JPH02101176A - Production of hot dip galvanized steel sheet having superior blackening resistance - Google Patents
Production of hot dip galvanized steel sheet having superior blackening resistanceInfo
- Publication number
- JPH02101176A JPH02101176A JP25094888A JP25094888A JPH02101176A JP H02101176 A JPH02101176 A JP H02101176A JP 25094888 A JP25094888 A JP 25094888A JP 25094888 A JP25094888 A JP 25094888A JP H02101176 A JPH02101176 A JP H02101176A
- Authority
- JP
- Japan
- Prior art keywords
- steel sheet
- dip galvanized
- hot dip
- galvanized steel
- ions
- 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.)
- Granted
Links
- 229910001335 Galvanized steel Inorganic materials 0.000 title claims abstract description 9
- 239000008397 galvanized steel Substances 0.000 title claims abstract description 9
- 238000004519 manufacturing process Methods 0.000 title claims description 9
- 150000002500 ions Chemical class 0.000 claims abstract description 14
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 8
- 239000010959 steel Substances 0.000 claims abstract description 8
- ZCDOYSPFYFSLEW-UHFFFAOYSA-N chromate(2-) Chemical compound [O-][Cr]([O-])(=O)=O ZCDOYSPFYFSLEW-UHFFFAOYSA-N 0.000 claims abstract description 7
- 229910052745 lead Inorganic materials 0.000 claims abstract description 3
- 238000007747 plating Methods 0.000 claims description 18
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 6
- 239000011701 zinc Substances 0.000 claims description 6
- 229910052725 zinc Inorganic materials 0.000 claims description 5
- 239000012535 impurity Substances 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- 230000003405 preventing effect Effects 0.000 abstract description 7
- 229910052759 nickel Inorganic materials 0.000 abstract description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 3
- 229910001297 Zn alloy Inorganic materials 0.000 abstract description 2
- 239000011248 coating agent Substances 0.000 abstract description 2
- 238000000576 coating method Methods 0.000 abstract description 2
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 abstract 2
- 150000003841 chloride salts Chemical class 0.000 abstract 1
- 238000004532 chromating Methods 0.000 abstract 1
- 150000001860 citric acid derivatives Chemical class 0.000 abstract 1
- 150000002823 nitrates Chemical class 0.000 abstract 1
- 150000003839 salts Chemical class 0.000 abstract 1
- 150000003467 sulfuric acid derivatives Chemical class 0.000 abstract 1
- 238000005260 corrosion Methods 0.000 description 6
- 230000007797 corrosion Effects 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 239000010410 layer Substances 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 238000007654 immersion Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000002344 surface layer Substances 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- 230000002378 acidificating effect Effects 0.000 description 2
- 238000011278 co-treatment Methods 0.000 description 2
- 239000012141 concentrate Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000000523 sample Substances 0.000 description 2
- 208000023514 Barrett esophagus Diseases 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- KRKNYBCHXYNGOX-UHFFFAOYSA-K Citrate Chemical compound [O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O KRKNYBCHXYNGOX-UHFFFAOYSA-K 0.000 description 1
- 229910002651 NO3 Inorganic materials 0.000 description 1
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- FMRLDPWIRHBCCC-UHFFFAOYSA-L Zinc carbonate Chemical compound [Zn+2].[O-]C([O-])=O FMRLDPWIRHBCCC-UHFFFAOYSA-L 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 238000010306 acid treatment Methods 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- KRVSOGSZCMJSLX-UHFFFAOYSA-L chromic acid Substances O[Cr](O)(=O)=O KRVSOGSZCMJSLX-UHFFFAOYSA-L 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 229910001429 cobalt ion Inorganic materials 0.000 description 1
- XLJKHNWPARRRJB-UHFFFAOYSA-N cobalt(2+) Chemical compound [Co+2] XLJKHNWPARRRJB-UHFFFAOYSA-N 0.000 description 1
- UBEWDCMIDFGDOO-UHFFFAOYSA-N cobalt(II,III) oxide Inorganic materials [O-2].[O-2].[O-2].[O-2].[Co+2].[Co+3].[Co+3] UBEWDCMIDFGDOO-UHFFFAOYSA-N 0.000 description 1
- 239000008139 complexing agent Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000006056 electrooxidation reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 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 description 1
- 238000005246 galvanizing Methods 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- LGQLOGILCSXPEA-UHFFFAOYSA-L nickel sulfate Chemical compound [Ni+2].[O-]S([O-])(=O)=O LGQLOGILCSXPEA-UHFFFAOYSA-L 0.000 description 1
- 229910000363 nickel(II) sulfate Inorganic materials 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 150000007524 organic acids Chemical class 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 229910000010 zinc carbonate Inorganic materials 0.000 description 1
- 235000004416 zinc carbonate Nutrition 0.000 description 1
- 239000011667 zinc carbonate Substances 0.000 description 1
- UGZADUVQMDAIAO-UHFFFAOYSA-L zinc hydroxide Chemical compound [OH-].[OH-].[Zn+2] UGZADUVQMDAIAO-UHFFFAOYSA-L 0.000 description 1
- 229940007718 zinc hydroxide Drugs 0.000 description 1
- 229910021511 zinc hydroxide Inorganic materials 0.000 description 1
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
- C23C22/78—Pretreatment of the material to be coated
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)
- Chemical Treatment Of Metals (AREA)
- Coating With Molten Metal (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
この発明は耐黒変性にすぐれた溶融亜鉛メッキ鋼板の製
造法に関するものである。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for manufacturing hot-dip galvanized steel sheets with excellent blackening resistance.
（従来技術）
今日、溶融亜鉛メッキ鋼板は需要増大・用途の多様化と
共に外観、加工性、化成処理性および耐食性においてよ
り一層の性能向上が要求されている。外観の向上に対し
てはメッキ後亜鉛層が凝固する前に霧状水滴又は亜鉛粉
をメッキ層表層に吹きつけ亜鉛結晶を細かくするいわゆ
るゼロスパンクル処理が行なわれている。又ゼロスパン
グル処理後更に外観および表面形状を良くするためにス
キンパス処理を行なう場合がある。しかしスキンパス処
理を行なった後に耐食性改善のためのクロム酸処理（ク
ロメート処理）を行なうと製造後比較的短時間の倉庫保
管中、又は輸送中メッキ表面が灰黒色に変色する（いわ
ゆる経時黒変）ｌ−ラブルが発生する事がたびたびある
。(Prior Art) Today, as demand for hot-dip galvanized steel sheets increases and their uses diversify, further improvements in performance are required in terms of appearance, workability, chemical conversion treatment properties, and corrosion resistance. In order to improve the appearance, so-called zero spankle treatment is carried out to finely form zinc crystals by spraying atomized water droplets or zinc powder onto the surface layer of the plating layer before the zinc layer solidifies after plating. Further, after the zero spangle treatment, a skin pass treatment may be performed to further improve the appearance and surface shape. However, if skin pass treatment is followed by chromate treatment to improve corrosion resistance, the plated surface will turn grayish-black during storage or transportation for a relatively short time after manufacture (so-called blackening over time). L-rubble often occurs.
この経時黒変は非スキンパス材でも長期保存した場合発
生する事が時々観察されているがセロスパングル処理を
したスキンパス材は非常に短期間で発生するところに特
徴がある。This blackening over time has sometimes been observed to occur even in non-Skinpass materials when stored for long periods of time, but Skinpass materials treated with cello spangles are unique in that they occur in a very short period of time.
経時黒変を防止する技術としては特開昭５９−１７７３
８ｉ号公報に記載されているものが知られている。As a technique for preventing blackening over time, Japanese Patent Application Laid-Open No. 59-1773
The one described in Publication No. 8i is known.
この技術は表面に亜鉛または亜鉛合金系の溶融メッキを
施した亜鉛系メッキ鋼板をＮｉイオンまたはＣｏイオン
あるいはその両者を溶合する溶液で処理することを特徴
とする耐黒変性に優れた溶融亜鉛系メッキ鋼板の製造法
にある。This technology is characterized by treating a zinc-plated steel sheet with zinc or zinc alloy hot-dip plating on its surface with a solution that dissolves Ni ions, Co ions, or both. It is in the manufacturing method of galvanized steel sheets.
（発明が解決しようとする課題）
本発明者等はさらに有効な経時黒変防止技術を確立する
ために検討した結果、Ｎｉイオン、Ｃｏイオンを含む溶
液で処理する際に最も適したメッキ浴成分を見出した。(Problems to be Solved by the Invention) As a result of studies to establish a more effective technique for preventing blackening over time, the present inventors found that the most suitable plating bath components for treatment with a solution containing Ni ions and Co ions. I found out.
メッキ浴中の元素について種々検討した結果ｐｂが経時
黒変に有害である事が判明した。しかしｐｂを無添加と
するとスパングル材の製造ができないため、スパングル
材の製造が可能であり、が゛つＮｉイオン、Ｃｏイオン
を含む溶液で処理すれば充分な経時黒変防止効果が得ら
れる添加元素を検討した結果、ｓｂが最適である事が判
明した。As a result of various studies on elements in the plating bath, it was found that PB is harmful to blackening over time. However, spangled materials cannot be manufactured without the addition of PB, so it is possible to manufacture spangled materials, and if treated with a solution containing Ni ions and Co ions, a sufficient effect of preventing blackening over time can be obtained. After examining the elements, it was found that sb was the most suitable.
本発明と先行技術である特開昭５９−１７７３８１号公
報との大きな相違は次の通りである。The major differences between the present invention and the prior art, JP-A-59-177381, are as follows.
先行技術は経時黒変のメカニズム（後述）である形成さ
れた局部電池の効果をＣｏ、又はＮｉの金属又は酸化物
により緩和させようとするものであるのに対し、本発明
は局部電池の形成要因であるメッキ層金属の濃化を抑制
しようとするものである。While the prior art attempts to alleviate the effect of the formed local battery, which is the mechanism of blackening over time (described later), using a metal or oxide of Co or Ni, the present invention This is intended to suppress the concentration of metal in the plating layer, which is a contributing factor.
（課題を解決するための手段）
しかして、本発明は鋼板表面に溶融亜鉛メッキを施し、
更にその表面にクロメート処理を行う製造工程に於いて
、Ａｌ ： ０．１０〜０．３０％、Ｐｂ ： ０．１
％以下、Ｓｂ ： Ｏ，１０〜０．３０％で残部亜鉛及
び不可避的不純物よりなる溶融メッキ浴でメッキした後
、必要に応じて伸び率０．３〜１゜５％のスキンパス処
理を施して、その後ＮｉイオンまたはＣｏイオンあるい
はその両者を混合する溶液で処理してクロメート処理す
ることを特徴とする耐黒変性にすぐれた溶融亜鉛メッキ
鋼板の製造方法である。(Means for solving the problem) Therefore, the present invention applies hot-dip galvanizing to the surface of a steel plate,
Furthermore, in the manufacturing process in which the surface is subjected to chromate treatment, Al: 0.10 to 0.30%, Pb: 0.1
% or less, Sb: O, after plating in a hot-dip plating bath consisting of 10 to 0.30% with the balance zinc and unavoidable impurities, if necessary, skin pass treatment with an elongation rate of 0.3 to 1.5% is performed. This is a method for producing a hot-dip galvanized steel sheet with excellent blackening resistance, which is characterized in that the steel sheet is then treated with a solution containing Ni ions, Cobalt ions, or a mixture of both for chromate treatment.
（作 用）
本発明の処理条件について述べるとＰｂ濃度は０．０１
％以下であれば充分な経時黒変防止効果が得られ、この
数値は低い程よい。ｓｂ濃度は０．１０％未満では美麗
なスパングルが形成されない。又０．３０＝３−
％超ではスパングル形、成がかわらないばかりか充分な
経時黒変防止効果が得られない。又Ａ１濃度はメッキ密
着性の観点から決定され０．１０％未満ではメッキ密着
性が不充分であり０．３０％超では改善効果はかわらな
い。(Function) Regarding the processing conditions of the present invention, the Pb concentration is 0.01
% or less, a sufficient effect of preventing blackening over time can be obtained, and the lower this value is, the better. If the sb concentration is less than 0.10%, beautiful spangles will not be formed. Moreover, if it exceeds 0.30=3-%, not only the spangle shape and structure will not change, but also a sufficient effect of preventing blackening over time will not be obtained. Further, the A1 concentration is determined from the viewpoint of plating adhesion, and if it is less than 0.10%, the plating adhesion is insufficient, and if it exceeds 0.30%, the improvement effect will not change.
Ｎｉイオン、Ｃｏイオンを含む処理液についてはＮ１、
Ｃｏの硫酸塩、塩化塩、硝酸塩、クエン酸塩などを溶解
した酸性浴を使用してもよくまたアンモニア、有機酸な
どの錯化剤を含むアルカリ性浴を使用してもよい。処理
液中のイオン濃度、温度、ｐＨは特に限定されたもので
はなく巾広い適正範囲が存在する。For processing liquids containing Ni ions and Co ions, N1,
An acidic bath containing dissolved Co sulfate, chloride, nitrate, citrate, etc. may be used, or an alkaline bath containing a complexing agent such as ammonia, organic acid, etc. may be used. The ion concentration, temperature, and pH in the treatment liquid are not particularly limited and have a wide appropriate range.
金属イオン濃度については１〜４０ｇＩＱの範囲が好ま
しい。処理温度については３０〜６０℃の範囲が好まし
い。ｐＨについては酸性浴の場合ｐＨ１〜４、アルカリ
性浴の場合ＰＨ１，１〜１３６５の範囲が適当であり、
このｐＨ範囲をはずれるとメッキ表面にＮｉまたはＣｏ
付着量が付きすぎるかまたは逆に付きにくい現象が起る
。本発明の場合ＮｉまたはＣｏ付着量は０．２〜１５■
／イの範囲が好ましい。浸漬またはスプレー処理時間は
付着量が好ましい範囲である０、２〜１５■／ｍ にな
る様に前述した濃度、温示、ｐＨの条件を選択すればよ
い。The metal ion concentration is preferably in the range of 1 to 40 gIQ. The treatment temperature is preferably in the range of 30 to 60°C. Regarding pH, a range of pH 1 to 4 is appropriate for acidic baths, and a range of PH 1.1 to 1365 for alkaline baths.
If the pH is outside this range, Ni or Co will be added to the plating surface.
A phenomenon occurs in which the amount of adhesion is too high or, conversely, it is difficult to adhere. In the case of the present invention, the amount of Ni or Co deposited is 0.2 to 15■
The range of /a is preferable. The immersion or spray treatment time may be determined by selecting the above-mentioned concentration, temperature, and pH conditions so that the coating amount is within the preferable range of 0.2 to 15 .mu./m.sup.2.
スキンパスの伸率については０．３％未満では美麗な表
面外観が得られないばかりか降伏点伸びが残存し引続い
て行なわれるレベラー処理においていわゆる″レベラー
ブレーク″が発生する。一方１．５％超の伸率では材質
が硬化し柔軟な材質特性が得られない。If the elongation rate of the skin pass is less than 0.3%, not only will a beautiful surface appearance not be obtained, but elongation at the yield point will remain and so-called "leveler break" will occur in the subsequent leveler treatment. On the other hand, if the elongation rate exceeds 1.5%, the material will harden and flexible material properties will not be obtained.
本発明による経時黒変防止メカニズムは次の通りと推定
される。ｐｂを含有したメッキ浴を使用した場合ｐｂは
メッキ後表層に濃化し局部電池を形成しやすく水分を吸
収しやすいクロメート層を介在した腐食環境下で電気化
学的腐食を進行させやすい。Ｚｎ層の腐食がおこると微
細な凹凸が生じその上に腐食生成物である水酸化亜鉛や
炭酸亜鉛の薄膜層が存在するため光干渉で黒変現象を起
す。この場合Ｎｉ又はＣｏが金属または酸化物の形で析
出しても局部電池に基く腐食の進行を抑制するには不充
分であり経時黒変が起るものと考えられる。The mechanism of preventing blackening over time according to the present invention is presumed to be as follows. When a plating bath containing PB is used, PB tends to concentrate on the surface layer after plating and form local batteries, and electrochemical corrosion tends to progress in a corrosive environment with a chromate layer that easily absorbs water. When corrosion of the Zn layer occurs, minute irregularities are created, and a thin film layer of zinc hydroxide or zinc carbonate, which is a corrosion product, is present on the surface, causing a blackening phenomenon due to optical interference. In this case, even if Ni or Co is precipitated in the form of a metal or oxide, it is thought to be insufficient to suppress the progress of corrosion due to local batteries, and blackening occurs over time.
しかし、メッキ浴中元素のｐｂ添加量を減少させかわり
にｓｂを添加した場合ｓｂはメッキ後表層への濃化がｐ
ｂに比べ少ないためＮ１又はＣｏの金属または酸化物が
析出する事による腐食の進行抑止が有効に働くものと考
えられる。However, when the amount of PB added in the plating bath is reduced and sb is added instead, sb concentrates on the surface layer after plating.
Since the amount is smaller than that of b, it is considered that the precipitation of N1 or Co metals or oxides effectively inhibits the progress of corrosion.
（実施例）
第１表メッキ浴成分
供試材
サイズ ０．５ Ｘ １００ Ｘ ２００ｍｍスキンパ
ス伸率 １．０％
前処理
Ｎ］処理
ＮｉＳＯ４・６Ｈ，，０５０ｇ／ＱｐＨ２温度４０°Ｃ
浸漬時間２秒
Ｃｏ処理 Ｃｏ３Ｏ４・７１１□０ ５０ｇ／Ｑ
、ｐＨ２温度４０℃浸漬時間２秒
Ｎｉ＋Ｃｏ処理 ＮｉＳＯ４・６１（２０３０ｇ＃ｌ
（、ｏＳＯ４・７Ｈ□０ ３０ｇ／Ｑ洗浄
クロム酸処理
黒変促進テスト
試料サイズ
雰 囲 気
放置時間
判定基準
判 定
◎
△
×
浄水
ｒｙｊ
温度４０℃
浸漬時間２秒
３０ｇ／Ｑ
５０°Ｃ
浸漬時間３秒
１００Ｘ］００ｍｍ
７０６Ｃ９８％Ｒ１１
５日間
黒変状態
黒変ぜず
極く薄く灰色化する
黒変３０％未満
黒変３０％以」―
第２表試験結果
本発明のメッキ浴によりメッキを行なったものはいずれ
も経時黒変防止能力に優れている事を示す。(Example) Table 1 Plating bath components Sample material size 0.5 x 100 x 200mm Skin pass elongation 1.0% Pretreatment N] Treatment NiSO4.6H, 050g/Q pH2 Temperature 40°C
Immersion time 2 seconds Co treatment Co3O4・711□0 50g/Q
, pH2 temperature 40℃ immersion time 2 seconds Ni+Co treatment NiSO4・61 (2030g#l
(, oSO4・7H□0 30g/Q Cleaning Chromic Acid Treatment Blackening Acceleration Test Sample Size Atmosphere Standing Time Judgment Criteria Judgment ◎ △ seconds 100 All of these exhibit excellent ability to prevent blackening over time.
（発明の効果）(Effect of the invention)
Claims (1)
メート処理を行う製造工程に於いて、Ａｌ：０．１０〜
０．３０％、Ｐｂ：０．１％以下、Ｓｂ：０．１０〜０
．３０％で残部亜鉛及び不可避的不純物よりなる溶融メ
ッキ浴でメッキした後、必要に応じて伸び率０．３〜１
．５％のスキンパス処理を施して、その後Ｎｉイオンま
たはＣｏイオンあるいはその両者を混合する溶液で処理
してクロメート処理することを特徴とする耐黒変性にす
ぐれた溶融亜鉛メッキ鋼板の製造方法。In the manufacturing process where the surface of the steel sheet is hot-dip galvanized and further chromate treated, Al: 0.10~
0.30%, Pb: 0.1% or less, Sb: 0.10-0
．． After plating with a hot-dip plating bath consisting of 30% zinc and unavoidable impurities, the elongation rate is 0.3 to 1 as necessary.
．． A method for producing a hot-dip galvanized steel sheet with excellent blackening resistance, characterized by subjecting it to a 5% skin pass treatment, and then chromate treatment by treating it with a solution containing Ni ions, Co ions, or a mixture of both.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25094888A JPH02101176A (en) | 1988-10-06 | 1988-10-06 | Production of hot dip galvanized steel sheet having superior blackening resistance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25094888A JPH02101176A (en) | 1988-10-06 | 1988-10-06 | Production of hot dip galvanized steel sheet having superior blackening resistance |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02101176A true JPH02101176A (en) | 1990-04-12 |
| JPH0581673B2 JPH0581673B2 (en) | 1993-11-15 |
Family
ID=17215388
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP25094888A Granted JPH02101176A (en) | 1988-10-06 | 1988-10-06 | Production of hot dip galvanized steel sheet having superior blackening resistance |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02101176A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005052209A1 (en) * | 2003-11-26 | 2005-06-09 | Bluescope Steel Limited | Coated steel strip |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59177381A (en) * | 1983-03-26 | 1984-10-08 | Nippon Steel Corp | Production of galvanized steel sheet having resistance to blackening |
| JPS6055590A (en) * | 1983-09-05 | 1985-03-30 | Fujitsu Ltd | Selecting system of printed board unit |
| JPS61253378A (en) * | 1985-05-02 | 1986-11-11 | Kawasaki Steel Corp | Hot dip galvanized steel sheet having superior resistance to blackening, corrosion and scratch and its manufacture |
-
1988
- 1988-10-06 JP JP25094888A patent/JPH02101176A/en active Granted
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59177381A (en) * | 1983-03-26 | 1984-10-08 | Nippon Steel Corp | Production of galvanized steel sheet having resistance to blackening |
| JPS6055590A (en) * | 1983-09-05 | 1985-03-30 | Fujitsu Ltd | Selecting system of printed board unit |
| JPS61253378A (en) * | 1985-05-02 | 1986-11-11 | Kawasaki Steel Corp | Hot dip galvanized steel sheet having superior resistance to blackening, corrosion and scratch and its manufacture |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005052209A1 (en) * | 2003-11-26 | 2005-06-09 | Bluescope Steel Limited | Coated steel strip |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0581673B2 (en) | 1993-11-15 |
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