JPS6315349B2 - - Google Patents
Info
- Publication number
- JPS6315349B2 JPS6315349B2 JP57101408A JP10140882A JPS6315349B2 JP S6315349 B2 JPS6315349 B2 JP S6315349B2 JP 57101408 A JP57101408 A JP 57101408A JP 10140882 A JP10140882 A JP 10140882A JP S6315349 B2 JPS6315349 B2 JP S6315349B2
- Authority
- JP
- Japan
- Prior art keywords
- coloring
- stainless steel
- treatment
- pretreatment
- aqueous solution
- 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
- 238000004040 coloring Methods 0.000 claims description 50
- 229910001220 stainless steel Inorganic materials 0.000 claims description 41
- 239000010935 stainless steel Substances 0.000 claims description 39
- 238000000034 method Methods 0.000 claims description 26
- 239000007864 aqueous solution Substances 0.000 claims description 15
- 238000002203 pretreatment Methods 0.000 claims description 11
- 239000000243 solution Substances 0.000 claims description 5
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 4
- KRVSOGSZCMJSLX-UHFFFAOYSA-L chromic acid Substances O[Cr](O)(=O)=O KRVSOGSZCMJSLX-UHFFFAOYSA-L 0.000 claims description 4
- AWJWCTOOIBYHON-UHFFFAOYSA-N furo[3,4-b]pyrazine-5,7-dione Chemical compound C1=CN=C2C(=O)OC(=O)C2=N1 AWJWCTOOIBYHON-UHFFFAOYSA-N 0.000 claims description 4
- 229910017604 nitric acid Inorganic materials 0.000 claims description 4
- 239000010410 layer Substances 0.000 description 17
- 238000004519 manufacturing process Methods 0.000 description 8
- 239000007788 liquid Substances 0.000 description 7
- 239000000463 material Substances 0.000 description 6
- 230000001590 oxidative effect Effects 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- 230000002378 acidificating effect Effects 0.000 description 3
- 238000004090 dissolution Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 238000005238 degreasing Methods 0.000 description 2
- 238000005868 electrolysis reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 239000012670 alkaline solution Substances 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 239000002345 surface coating layer Substances 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Landscapes
- Chemical Treatment Of Metals (AREA)
- Other Surface Treatments For Metallic Materials (AREA)
Description
本発明はステンレス鋼を着色するに際しそのス
テンレス鋼の製造履歴によつて生じるわずかな表
面性状の差に起因する着色色差や同一ステンレス
鋼内に生じる色むらを解消する着色前処理方法に
関するものである。
近年、ステンレス鋼の着色に関する技術は急速
な進歩を遂げ、数多くの技術が開示されている。
中でも特開昭48−11243号、特開昭49−21339号に
開示されている着色方法はそれまでの方法に比べ
再現性があり、また優れた耐摩耗性を持たせるこ
とも出来、このような着色方法が開発されて以
来、ステンレス鋼の着色に関する関心は一段と高
まり、多くの着色ステンレス鋼の製品が生産され
るようになつて来ている。しかしながらこのよう
なステンレス鋼の着色方法だけでは同一条件で着
色処理を施しても極くわずかな表面状態の差によ
り同一ステンレス鋼板内においてさえも色差が生
じたり、製造履歴の異なるステンレス鋼において
は、異なつた色彩に着色されていた。
そこでこのような問題点を解決するため、着色
する前にステンレス鋼を均一にしようとすること
が試みられている。例えば特開昭51−47545号に
はステンレス鋼表面の表面皮膜層及び変質層を除
去して均一な表面を得る着色前処理方法が開示さ
れている。この方法を図に示すステンレス鋼板の
表面構造モデルで説明する。図中、Ａはステンレ
ス鋼製造時に生成された表面皮膜であり不動態化
されている。Ｂは表面近傍の地鋼の一部が製造工
程中に変質した変質層であり、Ｃは変質されてい
ない地鋼である。特開昭51−47545号の着色前処
理方法では第１図の表面構造モデルにおいてＡ，
Ｂ両層を溶解除去しているが、このような着色前
処理方法では、地鋼の一部をも溶解してしまうの
で、元の表面外観を維持することが困難である。
例えば光輝焼鈍板であるBA仕上げ材を特開昭51
−47545号の着色前処理方法で処理すると、処理
板の光沢を著しく低下せしめ、商品価値を下落さ
せてしまうのである。またステンレス鋼板は着色
処理を施される前に一般に脱脂工程を経るが、こ
の脱脂工程では通常アルカリ溶液中で電解洗浄が
行われて図の層Ａの一部に影響を与えるだけで表
面の均一化までに至らず、満足な結果は得られて
いない。従つてステンレス鋼を色むらなくそして
製造履歴の相違による色差もなく着色するための
着色前処理方法の出現が望まれていた。
本発明者等はこのような要請に応えることを目
的に鋭意研究し、先ず着色処理工程の着色皮膜の
形成過程を検討した結果、着色皮膜は図の層Ａが
一部溶解された後にその上に形成されて行くこ
と、従つて着色を均一にするためのステンレス鋼
表面の均一性は層Ａのみを対象とすればよいこと
が判明した。そのことから層Ｂの溶解を出来るだ
け抑制し層Ａのみを均一にする着色前処理を施せ
ば、表面外観の大きな変化もなく着色処理工程で
均一な着色面が得られ、従つて同一ステンレス鋼
板内は勿論、製造ロツトが異なるステンレス鋼で
も同一の色に着色することが出来ると基本的な考
えを建てることができた。そこで本発明者等は表
面皮膜である層Ａを均一にし層Ｂの溶解を出来る
だけ抑制する表面処理方法を求めて種々検討した
結果、酸性でしかも酸化性の水溶液中で特定の低
電流密度の陽極電解処理を施す方法に到達し、こ
れにより目的を達成できることを究明して本発明
を完成した。
すなわち本発明は、ステンレス鋼の着色に際し
てステンレス鋼を着色する前に、10〜30％（重
量）の硝酸水溶液とCrO3を５〜100g/含有する
クロム酸水溶液との中から選ばれる前処理液中
で、0.05A/dm2〜0.4A/dm2の電流密度の範囲で陽
極電解処理して表面から進んで変質層の一部に及
ぶことのある溶解作用により表面皮膜の少なくと
も大部分を除去すると共に酸化皮膜を形成せしめ
ることを特徴とする着色ステンレス鋼着色前処理
方法に関するものである。
以下に本発明方法を詳細に説明する。
本発明方法の中心的な技術的思想はステンレス
鋼に酸性且つ酸化性の前処理液中で特に低い電流
密度の陽極電解処理を施すことにより層Ａの全部
または大部分（80％以上）を溶解除去すると共に
酸化皮膜を形成せしめることであり、この際変質
層の一部（10％以下）が溶解除去されることは差
し支えない。この酸性且つ酸化性の前処理液とし
て硝酸とクロム酸水溶液との中から選ばれた水溶
液が用いられる。その理由は陽極電解処理を施し
たときに水溶液が中性またはアルカリ性であると
被処理材であるステンレス鋼の表面よりO2等の
ガスが発生するのみでステンレス鋼の表面皮膜の
溶解が全く行われないからステンレス鋼の表面は
均一化されず、また処理水溶液が酸化性のない例
えばリン酸、塩酸、硫酸等の水溶液である場合は
表面皮膜及びステンレス鋼の変質層の甚だしい溶
解が起こり、新しい表面皮膜（酸化皮膜）は形成
されないからステンレス鋼の表面は均一化でき
ず、外観も元の状態を維持することは出来ない。
以上のことから処理水溶液はPHは３以下であり且
つ新しい酸化皮膜を形成せしめるに充分な酸化性
を有することを必要とする。このような条件を満
たす前処理液として、10〜30％（重量）の硝酸水
溶液とCrO3を５〜100g/含有するクロム酸水溶
液との中から選ばれたいずれの水溶液を用いても
良い。これらの各処理水溶液の濃度が上記の各下
限よりも低い場合は酸化性が不充分なためにステ
ンレス鋼変質層の溶解が生じ、また濃度が上記の
各上限よりも高い場合は電解処理時被処理材に電
流密度の不均一が生じやすくなり、着色処理時該
被処理材のエツジ、コーナー部に色むらが発生し
やすくなる。また薬品代による処理コストの上昇
がありそれに見合うだけの効果が得られない。陽
極電解処理を施すときの電流密度の範囲は本発明
における特に重要な事項であり、0.05〜0.4A/dm2
の範囲で良好な結果が得られる。0.05A/dm2未満
では長時間の電解処理が必要であり、一方0.4A/
ｄm2を超えると被処理材の溶解が甚だしくて表面
皮膜は勿論、変質層の殆んど全部さらには地鋼に
まで達して表面状態は一変してしまうと共に不均
一となり、その上被処理材に電流密度の差が生じ
易くなり、これらのことから次の工程で行う着色
処理ではエツジや平坦面などに色むらが生じ易く
て均一な着色が出来難い。また処理時間は30秒〜
10分間の範囲が適当である。処理温度は常温付近
で充分な効果はあるが、40〜60℃に加温する場合
は処理時間は短縮される。上記の陽極電解処理条
件は上記の範囲内でステンレス鋼の表面状態によ
つて適宜定めることができる。本発明では酸化性
ある酸性前処理液中で上記の低い電流密度で陽極
電解処理することにより表面皮膜がほぼ溶解除去
されたところで酸化皮膜を形成せしめてそれ以上
の溶解作用を防止し、均一な表面とすることが出
来るのである。
かくして本発明方法によつて着色前処理を施し
たステンレス鋼は通常の工程に従つてこれに着色
処理を施すことが出来る。
以下実施例によつて本発明方法を更に詳細に説
明する。
実施例１〜２、比較例１〜３
供試材としてSUS304BA仕上げステンレス鋼
板の製造履歴を異にする板厚0.5mm材の試料Ｘと
板厚1.0mm材の試料Ｙとを使用し、これに第１表
に示す組成の前処理液と前処理条件とにより常温
で着色前処理を施した後、各試料に同一条件で着
色処理を施し、得られた各着色試料Ｘ，Ｙ間の色
差を測定した。着色処理はCrO3250g/と
H2SO4500g/の混合水溶液から成る着色液に温
度80℃で各試料を浸漬して行つた。着色の色調は
いずれの試料についても着色液中に浸漬した白金
の参照電極と試料間の電位差を測定して13.0mV
に達したときに試料を着色液から引き揚げ、ほぼ
ゴールド色に着色した。色差の測定は、日立カラ
ーアナライザー430型を用い、JIS Ｚ 8722で規
定されている「２度視野における物体色の測定方
法」に従つた。
また比較のため、着色前処理を施さなかつたこ
と（比較例１）、または本発明方法以外の第１表
に示す着色前処理条件で着色前処理を施したこと
以外は全く同様にして得た着色試料Ｘ，Ｙ間の色
差を測定した。
これらの結果を第１表に示す。
The present invention relates to a coloring pretreatment method for coloring stainless steel, which eliminates color differences caused by slight differences in surface properties caused by the manufacturing history of the stainless steel and color unevenness that occurs within the same stainless steel. . In recent years, technology regarding the coloring of stainless steel has made rapid progress, and many technologies have been disclosed.
Among them, the coloring methods disclosed in JP-A-48-11243 and JP-A-49-21339 have better reproducibility than previous methods and can also provide excellent abrasion resistance. Since the development of coloring methods, interest in the coloring of stainless steel has further increased, and many colored stainless steel products have come into production. However, with this stainless steel coloring method alone, color differences may occur even within the same stainless steel plate due to extremely slight differences in surface condition even if coloring is performed under the same conditions, and stainless steels with different manufacturing histories may It was colored in different colors. In order to solve these problems, attempts have been made to make stainless steel uniform before coloring. For example, JP-A-51-47545 discloses a coloring pretreatment method for removing surface coating layers and deteriorated layers on the surface of stainless steel to obtain a uniform surface. This method will be explained using the surface structure model of a stainless steel plate shown in the figure. In the figure, A is a surface film generated during the manufacture of stainless steel, which is passivated. B is an altered layer in which a part of the raw steel near the surface has been altered during the manufacturing process, and C is an unaltered steel base. In the coloring pretreatment method of JP-A No. 51-47545, A,
Both layers B are dissolved and removed, but with such a coloring pretreatment method, a part of the base steel is also dissolved, making it difficult to maintain the original surface appearance.
For example, BA finishing material, which is a bright annealed plate, was
When treated using the coloring pretreatment method of No. 47545, the gloss of the treated plate is significantly reduced and the commercial value is lowered. In addition, stainless steel sheets generally go through a degreasing process before being colored, but in this degreasing process, electrolytic cleaning is usually performed in an alkaline solution, which only affects part of layer A in the figure, resulting in a uniform surface. However, the results have not yet been achieved and satisfactory results have not been obtained. Therefore, it has been desired to develop a coloring pretreatment method for coloring stainless steel evenly and without color differences due to differences in manufacturing history. The inventors of the present invention conducted extensive research with the aim of meeting such demands, and first examined the process of forming a colored film in the coloring process. It has been found that the uniformity of the stainless steel surface in order to make the coloring uniform needs to be targeted only to layer A. Therefore, if a coloring pretreatment is performed to suppress the dissolution of layer B as much as possible and make only layer A uniform, a uniformly colored surface can be obtained in the coloring process without major changes in surface appearance, and therefore the same stainless steel sheet We were able to formulate the basic idea that even stainless steel from different manufacturing lots could be colored the same color. Therefore, the present inventors conducted various studies in search of a surface treatment method that would make layer A, which is a surface film, uniform and suppress the dissolution of layer B as much as possible. The present invention was completed by arriving at a method of performing anodic electrolytic treatment and by discovering that the object could be achieved by this method. That is, in the present invention, before coloring stainless steel, a pretreatment liquid selected from a 10 to 30% (by weight) nitric acid aqueous solution and a chromic acid aqueous solution containing 5 to 100 g/CrO 3 is used. At least a large part of the surface film is removed by an anodic electrolytic treatment at a current density of 0.05 A/dm 2 to 0.4 A/dm 2 in a dissolving action that may proceed from the surface and reach a part of the altered layer. The present invention relates to a pre-treatment method for coloring stainless steel, which is characterized in that it also forms an oxide film. The method of the present invention will be explained in detail below. The central technical idea of the method of the present invention is to dissolve all or a large part (80% or more) of layer A by subjecting stainless steel to an anodic electrolytic treatment at a particularly low current density in an acidic and oxidizing pretreatment liquid. It is to form an oxide film at the same time as removing it, and at this time, it is okay for a part (10% or less) of the altered layer to be dissolved and removed. As this acidic and oxidizing pretreatment liquid, an aqueous solution selected from nitric acid and chromic acid aqueous solution is used. The reason for this is that if the aqueous solution is neutral or alkaline during anodic electrolysis treatment, gases such as O 2 will be generated from the surface of the stainless steel being treated, and the surface film of the stainless steel will not dissolve at all. If the treated aqueous solution is a non-oxidizing aqueous solution such as phosphoric acid, hydrochloric acid, or sulfuric acid, the surface film and the deteriorated layer of the stainless steel will be severely dissolved, and new Since no surface film (oxide film) is formed, the surface of stainless steel cannot be made uniform and the original appearance cannot be maintained.
From the above, the treated aqueous solution needs to have a pH of 3 or less and have sufficient oxidizing properties to form a new oxide film. Any aqueous solution selected from a 10 to 30% (by weight) nitric acid aqueous solution and a chromic acid aqueous solution containing 5 to 100 g of CrO 3 may be used as the pretreatment liquid that satisfies these conditions. If the concentration of each of these treatment aqueous solutions is lower than each of the above lower limits, the oxidizing property will be insufficient and the altered layer of stainless steel will dissolve, and if the concentration is higher than each of the above upper limits, the deterioration during electrolytic treatment will occur. Non-uniform current density tends to occur in the treated material, and color unevenness tends to occur at the edges and corners of the treated material during coloring treatment. In addition, the treatment cost increases due to the cost of chemicals, and the effects commensurate with this increase cannot be obtained. The current density range when performing anodic electrolytic treatment is a particularly important matter in the present invention, and is 0.05 to 0.4 A/dm 2
Good results can be obtained within this range. Less than 0.05A/dm 2 requires long electrolytic treatment, while 0.4A/dm
If the temperature exceeds dm 2 , the material to be treated will melt to a great extent, reaching not only the surface film but also almost all of the altered layer and even the base steel, completely changing the surface condition and becoming non-uniform. Differences in current density tend to occur between the two, and for this reason, in the coloring treatment performed in the next step, color unevenness tends to occur at edges and flat surfaces, making it difficult to achieve uniform coloring. Also, the processing time is 30 seconds ~
A range of 10 minutes is appropriate. Although sufficient effects can be obtained when the treatment temperature is around room temperature, the treatment time will be shortened if the temperature is raised to 40 to 60°C. The above anodic electrolytic treatment conditions can be appropriately determined within the above range depending on the surface condition of the stainless steel. In the present invention, by carrying out anodic electrolysis treatment in an oxidizing acidic pretreatment solution at the above-mentioned low current density, an oxide film is formed at the point where the surface film has been almost completely dissolved and removed, thereby preventing further dissolution action and uniformly dissolving the surface film. It can be made into a surface. Thus, the stainless steel which has been pre-treated for coloring by the method of the present invention can be subjected to coloring treatment in accordance with the usual process. The method of the present invention will be explained in more detail with reference to Examples below. Examples 1-2, Comparative Examples 1-3 Sample After performing coloring pretreatment at room temperature using the pretreatment liquid with the composition shown in Table 1 and the pretreatment conditions, each sample was subjected to coloring treatment under the same conditions, and the color difference between the obtained colored samples X and Y was It was measured. Coloring treatment with CrO 3 250g/
Each sample was immersed in a colored solution consisting of a mixed aqueous solution of 500 g of H 2 SO 4 at a temperature of 80°C. The color tone of each sample was determined by measuring the potential difference between the platinum reference electrode immersed in the coloring solution and the sample, and it was 13.0 mV.
The sample was withdrawn from the coloring solution when it reached a color of approximately gold. The color difference was measured using Hitachi Color Analyzer Model 430 in accordance with the "method for measuring object color in a 2-degree visual field" specified in JIS Z 8722. For comparison, samples were obtained in exactly the same manner except that no pre-coloring treatment was performed (Comparative Example 1) or that the pre-coloring treatment was performed under the pre-coloring conditions shown in Table 1 other than the method of the present invention. The color difference between colored samples X and Y was measured. These results are shown in Table 1.
【表】
第１表から明らかなように本発明方法によれば
製造履歴を異にするステンレス鋼を原材に使用し
ても、色差の殆んどない着色ステンレス鋼を得る
ことが出来る。
実施例３〜11、比較例４〜８
供試材としてSUS304HL仕上げの板厚1.5mm、
大きさ300mm×300mmのステンレス鋼板を使用し、
第２表に示す種々な組成の前処理液と着色前処理
条件による以外は実施例１〜２と同様に着色前処
理と着色処理を施した。なお、実施例８だけは着
色前処理温度を60℃とした。また比較のため第２
表に示す本発明方法の範囲外（着色前処理なしを
含む）の前処理液と着色前処理条件とによる着色
前処理を施した場合も同様に実施した。得られた
着色試材はランダムに選んだ５個所で実施例１〜
２と同様に色差を測定し、各試材毎に色差の最大
値を求めた。第２表にこの結果を示す。第２表の
結果から明らかなように本発明方法により着色前
処理を施した後に着色すれば同一ステンレス鋼板
内の色むらを少なくすることが出来る。比較例
４，６においてはステンレス鋼素地が少し溶解し
て表面光沢が低下し、元の表面外観を保持できな
かつた。
なおSUS304の代わりにSUS430を使用した実
験においても同様の効果が得られた。[Table] As is clear from Table 1, according to the method of the present invention, colored stainless steel with almost no color difference can be obtained even if stainless steels with different manufacturing histories are used as raw materials. Examples 3 to 11, Comparative Examples 4 to 8 The test material was SUS304HL finished plate thickness 1.5 mm,
Using a stainless steel plate with a size of 300mm x 300mm,
The coloring pretreatment and coloring treatment were performed in the same manner as in Examples 1 and 2, except that the pretreatment liquids having various compositions and the coloring pretreatment conditions shown in Table 2 were used. In addition, only in Example 8, the coloring pretreatment temperature was 60°C. Also, for comparison, the second
The same procedure was carried out in cases where pre-coloring treatment was performed using a pre-treatment liquid and pre-coloring conditions outside the range of the method of the present invention (including no pre-coloring treatment) shown in the table. The obtained colored samples were randomly selected from 5 locations in Examples 1 to 3.
The color difference was measured in the same manner as in 2, and the maximum value of the color difference was determined for each sample. Table 2 shows the results. As is clear from the results in Table 2, if the coloring is performed after the coloring pretreatment by the method of the present invention, color unevenness within the same stainless steel sheet can be reduced. In Comparative Examples 4 and 6, the stainless steel substrate was slightly dissolved, the surface gloss was reduced, and the original surface appearance could not be maintained. A similar effect was obtained in an experiment using SUS430 instead of SUS304.
【表】
＊：比較例４、６では試材の表面光
沢は失われた。
以上詳細に説明したように、本発明方法は従来
の着色前処理方法のようにステンレス鋼の変質層
の大部分を溶解することなく抑制しながら表面皮
膜を溶解除去すると共に酸化皮膜を形成せしめる
ことにより、表面外観の大きな変化なく均一な着
色を行うことを可能とさせるものであり、着色ス
テンレスの品質を向上せしめてその普及を図る上
で価値あるものである。[Table] *: In Comparative Examples 4 and 6, the surface gloss of the test materials was lost.
As explained in detail above, the method of the present invention dissolves and removes the surface film while suppressing most of the altered layer of stainless steel without dissolving it, unlike the conventional coloring pretreatment method, and forms an oxide film. This makes it possible to perform uniform coloring without major changes in the surface appearance, and is valuable in improving the quality of colored stainless steel and promoting its widespread use.
図はステンレス鋼板の表面構造モデルを示す説
明図である。
Ａ…表面皮膜、Ｂ…変質層、Ｃ…地鋼。
The figure is an explanatory diagram showing a surface structure model of a stainless steel plate. A...surface film, B...altered layer, C...base steel.
Claims (1)
着色する前に、10〜30％（重量）の硝酸水溶液と
CrO3を５〜100g/含有するクロム酸水溶液との
中から選ばれる前処理液中で、0.05A/dm2〜0.4
Ａ／ｄm2の電流密度の範囲で陽極電解処理して表面
から進んで変質層の一部に及ぶことのある溶解作
用により表面皮膜の少なくとも大部分を除去する
と共に酸化皮膜を形成せしめることを特徴とする
ステンレス鋼着色前処理方法。 ２ 陽極電解処理を30秒〜10分間行う特許請求の
範囲第１項に記載のステンレス鋼の着色前処理方
法。 ３ 陽極電解処理を処理温度40〜60℃で行う特許
請求の範囲第１項または第２項に記載のステンレ
ス鋼着色前処理方法。[Claims] 1. When coloring stainless steel, before coloring the stainless steel, a nitric acid aqueous solution of 10 to 30% (by weight) is added.
0.05 A/dm 2 to 0.4 in a pretreatment solution selected from a chromic acid aqueous solution containing 5 to 100 g of CrO 3
It is characterized by anodic electrolytic treatment at a current density range of A/dm 2 to remove at least a large part of the surface film and form an oxide film by a dissolving action that proceeds from the surface and may reach a part of the altered layer. A stainless steel coloring pretreatment method. 2. The method for pre-coloring stainless steel according to claim 1, wherein the anodic electrolytic treatment is performed for 30 seconds to 10 minutes. 3. The stainless steel coloring pretreatment method according to claim 1 or 2, wherein the anodic electrolytic treatment is performed at a treatment temperature of 40 to 60°C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10140882A JPS58221283A (en) | 1982-06-15 | 1982-06-15 | Pretreatment of stainless steel before coloring |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10140882A JPS58221283A (en) | 1982-06-15 | 1982-06-15 | Pretreatment of stainless steel before coloring |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58221283A JPS58221283A (en) | 1983-12-22 |
| JPS6315349B2 true JPS6315349B2 (en) | 1988-04-04 |
Family
ID=14299883
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10140882A Granted JPS58221283A (en) | 1982-06-15 | 1982-06-15 | Pretreatment of stainless steel before coloring |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58221283A (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5314758A (en) * | 1992-03-27 | 1994-05-24 | The Louis Berkman Company | Hot dip terne coated roofing material |
| US5397652A (en) * | 1992-03-27 | 1995-03-14 | The Louis Berkman Company | Corrosion resistant, colored stainless steel and method of making same |
| US5491036A (en) * | 1992-03-27 | 1996-02-13 | The Louis Berkman Company | Coated strip |
| JP4606753B2 (en) * | 2004-03-04 | 2011-01-05 | Ｓｕｍｃｏ Ｔｅｃｈｘｉｖ株式会社 | Cooler and ingot manufacturing equipment |
| CN105296988A (en) * | 2015-11-23 | 2016-02-03 | 佛山市高明俊品金属制品有限公司 | Chemical coloring method for stainless steel |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5425893A (en) * | 1977-07-28 | 1979-02-27 | American Hospital Supply Corp | Quantitative determination of amylase |
-
1982
- 1982-06-15 JP JP10140882A patent/JPS58221283A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5425893A (en) * | 1977-07-28 | 1979-02-27 | American Hospital Supply Corp | Quantitative determination of amylase |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58221283A (en) | 1983-12-22 |
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