JP2006291279A - Electrically conductive black plated steel sheet - Google Patents
Electrically conductive black plated steel sheet Download PDFInfo
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本発明は、導電性を有する熱放射性に優れためっき鋼板に関する。 The present invention relates to a plated steel sheet having conductivity and excellent heat radiation.
家電製品や事務用機器などの外装材として用いられる鋼板において、美観上の観点から表面を黒色化した鋼板が求められ、さらに溶接性を有することも求められる。表面を黒色化し、溶接が可能な鋼板としては、主として亜鉛や亜鉛合金をめっきした鋼板上に、カーボンブラックなどの黒色顔料を含む樹脂皮膜を形成したものが用いらるが、黒色顔料を含む樹脂皮膜を形成することにより十分な黒色を発現させるためには黒色皮膜の厚さを大きくする必要があるが、皮膜厚さが大きくなると皮膜の導電性が低下して溶接が不可能になるという欠点があった。また、最近では家電製品や事務用機器においては、内部回路を保守する観点から、機器内部に発生する熱を放出させるために、外装用の鋼板として熱放射性に優れたものも求められるようになってきている。 In steel sheets used as exterior materials for home appliances and office equipment, steel sheets with a blackened surface are required from an aesthetic point of view, and it is also required to have weldability. As a steel sheet that can be blackened and welded, a steel film that is mainly plated with zinc or a zinc alloy and on which a resin film containing a black pigment such as carbon black is formed is used. It is necessary to increase the thickness of the black film in order to develop a sufficient black color by forming the film, but the disadvantage that if the film thickness increases, the film conductivity decreases and welding becomes impossible. was there. In recent years, home appliances and office equipment have been required to have excellent thermal radiation as a steel sheet for exterior use in order to release heat generated inside the equipment from the viewpoint of maintaining internal circuits. It is coming.
この欠点を補うために、特許文献１は、有機皮膜中にカーボンブラックと一定範囲の粒径を有する固形潤滑剤を含有させ、かつ有機皮膜の厚さと固形潤滑剤の平均粒径の比を一定範囲とした皮膜を亜鉛めっき鋼板や亜鉛系合金めっき鋼板に被覆することにより、一定範囲の明度Ｌ値を有するダークグレーの均一で美麗な外観を有する表面処理鋼板を提案している。 In order to compensate for this drawback, Patent Document 1 contains carbon black and a solid lubricant having a certain range of particle diameter in the organic film, and the ratio of the thickness of the organic film to the average particle diameter of the solid lubricant is constant. A surface-treated steel sheet having a uniform and beautiful appearance of dark gray having a certain range of lightness L values has been proposed by coating a galvanized steel sheet or a zinc-based alloy-plated steel sheet with a coating having a range.
また特許文献２は、Ｌ値が５６以下であるグレーの色調を有する合金亜鉛めっき鋼板などの金属板にカーボンブラックのみを含有する黒色皮膜を被覆した黒色金属板を提案している。しかしこれらの表面処理鋼板や黒色金属板は色調がグレーではあるものの、L値が高いため、所望の黒色度を得るためには亜鉛系合金めっき鋼板などの色調を隠蔽するために被覆する黒色皮膜の厚さをある程度まで厚くせざるを得ず、導電性が不十分となるので十分な溶接性を得ることができない。
本発明は、導電性を有するとともに熱放射性にも優れためっき鋼板を提供することを目的とする。 An object of this invention is to provide the plated steel plate which has electroconductivity and was excellent also in thermal radiation.
本発明者は、上記問題点を解決するために、黒色樹脂を被覆する原板である亜鉛めっき鋼板のめっき層を暗色化して黒色めっき鋼板とし、この黒色めっき鋼板に薄膜の黒色皮膜を被覆することにより、薄膜でも十分な黒色を呈して優れた導電性を示して溶接が可能であり、かつ放射率が高く優れた熱放射性を有する鋼板が得られることを見出し、本発明に到達したものである。
すなわち、上記目的を達成する本発明の導電性黒色めっき鋼板は、鋼板上に下から順に、亜鉛−コバルト−モリブデン合金めっき層または亜鉛−コバルト−タングステン合金めっき層、ジルコニウム系化成処理皮膜層、黒色顔料を含有する水系樹脂皮膜層を形成してなる、導電性黒色めっき鋼板（請求項１）であり、
上記（請求項１）の導電性黒色めっき鋼板において、前記亜鉛−コバルト−モリブデン合金めっき層または亜鉛−コバルト−タングステン合金めっき層のL＊値が５０以下であること（請求項２）を特徴とし、また
上記（請求項１または２）の導電性黒色めっき鋼板において、前記水系樹脂皮膜層がさらにシリカを含有すること（請求項３）を特徴とし、また
上記（請求項１〜３）のいずれか導電性黒色めっき鋼板において、前記黒色顔料が微細炭素質である（請求項４）を特徴とし、また
上記（請求項１〜４）のいずれかの導電性黒色めっき鋼板において、前記水系樹脂皮膜層の厚さが０．１〜１．２μｍであること（請求項５）を特徴とし、また
上記（請求項１〜５）のいずれかの導電性黒色めっき鋼板において、前記水系樹脂がディスパージョンタイプの水系樹脂を用いてなる水系ウレタン樹脂あること（請求項６）を特徴とし、また
上記（請求項１〜６）のいずれかの導電性黒色めっき鋼板において、 放射率が０．５以上であること（請求項７）を特徴とする。
In order to solve the above problems, the inventor darkens the plating layer of the galvanized steel sheet, which is the original sheet for coating the black resin, to form a black-plated steel sheet, and coats the black-plated steel sheet with a thin film of black film. Thus, the present inventors have found that a steel sheet exhibiting sufficient blackness and exhibiting excellent conductivity even in a thin film and capable of being welded and having high emissivity and excellent thermal radiation can be obtained. .
That is, the conductive black-plated steel sheet of the present invention that achieves the above-mentioned object is, in order from the bottom on the steel sheet, a zinc-cobalt-molybdenum alloy plating layer or a zinc-cobalt-tungsten alloy plating layer, a zirconium-based chemical conversion coating film layer, black A conductive black-plated steel sheet (Claim 1) formed by forming a water-based resin film layer containing a pigment,
In the conductive black-plated steel sheet of the above (Claim 1), the L * value of the zinc-cobalt-molybdenum alloy plating layer or the zinc-cobalt-tungsten alloy plating layer is 50 or less (Claim 2). In the conductive black-plated steel sheet of the above (Claim 1 or 2), the aqueous resin film layer further contains silica (Claim 3), and any of the above (Claims 1 to 3) In the conductive black-plated steel sheet, the black pigment is fine carbonaceous (Claim 4), and in the conductive black-plated steel sheet according to any one of the above (Claims 1 to 4), the water-based resin film The thickness of the layer is from 0.1 to 1.2 μm (Claim 5), and in the conductive black-plated steel sheet according to any one of the above (Claims 1 to 5), the water-based resin is dimmed. It is characterized in that it is a water-based urethane resin using a water-based resin of the type (Claim 6), and in the conductive black-plated steel sheet according to any one of the above (Claims 1 to 6), the emissivity is 0.5 or more (Claim 7).
本発明の導電性黒色めっき鋼板は、亜鉛めっき鋼板のめっき層を暗色化して黒色めっき鋼板とし、この黒色めっき鋼板に薄膜の黒色皮膜を被覆したものであり、黒色皮膜が薄いために優れた導電性を示し溶接が可能であり、また薄膜でも十分な黒色を呈するために放射率が高く優れた熱放射性を示す。 The conductive black-plated steel sheet of the present invention darkens the plating layer of a galvanized steel sheet to form a black-plated steel sheet, and this black-plated steel sheet is coated with a thin film of black film. It exhibits high thermal emissivity because of its high emissivity since it exhibits sufficient blackness and can be welded.
以下、本発明の内容を説明する。本発明においては溶接可能な優れた導電性を得るために、亜鉛めっき鋼板上に被覆する黒色皮膜を可能な限り薄膜化しつつ、十分な黒色を呈して優れた熱放射性を可能とすることを目的として、鋼板上にめっきする亜鉛めっき層を暗色化することにより、上記目的を達成した。すなわち、黒色皮膜を被覆する下地のめっき鋼板として、電気めっき法を用いて亜鉛−コバルト−モリブデン合金めっき層または亜鉛−コバルト−タングステン合金めっき層を被覆する際に、通常は光沢剤としてめっき浴中に含有させる有機物質を一定範囲の量で含有させためっき浴を用いてめっきすると、明度指数Ｌ＊値（以下、簡略にするため単にＬ＊値という）が５０以下である暗色のめっき皮膜が得られることを見出した。 The contents of the present invention will be described below. In the present invention, in order to obtain excellent electrical conductivity that can be welded, the objective is to make the black film coated on the galvanized steel sheet as thin as possible while exhibiting sufficient black color and excellent thermal radiation. As described above, the above-mentioned object was achieved by darkening the galvanized layer plated on the steel plate. That is, when a zinc-cobalt-molybdenum alloy plating layer or a zinc-cobalt-tungsten alloy plating layer is coated using an electroplating method as an underlying plated steel sheet for coating a black film, it is usually in a plating bath as a brightener. When plating is performed using a plating bath containing an organic substance to be contained in a certain range, a dark plating film having a brightness index L * value (hereinafter simply referred to as L * value) of 50 or less is obtained. It was found that it can be obtained.
亜鉛−コバルト−モリブデン合金めっき層または亜鉛−コバルト−タングステン合金めっき層を形成させるめっき浴としては、公知の硫酸亜鉛、硫酸コバルト、モリブデン酸アンモニウムまたはタングステン酸アンモニウムを含有する水溶液に、光沢剤として有機窒素化合物を含有させたものを用いる。これらのめっき浴を用いて鋼板上に亜鉛−コバルト−モリブデン合金めっき層または亜鉛−コバルト−タングステン合金めっき層を形成させると、めっき浴中の有機窒素化合物の含有量によってＬ＊値が異なるめっき皮膜が得られるが、本発明においてはＬ＊値が５０以下のめっき皮膜を有する暗色のめっき鋼板を下記に示す黒色皮膜を被覆する下地として用いる。Ｌ＊値が５０を超えると目的とする黒色および放熱性を得るためには黒色皮膜の厚さを厚くする必要があるが、皮膜が厚くなると導電性が不良となり溶接が不可能となる。めっき量としては３〜３０ｇ／ｍ２であることが好ましい。３ｇ／ｍ２未満ではめっき下地の鋼板の光沢面を十分に隠蔽できない。３０ｇ／ｍ２を超えると隠蔽効果は飽和し、経済的に不利となる。 As a plating bath for forming a zinc-cobalt-molybdenum alloy plating layer or a zinc-cobalt-tungsten alloy plating layer, an aqueous solution containing a known zinc sulfate, cobalt sulfate, ammonium molybdate or ammonium tungstate is used as an organic brightening agent. A material containing a nitrogen compound is used. When these plating baths are used to form a zinc-cobalt-molybdenum alloy plating layer or a zinc-cobalt-tungsten alloy plating layer on a steel plate, the plating films having different L * values depending on the content of the organic nitrogen compound in the plating bath However, in the present invention, a dark-plated steel sheet having a plating film having an L * value of 50 or less is used as a base for coating the black film shown below. If the L * value exceeds 50, it is necessary to increase the thickness of the black film in order to obtain the desired black color and heat dissipation. However, if the film becomes thicker, the conductivity becomes poor and welding becomes impossible. The plating amount is preferably 3 to 30 g / m 2 . If it is less than 3 g / m 2 , the glossy surface of the steel sheet as the plating base cannot be sufficiently concealed. If it exceeds 30 g / m 2 , the concealment effect is saturated, which is economically disadvantageous.
次いで上記のＬ＊値が５０以下である暗色の亜鉛−コバルト−モリブデン合金めっき層または亜鉛−コバルト−タングステン合金めっき層上に、ジルコニウム系の化成処理皮膜層を形成させる。化成処理皮膜層はめっき鋼板と黒色皮膜の密着性、特に加工密着性を向上させるために設ける。加工密着性の観点からはクロム系の化成処理皮膜層を設けることが好ましいが、作業環境や使用環境の観点からはジルコニウム系の化成処理などの非クロム系の化成処理による皮膜層を設けることが好ましい。ジルコニウム系の化成処理皮膜層を形成させる場合は、皮膜量としては蛍光Ｘ線法を用いて測定されるＺｒ量として０．１〜１０ｍｇ／ｍ２ であることが好ましく、０．５〜３ｍｇ／ｍ２であることがより好ましい。０．１ｍｇ／ｍ２未満および１０ｍｇ／ｍ２を超える場合は加工密着性が不良となり、好ましくない。 Next, a zirconium-based chemical conversion coating layer is formed on the dark zinc-cobalt-molybdenum alloy plating layer or zinc-cobalt-tungsten alloy plating layer having the L * value of 50 or less. The chemical conversion coating layer is provided in order to improve the adhesion between the plated steel sheet and the black coating, particularly the processing adhesion. From the viewpoint of work adhesion, it is preferable to provide a chromium-based chemical conversion coating layer, but from the viewpoint of the working environment and use environment, it is possible to provide a coating layer by a non-chromium chemical conversion treatment such as a zirconium-based chemical conversion treatment. preferable. In the case of forming a zirconium-based chemical conversion coating layer, the coating amount is preferably 0.1 to 10 mg / m 2 as the Zr amount measured using the fluorescent X-ray method, and 0.5 to 3 mg / m 2. more preferably m 2. When it is less than 0.1 mg / m 2 or more than 10 mg / m 2 , the processing adhesion is poor, which is not preferable.
このようにして得られる化成処理皮膜層を形成させた暗色めっき鋼板上に黒色皮膜層を形成させて、本発明の導電性黒色めっき鋼板とする。黒色皮膜層は、アクリル樹脂やウレタン樹脂などの水系樹脂溶液に黒色顔料を含有させたものを、上記の暗色めっき鋼板上に塗布し乾燥することにより形成させる。水系樹脂溶液としてはエマルジョンタイプやディスパージョンタイプのものがあるが、黒色顔料を均一に分散させる観点からディスパージョンタイプの水系樹脂を用いることが好ましい。樹脂濃度としては固形部分として１０〜５０％であることが好ましい。これらの水系樹脂溶液に含有させる黒色顔料としては、皮膜形成させる黒色皮膜に導電性を付与するものであり、天然黒鉛、人造黒鉛などの炭素質粉末が好ましく、カーボンブラック、アセチレンブラック、ケッチェンブラックなどの微細炭素質を用いることがより好ましい。これらの微細炭素質は固形分として２５〜３０％含有する水分散液として水系樹脂溶液に含有させるが、含有量としては樹脂濃度にもよるが、樹脂１００重量部に対して微細炭素質５〜３０重量部であることが好ましい。５重量部未満では皮膜の導電性が乏しく、溶接性が不良となる。３０重量部を超えると皮膜の可撓性が乏しくなり、曲率半径の小さな折り曲げ加工を施した場合に、皮膜にクラックが生じやすくなる。また、皮膜の耐食性や耐疵付性を向上させるためにシリカを含有させてもよいし、皮膜の滑り性を向上させるために４フッ化フルオロエチレンやポリエチレンワックスなどの潤滑剤を含有させてもよい。シリカや潤滑剤の配合量は、５〜３５重量％の範囲にあることが好ましい。 A black film layer is formed on the dark-plated steel sheet on which the chemical conversion film layer obtained in this way is formed, and the conductive black-plated steel sheet of the present invention is obtained. The black film layer is formed by applying a water-based resin solution such as acrylic resin or urethane resin containing a black pigment on the dark-plated steel sheet and drying. The aqueous resin solution includes emulsion type and dispersion type, but it is preferable to use a dispersion type aqueous resin from the viewpoint of uniformly dispersing the black pigment. The resin concentration is preferably 10 to 50% as a solid part. The black pigment to be contained in these aqueous resin solutions is to impart conductivity to the black film to form a film, and is preferably a carbonaceous powder such as natural graphite or artificial graphite. Carbon black, acetylene black, ketjen black It is more preferable to use a fine carbonaceous material such as These fine carbonaceous substances are contained in the aqueous resin solution as an aqueous dispersion containing 25 to 30% as a solid content, but the content depends on the resin concentration, but the fine carbonaceous substances 5 to 100 parts by weight of the resin. It is preferably 30 parts by weight. If it is less than 5 parts by weight, the conductivity of the film is poor and the weldability becomes poor. When the amount exceeds 30 parts by weight, the flexibility of the film becomes poor, and when the bending process with a small curvature radius is performed, the film is likely to crack. Further, silica may be added to improve the corrosion resistance and scratch resistance of the film, or a lubricant such as tetrafluorofluoroethylene or polyethylene wax may be added to improve the slipping property of the film. Good. The compounding amount of silica or lubricant is preferably in the range of 5 to 35% by weight.
このようにして水系樹脂水溶液に黒色顔料、または必要に応じてさらにシリカやフッ化物を含有させてなる溶液を、ロールコート法、スプレーコート法、浸漬コート法などいずれかの公知の塗布方法を用いて上記の暗色めっき鋼板表面に塗布し乾燥させ、黒色皮膜を形成させる。乾燥後の黒色樹脂皮膜の厚さは０．１〜１．２μｍであることが好ましい。０．１μｍ未満では十分な耐食性が得られない。一方、１．２μｍを超えるとコスト上のメリットが失われるだけでなく、十分な導電性及び熱放射性が得られない。 In this way, using a known coating method such as a roll coating method, a spray coating method, or a dip coating method, a solution in which an aqueous resin aqueous solution contains a black pigment or, if necessary, further silica or fluoride is used. Then, it is applied to the surface of the above dark-plated steel sheet and dried to form a black film. The thickness of the black resin film after drying is preferably 0.1 to 1.2 μm. If it is less than 0.1 μm, sufficient corrosion resistance cannot be obtained. On the other hand, if it exceeds 1.2 μm, not only the cost advantage is lost, but also sufficient conductivity and thermal radiation cannot be obtained.
上記のようにして得られ本発明の導電性黒色めっき鋼板は、熱放射率が０．５以上であることが好ましい。熱放射率を０．５以上とすることにより、発熱体を有する機器の外装材に適用した場合に優れた放熱性が得られる。 The conductive black-plated steel sheet of the present invention obtained as described above preferably has a thermal emissivity of 0.5 or more. By setting the thermal emissivity to 0.5 or more, excellent heat dissipation can be obtained when applied to an exterior material of a device having a heating element.
以下、実施例を示して本発明をさらに詳細に説明する。
[供試板の作成］
冷延鋼板（板厚０．３ｍｍ）をめっき基板として、アルカリ液中で電解脱脂し、次いで硫酸酸洗して水洗した後、下記に示すめっき浴を用い、めっき浴中の光沢剤（有機窒素化合物）の含有量を変化させ、表１に示すめっき量とＬ＊ 値を有する亜鉛−コバルト−モリブデン合金めっき層または亜鉛−コバルト−タングステン合金めっき層を形成させた。次いで下記に示すジルコニウム系の化成処理溶液を用いてめっき層上に表１に示す皮膜量の化成処理皮膜層を形成させ、めっき番号Ａ１〜Ａ４、Ｂ１〜Ｂ４で示す樹脂皮膜被覆下地めっき鋼板とした。
Hereinafter, the present invention will be described in more detail with reference to examples.
[Create test plate]
Cold-rolled steel sheet (thickness 0.3 mm) as a plating substrate, electrolytic degreasing in an alkaline solution, then sulfuric acid washing and water washing, then using a plating bath shown below, brightener (organic nitrogen) in the plating bath The content of the compound) was changed, and a zinc-cobalt-molybdenum alloy plating layer or a zinc-cobalt-tungsten alloy plating layer having the plating amount and L * value shown in Table 1 was formed. Next, using the zirconium-based chemical conversion treatment solution shown below, a chemical conversion coating layer having the coating amount shown in Table 1 is formed on the plating layer, and the resin coating-coated base plated steel sheet indicated by plating numbers A1 to A4 and B1 to B4; did.
<亜鉛−コバルト−モリブデン合金めっき浴>
浴組成 硫酸亜鉛 ２３０ｇ／Ｌ
硫酸コバルト ３０ｇ／Ｌ
モリブデン酸アンモニウム ０．０５ｇ／Ｌ
硫酸アンモニウム ３５ｇ／Ｌ
硫酸ナトリウム ２５ｇ／Ｌ
光沢剤（有機窒素化合物） ０〜３ｍＬ／Ｌ
浴温度 ４０℃
ｐＨ ２．７〜３．７
電流密度 ２０Ａ／ｄｍ２
<Zinc-cobalt-molybdenum alloy plating bath>
Bath composition Zinc sulfate 230g / L
Cobalt sulfate 30g / L
Ammonium molybdate 0.05 g / L
Ammonium sulfate 35g / L
Sodium sulfate 25g / L
Brightener (Organic nitrogen compound) 0-3mL / L
Bath temperature 40 ° C
pH 2.7-3.7
Current density 20A / dm 2
<亜鉛−コバルト−タングステン合金めっき浴>
浴組成 硫酸亜鉛 ２３０ｇ／Ｌ
硫酸コバルト ３０ｇ／Ｌ
タングステン酸アンモニウム １ｇ／Ｌ
硫酸アンモニウム ３５ｇ／Ｌ
硫酸ナトリウム ２５ｇ／Ｌ
光沢剤（有機窒素化合物） ０〜３ｍＬ／Ｌ
浴温度 ４０℃
ｐＨ ３．２〜４．３
電流密度 ２０Ａ／ｄｍ２
<Zinc-cobalt-tungsten alloy plating bath>
Bath composition Zinc sulfate 230g / L
Cobalt sulfate 30g / L
Ammonium tungstate 1g / L
Ammonium sulfate 35g / L
Sodium sulfate 25g / L
Brightener (Organic nitrogen compound) 0-3mL / L
Bath temperature 40 ° C
pH 3.2-4.3
Current density 20A / dm 2
<ジルコニウム系化成処理溶液>
浴組成 パーレン（日本パーカライジング(株)製） ７．５重量％
浴温度 ４０℃
<Zirconium-based chemical conversion solution>
Bath composition Parlene (Nippon Parkerizing Co., Ltd.) 7.5% by weight
Bath temperature 40 ° C
次いでディスパージョンタイプの水系ウレタン樹脂（固形分３０％）の単独溶液、またはこの水系ウレタン樹脂の単独溶液にカーボンブラック、シリカ、４フッ化フルオロエチレンのいずれか１種または２種以上を含有させてなる溶液を、表１に示した樹脂皮膜被覆下地めっき鋼板にロールコートし、次いで誘導加熱オーブンを用いて急速加熱乾燥し、表２に示す皮膜組成と皮膜厚さを有する黒色皮膜を形成させて試料番号１〜１２で示す供試板を作成した。 Next, a dispersion type aqueous urethane resin (solid content 30%) or a single solution of this aqueous urethane resin contains one or more of carbon black, silica, and tetrafluorofluoroethylene. The resulting solution is roll-coated on the resin film-coated base plated steel sheet shown in Table 1, and then rapidly heated and dried using an induction heating oven to form a black film having the film composition and film thickness shown in Table 2. Sample plates shown as sample numbers 1 to 12 were prepared.
[特性評価]
以上のようにして作成した試料番号１〜１２で示す供試板の特性を、以下のようにして評価した。
[Characteristic evaluation]
The characteristics of the test plates indicated by sample numbers 1 to 12 prepared as described above were evaluated as follows.
<Ｌ＊値>
亜鉛−コバルト−モリブデン合金めっき後または亜鉛−コバルト−タングステン合金めっき後のめっき鋼板の表面を、分光測色計（ＭＯＤＥＬ ＣＭ−３５００ｄ ミノルタ(株)製）を用いてＬ＊ 値を測定した。
<L * value>
The surface of the plated steel sheet after zinc-cobalt-molybdenum alloy plating or zinc-cobalt-tungsten alloy plating was measured for L * value using a spectrocolorimeter (MODEL CM-3500d manufactured by Minolta Co., Ltd.).
<加工密着性>
７２時間の塩水噴霧試験（ＳＳＴ）を施した供試板に張出高さ１０ｍｍでエリクセン張出加工を施し、突出部にスコッチテープを貼付けて強制剥離した後の黒色皮膜の剥離の有無を肉眼観察し、下記の基準加工密着性を評価した。
○：剥離は認められない
×：剥離が認められる。
<Processing adhesion>
The test plate subjected to the 72-hour salt spray test (SST) was subjected to Erichsen overhanging with an overhang height of 10 mm, and the presence or absence of peeling of the black film was visually observed after the scotch tape was applied to the protruding portion and forcedly peeled off. Observed and evaluated the following standard processing adhesion.
○: No peeling is observed ×: Peeling is recognized
<耐食性>
塩水噴霧試験（ＳＳＴ）を施した供試板の表面を肉眼観察し、面積率５％白錆が発生するまでの時間を求め、下記の基準で耐食性を評価した。耐食性は面積率５％白錆が発生するまでの時間が１２０時間以上（下記評価基準では◎と○に相当する）を合格とした。
◎：１４０時間以上
○：１２０時間以上でかつ１４０時間未満
×：１２０時間未満
<Corrosion resistance>
The surface of the test plate subjected to the salt spray test (SST) was visually observed, the time until white rust was generated with an area ratio of 5% was determined, and the corrosion resistance was evaluated according to the following criteria. Corrosion resistance was determined to be acceptable when 120% or more of the time until white rust was generated (corresponding to “◎” and “◯” in the following evaluation criteria) until white rust was generated.
◎: 140 hours or more ○: 120 hours or more and less than 140 hours ×: less than 120 hours
<導電性>
低抵抗率計（ロレスタＧＰ ＭＣＰ−Ｔ６００（三菱化学(株)製）を用い、ＪＩＳ K ７１９４に準拠して供試板および供試板に用いた冷延鋼板の抵抗値を測定し、冷延鋼板の抵抗値と供試板の抵抗値に差がない場合を導電性良好（○）、冷延鋼板の抵抗値よりも供試板の抵抗値が大きい場合を導電性不良（×）と評価した。
<Conductivity>
Using a low resistivity meter (Loresta GP MCP-T600 (manufactured by Mitsubishi Chemical Corporation)), the resistance value of the test plate and the cold-rolled steel plate used for the test plate was measured in accordance with JIS K 7194. When there is no difference between the resistance value of the steel plate and the resistance value of the test plate, the conductivity is good (○), and when the resistance value of the test plate is larger than the resistance value of the cold-rolled steel plate, it is evaluated as poor conductivity (×). did.
<熱放射性>
放射率計（ＡＥＲＤ放射率計（ＤＥＶＩＣＥＳ ＆ ＳＥＲＶＩＣＥＳ ＣＯＭＰＡＮＹ製））を用いて供試板の放射率を測定し、下記の基準で熱放射性を評価した。熱放射性は熱放射率が０．５以上（下記評価基準で◎と○に相当する）を合格とした。
◎：放射率≧０．６
○：放射率≧０．５でかつ＜０．６
×：放射率＜０．５
これらの特性評価結果を表３に示す。
<Thermal radiation>
The emissivity of the test plate was measured using an emissometer (AERD emissometer (manufactured by DEVICES & SERVICES COMPANY)), and thermal emissivity was evaluated according to the following criteria. Thermal emissivity was determined to be acceptable when the thermal emissivity was 0.5 or more (corresponding to ◎ and ○ in the following evaluation criteria).
A: Emissivity ≧ 0.6
○: Emissivity ≧ 0.5 and <0.6
×: Emissivity <0.5
These characteristic evaluation results are shown in Table 3.
本発明の導電性黒色めっき鋼板は、亜鉛めっき鋼板のめっき層をＬ＊ 値が５０以下となるように暗色化して黒色めっき鋼板とし、この黒色めっき鋼板に１．２μｍ以下の薄膜の黒色皮膜を被覆したものであり、黒色皮膜が薄いために原板の冷延鋼板と同等の優れた導電性を示し、また薄膜でも十分な黒色を呈するために放射率が０．５以上と高く、優れた熱放射性を示す。そのため、溶接性が要求される用途や放熱性を要求される用途に好適に適用することができる。 The conductive black-plated steel sheet of the present invention darkens the plating layer of the galvanized steel sheet so that the L * value is 50 or less to form a black-plated steel sheet, and a thin film of 1.2 μm or less is formed on the black-plated steel sheet. Because it is coated, it has excellent conductivity equivalent to that of the cold-rolled steel sheet as the original because the black film is thin. Shows radioactivity. Therefore, it can be suitably applied to applications requiring weldability and applications requiring heat dissipation.
Claims (7)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2005113010A JP2006291279A (en) | 2005-04-11 | 2005-04-11 | Electrically conductive black plated steel sheet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2005113010A JP2006291279A (en) | 2005-04-11 | 2005-04-11 | Electrically conductive black plated steel sheet |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2006291279A true JP2006291279A (en) | 2006-10-26 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2005113010A Withdrawn JP2006291279A (en) | 2005-04-11 | 2005-04-11 | Electrically conductive black plated steel sheet |
Country Status (1)
| Country | Link |
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| JP (1) | JP2006291279A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009220511A (en) * | 2008-03-18 | 2009-10-01 | Sumitomo Metal Ind Ltd | Surface-treated steel sheet and coated steel sheet excellent in corrosion resistance, heat emitting property and electrical conductivity |
| WO2011135787A1 (en) * | 2010-04-26 | 2011-11-03 | 東洋鋼鈑株式会社 | Plated steel sheet for producing pipe having corrosion resistance against fuel vapor, and pipe and oil supply pipe using the plated steel sheet |
-
2005
- 2005-04-11 JP JP2005113010A patent/JP2006291279A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009220511A (en) * | 2008-03-18 | 2009-10-01 | Sumitomo Metal Ind Ltd | Surface-treated steel sheet and coated steel sheet excellent in corrosion resistance, heat emitting property and electrical conductivity |
| WO2011135787A1 (en) * | 2010-04-26 | 2011-11-03 | 東洋鋼鈑株式会社 | Plated steel sheet for producing pipe having corrosion resistance against fuel vapor, and pipe and oil supply pipe using the plated steel sheet |
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Legal Events
| Date | Code | Title | Description |
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| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20080701 |