JPH05156413A - Aluminum alloy sheet for automobile body and production thereof - Google Patents
Aluminum alloy sheet for automobile body and production thereofInfo
- Publication number
- JPH05156413A JPH05156413A JP25312691A JP25312691A JPH05156413A JP H05156413 A JPH05156413 A JP H05156413A JP 25312691 A JP25312691 A JP 25312691A JP 25312691 A JP25312691 A JP 25312691A JP H05156413 A JPH05156413 A JP H05156413A
- Authority
- JP
- Japan
- Prior art keywords
- aluminum alloy
- oxide film
- aluminum
- alloy sheet
- treatment
- 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.)
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- Body Structure For Vehicles (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明は自動車ボディー用として
使用されるアルミニウム合金板及びその製造方法に関す
るものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aluminum alloy plate used for automobile bodies and a method for manufacturing the same.
【0002】[0002]
【従来の技術】近年自動車の燃費向上や高性能化を目的
として車体重量の低減が叫ばれており、これに伴い従来
使用されていた鉄鋼材料に代わって比重が鉄の約1/3
であるアルミニウム材料の使用が増えつつある。このア
ルミニウムは軽量であるばかりではなく、耐食性,加工
性,表面処理性等に優れ、さらに再生が容易であること
から自動車用材料として最も注目されている。そして現
在ボディー,ホイール,バンパー,熱交換器,エンジン
等に用いられており、さらに応用範囲も増えつつある。2. Description of the Related Art In recent years, there has been a call for a reduction in vehicle body weight for the purpose of improving the fuel efficiency and performance of automobiles. As a result, the specific gravity is about one-third that of iron instead of the conventionally used steel materials.
The use of aluminum materials is increasing. Not only is this aluminum lightweight, it is also excellent in corrosion resistance, workability, surface treatment properties, etc., and is easily regenerated, so it has attracted the most attention as a material for automobiles. It is currently used in bodies, wheels, bumpers, heat exchangers, engines, etc., and its range of applications is increasing.
【0003】アルミニウム材料を自動車用ボディーとし
て用いる場合、その製造方法や工程は従来の鉄及び鉄鋼
材料を用いた場合と基本的には同じであり、成形性,溶
接性,接着性,塗装後の耐食性,美観等が要求される。When an aluminum material is used as an automobile body, its manufacturing method and process are basically the same as those when using conventional iron and steel materials. Formability, weldability, adhesiveness, and after coating are used. Corrosion resistance and aesthetics are required.
【0004】 上記ボディーの製造工程を以下に述べる。 成形:コイルもしくはコイルより所定寸法に切断した板より所定の形状に成形 する。 ↓ 接合:溶接及び/又は接着にて周辺部品と接合する。その際従来の鉄及び鉄鋼 材料と組み合わされて次工程に流す。 ↓ 表面処理 i )脱脂:アルカリ系洗浄剤を使用 ↓ ii) 水洗 ↓ iii) 表面調整:コロイダルチタン酸塩処理等 ↓ iv) 化成処理:りん酸亜鉛処理 ↓ v )水洗 ↓─────場合によってはクロム酸系溶液による「後処理」を中間で実施 vi) 乾燥 ↓ 塗装 i )下塗り(電着塗装) ↓ ii) 中塗り ↓ iii) 上塗り ↓ 艤装The manufacturing process of the above body will be described below. Forming: A coil or a plate cut into a predetermined size from a coil is formed into a predetermined shape. ↓ Joining: Joining with peripheral parts by welding and / or bonding. At that time, it is combined with the conventional iron and steel materials and flowed to the next step. ↓ Surface treatment i) Degreasing: Using alkaline cleaner ↓ ii) Washing with water ↓ iii) Surface preparation: Colloidal titanate treatment, etc. ↓ iv) Chemical conversion treatment: Zinc phosphate treatment ↓ v) Washing with water ↓ ───── Case In some cases, "post-treatment" with a chromic acid solution is performed in the middle vi) Dry ↓ Coating i) Undercoat (electrodeposition coating) ↓ ii) Intermediate coating ↓ iii) Top coating ↓ Outfitting
【0005】上記〜の工程により自動車ボディーは
製造される。そして素材としてのアルミニウム板材は通
常の工程である、鋳造→ソーキング→熱間圧延→冷間圧
延→仕上焼鈍(冷間圧延途中に実施する場合あり)を経
て製造され、上記のようにコイルの状態又は所定の寸法
に切断後切板の状態にて成形工程に供される。An automobile body is manufactured by the above steps (1) to (3). Then, the aluminum plate material as a raw material is manufactured through a normal process of casting → soaking → hot rolling → cold rolling → finish annealing (may be performed during cold rolling), and the coil state as described above. Alternatively, after being cut to a predetermined size, it is subjected to a molding process in a state of a cut plate.
【0006】[0006]
【発明が解決しようとする課題】従来よりこのような自
動車ボディー用として供されるアルミニウム材料には以
下に示すような問題があった。 接着性不良:過酷環境により促進耐久試験を行うと接
合部より剥離を生じたり、接合部の接着強度が所望の値
を下回り、安全性や信頼性に支障がでる。 溶接性不良:スポット溶接時、連続して溶接可能な打
点数が低く、電極メンテナンス回数が多いことから生産
性が低い。 塗膜密着性不良:塗装後過酷環境により促進耐久試験
を行うと塗膜が剥離したり、膨れが生じて外観上美観を
損なう。 耐食性不良:塗装後過酷環境により促進耐久試験を行
うと糸状の腐食(糸錆腐食 Filiform corrosion )が生
じやすく、外観上美観を損なうばかりでなく、さらに進
行した場合には機能上問題も生ずる。The aluminum material conventionally used for such an automobile body has the following problems. Poor adhesion: When an accelerated durability test is performed in a harsh environment, peeling occurs from the joint, or the adhesive strength of the joint falls below a desired value, which impairs safety and reliability. Poor weldability: In spot welding, the number of spots that can be welded continuously is low, and the number of electrode maintenances is high, resulting in low productivity. Poor coating adhesion: When an accelerated durability test is performed in a harsh environment after coating, the coating peels off or swells, impairing the appearance. Poor corrosion resistance: Filiform corrosion is likely to occur when an accelerated durability test is performed in a harsh environment after painting, which not only impairs the aesthetic appearance but also causes a functional problem when it further progresses.
【0007】上記の問題のうち特に及びはアルミニ
ウム材のみを単独に自動車ボディーとして使用する場合
よりも、鉄鋼材料と組み合わせて使用する場合(塗装の
下地処理である化成処理がりん酸亜鉛処理の場合)の方
が発生頻度も多く、且つその程度も激しく問題であっ
た。Among the above problems, in particular and when the aluminum material alone is used in combination with the steel material, rather than when it is used alone as an automobile body (when the chemical conversion treatment which is the base treatment of the coating is zinc phosphate treatment) ) Was more frequent, and its severity was a serious problem.
【0008】[0008]
【課題を解決するための手段】本発明はこれに鑑み種々
検討した結果、このような接着性不良,溶接性不良,塗
膜密着性不良,耐食性不良の原因としてアルミニウム表
面の酸化皮膜が大きく関与していることを確認し、この
酸化皮膜と上記特性との関係をさらに詳細に検討して以
下の知見を得た。As a result of various investigations in view of the above, the present invention has been found to be largely related to the oxide film on the aluminum surface as a cause of such poor adhesion, poor weldability, poor coating adhesion and poor corrosion resistance. That is, the relationship between this oxide film and the above characteristics was examined in more detail, and the following findings were obtained.
【0009】接着性:酸化皮膜が厚いと酸化皮膜自身
が脆弱層(剥離部)として働き、接着強度を低下させ
る。Adhesiveness: If the oxide film is thick, the oxide film itself acts as a brittle layer (peeling portion), and the adhesive strength is reduced.
【0010】溶接性:酸化皮膜は基本的に電気的不導
体であることから、酸化皮膜が厚いと電気抵抗が大きく
なり電極に損傷を与える。これを連続して繰り返すとナ
ゲットと呼ばれる溶着部が小さくなって所望の強度が得
られなくなる。Weldability: Since the oxide film is basically an electrical non-conductor, if the oxide film is thick, the electrical resistance increases and the electrode is damaged. If this is repeated continuously, the welded part called a nugget becomes small and desired strength cannot be obtained.
【0011】塗装密着性:表面処理時の脱油後におい
て酸化皮膜が多く残存していると次工程の表面調整でり
ん酸亜鉛の析出核形成が満足に行われないので化成処理
においてりん酸亜鉛皮膜の付着量が少なく、又は/及び
りん酸亜鉛結晶が粗大化して塗装後の密着性を低下させ
る。このように脱脂後酸化皮膜が多く残存する原因は酸
化皮膜の厚さだけではなく、膜質にも大きく影響され
る。即ち酸化皮膜を構成するマグネシウム酸化物又は/
及びマグネシウム水酸化物が少なく、且つアルミニウム
酸化物又は/及びアルミニウム水酸化物としては結晶性
の酸化物又は/及び水酸化物が少ない方が脱脂後酸化皮
膜の残存が少ないことが判った。Coating adhesion: If a large amount of oxide film remains after deoiling during surface treatment, zinc phosphate precipitation nucleation will not be satisfactorily formed in the surface adjustment in the next step, so zinc phosphate during chemical conversion treatment. The amount of coating film adhered is small, and / or zinc phosphate crystals become coarse, and the adhesion after coating is reduced. The reason why a large amount of the oxide film remains after degreasing is greatly influenced not only by the thickness of the oxide film but also by the film quality. That is, magnesium oxide that forms the oxide film or /
It was also found that the less oxide hydroxide film after degreasing, the less magnesium hydroxide and less aluminum oxide and / or aluminum oxide crystalline oxide and / or hydroxide.
【0012】耐食性:基本的に塗膜密着性と同様に酸
化皮膜の厚さ及び質がりん酸亜鉛処理性を低下させるこ
とが原因である。Corrosion resistance: Basically, the cause is that the thickness and quality of the oxide film, like the adhesion of the coating film, deteriorates the zinc phosphate treatment property.
【0013】次にアルミニウム材料の酸化皮膜について
説明する。即ちアルミニウムは非常に活性な金属であ
り、温度(熱)や雰囲気中の水分(湿度)によって酸化
物又は/及び水酸化物を生成する。そしてこのように形
成されるアルミニウム材料の酸化皮膜の構造は合金組成
に大きく影響され、自動車ボディー用材料のようにMg
を0.3 〜8wt%含有する材料ではアルミニウム酸化物又
は/及び水酸化物だけでなく、マグネシウム酸化物又は
/及び水酸化物も共存する。このマグネシウム酸化物又
は/及び水酸化物はアルカリ不溶解性物質であり、表面
処理時の脱脂前に多く残存していると(アルカリ性)脱
脂後も残留し、次工程の表面調整及び化成処理性を低下
させるものである。Next, the oxide film of aluminum material will be described. That is, aluminum is a very active metal and forms oxides and / or hydroxides depending on temperature (heat) and moisture (humidity) in the atmosphere. The structure of the oxide film of the aluminum material formed in this way is greatly influenced by the alloy composition and
In a material containing 0.3 to 8% by weight, not only aluminum oxide and / or hydroxide but also magnesium oxide and / or hydroxide coexist. This magnesium oxide and / or hydroxide is an alkali-insoluble substance, and if a large amount remains before degreasing during surface treatment (alkaline), it remains even after degreasing, resulting in surface conditioning and chemical conversion treatability in the next step. Is to reduce.
【0014】そしてアルミニウム酸化物に関して述べる
と、アルミニウム酸化物は大きく分けて2種類あり、1
つはアモルファスな酸化膜(Al2 O3 )、他の一つは
結晶性の酸化膜である。この結晶性酸化膜はその生成雰
囲気によって様々な相があるが、代表的なものはGibbsi
te(γ−Al(OH)3 ),Bayerlite (α−Al(O
H)3 ),Boehmite(γ−AlOOH)等である。この
ような酸化膜について以下のようなことが判った。即ち
これら酸化膜は化学的挙動が異なっており、アモルファ
スな酸化膜は結晶性の酸化膜よりも酸,アルカリ中での
溶解性が高いことである。With respect to the aluminum oxide, there are roughly two types of aluminum oxide.
One is an amorphous oxide film (Al 2 O 3 ), and the other is a crystalline oxide film. This crystalline oxide film has various phases depending on the formation atmosphere, but the typical one is Gibbsi.
te (γ-Al (OH) 3 ), Bayerlite (α-Al (O
H) 3 ), Boehmite (γ-AlOOH) and the like. The following has been found regarding such an oxide film. That is, these oxide films have different chemical behaviors, and the amorphous oxide film has higher solubility in acid and alkali than the crystalline oxide film.
【0015】アルミニウム板表面にはこのような2種類
の酸化膜が混在しており、上記結晶性の酸化膜は湿潤雰
囲気で高温に曝された時に生ずる。そしてアルミニウム
板の製造工程において、このような結晶性の酸化膜が生
成する原因工程は熱間圧延であることが判明した。これ
は熱間圧延工程においては、一般に水性の圧延油を使用
して200 ℃以上で圧延されるからである。そしてこの結
果結晶性の酸化膜はその後の圧延で砕かれて延ばされる
が、アルミニウム素地に埋め込まれた形で最終まで残留
することになる。Such two kinds of oxide films are mixed on the surface of the aluminum plate, and the crystalline oxide film occurs when exposed to high temperature in a wet atmosphere. Then, in the manufacturing process of the aluminum plate, it was found that the process causing such a crystalline oxide film was hot rolling. This is because in the hot rolling process, generally, an aqueous rolling oil is used and rolling is performed at 200 ° C or higher. As a result, the crystalline oxide film is crushed and expanded by the subsequent rolling, but remains in the form of being embedded in the aluminum matrix until the end.
【0016】また塗装用アルミニウム材の場合、このよ
うな結晶性の酸化膜が多いと脱脂の際に完全には除去で
きずに残留し、その後の化成処理にて所望の化成皮膜量
が得られなかったり、化成皮膜結晶が粗大なため脆弱な
化成皮膜を生成することが判明した。つまり熱間圧延時
に結晶性の酸化膜が生成し、その皮膜が最終板まで残留
するので表面処理時の脱脂を行っても完全には除去でき
ずに残留し、その後の表面調整,化成処理性を低下させ
るので、塗装処理後の塗膜密着性,耐食性が低下してし
まうことが判った。In the case of an aluminum material for coating, if there are many such crystalline oxide films, they cannot be completely removed during degreasing and remain, and a desired amount of chemical conversion film can be obtained by subsequent chemical conversion treatment. It was found that the fragile chemical conversion film was formed because the crystal of the chemical conversion film was coarse. In other words, a crystalline oxide film is formed during hot rolling, and the film remains on the final plate, so even if degreasing is performed during surface treatment, it cannot be completely removed and remains. It was found that the coating adhesion and the corrosion resistance after the coating treatment were deteriorated because of the decrease in the coating strength.
【0017】本発明は以上に鑑み、このような酸化皮膜
の膜厚及び膜質をコントロールしたアルミニウム材料に
より、溶接性不良,接着性不良,塗膜密着性不良,耐食
性不良を解決した優れた自動車ボディー用材料を提供す
ることにある。In view of the above, the present invention provides an excellent automobile body that solves poor weldability, poor adhesion, poor coating adhesion, and poor corrosion resistance by using an aluminum material whose oxide film thickness and quality are controlled. It is to provide materials for use.
【0018】即ち本発明アルミニウム合金板は、表面酸
化皮膜の厚さを10〜200 オングストロームとし、さらに
表面粗さとして平均表面粗さ(Ra)0.1 〜2.5 μm及び
最大表面粗さ(Rmax)0.5 〜40μmであることを特徴と
するものである。That is, in the aluminum alloy sheet of the present invention, the thickness of the surface oxide film is 10 to 200 angstrom, and the average surface roughness (Ra) is 0.1 to 2.5 μm and the maximum surface roughness (Rmax) is 0.5 to. It is characterized by being 40 μm.
【0019】また本発明のアルミニウム合金板の製造方
法の一つは、アルミニウム合金板を製造する熱間圧延以
降の工程中、又は最終製造工程にて表面を1回以上洗浄
して表面を5mg/m2 以上エッチングすることを特徴とす
るものであり、さらに本発明の他の製造方法の一つは、
アルミニウム合金板を製造する熱間圧延以降の工程中、
又は最終製造工程にて表面を1回以上洗浄して表面を5
mg/m2 以上エッチングした後安定化処理を行うことを特
徴とするものである。Further, one of the methods for producing an aluminum alloy sheet of the present invention is to wash the surface one or more times during the steps after the hot rolling for producing the aluminum alloy sheet or in the final production step to give the surface of 5 mg / min. m 2 or more is characterized by etching, further one of the other manufacturing method of the present invention,
During the process after hot rolling to produce an aluminum alloy plate,
Or, in the final manufacturing process, wash the surface more than once and
It is characterized by performing a stabilization treatment after etching at mg / m 2 or more.
【0020】[0020]
【作用】先ず表面酸化皮膜の厚さを10〜200 オングスト
ロームと限定した理由を説明する。酸化皮膜の厚さが10
オングストローム未満ではスポット溶接時に電気抵抗が
小さすぎるため十分な発熱が得られないのでナゲットが
形成しないからである。また200 オングストロームを越
えると接着時に酸化膜自身が脆弱層として働くので接着
強度を低下させ、且つスポット溶接時においては電気抵
抗が大きすぎるため電極損傷をきたして連続打点が低下
してしまい、さらに表面処理時の脱脂において完全に除
去されないので脱脂後酸化膜の残存が多くなり、表面調
整, 化成処理性を低下させて化成皮膜量が少なくなった
り、又は/ 及びりん酸亜鉛結晶が粗大化して塗装後の密
着性,耐食性を低下させるからである。[Function] First, the reason why the thickness of the surface oxide film is limited to 10 to 200 Å will be described. Oxide film thickness is 10
If it is less than angstrom, electric resistance is too small during spot welding and sufficient heat cannot be obtained, so that no nugget is formed. If it exceeds 200 angstroms, the oxide film itself will act as a fragile layer during bonding, reducing the adhesive strength, and during spot welding, the electrical resistance will be too large, causing electrode damage and a decrease in continuous spotting. Since it is not completely removed during degreasing during processing, the amount of oxide film remaining after degreasing increases, which reduces the surface conditioning and chemical conversion processability and reduces the amount of chemical conversion film, or / and zinc phosphate crystals become coarse and painted. This is because the subsequent adhesion and corrosion resistance are reduced.
【0021】また板材の表面粗さを、Ra (平均粗さ)
0.1 〜2.5 μm,Rmax (最大粗さ)0.5 〜40μmと限
定したのは、Ra が 0.1μm未満及びRmax が0.5μm
未満の場合は、成形時に得られる潤滑油の保持性が悪く
て成形性を低下させ、さらに接着時に付着面積が小さく
なって接着性も低下させるからである。一方Ra が2.5
μmを越え及びRmax が40μmを越えると塗装後の塗膜
表面の平滑性(鮮映性)が低下し、外観上商品価値を低
下させてしまう。The surface roughness of the plate material is Ra (average roughness)
The limits of 0.1 to 2.5 μm and Rmax (maximum roughness) 0.5 to 40 μm are that Ra is less than 0.1 μm and Rmax is 0.5 μm.
If it is less than the above range, the retaining property of the lubricating oil obtained at the time of molding is poor and the moldability is lowered, and further, the adhesion area is reduced at the time of bonding and the adhesiveness is also decreased. On the other hand, Ra is 2.5
If it exceeds .mu.m and Rmax exceeds 40 .mu.m, the smoothness (vividness) of the coating film surface after coating is deteriorated and the commercial value of appearance is deteriorated.
【0022】次にアルミニウム合金板材に対して施すエ
ッチングは熱間圧延時に生成した酸化皮膜を除去するこ
とと、200 オングストローム以上に成長した酸化膜厚を
低減することを目的とするものである。そして工程上で
エッチングを施す位置は熱間圧延以降であればいずれで
も効果があるが、特に最終工程で行うと最も有効であ
る。この場合エッチング量を5mg/m2 以上としたのは、
5mg/m2 未満では結晶性の酸化膜を完全に除去できない
からである。Next, the etching applied to the aluminum alloy plate material is intended to remove the oxide film formed during hot rolling and to reduce the oxide film thickness grown to 200 angstroms or more. The position of etching in the process is effective at any position after hot rolling, but it is most effective particularly at the final process. In this case, the etching amount of 5 mg / m 2 or more is
This is because if the amount is less than 5 mg / m 2 , the crystalline oxide film cannot be completely removed.
【0023】また上記洗浄後に安定化処理を行うのは、
先に記載したようにアルミニウム材は活性な金属である
ため、上記エッチング直後は酸化皮膜厚は薄いが放置し
ておくと増膜してしまうためである。例えば下記実施例
で示すように、安定化処理を実施しない場合であっても
エッチングした直後に次工程で溶接等を施せば問題はな
いが、時間が経るに従って酸化皮膜が厚くなり、本発明
のアルミニウム合金板の酸化皮膜厚として規定する200
オングストローム以上に増膜することがある。特にMg
量が多い材料では増膜速度も大きいため、エッチング後
に増膜抑制を目的とした安定化処理を行うのが望まし
い。安定化処理方法としては、油(防錆油)を塗布する
方法やりん酸イオン又はりん酸塩を含有した溶液中にて
処理する方法、及びそれらを組み合わせた方法などがあ
る。ここでりん酸イオン又はりん酸塩を含有した溶液と
は、りん酸ナトリウム,次亜りん酸ナトリウム,ピロリ
ン酸ナトリウム等の1種又は2種以上を1ppm 以上含有
した溶液をいう。なお油を塗布する場合は防錆油以外に
成形用潤滑油等を塗布しても十分効果がある。The stabilization treatment after the above washing is
This is because, as described above, the aluminum material is an active metal, and therefore the oxide film has a small thickness immediately after the etching, but increases in film thickness if left to stand. For example, as shown in the following examples, even if the stabilization treatment is not carried out, there is no problem if welding or the like is performed in the next step immediately after etching, but the oxide film becomes thicker with the passage of time. 200 specified as oxide film thickness of aluminum alloy plate
The film may be thicker than angstrom. Especially Mg
Since a material having a large amount has a high film-forming rate, it is desirable to perform a stabilization treatment for the purpose of suppressing the film-forming after etching. Examples of the stabilizing treatment method include a method of applying oil (antirust oil), a method of treating in a solution containing phosphate ion or phosphate, and a method of combining them. Here, the solution containing phosphate ion or phosphate means a solution containing 1 ppm or more of one or more of sodium phosphate, sodium hypophosphite, sodium pyrophosphate and the like. When oil is applied, it is sufficiently effective to apply lubricating oil for molding or the like in addition to rust preventive oil.
【0024】さらに洗浄に用いる洗浄剤については、ア
ルミニウムをエッチングするものであれば特に限定はし
ないが酸性洗剤の場合pH5以下,アルカリ洗剤の場合
pH10以上のものであれば、試薬,市販液を問わない。
例えば酸性洗剤としては硝酸系,硫酸系,りん酸系,ふ
っ酸系等及びこれらの複合系があり、アルカリ性洗剤と
しては水酸化ナトリウム系,りん酸ナトリウム系,炭酸
ナトリウム系等及びこれらの複合系があるが、いずれを
用いても問題はない。The cleaning agent used for cleaning is not particularly limited as long as it etches aluminum, but any reagent or commercially available liquid may be used as long as it has a pH of 5 or less for an acidic detergent and a pH of 10 or more for an alkaline detergent. Absent.
For example, acid detergents include nitric acid-based, sulfuric acid-based, phosphoric acid-based, hydrofluoric acid-based, etc., and composites thereof, and alkaline detergents include sodium hydroxide-based, sodium phosphate-based, sodium carbonate-based, etc., and composites thereof. There is no problem in using either one.
【0025】またこれら洗浄後にスマット除去を行った
方が好ましい。スマットとは不溶解性残渣のことであ
り、エッチング時に溶解せずに表面に残留したものをい
う。エッチング量が少ない場合は問題はないが、エッチ
ング量が多いとスマットの発生も多くなり接着性,溶接
性,塗膜密着性,耐食性に支障をきたす場合があるた
め、エッチング後(特にアルカリ性洗剤使用時)はスマ
ット除去を行った方が良い。Further, it is preferable to remove the smut after these washings. The smut means an insoluble residue, which is not dissolved during etching and remains on the surface. If the etching amount is small, there will be no problem, but if the etching amount is large, smut will increase, which may affect the adhesiveness, weldability, coating adhesion, and corrosion resistance. It is better to remove the smut when
【0026】このような本発明の製造方法は材料をコイ
ルから所定寸法に切り出した板にて実施してもよいが、
コイルの状態のまま連続的に実施した方が効率がよく且
つ生産性の向上にも寄与する。The manufacturing method of the present invention as described above may be carried out by using a plate obtained by cutting a material into a predetermined size from a coil.
It is more efficient to carry out continuously in the state of the coil, and it also contributes to the improvement of productivity.
【0027】さらに通常アルミニウム材料を、車体構造
材として鉄鋼材料と組み合わせて使用する場合は、表面
処理各液中に溶け込む溶存アルミニウムにより鉄鋼材料
の化成処理性が低下することが問題となっているが、本
発明アルミニウム合金板を用いると化成処理時の化成皮
膜生成速度が大きいため、液中へのアルミニウムイオン
の溶出が抑制されるので有利である。Further, when an ordinary aluminum material is used in combination with a steel material as a vehicle body structural material, there is a problem that the chemical conversion processability of the steel material is deteriorated by the dissolved aluminum dissolved in each surface treatment liquid. The use of the aluminum alloy sheet of the present invention is advantageous because the rate of formation of the chemical conversion film during the chemical conversion treatment is high and the elution of aluminum ions into the liquid is suppressed.
【0028】[0028]
【実施例】以下に本発明の実施例を示すが、本発明がこ
のような実施例によって何ら制約を受けるものではな
く、また本発明には以下の実施例の他にも、さらには上
記の具体的記述以外にも本発明の趣旨を逸脱しないかぎ
りにおいて、当業者の知識に基づいて種々の変更,修
正,改良等を加え得るものであることは言うまでもな
い。EXAMPLES Examples of the present invention will be shown below, but the present invention is not limited to these examples, and the present invention is not limited to the following examples, and further, the above-mentioned examples. It goes without saying that various changes, modifications, improvements and the like can be made based on the knowledge of those skilled in the art without departing from the spirit of the present invention, other than the specific description.
【0029】JIS A5182(Al-0.3wt%Mn-
4.5wt%Mg)を溶解、鋳造、均質化処理、熱間圧延、
冷間圧延、仕上げ焼鈍により、厚さ1.0mm の板材にコイ
ル連続処理にて仕上げた。この板材を表1に示すように
エッチング処理し、その後スマット除去処理をし、さら
にその後安定化処理を実施し、又は実施しなかったそれ
ぞれの板材について、次のような試験を行い各特性を評
価してそれぞれ結果を表2に示した。なお安定化処理を
実施しなかった本発明材No.7はスマット除去後、試験板
材を長時間放置することなく直ちに下記の試験を行っ
た。JIS A5182 (Al-0.3wt% Mn-
4.5wt% Mg), melting, casting, homogenization treatment, hot rolling,
By cold rolling and finish annealing, a plate material with a thickness of 1.0 mm was finished by continuous coil treatment. As shown in Table 1, this plate material was subjected to etching treatment, then smut removal treatment, and then stabilization treatment, or with respect to each plate material that was not performed, the following tests were conducted to evaluate each characteristic. The results are shown in Table 2. The material No. 7 of the present invention which had not been subjected to the stabilization treatment was subjected to the following test immediately after removing the smut and without leaving the test plate material for a long time.
【0030】(1) 接着性試験:25×100mm に切断した2
枚の板材をラップ幅13mmにて市販のエポキシ系接着剤を
用いて張り合わせ、170 ℃×30分の焼付けを行った。そ
の後JIS Z2371 の塩水噴霧試験を90日間行い、塩水噴霧
試験前後の引張剪断強さを測定し、下記式により求めた
強度の残存率で示した。 (1) Adhesion test: 2 cut into 25 × 100 mm
The plate materials were laminated with a commercially available epoxy adhesive with a wrap width of 13 mm and baked at 170 ° C. for 30 minutes. After that, a JIS Z2371 salt spray test was conducted for 90 days, the tensile shear strength before and after the salt spray test was measured, and the residual ratio of the strength determined by the following formula was shown.
【0031】(2) 溶接性試験:スポット溶接による連続
打点数(電極が損傷し、ナゲットが形成されなくなるま
での打点数)(2) Weldability test: the number of continuous spots by spot welding (the number of spots until the electrode is damaged and no nugget is formed)
【0032】(3) 塗膜密着性試験:上記アルミニウムコ
イルから70×150mm の板を切り出し、弱アルカリ系脱脂
剤を用いて45℃×30秒の脱脂をして水洗を行った後、コ
ロイダルチタン系の液にて室温×30秒の表面調整を行
い、そのままの状態で市販のりん酸亜鉛処理液にて45℃
×2分の化成処理を行った。その後水洗、乾燥を行った
後、カチオン電着塗装による下塗りと吹きつけによる中
塗り、及び上塗りを行って試験サンプルを作製した。上
記サンプルを50℃の温水中に20日間浸漬し、その後JIS
D0202 に規定するごばん目試験(2mm×2mmのごばん目
を100 個作製してテープによる剥離試験)により剥離せ
ずに残ったごばん目の個数を次のように示すことによ
り、密着性を評価した。 残存個数/試験個数( 100個)(3) Coating film adhesion test: A 70 × 150 mm plate was cut out from the above aluminum coil, degreased with a weak alkaline degreasing agent at 45 ° C. for 30 seconds and washed with water, and then colloidal titanium. The surface of the system is adjusted for 30 seconds at room temperature with a system solution, and then, as it is, with a commercially available zinc phosphate treatment solution at 45 ° C.
× 2 minutes of chemical conversion treatment. Then, after washing with water and drying, an undercoat by cationic electrodeposition coating, an intermediate coating by spraying, and an overcoat were performed to prepare a test sample. Soak the above sample in warm water at 50 ℃ for 20 days, then
Adhesion is shown by indicating the number of the left-eye stitches that have not been peeled off by the eye-eye test specified in D0202 (100 pieces of 2mm x 2mm eyes made by peeling test with tape) as follows. Was evaluated. Remaining number / test number (100)
【0033】(4) 耐食性試験:上記(3) の塗膜密着性試
験と同様にして塗装サンプルを作製した後、サンプル表
面に素地まで達するクロスカット(×印)を入れ、JIS
Z2371 による塩水噴霧試験を24時間行い、その後50℃で
95%の湿潤雰囲気にて2000時間放置した後クロスカット
部から発生した糸錆(糸状腐食)の最大長さを測定して
評価した。(4) Corrosion resistance test: A coated sample was prepared in the same manner as in the coating film adhesion test of (3) above, and then a cross-cut (marked with X) reaching the substrate was put on the sample surface, and JIS was used.
The salt spray test with Z2371 was carried out for 24 hours and then at 50 ° C.
After leaving it in a 95% wet atmosphere for 2000 hours, the maximum length of thread rust (filament corrosion) generated from the cross cut portion was measured and evaluated.
【0034】[0034]
【表1】 [Table 1]
【0035】[0035]
【表2】 [Table 2]
【0036】表1によれば本発明方法で製造したアルミ
ニウム合金板はいずれの特性においても優れていること
が判る。これに対して酸化皮膜厚及び表面粗さが本発明
で規定する範囲から外れる比較合金板材は、少なくとも
1つ以上の特性において劣っていることが明らかであ
る。It can be seen from Table 1 that the aluminum alloy plate produced by the method of the present invention is excellent in all properties. On the other hand, it is apparent that the comparative alloy sheet having the oxide film thickness and the surface roughness out of the ranges defined by the present invention is inferior in at least one characteristic.
【0037】[0037]
【発明の効果】このように本発明によれば、接着性,溶
接性,塗膜密着性,耐食性のいずれにも優れる自動車ボ
ディー用アルミニウム合金板材が得られる。As described above, according to the present invention, it is possible to obtain an aluminum alloy sheet material for an automobile body which is excellent in adhesion, weldability, coating adhesion and corrosion resistance.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 難波江 元広 東京都千代田区丸の内2丁目6番1号 古 河アルミニウム工業株式会社内 (72)発明者 石田 洋治 東京都千代田区丸の内2丁目6番1号 古 河アルミニウム工業株式会社内 (72)発明者 栗原 正明 東京都千代田区丸の内2丁目6番1号 古 河電気工業株式会社内 ─────────────────────────────────────────────────── ─── Continued front page (72) Motohiro Namba Motohiro 2-6-1, Marunouchi, Chiyoda-ku, Tokyo Furukawa Aluminum Co., Ltd. (72) Inventor Yoji Ishida 2--6, Marunouchi, Chiyoda-ku, Tokyo No. 1 in Furukawa Aluminum Co., Ltd. (72) Inventor Masaaki Kurihara 2-6-1, Marunouchi, Chiyoda-ku, Tokyo Inside Furukawa Electric Co., Ltd.
Claims (3)
トロームとし、さらに表面粗さとして平均表面粗さ(R
a)0.1 〜2.5 μm及び最大表面粗さ(Rmax)0.5 〜40μ
mであることを特徴とする自動車ボディー用アルミニウ
ム合金板。1. The surface oxide film has a thickness of 10 to 200 angstroms, and the average surface roughness (R
a) 0.1 to 2.5 μm and maximum surface roughness (Rmax) 0.5 to 40 μm
An aluminum alloy plate for an automobile body, which is characterized by being m.
以降の工程中、又は最終製造工程にて表面を1回以上洗
浄して表面を5mg/m2 以上エッチングすることを特徴と
する自動車ボディー用アルミニウム合金板の製造方法。2. An automobile body characterized by cleaning the surface one or more times and etching the surface by 5 mg / m 2 or more in a step after hot rolling for manufacturing an aluminum alloy plate or in a final manufacturing step. Aluminum alloy sheet manufacturing method.
以降の工程中、又は最終製造工程にて表面を1回以上洗
浄して表面を5mg/m2 以上エッチングした後安定化処理
を行うことを特徴とする自動車ボディー用アルミニウム
合金板の製造方法。3. Stabilizing treatment is performed after the surface is washed once or more and the surface is etched by 5 mg / m 2 or more in a step after hot rolling for manufacturing an aluminum alloy plate or in a final manufacturing step. A method for manufacturing an aluminum alloy plate for a car body, which is characterized.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP25312691A JPH05156413A (en) | 1991-09-04 | 1991-09-04 | Aluminum alloy sheet for automobile body and production thereof |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP25312691A JPH05156413A (en) | 1991-09-04 | 1991-09-04 | Aluminum alloy sheet for automobile body and production thereof |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH05156413A true JPH05156413A (en) | 1993-06-22 |
Family
ID=17246865
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP25312691A Pending JPH05156413A (en) | 1991-09-04 | 1991-09-04 | Aluminum alloy sheet for automobile body and production thereof |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH05156413A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2020055855A1 (en) * | 2018-09-11 | 2020-03-19 | Novelis Inc. | Highly deformable and thermally treatable continuous coils and method of producing the same |
-
1991
- 1991-09-04 JP JP25312691A patent/JPH05156413A/en active Pending
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2020055855A1 (en) * | 2018-09-11 | 2020-03-19 | Novelis Inc. | Highly deformable and thermally treatable continuous coils and method of producing the same |
WO2020055854A1 (en) * | 2018-09-11 | 2020-03-19 | Novelis Inc. | Continuous coils containing a thin anodized film layer and systems and methods for making the same |
CN112703276A (en) * | 2018-09-11 | 2021-04-23 | 诺维尔里斯公司 | Continuous coil containing thin anodic oxide film layer and system and method for manufacturing the same |
CN112996953A (en) * | 2018-09-11 | 2021-06-18 | 诺维尔里斯公司 | Highly deformable and heat-treatable continuous coil and method for producing same |
JP2021535960A (en) * | 2018-09-11 | 2021-12-23 | ノベリス・インコーポレイテッドNovelis Inc. | A continuous coil containing a thin anodic oxide film layer and a system and method for manufacturing the same. |
JP2022500563A (en) * | 2018-09-11 | 2022-01-04 | ノベリス・インコーポレイテッドNovelis Inc. | Highly deformable and heat-treatable continuous coil and its manufacturing method |
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