JPH08267655A - Pre-coated steel sheet excellent in corrosion resistance and fingerprint resistance - Google Patents
Pre-coated steel sheet excellent in corrosion resistance and fingerprint resistanceInfo
- Publication number
- JPH08267655A JPH08267655A JP7387995A JP7387995A JPH08267655A JP H08267655 A JPH08267655 A JP H08267655A JP 7387995 A JP7387995 A JP 7387995A JP 7387995 A JP7387995 A JP 7387995A JP H08267655 A JPH08267655 A JP H08267655A
- Authority
- JP
- Japan
- Prior art keywords
- resin
- steel sheet
- coating
- corrosion resistance
- film
- 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
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- Application Of Or Painting With Fluid Materials (AREA)
- Laminated Bodies (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、家電分野、建材等に使
用される塗装鋼板に係わり、詳しくは冷延鋼板を素材と
した耐食性、耐指紋性に優れた塗装鋼板に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coated steel sheet used in the field of home appliances, building materials and the like, and more particularly to a coated steel sheet which is made of a cold rolled steel sheet and has excellent corrosion resistance and fingerprint resistance.
【０００２】[0002]
【従来の技術】最近、家電分野を中心に亜鉛めっきにク
ロメートおよび有機薄膜を形成させた鋼板が家電製品の
多くの部位に使用されるようになってきた。これらの鋼
板は、亜鉛めっきにクロメートを塗布することで耐食性
を、また有機薄膜により耐指紋性を付与されており、主
に裸使用が行われているが、塗装後使用も一部行われて
いる。2. Description of the Related Art Recently, mainly in the field of home appliances, steel sheets obtained by forming chromate and an organic thin film on zinc plating have come to be used in many parts of home appliances. These steel sheets are given corrosion resistance by applying chromate to zinc plating and fingerprint resistance by an organic thin film, and are mainly used naked, but some are also used after painting. There is.
【０００３】このような製品の製造は、一般的にはめっ
き後、別ラインで塗装を行ういわゆるオフライン処理で
行われている。これらのオフライン処理では、ライン間
の搬送費用、各ラインでの歩留り等その他により、多大
な製造コストが避けられないのが実状である。一方、こ
れらの製造コスト要因削減のための解決策として、めっ
き後連続でクロメート処理、樹脂処理を行ういわゆるイ
ンライン処理も一部で行われている。しかし、この場合
でも、めっき設備に後処理設備を設置するために多大な
初期投資を伴い、あまり経済的でない。The manufacture of such products is generally carried out by so-called off-line processing in which coating is performed on another line after plating. In these off-line processes, in reality, a large manufacturing cost cannot be avoided due to transportation costs between lines, yield in each line, and the like. On the other hand, as a solution for reducing these manufacturing cost factors, so-called in-line processing, in which chromate treatment and resin treatment are continuously performed after plating, is also partially performed. However, even in this case, a large amount of initial investment is required to install a post-treatment facility in the plating facility, which is not economical.
【０００４】これらに対し、冷延鋼板をめっきせずに直
接塗装ラインで耐食性、耐指紋性等を満足するような塗
装鋼板の供給が可能であれば大幅なコストダウンにつな
がるのであるが、冷延鋼板に直接塗装しても十分な耐食
性が得られないのが実状である。この耐食性に関して
は、特に塗膜欠陥部で顕著である。これは冷延鋼板で
は、めっき鋼板のような鋼板に対する犠牲防食性が全く
ないからである。On the other hand, if it is possible to supply a coated steel sheet that satisfies corrosion resistance, fingerprint resistance, etc. directly on the coating line without plating the cold-rolled steel sheet, it will lead to a significant cost reduction. The actual situation is that sufficient corrosion resistance cannot be obtained even if it is applied directly to a rolled steel sheet. This corrosion resistance is remarkable especially in the coating film defective portion. This is because cold-rolled steel sheets have no sacrificial corrosion resistance against steel sheets such as plated steel sheets.
【０００５】これに対し、耐食性向上のために下塗り塗
料中にクロム系顔料に代表される防錆顔料を添加し、そ
の不動体化作用を利用することが一般的に行われている
が、多少赤錆発生を遅らすことは可能であるが、効果は
小さい。一方、耐食性向上のために塗料中に亜鉛末を添
加し、その犠牲防食性を利用する技術も数多く見られ
る。たとえば、ジンクロメタル（商品名）や、特開昭５
４−６１２７７号公報、特開平１−１４８６７号公報、
特開平１−２００５９号公報に見られる冷延鋼板に亜鉛
末塗料を塗装することで溶接性を付与すると同時に耐食
性も向上させた鋼板などである。しかし、これらの鋼板
に適用されている亜鉛末塗料は、その塗膜硬度が非常に
低く、そのために取り扱い時に表面に傷がつきやすいと
いう欠点をもっている。通常これらの製品は自動車用と
して使用されることが多く、その場合後塗装されるた
め、これらの傷が問題になることはほとんどなかった
が、家電分野では、そのまま使用されることも多く、こ
れらの鋼板が適用されることはほとんどなかった。On the other hand, in order to improve the corrosion resistance, it is generally practiced to add a rust preventive pigment represented by a chromium-based pigment to the undercoat paint and utilize its immobilizing effect. It is possible to delay the generation of red rust, but the effect is small. On the other hand, there are many techniques in which zinc dust is added to the paint to improve the corrosion resistance and the sacrificial corrosion resistance is utilized. For example, zinc metal (trade name) and JP-A-5
4-61277, JP-A-1-14867,
It is a steel sheet or the like which is given a weldability by coating a zinc dust coating on a cold rolled steel sheet as disclosed in JP-A 1-20059 and at the same time has improved corrosion resistance. However, the zinc dust coating applied to these steel sheets has a very low coating film hardness, which has the drawback that the surface is easily scratched during handling. Usually, these products are often used for automobiles, in which case they are painted later, so these scratches were rarely a problem, but in the field of home appliances, they are often used as they are. The steel plate of was rarely applied.
【０００６】[0006]
【発明が解決しようとする課題】本発明は、家電分野、
建材等に使用されているこれらの製品に関するものであ
り、冷延鋼板をめっき処理せず、塗装ラインで直接塗装
するだけで、これらに要求されている耐食性、耐指紋性
等を満足させようとするものである。そして、これによ
りこれら製品の大幅なコストダウンを達成することを目
的としたものである。DISCLOSURE OF THE INVENTION The present invention relates to the field of home appliances,
It relates to these products used for building materials, etc., and it is intended to satisfy the corrosion resistance, fingerprint resistance, etc. required for these by simply coating directly on the coating line without plating the cold-rolled steel sheet. To do. The purpose of this is to achieve a significant cost reduction of these products.
【０００７】[0007]
【課題を解決するための手段】本発明の第１の発明は、
冷延鋼板の少なくとも一方の面に、リン酸塩皮膜または
クロメート皮膜を有し、その上に基体樹脂および亜鉛末
からなり、基体樹脂と亜鉛末との重量比が基体樹脂／亜
鉛末＝１／１〜１／９である下塗り塗料を塗装した膜を
有し、さらにその上にシリカを含有した樹脂からなり、
樹脂とシリカとの重量比が樹脂／シリカ＝１／０．０５
〜１／０．５である上塗り塗料を塗装した膜を有するこ
とを特徴とする耐食性、耐指紋性に優れた塗装鋼板であ
る。The first invention of the present invention is as follows:
At least one surface of the cold-rolled steel sheet has a phosphate film or a chromate film, which is composed of a base resin and zinc dust, and the weight ratio of the base resin and zinc dust is base resin / zinc dust = 1 / It has a film coated with an undercoat paint of 1/9, and is made of a resin containing silica thereon,
The weight ratio of resin and silica is resin / silica = 1 / 0.05
It is a coated steel sheet having excellent corrosion resistance and fingerprint resistance, which is characterized by having a film coated with a top-coat paint of 1 / 0.5.
【０００８】また、本発明の第２の発明は、冷延鋼板の
少なくとも一方の面に、リン酸塩皮膜またはクロメート
皮膜を有し、その上に基体樹脂、亜鉛末およびクロム系
防錆顔料からなり、基体樹脂と、亜鉛末およびクロム系
防錆顔料の両者との重量比が、基体樹脂／（亜鉛末＋ク
ロム系防錆顔料）＝１／１〜１／９であり、かつクロム
系防錆顔料と亜鉛末との重量比がクロム系防錆顔料／亜
鉛末＝０．０２／１〜０．２／１である下塗り塗料を塗
装した膜を有し、さらにその上にシリカを含有した樹脂
からなり、樹脂とシリカとの重量比が樹脂／シリカ＝１
／０．０５〜１／０．５である上塗り塗料を塗装した膜
を有することを特徴とする耐食性、耐指紋性に優れた塗
装鋼板である。The second invention of the present invention has a phosphate coating or a chromate coating on at least one surface of a cold-rolled steel sheet, on which a base resin, zinc dust and a chromium-based rust preventive pigment are formed. The weight ratio of the base resin to both the zinc powder and the chromium-based rust preventive pigment is base resin / (zinc powder + chrome-based rust preventive pigment) = 1/1 to 1/9, and It has a film coated with an undercoat paint in which the weight ratio of rust pigment and zinc dust is chromium-based rust preventive pigment / zinc dust = 0.02 / 1 to 0.2 / 1, and further contains silica on it. It is made of resin, and the weight ratio of resin and silica is resin / silica = 1.
It is a coated steel sheet having excellent corrosion resistance and fingerprint resistance, which is characterized by having a film coated with a top coating composition of /0.05 to 1 / 0.5.
【０００９】本発明の第１の発明および第２の発明にお
いては、前記下塗り塗料の基体樹脂が、エポキシ樹脂、
ポリエステル樹脂、アクリル樹脂、およびウレタン樹脂
から選ばれる１種または２種以上であることが好まし
く、また、前記上塗り塗料の樹脂が、ポリエステル樹
脂、アクリル樹脂、アルキド樹脂、エポキシ樹脂、フェ
ノール樹脂、ポリウレタン樹脂、フッ素樹脂、およびこ
れらの樹脂の他の樹脂による変性誘導体から選ばれる１
種または２種以上であることが好ましく、また、下塗り
塗料および／または上塗り塗料に、さらにメラミン樹
脂、尿素樹脂、ブロックイソシアネート樹脂、およびベ
ンゾグアナミン樹脂から選ばれる１種または２種以上の
硬化剤を含有することが好ましい。In the first invention and the second invention of the present invention, the base resin of the undercoat paint is an epoxy resin,
One or more selected from polyester resins, acrylic resins, and urethane resins are preferable, and the resin of the above-mentioned top coating material is polyester resin, acrylic resin, alkyd resin, epoxy resin, phenol resin, polyurethane resin. , Fluororesins, and modified derivatives of these resins with other resins 1
It is preferable that one kind or two or more kinds, and the undercoat paint and / or the topcoat paint further contains one or more kinds of curing agents selected from melamine resin, urea resin, blocked isocyanate resin, and benzoguanamine resin. Preferably.
【００１０】さらに、本発明の第１の発明および第２の
発明においては、前記リン酸塩皮膜の付着量が鋼板片面
当たり０．３〜２．０ｇ／ｍ2 であり、クロメート皮膜
の付着量が鋼板片面当たり５〜１００ｍｇ／ｍ2 であ
り、下塗り塗料の膜厚が３〜１５μｍであり、上塗り塗
料の膜厚が０．３〜３μｍであることが好ましい。Further, in the first invention and the second invention of the present invention, the amount of the phosphate film adhered is 0.3 to 2.0 g / m 2 per one side of the steel sheet, and the amount of the chromate film adhered. Is 5 to 100 mg / m 2 per one side of the steel sheet, the thickness of the undercoat paint is 3 to 15 μm, and the thickness of the topcoat paint is preferably 0.3 to 3 μm.
【００１１】[0011]
【作用】本発明者らは、前記した従来の問題点を解決す
べく鋭意検討した結果、下塗り塗料中の亜鉛末の犠牲防
食作用、クロム系防錆顔料の不動態化作用により冷延鋼
板の耐食性を向上させると同時に、さらにその上に亜鉛
末塗料の耐傷付き性を改善させる目的でシリカを添加し
た樹脂層を形成させるという基本的な着想により問題を
解決するに至った。The inventors of the present invention have conducted extensive studies to solve the above-mentioned conventional problems, and as a result, sacrificial anticorrosive action of zinc powder in the undercoat paint and passivation action of the chromium-based rust-preventive pigment have resulted in The problem has been solved by the basic idea of forming a resin layer containing silica for the purpose of improving the corrosion resistance and, at the same time, further improving the scratch resistance of the zinc dust coating.
【００１２】以下に本発明について詳細に述べる。出発
素材は、冷延鋼板とし、この上に鋼板と下塗り塗料との
密着性向上の目的でリン酸塩皮膜またはクロメート皮膜
を形成する。リン酸塩皮膜としてはリン酸亜鉛、リン酸
鉄等通常のものが用いられる。リン酸塩皮膜の付着量と
しては、特に限定しないが、鋼板片面当たり０．３〜
２．０ｇ／ｍ2 が好ましい。０．３ｇ／ｍ2 未満では、
下塗りと鋼板との密着性が不十分なため、加工部の塗膜
剥離や腐食環境下での塗膜ふくれが生じやすい。また
２．０ｇ／ｍ2 超えでは、下塗りと鋼板との密着性は十
分に維持されるもののリン酸塩皮膜が電気絶縁性である
ことから、亜鉛等の犠牲防食電流が冷延鋼板に作用しに
くく赤錆抑制の効果が不十分になること、また、これら
の製品に要求される溶接性も低下するので好ましくな
い。さらに、加工時にリン酸塩皮膜層にクラックが入り
これが下塗り、上塗りの加工性にも悪影響を及ぼし好ま
しくない。The present invention will be described in detail below. A cold rolled steel sheet is used as a starting material, and a phosphate coating or a chromate coating is formed on the cold rolled steel sheet for the purpose of improving the adhesion between the steel sheet and the undercoat paint. As the phosphate coating, usual ones such as zinc phosphate and iron phosphate are used. The amount of the phosphate coating adhered is not particularly limited, but is 0.3 to 0.3
2.0 g / m 2 is preferred. Below 0.3 g / m 2 ,
Since the adhesion between the undercoat and the steel sheet is insufficient, the coating film peels off in the processed part and the coating film swells in a corrosive environment. If it exceeds 2.0 g / m 2 , the adhesion between the undercoat and the steel sheet is sufficiently maintained, but since the phosphate film is electrically insulating, sacrificial corrosion current such as zinc acts on the cold rolled steel sheet. It is not preferable because the effect of suppressing red rust becomes insufficient, and the weldability required for these products also deteriorates. Further, the phosphate coating layer is cracked during processing, which adversely affects the workability of the undercoat and topcoat, which is not preferable.
【００１３】一方、クロメートの付着量も特に限定しな
いが、鋼板片面当たり５〜１００ｍｇ／ｍ2 が好まし
い。５ｍｇ／ｍ2 未満では、やはり下塗りと鋼板との密
着性が不十分なため、加工部の塗膜剥離、腐食環境下で
の塗膜ふくれが生じやすく、１００ｍｇ／ｍ2 超えで
は、やはりクロメート層の電気絶縁性のため、下塗り塗
料中の亜鉛末の犠牲防食電流が冷延鋼板に作用しにくく
なり赤錆抑制効果が不十分となること、また溶接性も低
下するので好ましくない。適用できるクロメートとして
は、反応型、塗布型、電解型いずれでもかまわない。On the other hand, the amount of chromate deposited is not particularly limited, but is preferably 5 to 100 mg / m 2 per one side of the steel sheet. If it is less than 5 mg / m 2 , the adhesion between the undercoat and the steel sheet is still insufficient, so that the coating film peels off easily in the processed part and the coating film swells in a corrosive environment. If it exceeds 100 mg / m 2 , the chromate layer still remains. Due to the electric insulation property, the sacrificial anticorrosion current of zinc powder in the undercoating is less likely to act on the cold-rolled steel sheet, the effect of suppressing red rust becomes insufficient, and the weldability also deteriorates, which is not preferable. The applicable chromate may be any of reactive type, coating type and electrolytic type.
【００１４】次に、本発明の第１の発明においては、亜
鉛末を含む下塗り塗料を塗装する。この場合、下塗り塗
料に含まれる亜鉛末の量は、重量比で樹脂／亜鉛末＝１
／１〜１／９の範囲が好ましい。樹脂量に対する亜鉛末
量が少なく、樹脂／亜鉛末＞１／１の場合は、亜鉛の犠
牲防食作用による赤錆抑制効果が不十分であり、また下
塗り塗装の電気絶縁性が高くなり、溶接性が低下し好ま
しくない。樹脂量に対する亜鉛末量が過剰で、樹脂／亜
鉛末＜１／９の場合は、下塗り塗料の加工性が著しく低
下し、加工時に容易に塗膜剥離等が生じ、やはり好まし
くない。Next, in the first aspect of the present invention, an undercoat paint containing zinc dust is applied. In this case, the amount of zinc dust contained in the undercoat paint is resin / zinc dust = 1 by weight ratio.
The range of / 1-1 / 9 is preferable. When the amount of zinc dust relative to the amount of resin is small and resin / zinc dust> 1/1, the sacrificial anticorrosion effect of zinc is insufficient in the effect of suppressing red rust, and the electrical insulation of the undercoating is high and the weldability is high. It is not preferable because it decreases. When the amount of zinc dust relative to the amount of resin is excessive and resin / zinc dust is <1/9, the workability of the undercoat paint is remarkably reduced, and the coating film is easily peeled off during processing, which is also not preferable.
【００１５】また、本発明の第２の発明においては、亜
鉛末およびクロム系防錆顔料を含む下塗り塗料を塗装す
る。下塗り塗料に含まれる亜鉛末、クロム系防錆顔料の
量は、重量比で樹脂／（亜鉛末＋クロム系防錆顔料）＝
１／１〜１／９の範囲が好ましい。樹脂量に対する、亜
鉛末およびクロム系防錆顔料の量が少なく、樹脂／（亜
鉛末＋クロム系防錆顔料）＞１／１の場合は、亜鉛の犠
牲防食作用およびクロム系防錆顔料の不動態化作用によ
る赤錆抑制効果が不十分であり、また下塗り塗料の電気
絶縁性が高くなり、溶接性が低下し好ましくない。樹脂
量に対する、亜鉛末およびクロム系防錆顔料の量が過剰
で、樹脂／（亜鉛末＋クロム系防錆顔料）＜１／９の場
合は、下塗り塗料の加工性が著しく低下し、加工時に容
易に塗膜剥離等が生じ、やはり好ましくない。また、ク
ロム系防錆顔料／亜鉛末の重量比は０．０２／１〜０．
２／１の範囲が好ましい。In the second aspect of the present invention, an undercoat paint containing zinc dust and a chromium anticorrosive pigment is applied. The amount of zinc dust and chromium-based rust preventive pigment contained in the undercoat paint is resin / (zinc dust + chromium-based rust preventive pigment) by weight ratio =
The range of 1/1 to 1/9 is preferable. When the amount of zinc dust and chromium-based rust preventive pigment is small relative to the amount of resin and resin / (zinc dust + chrome-based rust preventive pigment)> 1/1, the sacrificial anticorrosive action of zinc and the absence of chromium-based rust preventive pigment The red rust suppressing effect due to the activating action is insufficient, and the electric insulation of the undercoating material becomes high, which deteriorates the weldability, which is not preferable. When the amount of zinc dust and chromium-based rust preventive pigment is excessive with respect to the amount of resin and resin / (zinc dust + chrome-based rust preventive pigment) <1/9, the workability of the undercoat paint is significantly reduced and The coating film peels off easily, which is also undesirable. Further, the weight ratio of chromium-based rust preventive pigment / zinc dust is 0.02 / 1 to 0.
The range of 2/1 is preferable.
【００１６】クロム系防錆顔料の量が、クロム系防錆顔
料／亜鉛末＜０．０２／１と少なければクロム系防錆顔
料の不動態化作用が小さくなり、またクロム系防錆顔料
／亜鉛末＞０．２／１と多ければ、亜鉛末の量が相対的
に少なくなるため、亜鉛の犠牲防食作用が小さくなるだ
けでなく、下塗りの電気絶縁性が高くなり、溶接性も悪
くなり、好ましくない。When the amount of the chromium-based anticorrosion pigment is as small as chromium-based anticorrosion pigment / zinc powder <0.02 / 1, the passivation effect of the chromium-based anticorrosion pigment is small, and the chromium-based antirust pigment / If the amount of zinc dust is larger than 0.2 / 1, the amount of zinc dust is relatively small, so not only the sacrificial anticorrosive action of zinc is reduced, but also the electrical insulation of the undercoat is increased and the weldability is deteriorated. , Not preferable.
【００１７】クロム系防錆顔料としては、ストロンチュ
ームクロメート、ジンククロメート、カルシウムクロメ
ート等が有効である。下塗り塗料中の樹脂成分として
は、ポリエステル樹脂、アクリル樹脂、エポキシ樹脂、
ウレタン樹脂等特に限定はしないが、耐食性、および上
塗り塗膜との密着性の観点からエポキシ樹脂がもっとも
好ましい。なお、エポキシ樹脂としては、高分子量のビ
スフェノールＡ型エポキシ樹脂が好ましいが、これを加
工性、密着性改善の目的で、ポリエステル、ウレタン、
脂肪酸等で変成したものでもかまわない。さらに、必要
に応じて硬化剤を使用してもよい。使用する硬化剤とし
ては、メラミン、ブロックイソシアネート、尿素樹脂、
ベンゾグアナミン等が挙げられる。また、樹脂と硬化剤
の反応性を高めるため、必要に応じて触媒を用いても良
い。これら下塗り層の膜厚としては３〜１５μｍが好ま
しく、特に５〜１０μｍが好適である。３μｍ未満では
十分な耐食性が得られず、１５μｍ超えでは耐食性が十
分なものの、加工性が劣化し好ましくない。As chromium-based rust preventive pigments, strontium chromate, zinc chromate, calcium chromate and the like are effective. As the resin component in the undercoat paint, polyester resin, acrylic resin, epoxy resin,
The urethane resin and the like are not particularly limited, but the epoxy resin is most preferable from the viewpoint of corrosion resistance and adhesion with the top coating film. As the epoxy resin, a high molecular weight bisphenol A type epoxy resin is preferable, but for the purpose of improving processability and adhesion, polyester, urethane,
It may be modified with fatty acid. Further, a curing agent may be used if necessary. As the curing agent used, melamine, blocked isocyanate, urea resin,
Examples thereof include benzoguanamine. Further, a catalyst may be used if necessary in order to enhance the reactivity between the resin and the curing agent. The thickness of these undercoat layers is preferably 3 to 15 μm, and particularly preferably 5 to 10 μm. If it is less than 3 μm, sufficient corrosion resistance cannot be obtained, and if it exceeds 15 μm, corrosion resistance is sufficient, but workability deteriorates, which is not preferable.
【００１８】さらに、この下塗り層の上に亜鉛末塗料表
面の耐傷付き性を改善するためにシリカ入りの上塗り層
を形成する。塗膜の表面硬度を高めるため、および耐食
性の観点からシリカを添加するわけであるが、シリカの
添加量としては、樹脂とシリカとの重量比が樹脂／シリ
カ＝１／０．０５〜１／０．５の範囲が好ましい。シリ
カの添加量が、樹脂／シリカ＞１／０．０５と少なけれ
ば、上塗り塗膜の硬度が十分でなく耐傷付き性が不十分
となり好ましくない。また、シリカの添加量が樹脂／シ
リカ＜１／０．５と多ければ、塗膜の硬度は十分になる
ものの加工性が低下し、やはり好ましくない。Further, a silica-containing topcoat layer is formed on the undercoat layer in order to improve the scratch resistance of the zinc dust coating surface. Silica is added in order to increase the surface hardness of the coating film and from the viewpoint of corrosion resistance. As the addition amount of silica, the weight ratio of resin to silica is resin / silica = 1 / 0.05 to 1 / A range of 0.5 is preferred. If the amount of silica added is as small as resin / silica> 1 / 0.05, the hardness of the top coating film is not sufficient and the scratch resistance is insufficient, which is not preferable. Further, if the amount of silica added is as large as resin / silica <1 / 0.5, the hardness of the coating film is sufficient, but the workability is deteriorated, which is also undesirable.
【００１９】使用されるシリカとしては、気相シリカ、
湿式シリカ、コロイダルシリカいずれでもよい。上塗り
に使用される樹脂は特に限定しないが表面硬度を考慮す
るとアクリル系樹脂が好ましい。上塗り層の膜厚として
は０．３〜３μｍが好ましく、特に０．５〜２μｍが好
適である。膜厚が０．３μｍ未満では十分な表面硬度が
得られず、耐傷付き性が不十分となる。また３μｍを超
えると、耐傷付き性、耐食性は十分となるが上塗りによ
る電気絶縁性が大きくなり、その結果溶接性の低下を招
き好ましくない。これらの上塗り塗料には、必要に応じ
て、たとえば、メラミン、ベンゾグアナミン、ブロック
イソシアネート、尿素樹脂等が添加される。The silica used is gas phase silica,
Either wet silica or colloidal silica may be used. The resin used for the overcoat is not particularly limited, but an acrylic resin is preferable in consideration of the surface hardness. The thickness of the overcoat layer is preferably 0.3 to 3 μm, and particularly preferably 0.5 to 2 μm. If the film thickness is less than 0.3 μm, sufficient surface hardness cannot be obtained and scratch resistance becomes insufficient. On the other hand, when it exceeds 3 μm, the scratch resistance and the corrosion resistance are sufficient, but the electric insulation by the overcoating becomes large, and as a result, the weldability deteriorates, which is not preferable. If necessary, for example, melamine, benzoguanamine, blocked isocyanate, urea resin, etc. are added to these top-coat paints.
【００２０】上塗りおよび下塗りの塗装方法としては、
たとえばナチュラルコート、リバースロールコート、カ
ーテンフローコート等通常の方法で行うことができる。
硬化方法としては、熱、電子熱、紫外線、赤外線、遠赤
外線のいずれでも良い。以上のように、本発明は冷延鋼
板の上にリン酸塩皮膜またはクロメート皮膜形成後、亜
鉛末量を適正化した下塗り塗膜を形成後、さらにその上
に適正量のシリカを含有した上塗り塗装を施すことで耐
食性、耐指紋性、加工性、表面硬度、溶接性等に優れ、
かつ安価な塗装鋼板を得ることができる。As the coating method of the top coat and the undercoat,
For example, natural coating, reverse roll coating, curtain flow coating and the like can be used.
The curing method may be heat, electron heat, ultraviolet rays, infrared rays, or far infrared rays. As described above, the present invention, after forming a phosphate film or a chromate film on a cold-rolled steel sheet, after forming an undercoating film with a proper amount of zinc powder, further topcoat containing a proper amount of silica on it By applying a coating, it has excellent corrosion resistance, fingerprint resistance, workability, surface hardness, weldability, etc.
Moreover, an inexpensive coated steel sheet can be obtained.
【００２１】[0021]
【実施例】本発明の実施例および比較例を以下に説明す
る。 （実施例１〜３１）、（比較例１〜１２）まず実施例１
について説明する。０．５ｍｍ厚の冷延鋼板を脱脂後、
付着量が２０ｍｇ／ｍ2 のクロメート皮膜を形成した。EXAMPLES Examples and comparative examples of the present invention will be described below. (Examples 1 to 31), (Comparative Examples 1 to 12) First, Example 1
Will be described. After degreasing the cold rolled steel sheet with a thickness of 0.5 mm,
A chromate film having an adhesion amount of 20 mg / m 2 was formed.
【００２２】得られた鋼板の上にエポキシ樹脂と亜鉛末
を、エポキシ樹脂／亜鉛末＝１／８の重量比で含有する
塗料を、乾燥膜厚で５μｍになるよう塗装、焼き付け
し、さらにその上にアクリル樹脂とコロイダルシリカ
を、アクリル樹脂／コロイダルシリカ＝１／０．１の重
量比で含有する塗料を乾燥膜厚で１μｍとなるように塗
装、焼き付けした。A paint containing an epoxy resin and zinc dust in a weight ratio of epoxy resin / zinc dust = 1/8 was coated and baked on the obtained steel sheet to a dry film thickness of 5 μm, A coating material containing an acrylic resin and colloidal silica at a weight ratio of acrylic resin / colloidal silica = 1 / 0.1 was applied and baked to a dry film thickness of 1 μm.
【００２３】なお、エポキシ樹脂としては、油化シェル
株式会社製エピコート１０１０（分子量５５００）を、
アクリル樹脂としては、三菱レーヨン株式会社製ダイヤ
ナールＢＲ−７３（分子量：８５０００、Ｔｇ＝１００
℃）を、コロイダルシリカとしては、日産化学工業株式
会社製オルガノシリカゾルＥＧ−ＳＴを用いた。このよ
うにして得られた塗装鋼板の耐食性、加工性、表面硬
度、溶接性、耐指紋性の評価結果を表２に示す。As the epoxy resin, Epicoat 1010 (molecular weight 5500) manufactured by Yuka Shell Co., Ltd.
As the acrylic resin, DIANAL BR-73 manufactured by Mitsubishi Rayon Co., Ltd. (molecular weight: 85,000, Tg = 100)
C) was used as the colloidal silica, organosilica sol EG-ST manufactured by Nissan Chemical Industries, Ltd. Table 2 shows the evaluation results of the corrosion resistance, workability, surface hardness, weldability, and fingerprint resistance of the coated steel sheet thus obtained.
【００２４】さらに前処理、下塗り塗装、上塗り塗装の
条件を変えた以外は実施例１と同様にして作成した塗装
鋼板の前処理、下塗り塗料、上塗り塗料の組成、および
得られた塗装鋼板の評価結果を表１、表２に示す。（実
施例２〜３１）また、本発明における好適範囲外の比較
例についても同様に表１、表２に示した。Further, the pretreatment of the coated steel sheet prepared in the same manner as in Example 1 except that the conditions of pretreatment, undercoat coating and topcoat coating were changed, the composition of the undercoat paint, the topcoat paint, and the evaluation of the obtained coated steel plate. The results are shown in Tables 1 and 2. (Examples 2 to 31) Further, Tables 1 and 2 also show Comparative Examples outside the preferred range of the present invention.
【００２５】なお、耐食性、加工性、表面硬度、溶接
性、耐指紋性の評価方法は次の通りである。 （耐食性）素地鋼板に達するクロスカットを描いて塗膜
に傷を付けた後、塩水噴霧試験を１２０時間行い、クロ
スカット部からの塗膜の最大剥離幅および赤錆発生状況
で評価した。評価は次の基準で評価した。The evaluation methods of corrosion resistance, workability, surface hardness, weldability, and fingerprint resistance are as follows. (Corrosion resistance) After drawing a cross cut reaching the base steel sheet to scratch the coating film, a salt spray test was performed for 120 hours, and evaluation was made based on the maximum peeling width of the coating film from the cross cut portion and the state of occurrence of red rust. The evaluation was made according to the following criteria.
【００２６】最大剥離幅 ◎：ふくれ全くなし ○：片側ふくれ巾１ｍｍ以下 △：片側ふくれ巾１ｍｍ超え〜５ｍｍ未満 ×：片側ふくれ巾５ｍｍ以上 赤錆発生状況 ○：赤錆発生なし △：一部赤錆発生 ×：著しい赤錆発生 （加工性）簡易プレス機にて９０度曲げを行った後、曲
げ部にセロハンテープを密着させたあと剥離した。その
ときの、曲げ部の塗膜の剥離状態を以下の基準で３段階
評価した。Maximum peeling width ◎: No blistering ○: Bulging width on one side is 1 mm or less △: Blistering width on one side is more than 1 mm and less than 5 mm ×: Blistering width on one side is 5 mm or more Red rust occurs ○: Red rust does not occur Δ: Partial red rust occurs × : Remarkable red rust generation (workability) After 90-degree bending with a simple press machine, cellophane tape was adhered to the bent portion and then peeled off. At that time, the peeled state of the coating film on the bent portion was evaluated on the basis of the following three criteria.
【００２７】塗膜の剥離状況 ○：剥離が全くみられな
い △：一部に塗膜剥離発生 ×：塗膜の全面剥離 （表面硬度）三菱鉛筆社製三菱ユニを用い、傷つき法に
て評価した。評価は傷がつかない限界の鉛筆の硬度で示
した。Peeling status of coating film: No peeling was observed. Δ: Partial peeling of coating film was observed. ×: Total peeling of coating film (surface hardness). Evaluation was made by a scratch method using Mitsubishi Uni manufactured by Mitsubishi Pencil Co., Ltd. did. The evaluation is indicated by the pencil hardness which is the limit of scratching.
【００２８】（耐指紋性）人工指紋液を付着させ、その
変色度を目視判定し下記の基準で３段階評価した。 変色度 ○：全く痕跡なし △：わずかに痕跡有り ×：著しい痕跡有り （溶接性）スポット溶接試験機を使用して、先端径５．
０ｍｍの電極により、溶接電流８．５ｋＡ、通電時間１
０サイクル、加圧荷重２００ｋｇの条件において、冷延
鋼板と塗装鋼板試験片のスポット溶接を行った。溶接性
は次の基準で評価した。(Anti-fingerprint resistance) An artificial fingerprint liquid was adhered, and the degree of discoloration was visually judged and evaluated according to the following criteria in three grades. Discoloration degree ○: No trace at all △: Slight traces ×: Significant trace (weldability) Using a spot welding tester, tip diameter 5.
With 0 mm electrode, welding current is 8.5 kA, energization time is 1
Spot welding of a cold-rolled steel plate and a coated steel plate test piece was performed under the conditions of 0 cycle and a pressure load of 200 kg. Weldability was evaluated according to the following criteria.
【００２９】溶接性評価基準 ○：溶接後にちりがない △：溶接が可能である ×：未溶接があるか、溶接不能である場合Criteria for evaluating weldability ○: No dust after welding △: Welding is possible ×: Unwelded or unweldable
【００３０】[0030]
【表１】 [Table 1]
【００３１】[0031]
【表２】 [Table 2]
【００３２】[0032]
【表３】 [Table 3]
【００３３】（実施例３２〜６２）、（比較例１３〜２
５）まず実施例３２について説明する。０．５ｍｍ厚の
冷延鋼板を脱脂後、付着量が２０ｍｇ／ｍ2 のクロメー
ト皮膜を形成した。得られた鋼板の上にエポキシ樹脂と
亜鉛末およびストロンチュームクロメートを、エポキシ
樹脂／（亜鉛末＋ストロンチュームクロメート）＝１／
８の重量比で含有する塗料を乾燥膜厚で５μｍになるよ
う塗装、焼き付けし、さらにその上にアクリル樹脂とコ
ロイダルシリカを、アクリル樹脂／コロイダルシリカ＝
１／０．１の重量比で含有する塗料を乾燥膜厚で１μｍ
となるように塗装、焼き付けした。なお、エポキシ樹
脂、アクリル樹脂、コロイダルシリカは実施例１と同じ
ものを用いた。(Examples 32 to 62), (Comparative Examples 13 to 2)
5) First, Example 32 will be described. After degreasing a 0.5 mm-thick cold rolled steel sheet, a chromate film having an adhesion amount of 20 mg / m 2 was formed. Epoxy resin, zinc dust and strontium chromate on the obtained steel plate, epoxy resin / (zinc dust + strontium chromate) = 1 /
The coating material contained in a weight ratio of 8 is coated and baked so that the dry film thickness becomes 5 μm, and acrylic resin and colloidal silica are further added thereon, and acrylic resin / colloidal silica =
Paint containing 1 / 0.1 weight ratio as dry film thickness 1μm
It was painted and baked so that The same epoxy resin, acrylic resin and colloidal silica as in Example 1 were used.
【００３４】このようにして得られた塗装鋼板の耐食
性、加工性、表面硬度、溶接性、耐指紋性の評価結果を
表４に示す。さらに前処理、下塗り塗装、上塗り塗装の
条件を変えた以外は実施例３２と同様にして作成した塗
装鋼板の前処理、下塗り塗料、上塗り塗料の組成、およ
び得られた塗装鋼板の評価結果を表３、表４に示す。
（実施例３３〜６２）また、本発明における好適範囲外
の比較例についても同様に表３、表４に示した。Table 4 shows the evaluation results of the corrosion resistance, workability, surface hardness, weldability, and fingerprint resistance of the coated steel sheet thus obtained. Furthermore, the pretreatment of the coated steel sheet prepared in the same manner as in Example 32 except that the conditions of the pretreatment, the undercoat coating, and the topcoat coating were changed, the composition of the undercoat paint, the topcoat paint, and the evaluation results of the obtained coated steel sheet are shown. 3, shown in Table 4.
(Examples 33 to 62) Also, Comparative Examples outside the preferred range of the present invention are also shown in Tables 3 and 4.
【００３５】なお、耐食性、加工性、表面硬度、溶接
性、耐指紋性の評価は実施例１と同様にして行った。The corrosion resistance, workability, surface hardness, weldability, and fingerprint resistance were evaluated in the same manner as in Example 1.
【００３６】[0036]
【表４】 [Table 4]
【００３７】[0037]
【表５】 [Table 5]
【００３８】[0038]
【表６】 [Table 6]
【００３９】[0039]
【発明の効果】以上説明したように、本発明の塗装鋼板
は、冷延鋼板を素材としながらも優れた耐食性を有し、
また加工性、耐傷つき性、耐指紋性、溶接性にも優れた
品質を有する。As described above, the coated steel sheet of the present invention has excellent corrosion resistance even though it is made of cold rolled steel sheet.
It also has excellent workability, scratch resistance, fingerprint resistance, and weldability.
Claims (6)
酸塩皮膜またはクロメート皮膜を有し、その上に基体樹
脂および亜鉛末からなり、基体樹脂と亜鉛末との重量比
が基体樹脂／亜鉛末＝１／１〜１／９である下塗り塗料
を塗装した膜を有し、さらにその上にシリカを含有した
樹脂からなり、樹脂とシリカとの重量比が樹脂／シリカ
＝１／０．０５〜１／０．５である上塗り塗料を塗装し
た膜を有することを特徴とする耐食性、耐指紋性に優れ
た塗装鋼板。1. A cold-rolled steel sheet having a phosphate coating or a chromate coating on at least one surface thereof, which comprises a base resin and zinc dust, and a weight ratio of the base resin to the zinc dust is base resin / It has a film coated with an undercoat paint in which zinc dust is 1/1 to 1/9, and further comprises a resin containing silica thereon, and the weight ratio of resin to silica is resin / silica = 1/0. A coated steel sheet having excellent corrosion resistance and fingerprint resistance, characterized by having a film coated with a top coating material having a thickness of 05 to 1 / 0.5.
酸塩皮膜またはクロメート皮膜を有し、その上に基体樹
脂、亜鉛末およびクロム系防錆顔料からなり、基体樹脂
と、亜鉛末およびクロム系防錆顔料の両者との重量比
が、基体樹脂／（亜鉛末＋クロム系防錆顔料）＝１／１
〜１／９であり、かつクロム系防錆顔料と亜鉛末との重
量比がクロム系防錆顔料／亜鉛末＝０．０２／１〜０．
２／１である下塗り塗料を塗装した膜を有し、さらにそ
の上にシリカを含有した樹脂からなり、樹脂とシリカと
の重量比が樹脂／シリカ＝１／０．０５〜１／０．５で
ある上塗り塗料を塗装した膜を有することを特徴とする
耐食性、耐指紋性に優れた塗装鋼板。2. A cold rolled steel sheet having a phosphate coating or a chromate coating on at least one surface thereof, which comprises a base resin, zinc dust and a chromium-based rust preventive pigment. The weight ratio of both the chromium-based rust preventive pigment is base resin / (zinc dust + chrome-based rust preventive pigment) = 1/1
.About.1 / 9, and the weight ratio of the chromium-based rust preventive pigment and the zinc powder is chromium-based rust preventive pigment / zinc powder = 0.02 / 1 to 0.
It has a film coated with an undercoat paint of 2/1, and further comprises a resin containing silica thereon, and the weight ratio of resin to silica is resin / silica = 1 / 0.05 to 1 / 0.5 A coated steel sheet having excellent corrosion resistance and fingerprint resistance, which is characterized by having a film coated with the above-mentioned topcoat paint.
脂、ポリエステル樹脂、アクリル樹脂、およびウレタン
樹脂から選ばれる１種または２種以上である請求項１ま
たは２に記載の耐食性、耐指紋性に優れた塗装鋼板。3. The base resin of the undercoat paint is one or more selected from an epoxy resin, a polyester resin, an acrylic resin, and a urethane resin, and is excellent in corrosion resistance and fingerprint resistance. Painted steel sheet.
脂、アクリル樹脂、アルキド樹脂、エポキシ樹脂、フェ
ノール樹脂、ポリウレタン樹脂、フッ素樹脂、およびこ
れらの樹脂の他の樹脂による変性誘導体から選ばれる１
種または２種以上である請求項１〜３いずれかに記載の
耐食性、耐指紋性に優れた塗装鋼板。4. The resin of the top coating is selected from polyester resin, acrylic resin, alkyd resin, epoxy resin, phenol resin, polyurethane resin, fluororesin, and modified derivatives of these resins with other resins.
The coated steel sheet excellent in corrosion resistance and fingerprint resistance according to any one of claims 1 to 3, which is one kind or two or more kinds.
さらに、メラミン樹脂、尿素樹脂、ブロックイソシアネ
ート樹脂、およびベンゾグアナミン樹脂から選ばれる１
種または２種以上の硬化剤を含有してなる請求項１〜４
いずれかに記載の耐食性、耐指紋性に優れた塗装鋼板。5. The undercoating paint and / or the topcoating paint, further selected from a melamine resin, a urea resin, a blocked isocyanate resin, and a benzoguanamine resin.
One or two or more curing agents are contained.
A coated steel sheet having excellent corrosion resistance and fingerprint resistance according to any one of the above.
０．３〜２．０ｇ／ｍ2 であり、クロメート皮膜の付着
量が鋼板片面当たり５〜１００ｍｇ／ｍ2 であり、下塗
り塗料の膜厚が３〜１５μｍであり、上塗り塗料の膜厚
が０．３〜３μｍである請求項１〜５いずれかに記載の
耐食性、耐指紋性に優れた塗装鋼板。6. The amount of the phosphate coating adhered per one side of the steel sheet is 0.3 to 2.0 g / m 2 , and the amount of the chromate coating adhered per one side of the steel sheet is 5 to 100 mg / m 2 , The coated steel sheet having excellent corrosion resistance and fingerprint resistance according to any one of claims 1 to 5, wherein the coating film has a film thickness of 3 to 15 µm and the top coating composition has a film thickness of 0.3 to 3 µm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7387995A JPH08267655A (en) | 1995-03-30 | 1995-03-30 | Pre-coated steel sheet excellent in corrosion resistance and fingerprint resistance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7387995A JPH08267655A (en) | 1995-03-30 | 1995-03-30 | Pre-coated steel sheet excellent in corrosion resistance and fingerprint resistance |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH08267655A true JPH08267655A (en) | 1996-10-15 |
Family
ID=13530939
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7387995A Pending JPH08267655A (en) | 1995-03-30 | 1995-03-30 | Pre-coated steel sheet excellent in corrosion resistance and fingerprint resistance |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH08267655A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001123121A (en) * | 1999-10-28 | 2001-05-08 | Kawasaki Steel Corp | Surface-treated steel plate excellent in processability and weather resistance |
| JP2006281186A (en) * | 2005-03-31 | 2006-10-19 | Sumitomo Metal Ind Ltd | Method for rustproofing steel |
| KR100772764B1 (en) * | 2005-11-02 | 2007-11-01 | 에스에스씨피 주식회사 | Multi coated layers for electronic appliance or mobile phone and method for the formation thereof |
| JP2011508689A (en) * | 2007-12-27 | 2011-03-17 | ポスコ | Steel sheet and steel sheet surface treatment composition |
-
1995
- 1995-03-30 JP JP7387995A patent/JPH08267655A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001123121A (en) * | 1999-10-28 | 2001-05-08 | Kawasaki Steel Corp | Surface-treated steel plate excellent in processability and weather resistance |
| JP4665272B2 (en) * | 1999-10-28 | 2011-04-06 | Ｊｆｅスチール株式会社 | Surface-treated steel sheet with excellent workability and weather resistance |
| JP2006281186A (en) * | 2005-03-31 | 2006-10-19 | Sumitomo Metal Ind Ltd | Method for rustproofing steel |
| KR100772764B1 (en) * | 2005-11-02 | 2007-11-01 | 에스에스씨피 주식회사 | Multi coated layers for electronic appliance or mobile phone and method for the formation thereof |
| JP2011508689A (en) * | 2007-12-27 | 2011-03-17 | ポスコ | Steel sheet and steel sheet surface treatment composition |
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