【０００８】[0008]
【数１】 (Equation 1)
【０００９】で与えられる。先ず、被めつき材のＲａと
めつきの耐衝撃密着性との関係については、図１に示す
ように、被めつき材のＲａが0.６μｍ以上であるとき
に、めつきの耐衝撃密着性がすぐれる。その理由は必ず
しも明らかではないが、被めつき材のＲａが0.６μｍ以
上になるとき、めつき層と被めつき材との界面に微小な
凹凸が生じ、アンカー効果によつて、めつきの耐衝撃密
着性が良好となるとみられる。しかし、被めつき材のＲ
ａが1.５を越えるときは、塗装後の鮮映性が悪くなる。[0009] First, regarding the relationship between Ra of the adhered material and the impact resistance of the adhered material, as shown in FIG. 1, when Ra of the adhered material is 0.6 μm or more, the impact resistance of the adhered material is reduced. It excels. Although the reason is not necessarily clear, when Ra of the covering material is 0.6 μm or more, minute irregularities are generated at the interface between the covering layer and the covering material, and the plating effect is caused by the anchor effect. It is expected that the impact adhesion will be good. However, the R
When a exceeds 1.5, the sharpness after painting deteriorates.
【００１０】次に、合金化溶融亜鉛めつき層のΓ相とめ
つき相の耐衝撃密着性との関係については、図２に光学
顕微鏡にて測定した合金化溶融亜鉛めつき層のΓ相の厚
さとめつき層の耐衝撃密着性との関係を示すように、め
つき層のΓ相の厚さが0.２〜1.５μｍの範囲において、
めつき層の耐衝撃密着性がすぐれることが示される。め
つき層のΓ相の厚さが0.２μｍ以上で耐衝撃密着性がす
ぐれる理由は必ずしも明らかではないが、Γ相が厚くな
れば、めつき層が衝撃を受けたときに生じるクラツクの
伝播がΓ相の箇所で妨害されるためであると考えられ
る。但し、Γ相の厚さが1.５μｍ以上になるときは、め
つき層が脆くなり、その耐衝撃密着性が劣化する。FIG. 2 shows the relationship between the Δ phase of the alloyed hot-dip galvanized layer and the impact adhesion of the plated phase, as shown in FIG. As shown in the relationship between the thickness and the impact adhesion of the plating layer, when the thickness of the Γ phase of the plating layer is in the range of 0.2 to 1.5 μm,
This shows that the impact resistance of the plating layer is excellent. The reason why the adhesion resistance is excellent when the thickness of the Γ phase of the plating layer is 0.2 μm or more is not necessarily clear. However, as the Γ phase becomes thicker, the cracks generated when the plating layer is subjected to an impact can be reduced. It is considered that the propagation is obstructed at the point of phase Γ. However, when the thickness of the Γ phase is 1.5 μm or more, the plating layer becomes brittle, and its impact resistance deteriorates.
【００１１】本発明においては、めつき層中のＦｅ含有
率は８〜１６％の範囲であることが必要である。Ｆｅ含
有率が８％よりも少ないときは、Γ相の厚さが薄く、耐
衝撃密着性の改善に至らない。しかし、Ｆｅ含有率が１
６％を越えるときは、Γ相が厚くなりすぎて、プレス成
形時にめつき被膜が剥離する所謂パウダリング現象が起
こる。In the present invention, the Fe content in the plating layer must be in the range of 8 to 16%. When the Fe content is less than 8%, the thickness of the Γ phase is too small to improve the impact adhesion. However, when the Fe content is 1
If it exceeds 6%, the so-called powdering phenomenon in which the Δ phase becomes too thick and the coating film peels off during press molding occurs.
【００１２】更に、本発明によれば、合金化溶融亜鉛め
つき層の上にＦｅ６０％以上、残部Ｚｎからなる電気め
つき層を施して二層めつき鋼板を得ることができる。か
かる二層めつき鋼板は、カチオン電着塗装性やプレス成
形性にすぐれており、カチオン電着塗装時のクレーター
状の塗膜欠陥の発生を防止し、また、難成形部での加工
が可能となる。この上層めつき層のＦｅ量が６０％より
も少ないときは、カチオン電着塗装性やプレス成形性等
の改善効果が少ない。このような上層めつき層における
Ｆｅ量の上限は、通常、９９％である。Further, according to the present invention, a double-coated steel sheet can be obtained by applying an electric plating layer comprising at least 60% Fe and the balance of Zn on the alloyed molten zinc plating layer. This double-layered steel sheet is excellent in cationic electrodeposition coating and press formability, prevents the occurrence of crater-like coating defects during cationic electrodeposition coating, and enables processing in difficult-to-form parts. Becomes When the amount of Fe in the upper coating layer is less than 60%, the effect of improving the cationic electrodeposition coatability and press formability is small. The upper limit of the amount of Fe in such an upper plating layer is usually 99%.
【００１３】また、上層めつき付着量は１〜１０ｇ／m2
が適当である。上層めつき付着量が１ｇ／m2よりも少な
いときは、上層が均一に下層ＧＡを被覆しないので、カ
チオン電着塗装性やプレス成形性の改善効果が少ない。
しかし、１０ｇ／m2を越えるときは、耐食性やパウダリ
ング性が悪くなる。更に、本発明においては、上層にＮ
ｉ、Ｃｒ、Ａｌ、Ｐ、Ｃｕ、Ｃｏ、Ｃｄ等を含有させる
こともできる。The amount of adhesion of the upper layer is 1 to 10 g / m 2.
Is appropriate. When the adhesion amount of the upper layer is less than 1 g / m 2 , since the upper layer does not uniformly cover the lower layer GA, the effect of improving the cationic electrodeposition coating property and press moldability is small.
However, when it exceeds 10 g / m 2 , the corrosion resistance and the powdering property deteriorate. Further, in the present invention, N
i, Cr, Al, P, Cu, Co, Cd and the like can be contained.
【００１４】[0014]
【実施例】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。供試合金化溶融亜鉛めつき鋼板の被めつき材のＲ
ａ、めつき付着量、めつき層組成、めつき層のΓ層の厚
さ及びめつき層の耐衝撃密着性を表１に示す。EXAMPLES The present invention will be described below with reference to examples.
The present invention is not limited by these examples. R of the material to be coated on the hot-dip galvanized steel sheet
Table 1 shows a, the adhesion amount, the composition of the plating layer, the thickness of the layer Γ, and the impact resistance of the plating layer.
【００１５】耐チツピング性は、前述したＡＳＴＭ Ｄ
−３１７０７４に規定される耐衝撃密着性試験に準じ
て、めつきの剥離面積に応じて、４段階評価とした。合
金化溶融亜鉛めつきを原板としたプレコート鋼板の打抜
き性は、供試材にリン酸塩処理を施した後、ポリエステ
ル系塗料を塗布し、円形打抜きを行ない、打抜き孔周辺
のテーピングによる塗膜剥離面積によつて評価した。但
し、ポンチ径１４mm、クリアランス0.１５mm、塗膜質さ
２０μｍとした。評価は、４は塗膜の剥離面積が0.５mm
2 未満、３は塗膜の剥離面積が0.５mm2 以上、1.２mm2
未満、２は塗膜の剥離面積が1.２mm2 以上、2.０mm2 未
満、１は塗膜の剥離面積が2.０mm2 以上とした。The chipping resistance is as described in ASTM D
According to the impact adhesion test specified in -317074, a four-step evaluation was performed according to the peeled area of the plating. The punching property of pre-coated steel sheet with alloyed hot-dip galvanized plate is as follows: After subjecting the test material to phosphate treatment, apply a polyester coating, perform circular punching, and taping around the punched hole Evaluation was made based on the peeled area. However, the punch diameter was 14 mm, the clearance was 0.15 mm, and the coating quality was 20 μm. In the evaluation, 4 indicates that the peeling area of the coating film is 0.5 mm.
Less than 2 and 3 indicate that the peeling area of the coating film is 0.5 mm 2 or more and 1.2 mm 2
Less than 2, the peeling area of the coating was 1.2 mm 2 or more, less than 2.0 mm 2 , and 1 was the peeling area of the coating 2.0 mm 2 or more.
【００１６】[0016]
【表１】 [Table 1]
【００１７】表１において、試料１〜１０が本発明によ
る合金化溶融亜鉛めつき鋼板であり、他は比較材であ
る。本発明によるめつき鋼板は、被めつき材のＲａ、め
つき層のΓ相の厚さ及びＦｅ含有率が本発明で規定する
範囲内にあり、かくして、比較材に比べて、めつきの耐
衝撃密着性にすぐれている。In Table 1, Samples 1 to 10 are alloyed hot-dip galvanized steel sheets according to the present invention, and others are comparative materials. The plated steel sheet according to the present invention has the Ra of the coated material, the thickness of the Γ phase of the plated layer, and the Fe content within the ranges specified in the present invention, and thus has a higher resistance to plating than the comparative material. Excellent impact adhesion.
【００１８】[0018]
【発明の効果】以上のように、本発明によれば、中心線
平均粗さ0.６〜1.５μｍを有する被めつき材の片面又は
両面に２０〜１００ｇ／m 2 のめつき付着量を有する合金
化溶融亜鉛めつき鋼板において、めつき層の平均Ｆｅ含
有率を８〜１６％、めつき層中のΓ相の厚さを0.２〜1.
５μｍとすることによつて、めつき層の耐衝撃密着性に
すぐれる合金化溶融亜鉛めつき鋼板を得ることができ
る。As described above, according to the present invention, the center line
One side of the covering material having an average roughness of 0.6 to 1.5 μm or
In an alloyed hot-dip galvanized steel sheet having a coating weight of 20 to 100 g / m 2 on both surfaces, the average Fe content of the coating layer is 8 to 16%, and the thickness of the Γ phase in the coating layer is 0. .2-1.
By setting the thickness to 5 μm, it is possible to obtain an alloyed hot-dip galvanized steel sheet having excellent impact adhesion of the plating layer.
【００１９】このような本発明による合金化溶融亜鉛め
つき鋼板は、自動車用や家庭電気製品用途に好適に用い
ることができる。The alloyed hot-dip galvanized steel sheet according to the present invention can be suitably used for automobiles and home electric appliances.
【図１】は、合金化溶融亜鉛めつき鋼板における被めつ
き材の中心線平均粗さ（Ｒａ）とめつき層の耐衝撃密着
性との関係を示すグラフである。FIG. 1 is a graph showing the relationship between the center line average roughness (Ra) of a material to be plated and the impact resistance of a plated layer in a galvannealed steel sheet.
【図２】は、合金化溶融亜鉛めつき鋼板におけるめつき
層のΓ相の厚さとめつき層の耐衝撃密着性との関係を示
すグラフである。FIG. 2 is a graph showing the relationship between the thickness of the Γ phase of the plating layer and the impact resistance of the plating layer in the alloyed hot-dip galvanized steel sheet.
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平４−360（ＪＰ，Ａ) 特開 平３−249160（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) C23C 2/00 - 2/40 ────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-4-360 (JP, A) JP-A-3-249160 (JP, A) (58) Fields investigated (Int. Cl. 7 , DB name) C23C 2/00-2/40
Claims (2)
めつき材の片面又は両面に２０〜１００ｇ／m 2 のめつき
付着量を有する合金化溶融亜鉛めつき鋼板において、め
つき層の平均Ｆｅ含有率が８〜１６％であり、めつき層
中のΓ相の厚さが0.２〜1.５μｍであることを特徴とす
る耐衝撃密着性にすぐれる合金化溶融亜鉛めつき鋼板。 An object having a center line average roughness of 0.6 to 1.5 μm.
Plated material of one side or plated of 20 to 100 g / m 2 on both surfaces
In an alloyed hot-dip galvanized steel sheet having an attached amount, the average Fe content of the plated layer is 8 to 16%, and the thickness of the Γ phase in the plated layer is 0.2 to 1.5 μm. Alloyed hot-dip galvanized steel sheet with excellent impact adhesion.
％以上を含むＦｅ−Ｚｎ系電気めつき層を有することを
特徴とする請求項１記載の合金化溶融亜鉛めつき鋼板。2. The method according to claim 1, wherein the alloyed molten zinc is further coated with Fe60.
The alloyed hot-dip galvanized steel sheet according to claim 1, further comprising a Fe-Zn-based electroplating layer containing at least 0.1% by mass.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4243125A JP3066458B2 (en) | 1992-09-11 | 1992-09-11 | Alloyed hot-dip galvanized steel sheet with excellent impact adhesion |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4243125A JP3066458B2 (en) | 1992-09-11 | 1992-09-11 | Alloyed hot-dip galvanized steel sheet with excellent impact adhesion |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0693402A JPH0693402A (en) | 1994-04-05 |
| JP3066458B2 true JP3066458B2 (en) | 2000-07-17 |
Family
ID=17099178
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4243125A Expired - Lifetime JP3066458B2 (en) | 1992-09-11 | 1992-09-11 | Alloyed hot-dip galvanized steel sheet with excellent impact adhesion |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3066458B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101601001B1 (en) * | 2011-09-30 | 2016-03-08 | 신닛테츠스미킨 카부시키카이샤 | High-strength hot-dip galvanized steel sheet |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2709174B2 (en) * | 1990-02-28 | 1998-02-04 | 日本鋼管株式会社 | Multi-layer alloyed hot-dip galvanized steel sheet with excellent powdering resistance, sliding properties and cratering resistance |
| JPH04360A (en) * | 1990-04-17 | 1992-01-06 | Nippon Steel Corp | Galvannealed steel sheet excellent in workability |
-
1992
- 1992-09-11 JP JP4243125A patent/JP3066458B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0693402A (en) | 1994-04-05 |
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