JPH0363130A - Aluminum surface treating material for cation electrodeposition coating - Google Patents
Aluminum surface treating material for cation electrodeposition coatingInfo
- Publication number
- JPH0363130A JPH0363130A JP19962889A JP19962889A JPH0363130A JP H0363130 A JPH0363130 A JP H0363130A JP 19962889 A JP19962889 A JP 19962889A JP 19962889 A JP19962889 A JP 19962889A JP H0363130 A JPH0363130 A JP H0363130A
- Authority
- JP
- Japan
- Prior art keywords
- electrodeposition coating
- coating
- aluminum
- resin
- corrosion 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.)
- Granted
Links
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 38
- 238000000576 coating method Methods 0.000 title claims abstract description 35
- 239000011248 coating agent Substances 0.000 title claims abstract description 32
- 239000000463 material Substances 0.000 title claims abstract description 31
- 238000004070 electrodeposition Methods 0.000 title claims abstract description 30
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 27
- 150000001768 cations Chemical class 0.000 title abstract 6
- -1 aluminum ions Chemical class 0.000 claims abstract description 13
- 239000011347 resin Substances 0.000 claims abstract description 12
- 229920005989 resin Polymers 0.000 claims abstract description 12
- 239000003513 alkali Substances 0.000 claims abstract description 7
- 235000019353 potassium silicate Nutrition 0.000 claims abstract description 7
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims abstract description 7
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 5
- 239000008119 colloidal silica Substances 0.000 claims abstract description 5
- 125000002091 cationic group Chemical group 0.000 claims description 23
- 239000000203 mixture Substances 0.000 claims description 6
- 238000004381 surface treatment Methods 0.000 claims description 5
- 239000004925 Acrylic resin Substances 0.000 claims description 2
- 229920000178 Acrylic resin Polymers 0.000 claims description 2
- 239000003822 epoxy resin Substances 0.000 claims description 2
- 229920000647 polyepoxide Polymers 0.000 claims description 2
- 229920002803 thermoplastic polyurethane Polymers 0.000 claims description 2
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 claims 1
- 239000005007 epoxy-phenolic resin Substances 0.000 claims 1
- 238000010422 painting Methods 0.000 claims 1
- 229920001568 phenolic resin Polymers 0.000 claims 1
- 238000005260 corrosion Methods 0.000 abstract description 16
- 230000007797 corrosion Effects 0.000 abstract description 16
- 239000010410 layer Substances 0.000 abstract description 14
- 238000011282 treatment Methods 0.000 abstract description 13
- 229910019142 PO4 Inorganic materials 0.000 abstract description 12
- 239000010452 phosphate Substances 0.000 abstract description 12
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 abstract description 11
- ZCDOYSPFYFSLEW-UHFFFAOYSA-N chromate(2-) Chemical compound [O-][Cr]([O-])(=O)=O ZCDOYSPFYFSLEW-UHFFFAOYSA-N 0.000 abstract description 8
- 239000011247 coating layer Substances 0.000 abstract description 4
- 238000006243 chemical reaction Methods 0.000 abstract description 3
- 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 abstract description 3
- 229910000165 zinc phosphate Inorganic materials 0.000 abstract description 3
- 230000015572 biosynthetic process Effects 0.000 abstract description 2
- 238000003411 electrode reaction Methods 0.000 abstract description 2
- 239000000126 substance Substances 0.000 abstract description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 14
- 238000010828 elution Methods 0.000 description 9
- 229910000831 Steel Inorganic materials 0.000 description 8
- 239000010959 steel Substances 0.000 description 8
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 7
- 238000000034 method Methods 0.000 description 7
- 238000007747 plating Methods 0.000 description 4
- 239000002585 base Substances 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 239000003973 paint Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 229910001297 Zn alloy Inorganic materials 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 125000000129 anionic group Chemical group 0.000 description 1
- HUTDDBSSHVOYJR-UHFFFAOYSA-H bis[(2-oxo-1,3,2$l^{5},4$l^{2}-dioxaphosphaplumbetan-2-yl)oxy]lead Chemical compound [Pb+2].[Pb+2].[Pb+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O HUTDDBSSHVOYJR-UHFFFAOYSA-H 0.000 description 1
- 238000005238 degreasing Methods 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000011342 resin composition Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
Landscapes
- Application Of Or Painting With Fluid Materials (AREA)
- Laminated Bodies (AREA)
- Chemical Treatment Of Metals (AREA)
Abstract
Description
（産業上の利用分野）
本発明はカチオン電着塗装用アルミニウム表面処理材に
関し、更に詳しくは、自動車用パネル等として、カチオ
ン電着され、更には中塗、上塗塗装して使用されるアル
ミニウム表面処理材に関する。
（従来の技術）
自動車用パネル材としては鋼板が多用されているが、ア
ルミニウム又はアル呉ニウム合金板材（以下、単に「ア
ルミニウム板」又は「アルミニウム材」と総称する）は
、その軽量性のみならず。
優れた耐食性のために注目されており、鋼板と組合せて
使用される場合が増大している。
高度な耐食性が要求される自動車パネル材は、鋼板とア
ルミニウム板をそれぞれ部材に成形した後１組合せ、下
地処理としてリン酸亜鉛処理を施し、電着塗装され、更
に中塗、上塗されるのが一般的である。
電着塗装に用いられる塗料としては、アニオン型からカ
チオン型に移行し、飛躍的に防食機能が強化され、現在
ではカチオン型電着塗装が定着している。
（発明が解決しようとする課題）
鋼板とアルミニウム板を自動車パネル材として組合せ使
用する方法として、特開昭６１−９６０７４号に開示さ
れている通り、アルミニウム板を成形した後、クロメー
ト処理し、次いで鋼板の成形体と組合せ、しかる後、り
ん酸層鉛処理を施し電着塗装をする方法が提案されてい
る。
この提案に係る方法においては、アルミニウム板をクロ
メート皮膜で被覆することによって、りん酸層鉛浴中に
溶出するアルミイオンを低減し、鋼板に対するりん酸層
鉛処理皮膜の生成に及ぼす悪影響を防止することを意図
したものであり、更にはアルミニウム材の電着塗装の耐
食性向上を図ったものであるが、クロメート皮膜自体の
りん酸層鉛浴中への溶出は避けられず、りん酸層鉛浴の
スラッジの増大やクロメート皮膜の耐食機能の低下等の
問題を含んでおり、必ずしも万全な方法とは云えない。
また、同様に、特開昭６１−１５７６９３号には、亜鉛
又は亜鉛合金めっき処理或いはＦａ系合金めっき処理し
たアルミニウム板を用い１、鋼板と共にりん酸塩処理を
行うことにより、りん酸塩浴中へのアルミイオンの溶出
を防止すると共に塗装の鮮映性向上を図る方法が提案さ
れているが、アルミニウムにはその表面に緻密な酸化皮
膜が生成するため、一般にめっき性が悪く、亜鉛等のめ
っきを工業的規模で均一に処理することは困難がある。
本発明は、上記従来技術の問題点を解決し、りん酸塩浴
中へのアルミイオン等の溶出防止とアルミニウム材のカ
チオン電着塗装後の耐食性を向上し得るカチオン電着塗
装用アルミニウム表面処理材を提供することを目的とす
るものである。
（課題を解決するための手段）
本発明者は、前述の通り、自動車パネル材等の用途にお
いて鋼板とアルミニウム板を組合せて５りん酸層鉛処理
し、カチオン電着塗装して使用する場合の問題点を解決
するべく、りん酸層鉛浴中へのアルミイオン等の溶出防
止とアルミニウム材のカチオン電着塗装後の耐食性向上
を可能にする方策について鋭意研究を重ねた。
その結果、アルカリ抵抗性を有し特定の皮膜厚さの樹脂
層を被覆することにより、また該被覆層に更にコロイダ
ルシリカ又は水ガラスを含有させることにより、可能で
あることを見い出したものである。
以下に本発明を更に詳細に説明する。
（作用）
本発明は、前述の如く、特定の被ｙＩＭをアルミニウム
材表面に形威し、カチオン電着塗装に供するが、被覆層
の形成に先立って、アルミニウム材表面にクロメート、
りん酸クロメート、或いはりん酸層鉛などのりん酸塩処
理等の化成処理を施すことができる。
ところで、カチオン電着塗装時、素材表面では次式で示
される反応が起こり、素材表面の近傍のＰＨはアルカリ
性となるが、従来のりん酸層鉛処理皮膜やクロメート処
理皮膜等々の下地処理では。
耐アルカリ性は充分とは言い難い。
２Ｈ２０＋２ｅ →２０Ｈ−十Ｈ，↑（カチオン塗料
） （析出）
そζで、本発明では、カチオン電着塗装を施す際、被処
理材表面のｐＨがアルカリ性となることに着目して、ア
ルカリに対して強靭な、主として樹脂成分からなる皮膜
を設け、カチオン電着塗装材の耐食性を向上せしめると
同時にりん酸塩浴中でのアルミイオン等の溶出を防止す
る点を主眼とするところである。
このように主として樹脂成分からなる皮膜は。
皮膜厚さが０．２μｍ未満では、アルミニウム材表面を
充分に被覆することは困難であって、りん酸層鉛浴中に
おいてアルミニウムイオン等の溶出を防止できず、また
カチオン電着塗装後において耐食性も充分でない、一方
、皮膜厚さが２μｍを超えると、皮膜の多孔性がなくな
り、電極反応が起こり難く、カチオン電着塗装が困難と
なる。したがって、該皮膜厚さは０．２〜２μｍの範囲
とする。
か＼るアルカリ抵抗性を有する皮膜を得るためには、具
体的には、アクリル樹脂、アクリル酸エステル樹脂、ウ
レタン樹脂、エポキシ樹脂、フエ！
ノール系樹脂からなる群の１種或いは２種以上を混合し
た組成物を作成し、更にはコロイダルシリカ、或いは前
述した水ガラスを添加した組成物をアルミニウム板材表
面に塗布することによって得られる。
樹脂組成物は、製造条件によって水溶性型（エマルジョ
ンを含む）或いは溶剤型が得られるが、どちらのタイプ
でも本発明の目的は達成できる。
なお、皮膜厚さが０．２〜２μ重と薄く多孔性の皮膜を
得るためには、固形分は３０重量％以下が望ましい。
また、コロイダルシリカ或いは水ガラスの添加量を樹脂
固形分に対し、望ましくは数％から数十％に調整するこ
とにより、皮膜を効果的に多孔性とすると共に耐アルカ
リ性を維持した皮膜を得ることができる。なお、ここで
、水ガラスとは、組成式ｘＭ２０ ・ｙ ５ｉＯ１（但
し１ＭはＬｉ、 Ｎａ、 Ｋを示し、ｙ／ｘが３以上で
ある）を有する水ガラスである。
上記皮１摸は多孔質であることが好ましい、皮膜の多孔
質性は、食塩中（例えば、１すむ％ＮａＣＱ）にて通ｆ
ｌ（例えば、電圧６ｖ）し、測定した漏洩電流が目安と
なり、最低数ｍＡ／ｄｍ１以上が好ましい。
次に本発明の実施例を示す。
（実施例）
ＪＩＳ５１８２板材（０，５開ｔ）を通常のアルカリ脱
脂した後、第１表に示す各種処理（前処理。
本処理）を施してサンプルを作成した６本処理では、バ
ーコータにより各組成物を塗布した後、１５０〜２００
℃において１分焼付した。
作成した各サンプルについて、りん酸層鉛浴中へのイオ
ン溶出、カチオン電着塗装後耐食性の評価を以下の要領
にて行った。それらの結果を第１表に併記する。
■りん酸層鉛浴中への溶出
各サンプルを４５℃のりん酸層鉛浴に２分浸漬後、アル
ミイオン等の溶出量を測定した。
■カチオン電着塗装後耐食性
カチオン電着塗装（２５０Ｖｘａ分）Ｌ、１７５℃×３
０分焼付けて電着塗装板を作成した。塗装面にスクラッ
チを入れ、ＪＩＳＺ２３７１に準じて塩水噴霧試験７５
０時間を実施した後、スクラッチからの最大腐食長さ（
片面）を測定した。
第１表より、本発明材はいずれも、りん酸層鉛浴中への
イオンの溶出が皆無か殆どなく、更にカチオン電着塗装
後の耐食性も優れていることがわかる。(Industrial Application Field) The present invention relates to an aluminum surface treatment material for cationic electrodeposition coating, and more specifically, aluminum surface treatment material used for cationic electrodeposition, intermediate coating, and top coating for automotive panels, etc. Regarding materials. (Prior art) Steel plates are often used as panel materials for automobiles, but aluminum or aluminum alloy plates (hereinafter simply referred to as "aluminum plates" or "aluminum materials") are not only lightweight. figure. It has attracted attention due to its excellent corrosion resistance, and is increasingly being used in combination with steel plates. Automotive panel materials, which require a high degree of corrosion resistance, are generally made of steel sheets and aluminum sheets, which are each formed into a component, then combined, treated with zinc phosphate as a base treatment, electrodeposited, and then coated with an intermediate coat and a top coat. It is true. The paints used for electrodeposition coating have shifted from anionic to cationic coatings, and their anticorrosion properties have been dramatically strengthened, and cationic electrodeposition coatings are now well-established. (Problem to be Solved by the Invention) As a method for using a steel plate and an aluminum plate in combination as an automobile panel material, as disclosed in JP-A-61-96074, an aluminum plate is formed, then chromate treated, and then A method has been proposed in which the material is combined with a molded steel sheet, and then subjected to a phosphate layer lead treatment and then electrodeposited. In this proposed method, by coating the aluminum plate with a chromate film, aluminum ions eluted into the phosphate layer lead bath are reduced, and the negative effects on the formation of the phosphate layer lead treatment film on the steel plate are prevented. This was intended to improve the corrosion resistance of the electrodeposition coating of aluminum materials, but the chromate film itself would inevitably elute into the phosphoric acid layer lead bath. However, this method cannot necessarily be said to be a perfect method, as it includes problems such as an increase in sludge and a decrease in the corrosion resistance of the chromate film. Similarly, in JP-A-61-157693, an aluminum plate treated with zinc or zinc alloy plating or Fa-based alloy plating is used. Methods have been proposed to prevent the elution of aluminum ions into aluminum and to improve the clarity of coatings, but since a dense oxide film forms on the surface of aluminum, it generally has poor plating properties, and It is difficult to process plating uniformly on an industrial scale. The present invention solves the above-mentioned problems of the prior art, and provides aluminum surface treatment for cationic electrodeposition coating that can prevent the elution of aluminum ions, etc. into a phosphate bath and improve the corrosion resistance of aluminum materials after cationic electrodeposition coating. The purpose is to provide materials. (Means for Solving the Problems) As mentioned above, the present inventor has discovered that, in applications such as automobile panel materials, steel plates and aluminum plates are combined, subjected to a 5-phosphate layer lead treatment, and then used by cationic electrodeposition coating. In order to solve these problems, we have conducted extensive research into ways to prevent the elution of aluminum ions into the phosphoric acid layer lead bath and to improve the corrosion resistance of aluminum materials after cationic electrodeposition coating. As a result, it was discovered that this is possible by coating with a resin layer having alkali resistance and a specific thickness, and by further containing colloidal silica or water glass in the coating layer. . The present invention will be explained in more detail below. (Function) As described above, in the present invention, a specific YIM is formed on the surface of an aluminum material and subjected to cationic electrodeposition coating.
A chemical conversion treatment such as phosphate treatment such as chromate phosphate or layered lead phosphate can be applied. By the way, during cationic electrodeposition coating, the following reaction occurs on the surface of the material, and the pH near the surface of the material becomes alkaline, but this is not the case with conventional base treatments such as phosphate layer lead treatment films and chromate treatment films. Alkali resistance cannot be said to be sufficient. 2H20+2e → 20H-10H, ↑ (cationic paint) (deposition) So, in the present invention, when applying cationic electrodeposition coating, we focus on the fact that the pH of the surface of the material to be treated becomes alkaline, and The main objective of this project is to provide a strong coating consisting mainly of resin components, to improve the corrosion resistance of the cationic electrodeposition coating material, and at the same time to prevent the elution of aluminum ions, etc. in the phosphate bath. In this way, the film consists mainly of resin components. If the film thickness is less than 0.2 μm, it will be difficult to sufficiently cover the surface of the aluminum material, and it will not be possible to prevent the elution of aluminum ions etc. in the phosphoric acid layer lead bath, and the corrosion resistance will be poor after cationic electrodeposition coating. On the other hand, if the film thickness exceeds 2 μm, the film loses porosity, making it difficult for electrode reactions to occur and making cationic electrodeposition coating difficult. Therefore, the film thickness is in the range of 0.2 to 2 μm. In order to obtain a film with such alkali resistance, specifically, acrylic resin, acrylic ester resin, urethane resin, epoxy resin, Hue! It can be obtained by preparing a composition in which one or more of the group consisting of nol resins is mixed, and further adding colloidal silica or the above-mentioned water glass to the composition and applying it to the surface of an aluminum plate material. Depending on the manufacturing conditions, the resin composition can be either a water-soluble type (including an emulsion) or a solvent type, and the object of the present invention can be achieved with either type. In order to obtain a thin and porous film having a thickness of 0.2 to 2 μm, the solid content is desirably 30% by weight or less. Furthermore, by adjusting the amount of colloidal silica or water glass added to the resin solid content, desirably from a few percent to several tens of percent, it is possible to effectively make the film porous and obtain a film that maintains alkali resistance. I can do it. Note that water glass herein is water glass having the composition formula xM20.y5iO1 (where 1M represents Li, Na, or K, and y/x is 3 or more). It is preferable that the skin 1 is porous.
1 (for example, a voltage of 6 V) and the measured leakage current serves as a guideline, and it is preferably at least several mA/dml or more. Next, examples of the present invention will be shown. (Example) After normal alkali degreasing of JIS5182 plate material (0.5 open t), various treatments (pretreatment and main treatment) shown in Table 1 were performed to create six samples. After applying the composition, 150-200
It was baked for 1 minute at ℃. For each sample prepared, ion elution into the phosphoric acid layer lead bath and corrosion resistance after cationic electrodeposition coating were evaluated in the following manner. The results are also listed in Table 1. (2) Elution into a phosphoric acid layer lead bath After each sample was immersed in a 45°C phosphoric acid layer lead bath for 2 minutes, the amount of aluminum ions etc. eluted was measured. ■Corrosion resistant cationic electrodeposition coating after cationic electrodeposition coating (250Vxa min) L, 175℃ x 3
An electrodeposition coated board was created by baking for 0 minutes. Scratch the painted surface and conduct salt spray test 75 according to JIS Z2371.
After running for 0 hours, the maximum corrosion length from scratch (
One side) was measured. From Table 1, it can be seen that all of the materials of the present invention have no or almost no elution of ions into the phosphoric acid layer lead bath, and also have excellent corrosion resistance after cationic electrodeposition coating.
（発明の効果）
以上詳述したように、本発明材は、りん酸塩浴中へのア
ルミイオン等の溶出が少なく、シかもカチオン電着塗装
後の耐食性も優れているため、自動車パネル材等で鋼と
組合せ使用される用途に好適であり、工業的効果が大き
い。(Effects of the Invention) As detailed above, the material of the present invention has less elution of aluminum ions, etc. into the phosphate bath, and has excellent corrosion resistance after cationic electrodeposition coating, so it can be used as an automobile panel material. It is suitable for use in combination with steel, etc., and has great industrial effects.
Claims (3)
で被覆されていることを特徴とするカチオン電着塗装用
アルミニウム表面処理材。(1) An aluminum surface-treated material for cationic electrodeposition coating, characterized by being coated with a resin having alkali resistance and having a thickness of 0.2 to 2 μm.
樹脂、ウレタン樹脂、エポキシ樹脂及びフェノール系樹
脂の１種又は２種以上の混合物を主成分とするものであ
る請求項１に記載のカチオン電着塗装用アルミニウム表
面処理材。(2) The cationic electrodeposition according to claim 1, wherein the resin is mainly composed of one or a mixture of two or more of acrylic resin, acrylic ester resin, urethane resin, epoxy resin, and phenolic resin. Aluminum surface treatment material for painting.
＿２Ｏ・ｙＳｉＯ＿２（但し、ＭはＬｉ、Ｎａ、Ｋを示
し、ｙ／ｘ比が３以上である）を有する水ガラスのいず
れかを含有している請求項１又は２に記載のカチオン電
着塗装用アルミニウム表面処理材。(3) In the resin, colloidal silica or composition formula xM
The cationic electrodeposition coating according to claim 1 or 2, which contains any of water glass having _2O・ySiO_2 (where M represents Li, Na, K, and the y/x ratio is 3 or more). Aluminum surface treatment material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1199628A JP2709632B2 (en) | 1989-08-01 | 1989-08-01 | Aluminum surface treatment material for cationic electrodeposition coating |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1199628A JP2709632B2 (en) | 1989-08-01 | 1989-08-01 | Aluminum surface treatment material for cationic electrodeposition coating |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0363130A true JPH0363130A (en) | 1991-03-19 |
| JP2709632B2 JP2709632B2 (en) | 1998-02-04 |
Family
ID=16411015
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1199628A Expired - Lifetime JP2709632B2 (en) | 1989-08-01 | 1989-08-01 | Aluminum surface treatment material for cationic electrodeposition coating |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2709632B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5512969A (en) * | 1995-02-14 | 1996-04-30 | Eastman Kodak Company | Water-resistant camera housing |
| US5541682A (en) * | 1995-02-14 | 1996-07-30 | Eastman Kodak Company | Sealing band for water-resistant camera housing |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6411830A (en) * | 1987-07-06 | 1989-01-17 | Nippon Steel Corp | Organic composite plated steel plate excellent in press formability, weldability, electrocoating property and corrosion resistance |
-
1989
- 1989-08-01 JP JP1199628A patent/JP2709632B2/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6411830A (en) * | 1987-07-06 | 1989-01-17 | Nippon Steel Corp | Organic composite plated steel plate excellent in press formability, weldability, electrocoating property and corrosion resistance |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5512969A (en) * | 1995-02-14 | 1996-04-30 | Eastman Kodak Company | Water-resistant camera housing |
| US5541682A (en) * | 1995-02-14 | 1996-07-30 | Eastman Kodak Company | Sealing band for water-resistant camera housing |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2709632B2 (en) | 1998-02-04 |
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