JPH0318180Y2 - - Google Patents
Info
- Publication number
- JPH0318180Y2 JPH0318180Y2 JP1984014483U JP1448384U JPH0318180Y2 JP H0318180 Y2 JPH0318180 Y2 JP H0318180Y2 JP 1984014483 U JP1984014483 U JP 1984014483U JP 1448384 U JP1448384 U JP 1448384U JP H0318180 Y2 JPH0318180 Y2 JP H0318180Y2
- Authority
- JP
- Japan
- Prior art keywords
- weight
- parts
- heat resistance
- muffler
- layer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 229910000831 Steel Inorganic materials 0.000 claims description 39
- 239000010959 steel Substances 0.000 claims description 39
- 229920005989 resin Polymers 0.000 claims description 25
- 239000011347 resin Substances 0.000 claims description 25
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 14
- 239000004642 Polyimide Substances 0.000 claims description 11
- 150000001408 amides Chemical class 0.000 claims description 11
- 229920001721 polyimide Polymers 0.000 claims description 11
- NVKTUNLPFJHLCG-UHFFFAOYSA-N strontium chromate Chemical compound [Sr+2].[O-][Cr]([O-])(=O)=O NVKTUNLPFJHLCG-UHFFFAOYSA-N 0.000 claims description 9
- 229920001296 polysiloxane Polymers 0.000 claims description 8
- 239000000126 substance Substances 0.000 claims description 6
- 238000012986 modification Methods 0.000 claims description 4
- 230000004048 modification Effects 0.000 claims description 4
- 229920003055 poly(ester-imide) Polymers 0.000 claims description 4
- FJMNNXLGOUYVHO-UHFFFAOYSA-N aluminum zinc Chemical compound [Al].[Zn] FJMNNXLGOUYVHO-UHFFFAOYSA-N 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 claims description 2
- 239000003973 paint Substances 0.000 description 26
- 239000010410 layer Substances 0.000 description 25
- 238000005260 corrosion Methods 0.000 description 20
- 230000007797 corrosion Effects 0.000 description 20
- 239000011247 coating layer Substances 0.000 description 15
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 14
- 238000000576 coating method Methods 0.000 description 11
- 238000007747 plating Methods 0.000 description 11
- 239000011248 coating agent Substances 0.000 description 9
- 238000012360 testing method Methods 0.000 description 8
- 229910018137 Al-Zn Inorganic materials 0.000 description 6
- 229910018573 Al—Zn Inorganic materials 0.000 description 6
- 239000006229 carbon black Substances 0.000 description 6
- 239000000049 pigment Substances 0.000 description 6
- 230000007423 decrease Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- 229910045601 alloy Inorganic materials 0.000 description 4
- 239000000956 alloy Substances 0.000 description 4
- 238000004040 coloring Methods 0.000 description 4
- 238000007739 conversion coating Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000000843 powder Substances 0.000 description 4
- 229910001335 Galvanized steel Inorganic materials 0.000 description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 3
- 239000008397 galvanized steel Substances 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- 238000010422 painting Methods 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- 239000010703 silicon Substances 0.000 description 3
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 2
- 229910001297 Zn alloy Inorganic materials 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 239000003518 caustics Substances 0.000 description 2
- ZCDOYSPFYFSLEW-UHFFFAOYSA-N chromate(2-) Chemical compound [O-][Cr]([O-])(=O)=O ZCDOYSPFYFSLEW-UHFFFAOYSA-N 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
- 239000011651 chromium Substances 0.000 description 2
- DJLCOAPFZCDZQW-UHFFFAOYSA-N chromium phosphoric acid Chemical compound [Cr].OP(O)(O)=O DJLCOAPFZCDZQW-UHFFFAOYSA-N 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 229920000728 polyester Polymers 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 229920000298 Cellophane Polymers 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- BCFSVSISUGYRMF-UHFFFAOYSA-N calcium;dioxido(dioxo)chromium;dihydrate Chemical compound O.O.[Ca+2].[O-][Cr]([O-])(=O)=O BCFSVSISUGYRMF-UHFFFAOYSA-N 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000005238 degreasing Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009713 electroplating Methods 0.000 description 1
- 238000005246 galvanizing Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000011812 mixed powder Substances 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 238000007781 pre-processing Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000003449 preventive effect Effects 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
Description
本考案は自動車等のマフラーの製造に適した耐
熱性、耐食性および加工性の優れたマフラー用塗
装鋼板に関する。
従来自動車等の排気ガス系統内のマフラーには
耐熱性、耐食性に優れたアルミニウムめつき鋼板
（以下単にAlめつき鋼板という）やアルミニウム
−亜鉛合金めつき鋼板（以下単にAl−Zn合金め
つき鋼板という）を単に成型加工したものが用い
られていたが、マフラーは一般にエンジンの作動
中水分や腐食性物質を含む高温の排ガスにさらさ
れ、かつエンジンの停止中は冷却されて水分や腐
食性物質が凝縮滞留するという腐食サイクルを受
けるとともに、著しい温寒サイクルも受けるもの
である。このため上記のようなマフラーでは短期
間に腐食され、マフラーとしての機能を失つてし
まい、また更新しても短期間で廃却に追込まれて
しまうものであつた。
そこでこのような短期間の廃却、更新のくり返
しを改善すべく、マフラーの種類によつては素材
として片面に有機塗膜を形成した塗装Alめつき
鋼板や塗装Al−Zn合金めつき鋼板を用いて、そ
の有機塗膜がマフラーの内側になるように成型加
工したものが用いられている。しかし素材の片面
塗装めつき鋼板の有機塗膜は一般的な組成の塗料
を塗装したものであるため、耐熱性が劣り、マフ
ラーにした場合排ガスにより部分的に剥離してし
まい、その剥離部分より腐食されてしまうという
欠点があつた。
一方最近マフラーの傾向として、マフラーの外
側を着色して意匠性を高めることが行われてお
り、とくに黒色に着色することが行われている。
しかしこの着色は従来成型加工後一般的な組成の
塗料を塗装して目的の色の有機皮膜を形成すると
いう方法により行われていたため、耐食上前記の
ような欠点があり、かつ塗装の際脱脂、前処理、
塗装等の工程で行わなければならないため、製造
が繁雑になるという欠点があつた。
本考案はかかる欠点に鑑み、成型加工するだけ
で直接マフラーを製造でき、しかもマフラーとし
て使用した場合従来より耐熱性、耐食性に優れた
マフラー用塗装鋼板を提供するもので、塗装原板
としては従来の如く耐熱性、耐食性に優れたAl
めつき鋼板またはAl−Zn合金めつき鋼板を用い、
この鋼板上に耐熱性、耐食性に優れた塗膜層を形
成することにより従来の欠点を解消したものであ
る。すなわち本考案は表面に化成処理皮膜層が形
成されたアルミニウムめつき鋼板またはアルミニ
ウム−亜鉛合金めつき鋼板上にポリイミドアミド
系樹脂100重量部に対してストロンチウムクロメ
ートを10〜50重量部含有する下塗り塗膜層が形成
され、さらにこの下塗り塗膜層の上にシリコン変
性量35〜50％のシリコンポリエステル系またはポ
リイミドアミド系樹脂100重量部に対してアルミ
ニウム粉末を５〜20重量部含有する上塗り塗膜層
が形成されていることを特徴とするマフラー用塗
装鋼板を提供するものである。
以下本考案を図面に基いて詳細に説明する。
添付図面の第１図、第２図は本考案に係る塗装
鋼板の拡大断面図で、第１図は片面塗装鋼板の場
合を、第２図は両面塗装鋼板の場合を示してい
る。これらの図において１は塗装原板であるAl
めつき鋼板またはAl−Zn合金めつき鋼板で、２
はこれらの鋼板表面に形成された化成処理皮膜層
である。また３はこの皮膜層２の上に形成された
下塗り塗膜層であり、さらに４はこの下塗り塗膜
層３の上に形成された上塗り塗膜層である。
以上のように構成された塗装鋼板においてAl
めつき鋼板またはAl−Zn合金めつき鋼板１には
めつき法により種々のものがあるが溶融めつき
法、電気めつき法、蒸着めつき法、スパツタリン
グめつき法、その他いずれのめつき法によつたも
のでもよい。まためつ層の組成もAlまたはAl−
Zn合金を基質としていれば耐熱性、耐食性また
は加工性改善などのため添加元素を加えられてい
てもよい。しかしこれらのめつき鋼板は本考案の
場合溶融めつき法で製造した溶融めつき鋼板が好
ましい。溶融Alめつき鋼板には工業的純Alをめ
つきしたものと、これにSiを添加したものをめつ
きしたものがあるが後者が耐熱性、加工性に優れ
ているので好ましい。また溶融Al−Zn合金めつ
き鋼板にもSiを添加しないものとしたものがある
が、上記同様の理由によりSiを添加したものが好
ましい。
化成処理皮膜層２は塗装密着性、耐食性を向上
させるものであればよいが、一般的にはリン酸−
クロム系のものが好ましい。皮膜層の厚さや皮膜
層中のクロム量などはとくに限定を必要としな
い。
下塗り塗膜層３は防錆顔料を含有させてマフラ
ーに加工する際に塗膜に傷が付いたり、鋼板端面
が露出した場合に耐食性を発揮させるもので、防
錆顔料としてはストロンチウムクロメート、ジン
ククロメート、カルシウムクロメートなどクロメ
ート系のものが耐熱上好ましいが、本考案の場合
とくにストロンチウムクロメートが好ましい。ま
た樹脂も比較的耐熱性に優れたものであればよい
が、本考案の場合とくにポリイミドアミド系が好
ましい。
塗膜層中へのストロンチウムクロメートを含有
させる割合は樹脂100重量部に対して10〜50重量
部となるようにする。これは10重量部未満である
と防錆効果が不十分で、耐食上好ましくなく、50
重量部を超えると塗膜がポーラスになつて防錆顔
料が溶出するとともに、塗膜の密着性、耐食性が
低下し、コストも高くなる。塗膜層の厚さとして
は３〜8μで充分である。
上塗り塗膜層４は通常の着色顔料や添加剤を含
有させただけの一般の塗膜であると耐熱性がない
ので、アルミニウム粉末を含有させて耐熱性を向
上させる。このアルミニウム粉末は金属アルミニ
ウム粉末、または酸化アルミニウム粉末あるいは
これらの混合粉末でもよい。これらの粉末は塗膜
層の耐熱性を向上させるほか、めつき層に含まれ
るアルミニウムと同種であるので、腐食の際めつ
き層を保護することから電位的にも好ましい。樹
脂も下塗り塗膜層３の場合と同様比較的耐熱性に
優れたものであればよく、本考案の場合シリコン
ポリエステル系およびポリイミドアミド系が好ま
しい。前者のシリコンポリエステル系の場合シリ
コン変性量により耐熱温度が変化するが、35％未
満であると樹脂の分解速度が大きく、マフラーに
使用した場合目的の耐熱性が得られず、また50％
を超えると加工性、耐食性が低下し、かつコスト
も高くなるので、シリコン変性量が35〜50％のも
のが好ましい。
この上塗り塗膜層の場合塗膜中に含有させるア
ルミニウム粉末の割合は樹脂10重量部に対して５
〜20重量部となるようにする。５重量部未満であ
ると腐食イオンの透過性が低下して、防錆顔料を
含有する下塗り塗膜層３へ容易に透過せず、上塗
り塗膜層４内に長くとどまり、耐食性が悪くな
る。また20重量部を超えると塗料調台の際分散性
に欠け、塗膜の密着性が低下する。塗膜層の厚さ
は加工上８〜20μが適当である。
またマフラーの意匠性を高めるのに着色する場
合にはこの上塗り塗膜層４中にはアルミニウム粉
末とともに着色顔料を含有させる。例えば外側が
黒色のマフラーを本考案の塗装鋼板より製造する
にはカーボンブラツクで着色したものを用いる。
このカーボンブラツクで着色する際には樹脂100
重量部に対してカーボンブラツクを１〜２重量部
含有させるのが好ましい。これは１重量部未満で
あると着色不足で、充分黒色化できず、また２重
量部を超えると耐熱性、加工性が低下し、しかも
コスト上昇につながる
以上のように構成された本考案の塗装鋼板は上
下の塗膜層に使用する樹脂の組合せにより耐熱性
は異なるが、その組合せはマフラーとして使用時
の温度により決定する。
次に実施例により本考案を説明する。
めつき層にSiを７重量％含有する溶融Alめつ
き鋼板（板厚0.6mm、幅200mm、長さ300mm、めつ
き付着量（両面）80ｇ／m2）およびめつき層組成
がAl54.5％、Zn42％、Si3％、残不可避的不純物
からなる溶融Al−Zn合金めつき鋼板（板厚0.6
mm、めつき付着量（両面）200ｇ／m2、大きさは
前記同様）をリン酸−クロム系前処理液（日本ペ
イント〓製、商品名アロジン＃407−47）で処理
してクロム付着量25mg／m2（片面）の化成処理皮
膜を形成し、その上にストロンチウムクロメート
を含有するポリイミドアミド系樹脂の塗料をロー
ルコート法により塗装してコンベアオーブンにて
200±10℃（到達板温）で40秒間焼付け、乾燥塗
膜の厚さが4μで、ストロンチウムクロメートの
含有量が樹脂100重量部に対して５〜55重量部で
ある下塗り塗膜層を形成した。その後この下塗り
塗膜層の上にアルミニウム粉末またはこの粉末と
カーボンブラツクとを含有するシリコンポリエス
テル系（シリコン変性量30〜50％）またはポリイ
ミドアミド系樹脂の塗料をロールコート法で塗装
するとともに比較のためにアルミニウム粉末やカ
ーボンブラツクを含有しないポリイミドアミド系
樹脂塗料をも同法で塗装した。そして塗装後再度
コンベアオーブンにて230±10℃（到達板温）で
60秒間焼付け、乾燥塗膜厚が12μで、アルミニウ
ム粉末を樹脂100重量部に対して３〜25重量部ま
たはこの粉末とともにカーボンブラツクを樹脂
100重量部に対して0.5〜2.5重量部含有する上塗
り塗膜層およびクリヤ上塗り塗膜層を形成して試
験用塗装鋼板とした。次にこの塗装鋼板に対して
下記要領で耐熱性、耐食性〔塩水噴霧試験（S.S.
T）と湿潤試験（B.B）〕および加工性の各試験
を行い、評価した。
(1) 耐熱性
熱風循環乾燥機にて所定温度で長時間加熱後恒
温恒室（４20℃、60％RH）に24時間放置し、そ
の後JIS−G3312に準拠してゴバン目試験を行つ
た。
◎ 塗膜剥離の全くないもの
○ +塗膜がごくわずかに剥離したもの
○ 塗膜がわずかに剥離したもの
△ 塗膜がかなり剥離したもの
× 塗膜が著しく剥離したもの
(2) 耐食性
(2)−１塩水噴霧試験（S.S.T）
JIS−Z2371に準拠して500時間行つた。
◎ 塗膜フクレ、錆発生の全くないもの
○ +塗膜フクレ、錆発生がごくわずかにあるも
の
○ 塗膜フクレ、錆発生がわずかにあるもの
△ 塗膜フクレ、錆発生がかなりあるもの
× 塗膜フクレ、錆発生が著しいもの
(2)−２湿潤試験（B.B）
JIS−K2246に準拠して500時間行つた。
◎ 塗膜フクレ、錆発生の全くないもの
○ +塗膜フクレ、錆発生がごくわずかにあるも
の
○ 塗膜フクレ、錆発生がわずかにあるもの
△ 塗膜フクレ、錆発生がかなりあるもの
× 塗膜フクレ、錆発生が著しいもの
(3) 加工法
JIS−G3312に準拠し、180゜4T曲げ後、コーナ
ー部にセロハンテープを張りつけ強制剥離し塗膜
の剥離状態を次の基準により判定した。
◎ 塗膜剥離のないもの
○ 極くわずかに剥離したもの
△ かなり剥離したもの
× 全面剥離したもの
試験結果をめつき鋼板種類および塗膜層組成と
ともに第１表に示す。
The present invention relates to a painted steel plate for mufflers that has excellent heat resistance, corrosion resistance, and workability and is suitable for manufacturing mufflers for automobiles and the like. Traditionally, mufflers in the exhaust gas systems of automobiles, etc. are made of aluminum-plated steel sheets (hereinafter simply referred to as Al-plated steel sheets) and aluminum-zinc alloy-plated steel sheets (hereinafter simply referred to as Al-Zn alloy-plated steel sheets), which have excellent heat resistance and corrosion resistance. However, mufflers are generally exposed to high-temperature exhaust gas containing moisture and corrosive substances during engine operation, and are cooled and exposed to moisture and corrosive substances when the engine is stopped. In addition to being subjected to a corrosion cycle in which water condenses and stagnates, it is also subjected to significant heating and cooling cycles. For this reason, the muffler as described above corrodes in a short period of time, loses its function as a muffler, and even if it is updated, it is forced to be scrapped in a short period of time. Therefore, in order to improve this kind of short-term disposal and renewal, depending on the type of muffler, painted Al-plated steel sheets with an organic coating on one side or painted Al-Zn alloy-plated steel sheets are used as materials. The muffler is molded so that the organic coating film is on the inside of the muffler. However, since the organic coating on the single-sided coated steel sheet is coated with a paint of a general composition, it has poor heat resistance, and when used as a muffler, it will peel off partially due to exhaust gas, and the peeled part will be It had the disadvantage of being corroded. On the other hand, a recent trend in mufflers has been to color the outside of the muffler to enhance its design, and in particular, to color it black.
However, this coloring has traditionally been done by applying a paint with a general composition after molding to form an organic film of the desired color, which has the disadvantages mentioned above in terms of corrosion resistance, and requires degreasing during painting. ,Preprocessing,
This had the disadvantage that manufacturing was complicated because it had to be done in a process such as painting. In view of these drawbacks, the present invention provides a painted steel sheet for mufflers that can be directly manufactured into mufflers simply by molding and has superior heat resistance and corrosion resistance when used as a muffler. Al with excellent heat resistance and corrosion resistance
Using plated steel plate or Al-Zn alloy plated steel plate,
By forming a coating layer with excellent heat resistance and corrosion resistance on this steel plate, the conventional drawbacks have been overcome. That is, the present invention applies an undercoat containing 10 to 50 parts by weight of strontium chromate to 100 parts by weight of polyimide amide resin on an aluminum-plated steel sheet or an aluminum-zinc alloy-plated steel sheet with a chemical conversion coating layer formed on the surface. A film layer is formed, and a top coat film containing 5 to 20 parts by weight of aluminum powder per 100 parts by weight of silicone polyester or polyimide amide resin with a silicone modification amount of 35 to 50% is formed on this undercoat film layer. The present invention provides a painted steel plate for a muffler characterized by having a layer formed thereon. The present invention will be explained in detail below with reference to the drawings. FIGS. 1 and 2 of the accompanying drawings are enlarged sectional views of a coated steel plate according to the present invention, with FIG. 1 showing a steel plate coated on one side, and FIG. 2 showing a steel plate coated on both sides. In these figures, 1 is the painted original plate Al
Plated steel plate or Al-Zn alloy plated steel plate, 2
is the chemical conversion coating layer formed on the surface of these steel sheets. Further, 3 is an undercoat film layer formed on this film layer 2, and further 4 is an overcoat film layer formed on this undercoat film layer 3. In the painted steel plate constructed as above, Al
There are various plating methods for galvanized steel sheets or Al-Zn alloy coated steel sheets 1, including hot-dip plating, electroplating, vapor deposition plating, sputtering plating, and any other plating method. It may be something that has been washed away. Also, the composition of the eye layer is Al or Al-
If a Zn alloy is used as a substrate, additive elements may be added to improve heat resistance, corrosion resistance, workability, etc. However, in the case of the present invention, these galvanized steel plates are preferably hot-dip galvanized steel plates manufactured by a hot-dip galvanizing method. Hot-dip Al-plated steel sheets include those plated with industrially pure Al and those plated with Si added thereto, and the latter is preferred because it has excellent heat resistance and workability. Although some steel sheets coated with molten Al--Zn alloy do not contain Si, it is preferable to add Si for the same reason as above. The chemical conversion coating layer 2 may be of any material as long as it improves paint adhesion and corrosion resistance, but generally phosphoric acid-
Chromium-based materials are preferred. There are no particular limitations on the thickness of the coating layer, the amount of chromium in the coating layer, etc. The undercoat film layer 3 contains anti-rust pigments to provide corrosion resistance when the paint film is scratched or the edge of the steel plate is exposed during processing into a muffler.The anti-rust pigments include strontium chromate and zinc. Chromate-based materials such as chromate and calcium chromate are preferred from the viewpoint of heat resistance, and strontium chromate is particularly preferred in the present invention. Further, the resin may be any resin as long as it has relatively excellent heat resistance, but in the case of the present invention, polyimide amide resins are particularly preferred. The proportion of strontium chromate contained in the coating layer is 10 to 50 parts by weight per 100 parts by weight of the resin. If it is less than 10 parts by weight, the rust prevention effect will be insufficient and it is not preferable in terms of corrosion resistance.
If the amount exceeds 1 part by weight, the coating film becomes porous and the rust-preventing pigment is eluted, and the adhesion and corrosion resistance of the coating film decreases, leading to an increase in cost. A thickness of 3 to 8 microns is sufficient for the coating layer. Since the top coat layer 4 does not have heat resistance if it is a general coat containing only ordinary coloring pigments and additives, the heat resistance is improved by containing aluminum powder. The aluminum powder may be a metallic aluminum powder, an aluminum oxide powder, or a mixed powder thereof. These powders improve the heat resistance of the coating layer, and since they are the same type of aluminum contained in the plating layer, they protect the plating layer from corrosion, which is preferable in terms of electric potential. As in the case of the undercoat film layer 3, the resin may be any resin as long as it has relatively excellent heat resistance, and in the case of the present invention, silicone polyester and polyimide amide resins are preferred. In the case of the former silicone polyester type, the heat resistance temperature changes depending on the amount of silicon modification, but if it is less than 35%, the decomposition rate of the resin is high, and when used in a muffler, the desired heat resistance cannot be obtained, and if it is less than 35%.
If the amount exceeds 35% to 50%, it is preferable that the amount of silicon modification is 35 to 50%, since processability and corrosion resistance will decrease and costs will also increase. In the case of this top coat layer, the proportion of aluminum powder contained in the coating is 5 parts by weight per 10 parts by weight of resin.
~20 parts by weight. If the amount is less than 5 parts by weight, the permeability of corrosive ions will decrease, and they will not easily permeate into the undercoat layer 3 containing the rust preventive pigment, but will remain in the topcoat layer 4 for a long time, resulting in poor corrosion resistance. Moreover, if it exceeds 20 parts by weight, dispersibility will be lacking during paint preparation, and the adhesion of the paint film will decrease. The appropriate thickness of the coating layer is 8 to 20 microns for processing reasons. When the muffler is colored to enhance its design, the top coat layer 4 contains a coloring pigment together with the aluminum powder. For example, to manufacture a muffler with a black outside from the painted steel plate of the present invention, a muffler colored with carbon black is used.
When coloring with this carbon black, use resin 100.
It is preferable to contain 1 to 2 parts by weight of carbon black. If it is less than 1 part by weight, there will be insufficient coloration and blackening will not be achieved sufficiently, and if it exceeds 2 parts by weight, heat resistance and processability will decrease, and furthermore, this will lead to an increase in cost. The heat resistance of coated steel sheets varies depending on the combination of resins used in the upper and lower coating layers, and the combination is determined by the temperature at which the sheet is used as a muffler. Next, the present invention will be explained with reference to examples. Hot-dip Al-plated steel plate containing 7% by weight of Si in the plating layer (thickness 0.6 mm, width 200 mm, length 300 mm, plating amount (both sides) 80 g/m 2 ) and the plating layer composition being Al54.5 %, Zn42%, Si3%, remaining unavoidable impurities.
mm, plating adhesion amount (both sides) 200 g/m 2 , size is the same as above) was treated with phosphoric acid-chromium pretreatment liquid (manufactured by Nippon Paint, trade name Alodine #407-47) to reduce the amount of chromium adhesion. A chemical conversion film of 25 mg/m 2 (one side) is formed, and then a polyimide amide resin paint containing strontium chromate is applied using a roll coating method, and the film is heated in a conveyor oven.
Baked for 40 seconds at 200±10℃ (achieved board temperature) to form an undercoat layer with a dry coating thickness of 4μ and a strontium chromate content of 5 to 55 parts by weight per 100 parts by weight of resin. did. Then, on top of this undercoat film layer, aluminum powder or a silicone polyester (silicon modified amount: 30 to 50%) or polyimide amide resin paint containing aluminum powder and carbon black was applied using a roll coating method. Therefore, a polyimide amide resin paint that does not contain aluminum powder or carbon black was also applied using the same method. After painting, it is heated again in a conveyor oven at 230±10℃ (achieved board temperature).
Bake for 60 seconds, dry coating thickness is 12μ, add 3 to 25 parts by weight of aluminum powder to 100 parts by weight of resin, or add carbon black to resin together with this powder.
A coated steel sheet for testing was prepared by forming a topcoat film layer and a clear topcoat film layer containing 0.5 to 2.5 parts by weight per 100 parts by weight. Next, this coated steel plate was tested for heat resistance and corrosion resistance [salt spray test (SS)] in the following manner.
T), wetness test (BB)] and processability tests were conducted and evaluated. (1) Heat resistance After heating at a predetermined temperature in a hot air circulation dryer for a long time, it was left in a constant temperature room (420°C, 60% RH) for 24 hours, and then a cross-cut test was conducted in accordance with JIS-G3312. ◎ No paint film peeling at all ○ + Paint film peeling very slightly ○ Paint film peeling slightly △ Paint film peeling considerably × Paint film peeling significantly (2) Corrosion resistance (2) )-1 Salt spray test (SST) It was conducted for 500 hours in accordance with JIS-Z2371. ◎ No paint film blisters or rust at all ○ + Paint film blisters or very slight rust occurrence ○ Paint film blisters or slight rust occurrence △ Paint film blisters or rust occurrences considerably × Paint Cases with significant film blistering and rust (2)-2 Moisture test (BB) Tested for 500 hours in accordance with JIS-K2246. ◎ No paint film blisters or rust at all ○ + Paint film blisters or very slight rust occurrence ○ Paint film blisters or slight rust occurrence △ Paint film blisters or rust occurrences considerably × Paint Items with significant film blistering and rust (3) Processing method In accordance with JIS-G3312, after bending 180°4T, cellophane tape was applied to the corner and forcibly peeled off, and the peeling state of the paint film was judged according to the following criteria. ◎ No coating peeling ○ Very slight peeling △ Significant peeling × Fully peeling The test results are shown in Table 1 along with the type of plated steel sheet and coating layer composition.
【表】
第１表より下塗り塗膜層の樹脂がポリイミドア
ミド系で、樹脂100重量部に対してストロンチウ
ムクロメートを10〜50重量部含有し、かつ上塗り
塗膜層の樹脂がシリコンポリエステル系またはポ
リイミドアミド系で、樹脂100重量部に対してア
ルミニウム粉末を５〜20重量部含有したもの（No.
１〜７）は耐熱性、耐食性および加工性において
総合的に優れており、ストロンチウムクロメート
および／またはアルミニウム粉末が上記範囲より
外れたものは耐熱性、耐食性または加工性のいず
れかにおいて劣つている。
以上の本考案の塗装鋼板は耐熱性、耐食性およ
び加工性に優れているので、マフラーに使用した
場合マフラーの耐用年数は従来のものに比べ著し
く長くなる。また成型加工するだけで直接マフラ
ーを製造できるので、製造工程が大幅に合理化で
きる。[Table] Table 1 shows that the resin of the undercoat layer is polyimide amide, contains 10 to 50 parts by weight of strontium chromate per 100 parts of resin, and the resin of the topcoat layer is silicone polyester or polyimide. An amide type product containing 5 to 20 parts by weight of aluminum powder per 100 parts by weight of resin (No.
Nos. 1 to 7) are comprehensively excellent in heat resistance, corrosion resistance, and processability, while those containing strontium chromate and/or aluminum powder outside the above range are inferior in either heat resistance, corrosion resistance, or processability. The painted steel sheet of the present invention has excellent heat resistance, corrosion resistance, and workability, so when used in a muffler, the service life of the muffler is significantly longer than that of conventional ones. Additionally, since mufflers can be manufactured directly by simply molding, the manufacturing process can be greatly streamlined.
添付図面は本考案に係るマフラー用塗装鋼板の
拡大断面を示すもので、第１図は片面塗装のもの
の場合、第２図は両面塗装のものの場合を示して
いる。
１……Alめつき鋼板またはAl−Zn合金めつき
鋼板、２……化成処理皮膜層、３……下塗り塗膜
層、４……上塗り塗膜層。
The attached drawings show enlarged cross-sections of painted steel plates for mufflers according to the present invention, with FIG. 1 showing one coated on one side, and FIG. 2 showing one coated on both sides. 1... Al-plated steel plate or Al-Zn alloy plated steel plate, 2... Chemical conversion coating layer, 3... Undercoat coating layer, 4... Topcoat coating layer.
Claims (1)
ムめつき鋼板またはアルミニウム−亜鉛合金めつ
き鋼板上にポリイミドアミド系樹脂100重量部に
対してストロンチウムクロメートを10〜50重量部
含有する下塗り塗膜層が形成され、さらにこの下
塗り塗膜層の上にシリコン変性量35〜50％のシリ
コンポリエステル系またはポリイミドアミド系樹
脂100重量部に対してアルミニウム粉末を５〜20
重量部含有する上塗り塗膜層が形成されているこ
とを特徴とするマフラー用塗装鋼板。 An undercoat film layer containing 10 to 50 parts by weight of strontium chromate per 100 parts by weight of polyimide amide resin is formed on an aluminum-plated steel sheet or an aluminum-zinc alloy-plated steel sheet with a chemical conversion film layer formed on the surface. 5 to 20 parts by weight of aluminum powder per 100 parts by weight of silicone polyester or polyimide amide resin with a silicone modification content of 35 to 50% is added on top of this undercoat layer.
A coated steel sheet for a muffler, characterized in that a topcoat film layer containing part by weight is formed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1448384U JPS60127926U (en) | 1984-02-03 | 1984-02-03 | Painted steel plate for muffler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1448384U JPS60127926U (en) | 1984-02-03 | 1984-02-03 | Painted steel plate for muffler |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60127926U JPS60127926U (en) | 1985-08-28 |
| JPH0318180Y2 true JPH0318180Y2 (en) | 1991-04-17 |
Family
ID=30499448
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1448384U Granted JPS60127926U (en) | 1984-02-03 | 1984-02-03 | Painted steel plate for muffler |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60127926U (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54112979A (en) * | 1978-02-24 | 1979-09-04 | Toyo Kohan Co Ltd | Composite covered steel plate |
| JPS5563260A (en) * | 1978-11-06 | 1980-05-13 | Toyo Kohan Co Ltd | High anticorrosive compound coated steel plate |
| JPS56127448A (en) * | 1980-03-12 | 1981-10-06 | Toyo Kohan Co Ltd | Metallic body coated with composite resin |
| JPS5887044A (en) * | 1981-11-18 | 1983-05-24 | 日新製鋼株式会社 | Painted aluminum plated steel plate |
-
1984
- 1984-02-03 JP JP1448384U patent/JPS60127926U/en active Granted
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54112979A (en) * | 1978-02-24 | 1979-09-04 | Toyo Kohan Co Ltd | Composite covered steel plate |
| JPS5563260A (en) * | 1978-11-06 | 1980-05-13 | Toyo Kohan Co Ltd | High anticorrosive compound coated steel plate |
| JPS56127448A (en) * | 1980-03-12 | 1981-10-06 | Toyo Kohan Co Ltd | Metallic body coated with composite resin |
| JPS5887044A (en) * | 1981-11-18 | 1983-05-24 | 日新製鋼株式会社 | Painted aluminum plated steel plate |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60127926U (en) | 1985-08-28 |
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