JP2000309881A - Production of black color galvanized steel sheet excellent in hue stability - Google Patents
Production of black color galvanized steel sheet excellent in hue stabilityInfo
- Publication number
- JP2000309881A JP2000309881A JP11113496A JP11349699A JP2000309881A JP 2000309881 A JP2000309881 A JP 2000309881A JP 11113496 A JP11113496 A JP 11113496A JP 11349699 A JP11349699 A JP 11349699A JP 2000309881 A JP2000309881 A JP 2000309881A
- Authority
- JP
- Japan
- Prior art keywords
- steel sheet
- zinc
- zinc phosphate
- treatment
- galvanized steel
- 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
Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
- C23C22/06—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
- C23C22/34—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing fluorides or complex fluorides
- C23C22/36—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing fluorides or complex fluorides containing also phosphates
- C23C22/362—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing fluorides or complex fluorides containing also phosphates containing also zinc cations
Landscapes
- Chemical & Material Sciences (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Other Surface Treatments For Metallic Materials (AREA)
- Chemical Treatment Of Metals (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、りん酸亜鉛処理に
よる黒色化亜鉛系めっき鋼板の製造方法の改良に関す
る。The present invention relates to an improvement in a method for producing a blackened zinc-based plated steel sheet by zinc phosphate treatment.
【０００２】[0002]
【従来技術】意匠性に優れた住宅・建材用材料として、
りん酸亜鉛処理により黒色化した黒色化亜鉛系めっき鋼
板が例えば特開平３−２２６５８３号公報、特開平５−
２３７４５０号公報等に開示されており、現在実用化さ
れている。このような、黒色化亜鉛系めっき鋼板の量産
方法として、連続ラインにおいて亜鉛系めっき鋼板を短
時間でりん酸亜鉛処理する技術が、特開平８−２１８１
８１号公報に開示されている。2. Description of the Related Art As a material for housing and building materials having excellent design properties,
A blackened zinc-based plated steel sheet blackened by a zinc phosphate treatment is disclosed in, for example, Japanese Patent Application Laid-Open Nos.
No. 237450 and the like, and are currently in practical use. As a method for mass-producing such a blackened zinc-based plated steel sheet, a technique of treating a zinc-based plated steel sheet with zinc phosphate in a continuous line in a short time is disclosed in JP-A-8-2181.
No. 81 discloses this.
【０００３】この方法においては、亜鉛系めっき鋼板を
脱脂して、水洗した後に、Ｔｉ水酸化物粒子含有弱アル
カリ表面調整剤処理液で処理して、Ｎｉイオン含有りん
酸亜鉛処理剤処理液をスプレーすることにより皮膜付着
量が２ｇ／ｍ2以上のりん酸亜鉛皮膜を形成し、鋼板の
色調を明度指数Ｌ値で４５〜６０にするために、前記表
面調整剤処理液のＴｉ水酸化物粒子濃度を３０〜１００
ｐｐｍとし、かつ、前記りん酸亜鉛処理材処理液の全酸
度を、処理液１０ｍｌをフェノールフタレインを指示薬
として中和するのに要する１／１０ＮのＮａＯＨ水溶液
滴定量が４０〜８０ｍｌ、Ｎｉイオン濃度を３．５〜
７．０ｇ／ｌ、温度を６５℃以上にする工程で製造され
る。In this method, a zinc-based plated steel sheet is degreased and washed with water, and then treated with a treatment solution of a weak alkali surface conditioner containing Ti hydroxide particles to obtain a treatment solution of a zinc phosphate treatment agent containing Ni ions. In order to form a zinc phosphate coating having a coating weight of 2 g / m 2 or more by spraying, and to adjust the color tone of the steel sheet to a lightness index L value of 45 to 60, use the Ti hydroxide of the surface conditioner treatment liquid. Particle concentration of 30-100
ppm, and the total acidity of the zinc phosphate treated material treatment liquid was 40 to 80 ml for a 1/10 N NaOH aqueous solution required for neutralizing 10 ml of the treatment solution with phenolphthalein as an indicator, and the Ni ion concentration. From 3.5 to
It is manufactured in a step of adjusting the temperature to 7.0 g / l and a temperature of 65 ° C. or higher.
【０００４】[0004]
【発明が解決しようとする課題】この方法は、連続ライ
ンにおいて短時間で黒色化処理が可能なため、生産性に
優れたものであるが、この方法を用い連続ラインで鋼帯
を処理する場合には、希に、鋼帯の長手方向にＬ値の差
（ΔＬ）が３以上の筋状の色調むらを発生することがあ
った。この程度の色調むらは、例えば屋根材などの外装
建材として使用する場合には、外観上の問題とはならな
いものであるが、近くで見ると色調むらとわかるので、
品質向上のためには解消する必要がある。This method is excellent in productivity because a blackening process can be performed in a short time in a continuous line, but is excellent in productivity. In some cases, streak-like color tone unevenness with a L value difference (ΔL) of 3 or more was generated in the longitudinal direction of the steel strip. For example, when used as an exterior building material such as a roofing material, this level of color unevenness does not cause a problem in appearance, but if you look closely, you can see that the color tone is uneven,
It needs to be resolved to improve quality.
【０００５】本発明は、りん酸亜鉛処理による黒色化亜
鉛系めっき鋼板の製造方法において、鋼帯の幅方向の色
調安定性に優れた製造方法、すなわち、筋状の色調むら
の発生を抑制した製造方法を提供するものである。According to the present invention, there is provided a method for producing a blackened zinc-based plated steel sheet by zinc phosphate treatment, wherein the production method is excellent in color tone stability in the width direction of the steel strip, that is, the generation of streaky color tone unevenness is suppressed. It is intended to provide a manufacturing method.
【０００６】[0006]
【課題を解決するための手段】上記の目的を達成するた
めに、本発明においては、亜鉛めっき鋼板または亜鉛系
合金めっき鋼板を脱脂して、水洗した後、Ｔｉ水酸化物
粒子含有弱アルカリ表面調整剤処理液で処理して、Ｎｉ
イオン含有りん酸亜鉛処理剤処理液をスプレーすること
により皮膜付着量が２ｇ／ｍ2以上のりん酸亜鉛皮膜を
形成し、鋼板の色調を明度指数Ｌ値で４５〜６０にする
黒色化亜鉛系めっき鋼板の製造方法であって、前記りん
酸亜鉛処理剤処理液中のフッ化物イオン濃度を６０〜２
００ｐｐｍにすることを特徴とする黒色化亜鉛系めっき
鋼板の製造方法が提供される。In order to achieve the above object, the present invention provides a method for degreased and galvanized a galvanized steel sheet or a zinc-based alloy-plated steel sheet, and then irradiating the surface with a weak alkaline surface containing Ti hydroxide particles. Treated with a modifier treatment liquid, Ni
A zinc phosphate coating film having a coating weight of 2 g / m 2 or more is formed by spraying a treatment liquid containing an ion-containing zinc phosphate treatment agent, and the color tone of the steel sheet is 45 to 60 in lightness index L value. A method for producing a plated steel sheet, wherein the concentration of fluoride ions in the zinc phosphate treating agent treatment solution is 60 to 2
The present invention provides a method for producing a blackened zinc-based plated steel sheet, characterized in that the concentration is set to 00 ppm.
【０００７】[0007]
【発明の実施の形態】発明者等が検討した結果、この筋
状の色調むらは、連続ラインの各処理槽の出側に設置さ
れたリンガーロールと鋼帯の接触が原因と判明した。す
なわち、リンガーロールによって絞られた鋼帯表面の水
膜の状態の微少な不均一性が、色調むらを引き起こすも
の考えられる。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As a result of investigations by the present inventors, it has been found that the streaky color tone unevenness is caused by contact between a steel strip and a ringer roll installed on the outlet side of each processing tank in a continuous line. That is, it is conceivable that the minute nonuniformity of the state of the water film on the surface of the steel strip squeezed by the ringer roll causes color tone unevenness.
【０００８】りん酸亜鉛処理においては、表面調整処理
後は鋼板が濡れたままの状態でりん酸亜鉛処理されるこ
とが望ましい。しかしながら、連続ラインの場合、りん
酸亜鉛処理の各工程において、前工程の処理液が次工程
の処理液中に混入されるのを防ぐために、処理槽間にリ
ンガーロールが設けられ、このリンガーロールによって
鋼帯表面に付着している処理液が絞り落とされる。リン
ガーロールと鋼帯の接触状態はリンガーロールの形状、
劣化状態および鋼帯の形状等によって微妙に異なってい
る。そして、この表面の水膜の微妙な不均一状態が、そ
の後のりん酸亜鉛結晶の生成に大きな影響を及ぼすもの
と考えられる。In the zinc phosphate treatment, after the surface conditioning treatment, it is desirable that the steel sheet be subjected to the zinc phosphate treatment in a wet state. However, in the case of a continuous line, in each step of the zinc phosphate treatment, a ringer roll is provided between the treatment tanks in order to prevent the treatment liquid of the previous step from being mixed into the treatment liquid of the next step. Thereby, the treatment liquid adhering to the steel strip surface is squeezed out. The contact state between the ringer roll and the steel strip depends on the shape of the ringer roll,
It is slightly different depending on the deterioration state and the shape of the steel strip. Then, it is considered that the delicate non-uniform state of the water film on the surface has a great effect on the subsequent formation of zinc phosphate crystals.
【０００９】従って、連続ラインの場合には、鋼帯表面
の水膜の状態が不均一な条件でりん酸亜鉛処理が施され
ることが避けられず、短時間処理の場合には、りん酸亜
鉛処理の初期にめっき層のエッチング反応が十分に生起
可能な処理液が必要となる。発明者等の検討結果では、
上記のりん酸塩処理剤処理液中に、エッチング剤として
フッ化物イオンを６０〜２００ｐｐｍの濃度で添加する
ことにより色調むらが解消可能なことが判明した。な
お、実験室的な検討では、この色調むらを再現すること
が不可能であり、上述した水膜の不均一性は極めて小さ
いものである。Therefore, in the case of a continuous line, it is inevitable that the zinc phosphate treatment is performed under the condition that the state of the water film on the surface of the steel strip is not uniform. At the beginning of the zinc treatment, a treatment liquid capable of sufficiently causing an etching reaction of the plating layer is required. According to the study results of the inventors,
It has been found that color tone unevenness can be eliminated by adding a fluoride ion as an etching agent at a concentration of 60 to 200 ppm to the above-mentioned phosphating agent treating solution. In the laboratory study, it is impossible to reproduce the color tone unevenness, and the above-mentioned nonuniformity of the water film is extremely small.
【００１０】亜鉛系めっき鋼板を脱脂して、水洗した後
に、Ｔｉ水酸化物粒子含有弱アルカリ表面調整剤処理液
で処理して、Ｎｉイオン含有りん酸亜鉛処理剤処理液を
スプレーすることにより皮膜付着量が２ｇ／ｍ2以上の
りん酸亜鉛皮膜を形成し、鋼板の色調を明度指数Ｌ値で
４５〜６０にするために、前記表面調整剤処理液のＴｉ
水酸化物粒子濃度を３０〜１００ｐｐｍとし、かつ、前
記りん酸亜鉛処理材処理液の全酸度を、処理液１０ｍｌ
をフェノールフタレインを指示薬として中和するのに要
する１／１０ＮのＮａＯＨ水溶液滴定量が４０〜８０ｍ
ｌ、Ｎｉイオン濃度を３．５〜７．０ｇ／ｌ、温度を６
５℃以上にする黒色化亜鉛系めっき鋼板の製造工程にお
いて、Ｎｉイオン含有りん酸亜鉛処理剤処理液中のフッ
化物イオン濃度を６０〜２００ｐｐｍにすると、鋼帯表
面が短時間で均一にエッチングされて、均一で緻密なり
ん酸亜鉛皮膜が形成され、色調が均一な黒色化亜鉛系め
っき鋼板を得ることができる。なお、ここでいうフッ化
物イオン濃度とは遊離イオン濃度を指す。[0010] The zinc-coated steel sheet is degreased, washed with water, treated with a treatment solution of a weak alkali surface conditioner containing Ti hydroxide particles, and sprayed with a treatment solution of a zinc phosphate treatment agent containing Ni ions. In order to form a zinc phosphate film having an adhesion amount of 2 g / m 2 or more, and to adjust the color tone of the steel sheet to a lightness index L value of 45 to 60, the surface conditioning agent treatment liquid Ti
The hydroxide particle concentration is set to 30 to 100 ppm, and the total acidity of the zinc phosphate treatment material treatment liquid is adjusted to 10 ml of the treatment liquid.
The amount of 1 / 10N NaOH aqueous solution required to neutralize phenolphthalein as an indicator is 40 to 80 m.
l, Ni ion concentration 3.5-7.0 g / l, temperature 6
In the manufacturing process of the blackened zinc-based plated steel sheet at 5 ° C. or more, when the fluoride ion concentration in the treatment solution of the zinc phosphate treating agent containing Ni ions is set to 60 to 200 ppm, the steel strip surface is uniformly etched in a short time. As a result, a uniform and dense zinc phosphate film is formed, and a blackened zinc-based plated steel sheet having a uniform color tone can be obtained. Here, the fluoride ion concentration refers to a free ion concentration.
【００１１】フッ化物イオン濃度が６０ｐｐｍ未満であ
ると、フッ化物イオンによるりん酸亜鉛処理初期のめっ
き表面のエッチング効果が小さく、鋼帯の長手方向に筋
状の色調むらを発生しやすい。また、２００ｐｐｍを超
えると長手方向のすじ状の色調むらは発生しないが、エ
ッチング作用が大きすぎ、りん酸亜鉛結晶が粗大で不均
一となるため、明度指数Ｌ値が４５未満となり色調が黒
くなりすぎるとともに、鋼帯全体がざらざらした感じと
なり、意匠性が損なわれる。If the fluoride ion concentration is less than 60 ppm, the effect of etching the plating surface at the initial stage of the zinc phosphate treatment by the fluoride ions is small, and streaky color tone unevenness is likely to occur in the longitudinal direction of the steel strip. On the other hand, when the content exceeds 200 ppm, a stripe-like color tone unevenness in the longitudinal direction does not occur, but the etching action is too large, and the zinc phosphate crystal becomes coarse and non-uniform. While too long, the whole steel strip becomes rough and the design is impaired.
【００１２】[0012]
【実施例】板厚０．４ｍｍ、板幅１０００ｍｍの溶融Ｚ
ｎめっきステンレス鋼帯と板厚０．６ｍｍ、板幅９１４
ｍｍの溶融Ｚｎ−５％Ａｌ合金めっき鋼帯に、連続塗装
ラインの前処理設備で次の工程、処理条件でりん酸亜鉛
処理を施した。 （１）脱脂処理 液温６５℃のアルカリ系脱脂剤で２秒処理した。 （２）水洗処理 工業用水をスプレーした。 （３）表面調整処理 Ｔｉ水酸化物粒子含有弱アルカリ表面調整剤［日本パー
カライジング(株)製、商品名；ＰＬ−Ｚ］をＴｉ水酸化
物粒子濃度が３０〜１００ｐｐｍになるように水で希釈
して、常温で１０秒間処理した。 （４）りん酸亜鉛処理 Ｎｉイオン含有りん酸亜鉛処理剤［日本パーカライジン
グ(株)製、商品名；ＰＢ−３７Ｍ］を水でＮｉイオンが
３〜６ｇ／ｌ、１／１０のＮａＯＨ水溶液による滴定量
の全酸度が６０〜８０ｍｌになるように希釈するととも
に、フッ化物イオンを１０〜２５０ｐｐｍとなるように
添加し、液温７０℃でスプレー処理した。なお、液温が
７０℃と高温のため、連続ラインでは時間とともに蒸発
により液量が減少する。また、鋼帯表面に付着した処理
液が持ち出されて減少し、さらに反応によっても処理液
中の成分は減少していく。このため、連続ラインで量産
する場合は、水および適当な組成の補給液を連続的に補
給することにより、連続ラインでの操業中に全酸度が６
０〜８０ｍｌ、Ｎｉイオン濃度が４〜６ｇ／ｌかつフッ
化物イオン濃度が１０〜２５０ｐｐｍになるように管理
した。 （５）乾燥処理 １２０℃の温風で５秒間乾燥した。EXAMPLE Melt Z having a thickness of 0.4 mm and a width of 1000 mm
n-plated stainless steel strip, thickness 0.6mm, width 914
The hot-dip Zn-5% Al alloy-plated steel strip having a thickness of 5 mm was subjected to a zinc phosphate treatment in a pretreatment facility of a continuous coating line under the following process and treatment conditions. (1) Degreasing treatment Treated with an alkaline degreasing agent at a liquid temperature of 65 ° C for 2 seconds. (2) Rinsing treatment Industrial water was sprayed. (3) Surface conditioning treatment A weak alkali surface modifier containing Ti hydroxide particles [trade name: PL-Z, manufactured by Nippon Parkerizing Co., Ltd.] is diluted with water so that the concentration of Ti hydroxide particles becomes 30 to 100 ppm. Then, it was processed at normal temperature for 10 seconds. (4) Zinc Phosphate Treatment A zinc phosphate treatment agent containing Ni ions [trade name: PB-37M, manufactured by Nippon Parkerizing Co., Ltd.] is titrated with water with 3 to 6 g / l of Ni ions and 1/10 NaOH aqueous solution. The solution was diluted so that the total acidity was 60 to 80 ml, and fluoride ions were added so as to be 10 to 250 ppm, and spraying was performed at a liquid temperature of 70 ° C. In addition, since the liquid temperature is as high as 70 ° C., the amount of the liquid decreases in the continuous line due to evaporation with time. Further, the processing liquid attached to the steel strip surface is taken out and reduced, and the components in the processing liquid also decrease due to the reaction. For this reason, in the case of mass production on a continuous line, water and a replenisher having an appropriate composition are continuously replenished, so that the total acidity becomes 6 during operation on the continuous line.
0 to 80 ml, the Ni ion concentration was controlled to be 4 to 6 g / l, and the fluoride ion concentration was controlled to be 10 to 250 ppm. (5) Drying treatment Drying was performed with 120 ° C. warm air for 5 seconds.
【００１３】以上で得られた鋼帯の色調を、色差計(ミ
ノルタ製CR-300)により幅方向に２５ｍｍピッチで３６
〜４０点測定し、色調のばらつきを評価した結果を表１
に示す。幅方向の明度指数Ｌ値のばらつきΔＬが３未満
で、かつすじ状の色調むらを発生しない場合の評価を良
とし、表中に○で示した。また、明度指数Ｌ値のばらつ
きΔＬが３以上、またはすじ状の色調むらを発生した場
合の評価を不良とし、×で示した。The color tone of the steel strip obtained as described above was measured at a pitch of 25 mm in the width direction using a color difference meter (CR-300 manufactured by Minolta).
Table 1 shows the results of measuring up to 40 points and evaluating the variation in color tone.
Shown in When the variation ΔL of the lightness index L value in the width direction was less than 3, and no streak-like color tone unevenness was generated, the evaluation was “good”, and is indicated by “○” in the table. In addition, when the variation ΔL of the lightness index L value was 3 or more, or when streak-like color tone unevenness occurred, the evaluation was evaluated as poor and indicated by x.
【００１４】[0014]
【表１】 [Table 1]
【００１５】[0015]
【発明の効果】以上示した様に、本発明法によれば亜鉛
系めっき鋼板を短時間ですじ状の色調むらなく均一に黒
色化処理することが可能であり、意匠性および生産性が
大幅に向上する。As described above, according to the method of the present invention, it is possible to blacken a galvanized steel sheet uniformly in a short time without unevenness of the striped color tone, thereby greatly improving the design and productivity. To improve.
Claims (1)
鋼板を脱脂して、水洗した後、Ｔｉ水酸化物粒子含有弱
アルカリ表面調整剤処理液で処理して、Ｎｉイオン含有
りん酸亜鉛処理剤処理液をスプレーすることにより皮膜
付着量が２ｇ／ｍ2以上のりん酸亜鉛皮膜を形成し、鋼
板の色調を明度指数Ｌ値で４５〜６０にする黒色化亜鉛
系めっき鋼板の製造方法であって、前記りん酸亜鉛処理
剤処理液中のフッ化物イオン濃度を６０〜２００ｐｐｍ
にすることを特徴とする黒色化亜鉛系めっき鋼板の製造
方法。1. A zinc-plated steel sheet or a zinc-based alloy-plated steel sheet is degreased, washed with water, and then treated with a treatment solution of a weak alkali surface conditioner containing Ti hydroxide particles, and treated with a zinc phosphate treatment agent containing Ni ions. A method for producing a blackened zinc-based plated steel sheet, wherein a zinc phosphate film having a coating amount of 2 g / m 2 or more is formed by spraying a liquid to adjust the color tone of the steel sheet to a lightness index L value of 45 to 60. The fluoride ion concentration in the zinc phosphating agent treatment solution is 60 to 200 ppm.
A method for producing a blackened zinc-based plated steel sheet, characterized in that:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11113496A JP2000309881A (en) | 1999-04-21 | 1999-04-21 | Production of black color galvanized steel sheet excellent in hue stability |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11113496A JP2000309881A (en) | 1999-04-21 | 1999-04-21 | Production of black color galvanized steel sheet excellent in hue stability |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2000309881A true JP2000309881A (en) | 2000-11-07 |
Family
ID=14613798
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11113496A Pending JP2000309881A (en) | 1999-04-21 | 1999-04-21 | Production of black color galvanized steel sheet excellent in hue stability |
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| Country | Link |
|---|---|
| JP (1) | JP2000309881A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005126812A (en) * | 2003-10-01 | 2005-05-19 | Nisshin Steel Co Ltd | Galvanized steel sheet superior in corrosion resistance, coating applicability and adhesiveness |
| JP2007138267A (en) * | 2005-11-21 | 2007-06-07 | Om Kogyo Kk | Blackening treatment method for hot dip zinc plated steel product and blackened hot dip zinc plated steel product obtained by the same |
-
1999
- 1999-04-21 JP JP11113496A patent/JP2000309881A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005126812A (en) * | 2003-10-01 | 2005-05-19 | Nisshin Steel Co Ltd | Galvanized steel sheet superior in corrosion resistance, coating applicability and adhesiveness |
| JP2007138267A (en) * | 2005-11-21 | 2007-06-07 | Om Kogyo Kk | Blackening treatment method for hot dip zinc plated steel product and blackened hot dip zinc plated steel product obtained by the same |
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