JPH04198487A - Method for coating stainless steel - Google Patents
Method for coating stainless steelInfo
- Publication number
- JPH04198487A JPH04198487A JP32533690A JP32533690A JPH04198487A JP H04198487 A JPH04198487 A JP H04198487A JP 32533690 A JP32533690 A JP 32533690A JP 32533690 A JP32533690 A JP 32533690A JP H04198487 A JPH04198487 A JP H04198487A
- Authority
- JP
- Japan
- Prior art keywords
- stainless steel
- film
- coating
- treatment
- steel material
- 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
Links
- 229910001220 stainless steel Inorganic materials 0.000 title claims abstract description 36
- 239000010935 stainless steel Substances 0.000 title claims abstract description 36
- 239000011248 coating agent Substances 0.000 title claims abstract description 29
- 238000000576 coating method Methods 0.000 title claims abstract description 29
- 238000000034 method Methods 0.000 title claims description 18
- ZCDOYSPFYFSLEW-UHFFFAOYSA-N chromate(2-) Chemical compound [O-][Cr]([O-])(=O)=O ZCDOYSPFYFSLEW-UHFFFAOYSA-N 0.000 claims abstract description 22
- 239000007864 aqueous solution Substances 0.000 claims description 16
- 238000010422 painting Methods 0.000 claims description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- 239000000463 material Substances 0.000 abstract description 17
- 238000005452 bending Methods 0.000 abstract description 13
- 239000003513 alkali Substances 0.000 abstract description 11
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 abstract description 9
- 238000007654 immersion Methods 0.000 abstract description 6
- 229910000831 Steel Inorganic materials 0.000 abstract description 4
- 239000010959 steel Substances 0.000 abstract description 4
- 238000005260 corrosion Methods 0.000 abstract description 3
- 230000007797 corrosion Effects 0.000 abstract description 3
- 238000001035 drying Methods 0.000 abstract description 3
- 238000004532 chromating Methods 0.000 abstract 3
- 238000004299 exfoliation Methods 0.000 abstract 1
- 239000003973 paint Substances 0.000 description 26
- 230000000694 effects Effects 0.000 description 11
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 4
- 229910052804 chromium Inorganic materials 0.000 description 4
- 239000011651 chromium Substances 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- 239000002390 adhesive tape Substances 0.000 description 2
- 239000002585 base Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000005238 degreasing Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229920001225 polyester resin Polymers 0.000 description 2
- 239000004645 polyester resin Substances 0.000 description 2
- 229920000298 Cellophane Polymers 0.000 description 1
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 239000012298 atmosphere Substances 0.000 description 1
- 238000010349 cathodic reaction Methods 0.000 description 1
- 229910001430 chromium ion Inorganic materials 0.000 description 1
- 239000008119 colloidal silica Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 239000013527 degreasing agent Substances 0.000 description 1
- 210000003127 knee Anatomy 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 208000014451 palmoplantar keratoderma and congenital alopecia 2 Diseases 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 238000007788 roughening Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 229910000077 silane Inorganic materials 0.000 description 1
- 125000005372 silanol group Chemical group 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Landscapes
- Application Of Or Painting With Fluid Materials (AREA)
- Laminated Bodies (AREA)
- Chemical Treatment Of Metals (AREA)
Abstract
Description
【発明の詳細な説明】
〈産業上の利用分野〉
この発明は、Ｍ＋、１面との密着性に優れた塗膜を付与
するためのステンレス鋼の塗装処理方法に関する。DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a coating treatment method for stainless steel for applying a coating film having excellent adhesion to an M+ surface.
〈従来技術とその課題〉
近年、ステンレス鋼に塗装を施した所謂“カラステンレ
ス゛の需要が急増しているが、ごれし、１プレコート鋼
材の一種であり、通常は成形加」二を施されて使われる
のが一般的である。従って、上記塗装ステンレス鋼材に
あっては、例えば曲げ加工した部分で塗膜剥離が起きる
ようなことがあってはならないが、市販されている通常
の塗装ステンレス鋼板では、１８０°密着曲げのような
厳しい加工を受けると曲げ部の塗膜に剥離が生しるのが
実情であった。<Prior art and its issues> In recent years, the demand for so-called "painted stainless steel", which is coated stainless steel, has rapidly increased. It is commonly used. Therefore, with the above-mentioned painted stainless steel materials, for example, the paint film should not peel off at the bent part, but with ordinary painted stainless steel sheets on the market, there is The reality is that when subjected to severe processing, the paint film on the bent portions peels.
ただ、塗装ステンレス鋼材（殆んどが鋼板）の用途とし
ては現在のところ建築物の屋根材が圧倒的に多く、この
場合にはあまり厳しい加工が行われないため、２丁曲げ
（同材を２枚挟んで１８０６曲げする）で塗膜が剥離し
なげれば十分とされている。しかしながら、塗装ステン
レス鋼材の用途は屋根材だけでなく、ＯＡ機器、家電製
品、自動車部品等の分野にも広がりつつあり、１８０°
密着曲げを行っても剥離しない性能が要求される場合も
増えてくることが予想される。However, currently the overwhelming majority of uses for painted stainless steel materials (mostly steel plates) are for roofing materials for buildings, and in this case, very severe processing is not required, so two-way bending is required. It is said that it is sufficient if the coating film does not peel off by sandwiching two sheets and bending them 1806 times. However, the use of painted stainless steel materials is not only for roofing materials, but is also expanding into fields such as OA equipment, home appliances, and automobile parts.
It is expected that there will be an increase in the number of cases where performance is required to prevent peeling even when bending in close contact.
従来、このような要求に対する塗膜の密着性向上手段と
しては、
（ａｌプラス１〜処理等の方法でステンレス鋼表面を粗
面化し、アンカー効果等を利用して塗膜の密着力を高め
る方法
（ｂｌ塗装に先立ってクロメート処理等の化成処理を施
す方法（特開昭５７−１６１０６９号）。Conventionally, methods for improving the adhesion of paint films to meet these demands include methods such as roughening the stainless steel surface using methods such as Al Plus 1 treatment and increasing the adhesion of paint films by utilizing anchor effects, etc. (A method of performing chemical conversion treatment such as chromate treatment prior to BL painting (Japanese Patent Application Laid-open No. 161069/1983).
（ｂ）シランカップリング処理による方法（特開昭５６
−６９３７６号）。(b) Method using silane coupling treatment (Unexamined Japanese Patent Publication No. 56
-69376).
等が知られている。etc. are known.
しかし、前記ｆａｌ法の場合には、成る程度は密着力を
高めることができるもののその効果は十分でない上、粗
面化した基材表面の凹凸が大きいために塗装後の表面も
平滑性に欠けるものとなり、外観性が劣る結果となって
しまう。一方、前記（ｂ）法では、腐食性の強い環境で
使用される場合の塗膜Ｉ、す離を防止するための効果は
大きいが、１８０゜密着面げのような厳しい成形加工を
施した場合の塗膜剥離を防止する効果は十分でなかった
。また、前記Ｆｅ２法では、これとは逆に、成形加工に
よる塗膜剥離を防止する効果は大きいが、腐食性環境で
の塗膜剥離を防止する効果が劣るものであった。However, in the case of the above-mentioned fal method, although it is possible to increase the adhesion to some extent, the effect is not sufficient, and the roughened surface of the base material has large irregularities, so the surface after painting lacks smoothness. This results in poor appearance. On the other hand, method (b) is highly effective in preventing the coating film from peeling when used in a highly corrosive environment, but it does not require severe forming processes such as 180° close-contact surface chamfering. In some cases, the effect of preventing paint film peeling was not sufficient. In addition, in the Fe2 method, on the contrary, the effect of preventing paint film peeling due to molding was great, but the effect of preventing paint film peeling in a corrosive environment was poor.
このようなことから、本発明が目的としたのは、１８０
°密着曲げのような厳しい成形加工に耐えることができ
、しかも厳しい腐食性環境においても塗膜剥離が生じな
い塗装ステンレス鋼板を実現する手段を確立することで
あった。For this reason, the purpose of the present invention is to
The objective was to establish a means to realize a coated stainless steel sheet that can withstand severe forming processes such as tight bending and that does not peel off the coating even in harsh corrosive environments.
く課題を解決するための手段〉
本発明は、上記目的を達成すべく鋭意重ねられた本発明
者等の研究結果等に基づいて完成されたものであり、
［ステンレス鋼を濃度：１．５Ｎ（規定）以上、温度＝
８０℃以上の強アルカリ水溶液中に浸漬してステンレス
鋼表面の酸化皮膜を改質した後、水洗して乾燥し、この
後２００分間以内にそのまま塗装するか、或いは２００
分間以内に塗布型クロメ−１−−３＝
処理を施し、それから塗装することによって、塗膜密着
性の優れたステンレス鋼材を安定して実現し得るように
した点」
に大きな特徴を有している。Means for Solving the Problems> The present invention has been completed based on the research results of the present inventors, etc., which have been diligently repeated in order to achieve the above objects. (Regulation) or higher, temperature =
After modifying the oxide film on the stainless steel surface by immersing it in a strong alkaline aqueous solution at 80°C or higher, wash it with water and dry it, then paint it as is within 200 minutes, or
The major feature is that it is possible to stably produce stainless steel materials with excellent paint film adhesion by applying coating type chrome 1--3 = treatment and then painting within minutes. There is.
ここで、本発明で対象とするステンレス鋼の種類につい
ては格別な制限はない。また、使用する「強アルカリ水
溶液」としては、アルカリの濃度が１．５Ｎ以上であれ
ばアルカリの種類を問わないが、中でもＮａＯＨ水溶液
が実用的であると言える。Here, there are no particular restrictions on the type of stainless steel that is the object of the present invention. The "strong alkali aqueous solution" to be used may be any type of alkali as long as the alkali concentration is 1.5N or more, but an NaOH aqueous solution is said to be the most practical.
〈作用〉
さて、塗装ステンレス鋼材の素材として一般的な「市販
のステンレス鋼板」は、その表面仕様が“２Ｂ″や“２
Ｄ”のような酸洗仕上げしたもの、“ＢＡ″のように非
酸化性雰囲気で光輝焼鈍したもの、 “ＨＬ（ヘヤーラ
イン）”や“Ｎ０９４°°のように研磨仕上げしたもの
、及び“ハード材”のように冷間圧延したままのものが
あり、何れも、それらの表面はＣｒ、 Ｆｅ、 Ｓｉ、
Ｍｎ等の薄い酸化膜（通常数十オングストローム）に
覆われている。<Function> Now, "commercially available stainless steel sheets" that are commonly used as materials for painted stainless steel materials have surface specifications of "2B" and "2B".
D” with pickled finish, “BA” with bright annealing in a non-oxidizing atmosphere, “HL (Hairline)” and “N094°°” with polished finish, and “Hard”. There are some materials that have been cold-rolled, such as "Materials", and their surfaces are made of Cr, Fe, Si,
It is covered with a thin oxide film (usually several tens of angstroms) such as Mn.
これらの酸化膜は必ずしも塗膜やその前処理としてのク
ロメート膜との親和性が良くないので、前記の１８０°
密着曲げのような試験を行うと、成る場合には塗膜剥離
しないのに別のチャンスには剥離すると言うように、密
着性のバラツキが大きい。These oxide films do not necessarily have good affinity with the coating film or the chromate film used as a pretreatment for the coating film, so the 180°
When tests such as adhesion bending are performed, there is a large variation in adhesion, as in some cases the coating will not peel off, but in other cases it will peel off.
ところが、本発明者等は、ステンレス鋼を塗装する前に
強アルカリ水溶液中に浸漬すると、前記酸化膜の一部が
溶解すると同時に塗膜やクロメートとの親和性の良いも
のに改質され、これらとの密着性のレベルが向上して密
着面げによる塗膜剥離が非常に少なくなることを見出し
たのである。However, the present inventors discovered that when stainless steel is immersed in a strong alkaline aqueous solution before painting, part of the oxide film dissolves and at the same time is modified to have a good affinity with the paint film and chromate. They have found that the level of adhesion between the paint and the paint is improved, and peeling of the coating due to adhesion is greatly reduced.
この理由は、現在のところ完全には解明されていないが
、強アルカリ中に浸漬することによって酸化膜中の極性
基（−〇［■等）や結合水が増加し、これが塗料やクロ
メート液中の極性基と配位結合（水素結合）するためで
はないかと考えられる。The reason for this is not completely understood at present, but immersion in strong alkali increases the amount of polar groups (-〇[■, etc.) and bound water in the oxide film, which can be absorbed into paints and chromate solutions. This is thought to be due to the coordination bond (hydrogen bond) with the polar group of .
ここで言う「強アルカリ水溶液中に浸漬する処理」は、
一般に知られている“アルカリ脱脂処理”とは目的・作
用が異なる。即ち、“アルカリ脱脂処理”は表面に付着
している油汚れを溶解すれば良いのに対して、ここで言
う「強アルカリ水溶液中に浸漬する処理」はステンレス
鋼表面の酸化皮膜を改質する必要があるので、より強い
作用を与える条件を設定する必要がある。従って、処理
水溶液の温度は８０°Ｃ以」二（好ましくは９０℃以上
）に、またアルカリの濃度は少なくとも１．５Ｎ以ヒ（
好ましくは２Ｎ以上、より望ましくは３Ｎ以上）とする
必要がある。この条件から外れると所望の効果を得るこ
とはできない。なお、処理時間は３０秒〜５分間程度が
適当である。また、使用するアルカリ水溶液はＮａＯＨ
等の強アルカリの水溶液又はこれを主成分としたもので
あり、例えば市販のアルカリ脱脂剤（表面活性剤含有）
をこの目的で使用することもできる。The "treatment of immersion in a strong alkaline aqueous solution" mentioned here is
The purpose and action are different from the generally known "alkaline degreasing treatment". In other words, while "alkaline degreasing treatment" only dissolves oil stains attached to the surface, "treatment by immersion in a strong alkaline aqueous solution" here modifies the oxide film on the surface of stainless steel. Therefore, it is necessary to set conditions that give a stronger effect. Therefore, the temperature of the treated aqueous solution should be 80°C or higher (preferably 90°C or higher), and the alkali concentration should be at least 1.5N or higher (preferably 90°C or higher).
(preferably 2N or more, more desirably 3N or more). If this condition is not met, the desired effect cannot be obtained. Note that the appropriate processing time is about 30 seconds to 5 minutes. In addition, the alkaline aqueous solution used is NaOH
An aqueous solution of a strong alkali such as, or a solution containing this as the main component, such as a commercially available alkaline degreaser (containing a surfactant)
can also be used for this purpose.
更に、ここで注意しなければならないことは、１強アル
カリ水溶液中に浸漬する処理」の完了から次の工程の塗
装又は塗布型クロメート処理までの時間が長いと塗膜の
密着性が悪くなると言うことである。これは、アルカリ
処理によって増加したステンレス鋼表面の極性基や結合
水が空気中に放置されることによって徐々に減少するた
めと考えられる。従って、ステンレス鋼を強アルカリ水
溶液中に浸漬して表面の酸化膜を改質し、水洗、乾燥す
る処理を完了した後は、２００分以内に塗装又は塗布型
クロメ−１・処理を実施する必要がある。Furthermore, it must be noted that if the time from the completion of the immersion treatment in a strong alkaline aqueous solution to the next step of painting or paint-on chromate treatment is long, the adhesion of the paint film will deteriorate. That's true. This is thought to be because the polar groups and bound water on the stainless steel surface, which increased due to the alkali treatment, gradually decrease when left in the air. Therefore, after completing the treatment of immersing stainless steel in a strong alkaline aqueous solution to modify the oxide film on the surface, washing with water, and drying, it is necessary to perform painting or coating-type chrome-1 treatment within 200 minutes. There is.
適用する塗料としては、１０００曲げのような厳しい成
形加工を行う場合には塗膜自身が十分に成形性の良いも
のを使う必要があり、この意味では高分子ポリエステル
樹脂系塗料が適している。As for the paint to be applied, when performing severe molding processing such as 1000 bending, it is necessary to use a paint film with sufficient moldability, and in this sense, a high molecular weight polyester resin paint is suitable.
しかし、必ずしもこれに限定されるものではなく、本発
明においては何れの種類の塗料を適用しても優れた密着
性が確保される。However, the present invention is not necessarily limited to this, and excellent adhesion is ensured no matter which type of paint is applied.
なお、前記［−強アルカリ水溶液中に浸漬する処理」を
行った後、塗装の前に塗布型クロメ−ト処理を施すと曲
げ加工に対する耐剥離性が向上し、同時に腐食環境に曝
された場合の塗膜剥離も防止できることから、必要に応
して塗装の前に塗布型クロメート処理を施すのが良い。Furthermore, if a coating-type chromate treatment is applied after performing the above-mentioned [- treatment of immersion in a strong alkaline aqueous solution] and before painting, peeling resistance against bending will be improved, and at the same time, when exposed to a corrosive environment. Since it can also prevent the paint film from peeling off, it is recommended to perform a coating type chromate treatment before painting if necessary.
塗布型クロメ−１〜処理剤としては従来から知られ、市
販されていたもので十分であり、例えばクロム酸イオン
と３価クロムイオンを主成分とし、これにコロイド状シ
リカや有機樹脂を添加した水溶液等が用いられる。塗布
型クロメート処理に当っては、上記処理溶液をステンレ
ス鋼表面に極く薄く塗布し、１００℃程度で乾燥して非
晶質の皮膜を形成させる。塗布量はステンレス鋼の表面
粗さ等に応じて最適量を見出す必要があるが、通常、ク
ロム量が５〜１００ｍｇ／ｍ２程度になるように均一に
塗布すれば良い。なお、塗布型クロメート皮膜が金属表
面に付着するメカニズムについては既に報告されたもの
があるが、クロメート処理剤中のシリカ（ＳｉＯ□）の
シラノール基（Ｓｔ−ＯＨ）が金属表面の極性基（例え
ば−ＯＨ）や結合水と水素結合するようなことが考えら
れている。It is sufficient to use coating-type chromate-1 treatment agents that have been known and are commercially available. For example, treatment agents containing chromate ions and trivalent chromium ions as main components, to which colloidal silica and organic resin are added. An aqueous solution or the like is used. In the coating type chromate treatment, the above treatment solution is applied very thinly to the surface of stainless steel and dried at about 100° C. to form an amorphous film. It is necessary to determine the optimum amount of coating depending on the surface roughness of the stainless steel, etc., but it is usually sufficient to uniformly coat the chromium so that the amount of chromium is about 5 to 100 mg/m2. The mechanism by which a paint-type chromate film adheres to a metal surface has already been reported, but the silanol group (St-OH) of silica (SiO□) in the chromate treatment agent forms a polar group (e.g. -OH) or hydrogen bonding with bound water.
また、塗布型クロメート処理が腐食環境での塗膜剥離を
防止するメカニズムについては、クロメート皮膜がステ
ンレス鋼の腐食反応のうちのカソード反応（０２＋２
Ｈ２Ｏ＋ ４ ｅ −４，ＯＨ−）を抑制する強い働き
を有し、これが関与しているものと＝８−
考えられる。Furthermore, regarding the mechanism by which the applied chromate treatment prevents paint film peeling in corrosive environments, the chromate film is one of the cathodic reactions (02+2) of the corrosion reactions of stainless steel.
It has a strong effect of suppressing H2O+ 4e -4,OH-), and this is thought to be involved.
続いて、本発明を実施例によって史にＦ（体的に説明す
る。Next, the present invention will be concretely explained using examples.
〈実施例〉
数種の市販ステンレス薄鋼板（板厚：０．４ｍｍ、表ｉ
Ｔ＋７仕様二ＢＡ又は２Ｂ）を種々の条件で強アルカリ
水溶液に浸漬し、水洗、乾燥後１〜３００分経過してか
ら塗布型クロメ−１−処理した（なお、一部のものにつ
いては塗布型りｌ゛１メ−１・処理は省略しアルカリ処
理のみとした）。塗布型り１．＋ノー１へ処理は、日本
ペイント株式会社製の塗布型クロメート処理剤たる「ア
ロジンＮＲＣ３００Ｊ （商品名〕を用い、これをク
ロム量が１０ｍｇ／ｍ２になるように塗布して１００℃
で１分間乾燥する方法によった。<Example> Several types of commercially available stainless thin steel plates (thickness: 0.4 mm, Table i
T+7 specification 2BA or 2B) was immersed in a strong alkaline aqueous solution under various conditions, washed with water, and after 1 to 300 minutes had passed, it was treated with coating type chromium-1. (The 1-1 treatment was omitted and only the alkali treatment was used.) Coating mold 1. + No 1 treatment was carried out using Nippon Paint Co., Ltd.'s coating type chromate treatment agent "Alodine NRC300J (trade name)", which was applied so that the amount of chromium was 10 mg/m2, and heated at 100°C.
I used a method of drying it for 1 minute.
続いて、高分子ポリエステル樹脂系塗料を２コート・２
ベーク（膜厚はプライマー：５μｍ ＋） ソプコ−１
−：１５μ１１１）で塗布した。Next, apply 2 coats of high-molecular polyester resin paint.
Bake (film thickness: primer: 5 μm +) Sopko-1
-: 15μ111).
なお、この時の処理条件を第１表に示す。Note that the processing conditions at this time are shown in Table 1.
次に、このようにして得られた各塗装ステンレス鋼板に
つき、塗膜性能（密着性）の調査を実施した。Next, the coating film performance (adhesion) of each coated stainless steel plate thus obtained was investigated.
塗膜性能（密着性）は次の方法によって評価した。Coating film performance (adhesion) was evaluated by the following method.
八） Ｊ ８０ °ｉ：喧疹’ｎｂ□□ヒｌ！−エー−
ゴシ□−トス□；乏ニー＝＝□−四ＪじＵ＾３Ｊ（（□
第１図に示した如く、塗装面を外側にして内面か密着す
るまで曲げ加工した後、曲げ面にセロハン粘着テープを
貼り（＝Ｊげて引き剥がし、この時の塗膜の剥離状況を
５段階で評価した。8) J 80 °i: Noise'nb□□Hil! -A-
Goshi □ - Toss □; Poor knee = = □ - 4Jji U^3J ((□
As shown in Figure 1, after bending the painted surface to the outside until it is in close contact with the inner surface, apply cellophane adhesive tape to the bent surface and peel it off. Evaluated in stages.
１１）ｎ目エリ３（±３へ張隅し一〇へＳ−旦ｊへ１次
−塗装ステンレス鋼板の塗装面に、第２図に示す如＜、
カッターナイフを用いて１１曹間隔で１１本の素地に達
する切り疵を左右及び上下方向に与えた後、この疵付部
を７ ｍｍｍエリ上ン張出し加工し１、ＩＴＳＤＯ２０
１に従ってキャス（ＣＡＳＳ）試験した。但し、腐食を
促進するために、１６時間スプレー噴霧した後８時間停
止し、結晶塩を析出させる手法を採用した。そして、：
１−ヤス試験後、試験片を水洗し乾燥してからエリクセ
ン張出し加工部にセ「Ｊハン粘着テープを貼り付けて引
き剥がし、この１１１の塗膜の剥離状況を５段階で評価
した。11) On the painted surface of the n-th area 3 (+/-3) and the painted surface of the stainless steel plate, as shown in Figure 2,
After using a cutter knife to make 11 scratches reaching the substrate at 11-inch intervals in the horizontal and vertical directions, the scratched areas were overhanged by 7 mm to form 1, ITSDO20.
The CASS test was carried out according to 1. However, in order to accelerate corrosion, a method was adopted in which spraying was continued for 16 hours and then stopped for 8 hours to precipitate crystalline salts. and,:
1- After the Yass test, the test piece was washed with water and dried, and then adhesive tape was applied to the Erichsen overhang and peeled off, and the peeling status of the coating film of 111 was evaluated on a 5-grade scale.
これらの試験結果を第１表に併せて示す。These test results are also shown in Table 1.
第１表に示される結果からも明らかなように、本発明で
規定する条件に従って塗装された塗装処理ステンレス鋼
板では何れも良好な塗膜密着性を示すのに対して、アル
カリ処理液濃度が１．５Ｎを下回ったり、アルカリ処理
液温度が８０°Ｃ未満でありたり、またアルカリ処理か
ら塗装又は塗布型クロメート処理までの経過時間が２０
０分を超えた場合には、１８０°密着曲げにより塗膜剥
離を生じることが分かる。As is clear from the results shown in Table 1, all the coated stainless steel sheets coated according to the conditions specified in the present invention show good coating film adhesion, whereas the alkaline treatment solution concentration of 1 .5N, the alkaline treatment liquid temperature is less than 80°C, or the elapsed time from alkali treatment to painting or applied chromate treatment is 20%.
It can be seen that when the time exceeds 0 minutes, the coating film peels off due to 180° close bending.
ただ、本発明に従った処理であっても、塗布型クロメー
ト処理を施さない場合には、１８０°密着曲げによる塗
膜剥離が塗布型クロメート処理を施したものよりやや起
こり易くなると同時に、キャス試験による塗膜剥離も生
し易い傾向となることも窺える。この結果から、塗布型
クロメート処理は厳しい腐食環境での塗膜剥離を防くた
めに顕著な効果を有すると同時に、曲げ加工による塗膜
剥離を防止する上でも効果があることは明らかであり、
それ故、塗装の前に塗布型クロメート処理を施すことが
望ましいと結論される。However, even with the treatment according to the present invention, if coating-type chromate treatment is not applied, coating peeling due to 180° close bending will occur more easily than in cases where coating-type chromate treatment is applied. It can also be seen that there is a tendency for paint film peeling to occur easily. From these results, it is clear that the applied chromate treatment has a remarkable effect on preventing paint film peeling in severe corrosive environments, and is also effective in preventing paint film peeling due to bending.
Therefore, it is concluded that it is desirable to apply a wet chromate treatment before painting.
〈効果の総括〉
以上に説明した如く、この発明によれば、厳しい成形加
工にも耐え得る優れた塗膜密着性を示し、しかも厳しい
腐食性環境においても塗膜剥離を生しることのない塗装
ステンレス鋼板を工業的に安定して提供することが可能
となるなど、産業上有用な効果がもたらされる。<Summary of Effects> As explained above, the present invention exhibits excellent paint film adhesion that can withstand severe molding processes, and does not cause paint film peeling even in harsh corrosive environments. Industrially useful effects are brought about, such as making it possible to provide coated stainless steel sheets industrially and stably.
第１図は、１８０°密着曲げ試験の説明図である。
第２図は、基盤目エリクセン張出し加工の海洋説明図で
ある。
出願人 日本ステンレス株式会社FIG. 1 is an explanatory diagram of a 180° close bending test. FIG. 2 is a marine explanatory diagram of Erichsen overhang processing of the base. Applicant Nippon Stainless Co., Ltd.
Claims (2)
℃以上の強アルカリ水溶液中に浸漬してステンレス鋼表
面の酸化皮膜を改質した後、水洗して乾燥し、この後２
００分間以内に塗装することを特徴とする、ステンレス
鋼の塗装処理方法。(1) Stainless steel concentration: 1.5N or more, temperature: 80
After modifying the oxide film on the stainless steel surface by immersing it in a strong alkaline aqueous solution at a temperature of ℃ or higher, it is washed with water and dried, and then
A method for painting stainless steel, characterized by painting within 0.00 minutes.
℃以上の強アルカリ水溶液中に浸漬してステンレス鋼表
面の酸化皮膜を改質した後、水洗して乾燥し、この後２
００分間以内に塗布型クロメート処理を施してから塗装
することを特徴とする、ステンレス鋼の塗装処理方法。(2) Concentration of stainless steel: 1.5N or more, temperature: 80
After modifying the oxide film on the stainless steel surface by immersing it in a strong alkaline aqueous solution at a temperature of ℃ or higher, it is washed with water and dried, and then
A method for painting stainless steel, characterized in that coating is performed after application-type chromate treatment within 0 minutes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32533690A JPH04198487A (en) | 1990-11-29 | 1990-11-29 | Method for coating stainless steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32533690A JPH04198487A (en) | 1990-11-29 | 1990-11-29 | Method for coating stainless steel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04198487A true JPH04198487A (en) | 1992-07-17 |
Family
ID=18175671
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP32533690A Pending JPH04198487A (en) | 1990-11-29 | 1990-11-29 | Method for coating stainless steel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04198487A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011058032A (en) * | 2009-09-08 | 2011-03-24 | Nippon Parkerizing Co Ltd | Surface-treated black ferrous metal material and manufacturing method thereof |
-
1990
- 1990-11-29 JP JP32533690A patent/JPH04198487A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011058032A (en) * | 2009-09-08 | 2011-03-24 | Nippon Parkerizing Co Ltd | Surface-treated black ferrous metal material and manufacturing method thereof |
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