JPH03247797A - Electrogalvanized steel sheet excellent in corrosion resistance and press formability - Google Patents
Electrogalvanized steel sheet excellent in corrosion resistance and press formabilityInfo
- Publication number
- JPH03247797A JPH03247797A JP4369790A JP4369790A JPH03247797A JP H03247797 A JPH03247797 A JP H03247797A JP 4369790 A JP4369790 A JP 4369790A JP 4369790 A JP4369790 A JP 4369790A JP H03247797 A JPH03247797 A JP H03247797A
- Authority
- JP
- Japan
- Prior art keywords
- zinc
- steel sheet
- corrosion resistance
- silica particles
- press formability
- 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
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 37
- 239000010959 steel Substances 0.000 title claims abstract description 37
- 230000007797 corrosion Effects 0.000 title claims abstract description 19
- 238000005260 corrosion Methods 0.000 title claims abstract description 19
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 39
- UGZADUVQMDAIAO-UHFFFAOYSA-L zinc hydroxide Chemical compound [OH-].[OH-].[Zn+2] UGZADUVQMDAIAO-UHFFFAOYSA-L 0.000 claims abstract description 15
- 229910021511 zinc hydroxide Inorganic materials 0.000 claims abstract description 15
- 229940007718 zinc hydroxide Drugs 0.000 claims abstract description 15
- 238000001556 precipitation Methods 0.000 claims abstract description 8
- 238000007747 plating Methods 0.000 claims description 34
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 22
- 229910052725 zinc Inorganic materials 0.000 claims description 22
- 239000011701 zinc Substances 0.000 claims description 22
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims 1
- 239000011787 zinc oxide Substances 0.000 claims 1
- 239000000377 silicon dioxide Substances 0.000 abstract description 6
- 238000005246 galvanizing Methods 0.000 abstract 1
- 229910001297 Zn alloy Inorganic materials 0.000 description 7
- 238000009713 electroplating Methods 0.000 description 7
- 229910002651 NO3 Inorganic materials 0.000 description 6
- KFZAUHNPPZCSCR-UHFFFAOYSA-N iron zinc Chemical compound [Fe].[Zn] KFZAUHNPPZCSCR-UHFFFAOYSA-N 0.000 description 6
- 230000002378 acidificating effect Effects 0.000 description 5
- -1 nitrate ions Chemical class 0.000 description 5
- 238000000227 grinding Methods 0.000 description 4
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 229910001335 Galvanized steel Inorganic materials 0.000 description 2
- 239000008119 colloidal silica Substances 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000008397 galvanized steel Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- FGIUAXJPYTZDNR-UHFFFAOYSA-N potassium nitrate Chemical compound [K+].[O-][N+]([O-])=O FGIUAXJPYTZDNR-UHFFFAOYSA-N 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 238000007790 scraping Methods 0.000 description 2
- VWDWKYIASSYTQR-UHFFFAOYSA-N sodium nitrate Chemical compound [Na+].[O-][N+]([O-])=O VWDWKYIASSYTQR-UHFFFAOYSA-N 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 1
- VMHLLURERBWHNL-UHFFFAOYSA-M Sodium acetate Chemical compound [Na+].CC([O-])=O VMHLLURERBWHNL-UHFFFAOYSA-M 0.000 description 1
- PTFCDOFLOPIGGS-UHFFFAOYSA-N Zinc dication Chemical compound [Zn+2] PTFCDOFLOPIGGS-UHFFFAOYSA-N 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910052734 helium Inorganic materials 0.000 description 1
- 239000001307 helium Substances 0.000 description 1
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- HPCCWDVOHHFCKM-UHFFFAOYSA-M lithium;hydrogen sulfate Chemical compound [Li+].OS([O-])(=O)=O HPCCWDVOHHFCKM-UHFFFAOYSA-M 0.000 description 1
- 229910000000 metal hydroxide Inorganic materials 0.000 description 1
- 150000004692 metal hydroxides Chemical class 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 235000010333 potassium nitrate Nutrition 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 235000017281 sodium acetate Nutrition 0.000 description 1
- 239000001632 sodium acetate Substances 0.000 description 1
- 235000010344 sodium nitrate Nutrition 0.000 description 1
- 229910052938 sodium sulfate Inorganic materials 0.000 description 1
- 235000011152 sodium sulphate Nutrition 0.000 description 1
Landscapes
- Electroplating Methods And Accessories (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明は、耐食性およびプレス成形性に優れた亜鉛系
電気メツキ鋼板に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a zinc-based electroplated steel sheet having excellent corrosion resistance and press formability.
近時、自動車メーカーなどから、厳しい腐食環境下にお
いても、優れた耐食性を有し、製品の耐久性を高めるこ
とができるめっき鋼板が強く要求されている。In recent years, there has been a strong demand from automobile manufacturers and others for plated steel sheets that have excellent corrosion resistance and can enhance the durability of products even in severe corrosive environments.
亜鉛めっき鋼板は、自動車用鋼板として従来から広く使
用されている。亜鉛めっき鋼板において、上述した要求
に応え、その耐食性を高める手段について従来から種々
研究がなされており１例えば、めっき層を厚くすること
が行なわれている。Galvanized steel sheets have been widely used as steel sheets for automobiles. In order to meet the above-mentioned demands, various studies have been carried out in the past on ways to improve the corrosion resistance of galvanized steel sheets. For example, increasing the thickness of the plating layer has been carried out.
自動車用鋼板等の場合には、プレスによって厳しい成形
加工が施されるため、めっき層が厚いと、成形加工時に
、めっき層がプレスダイによって削り落され、耐食性が
劣化する問題が生ずる。In the case of steel sheets for automobiles, etc., severe forming processing is performed by pressing, so if the plating layer is thick, the plating layer will be scraped off by the press die during forming processing, causing a problem of deterioration of corrosion resistance.
このような問題を解決する手段として、めっき層の硬質
化が研究されており、例えば、鋼板の表面上に、硬質の
鉄−亜鉛合金めっき層が形成された、鉄−亜鉛合金めっ
き鋼板が知られている。As a means to solve these problems, research is being conducted on making the plating layer harder. For example, iron-zinc alloy plated steel sheets, in which a hard iron-zinc alloy plating layer is formed on the surface of the steel sheet, are known. It is being
鉄−亜鉛合金めっき鋼板は、めっき層が硬く、耐食性に
優れ、製造コストが安い等、多くの利点を有している。Iron-zinc alloy plated steel sheets have many advantages, such as a hard plating layer, excellent corrosion resistance, and low manufacturing cost.
しかしながら、鉄−亜鉛合金めっき層は極度に脆いため
に、プレスによって厳しい成形加工が施され、鉄−亜鉛
合金めっき層が変形すると、めっき層に粉状の剥離即ち
パウダリングが発生し、耐食性が劣化する問題が生ずる
。However, since the iron-zinc alloy plating layer is extremely brittle, it is subjected to severe forming processing using a press, and when the iron-zinc alloy plating layer is deformed, powder-like peeling, that is, powdering, occurs in the plating layer, reducing its corrosion resistance. The problem of deterioration arises.
一方、亜鉛めっき層中にシリカ粒子を均一に分散させる
ことによって耐食性を改善した、亜鉛−シリカ複合電気
めっき鋼板が知られている。しかしながら、このように
、シリカ粒子が均一に分散した亜鉛系めっき層のプレス
成形性は、必ずしも良好であるとは云えず、プレスによ
る厳しい成形加工時におけるパウダリングの発生を、適
確に防止することはできない。On the other hand, a zinc-silica composite electroplated steel sheet is known, which has improved corrosion resistance by uniformly dispersing silica particles in the galvanized layer. However, the press formability of a zinc-based plating layer in which silica particles are uniformly dispersed cannot necessarily be said to be good, and it is difficult to properly prevent powdering from occurring during severe press forming. It is not possible.
従って、この発明の目的は、プレスによって厳しい成形
加工が施されても、めっき層に削り落ちやパウダリング
が生ずることのない、耐食性およびプレス成形性に優れ
た亜鉛系電気めっき鋼板を提供することにある。Therefore, an object of the present invention is to provide a zinc-based electroplated steel sheet with excellent corrosion resistance and press formability, which does not cause scraping or powdering in the plating layer even when subjected to severe forming processing using a press. It is in.
本発明者等は、上述した問題を解決し、耐食性およびプ
レス成形性に優れた亜鉛系電気めっき鋼板を開発すべく
、鋭意研究を重ねた。その結果、本発明者等は、次の知
見を得た。水酸化亜鉛が析出する亜鉛めっき層は、従来
、鋼板との密着性およびプレス成形性が悪いので実用化
されていなかったが、本発明者等の研究によって、水酸
化亜鉛には、プレス成形性が良好になる析出範囲のある
ことを見出だした。そして、プレス成形性が良好になる
ように水酸化亜鉛を析出させるため↓３は、シリカ粒子
をめっき浴中に添加し、その表面が水酸化亜鉛によって
被覆されたシリカ粒子を析出させればよいことがわかっ
た。The present inventors have conducted extensive research in order to solve the above-mentioned problems and develop a zinc-based electroplated steel sheet with excellent corrosion resistance and press formability. As a result, the present inventors obtained the following knowledge. Conventionally, the galvanized layer on which zinc hydroxide is precipitated has not been put to practical use due to poor adhesion with steel sheets and poor press formability, but research by the present inventors has revealed that zinc hydroxide has good press formability. It has been found that there is a precipitation range in which the properties are good. In order to precipitate zinc hydroxide so as to improve press formability, ↓3 is achieved by adding silica particles to the plating bath and precipitating silica particles whose surfaces are coated with zinc hydroxide. I understand.
この発明は、上記知見に基いてなされたものであって、
シリカ粒子が均一に分散して析出している亜鉛系めっき
層を、その少なくとも１つの表面上に有する亜鉛系電気
めっき鋼板において、前記シリカ粒子の各々の表面が水
酸化亜鉛によって被覆されていることに特徴を有するも
のである。This invention was made based on the above findings, and
A zinc-based electroplated steel sheet having a zinc-based plating layer on at least one surface thereof, in which silica particles are uniformly dispersed and precipitated, wherein each surface of the silica particles is coated with zinc hydroxide. It has the following characteristics.
図面は、この発明の亜鉛系電気めっき鋼板の一実施態様
を示す模式図である。図面に示すように、鋼板１の表面
上に形成された亜鉛系めっき層２中には、各々の表面が
水酸化亜鉛３によって被覆されたシリカ粒子４が均一に
分散して析出している。The drawing is a schematic diagram showing one embodiment of the zinc-based electroplated steel sheet of the present invention. As shown in the drawing, silica particles 4, each surface of which is coated with zinc hydroxide 3, are uniformly dispersed and precipitated in a zinc-based plating layer 2 formed on the surface of a steel sheet 1.
従って、プレス成形時において、めっき層２に、シリカ
粒子４間において微細なりラックが形成されるので、め
っき層２の変形が容易になり、プレス滑り込み性が良好
になる。従って、プレスによって厳しい成形加工が施さ
れても、めっき層に削り落ちやパウダリングが生ずるこ
とはない。Therefore, during press molding, fine racks are formed between the silica particles 4 in the plating layer 2, which facilitates deformation of the plating layer 2 and improves press sliding properties. Therefore, even if severe molding is performed using a press, the plating layer will not be scraped off or powdered.
このような、各々の表面が水酸化亜鉛によって被覆され
たシリカ粒子の析出率は、０．１〜５ｗｔ。The precipitation rate of such silica particles whose surfaces are coated with zinc hydroxide is 0.1 to 5 wt.
％の範囲内に限定することが好ましい。前記シリカ粒子
の析出率が０．１ｗｔ、％未満では、プレス成形性を向
上させる効果がない。一方、前記シリカ粒子の析出率が
５ｗｔ、％を超えると、逆にプレス成形性が劣化する。It is preferable to limit it within the range of %. If the precipitation rate of the silica particles is less than 0.1 wt.%, there is no effect of improving press formability. On the other hand, when the precipitation rate of the silica particles exceeds 5 wt.%, press formability deteriorates.
次に、この発明の亜鉛系電気めっき鋼板の製造方法を説
明する。Next, a method for manufacturing a zinc-based electroplated steel sheet according to the present invention will be explained.
基本浴として従来の亜鉛系酸性電気めっき浴を使用し、
この基本浴に、シリカ粒子および硝酸イオンを各々所定
量添加する。このように、シリカ粒子および硝酸イオン
を含有する亜鉛系酸性電気めっき浴を使用し、鋼板を陰
極として電気めっきを行なうと、陰極の表面において硝
酸イオンが還元され、陰極界面におけるめっき浴のｐＨ
が上昇する。このｐＨの上昇により、亜鉛イオンは水酸
化亜鉛となってシリカ粒子の表面に吸着し、水酸化亜鉛
は、シリカ粒子を取り囲む形で、めっき層内に取り込ま
れる。かくして、各々の表面が水酸化亜鉛によって被覆
されたシリカ粒子が均一に分散して析出している亜鉛系
めっき層を、その少なくとも１つの表面上に有する亜鉛
系電気めっき鋼板が製造される。Using a conventional zinc-based acidic electroplating bath as the basic bath,
Predetermined amounts of silica particles and nitrate ions are added to this basic bath. In this way, when electroplating is performed using a zinc-based acidic electroplating bath containing silica particles and nitrate ions and a steel plate is used as a cathode, the nitrate ions are reduced on the surface of the cathode, and the pH of the plating bath at the cathode interface increases.
rises. Due to this increase in pH, zinc ions become zinc hydroxide and are adsorbed on the surface of the silica particles, and the zinc hydroxide is incorporated into the plating layer in a form surrounding the silica particles. In this way, a zinc-based electroplated steel sheet is produced which has a zinc-based plating layer on at least one surface thereof, each surface of which is coated with zinc hydroxide and in which silica particles are uniformly dispersed and precipitated.
シリカ粒子は、めっき浴に添加する上での取り扱い易さ
から、コロイダルシリカを使用することが好ましい。メ
ツキ浴中のシリカ粒子の含有量は、１〜２ Ｑ Ｑ ｇ
ＩＱの範囲内が好ましい。 シリカ粒子の含有量がｉｇ
／Ｑ未満では、 シリカの析出効率が低下して、めっき
層に高い耐食性が得られない。一方、２００ ｇ／＋１
を超えると、電解効率が低下する。As the silica particles, it is preferable to use colloidal silica because it is easy to handle when added to a plating bath. The content of silica particles in the plating bath is 1 to 2 Q Q g
Preferably within the IQ range. The content of silica particles is ig
If it is less than /Q, the precipitation efficiency of silica decreases, and high corrosion resistance cannot be obtained in the plating layer. On the other hand, 200 g/+1
If it exceeds , electrolytic efficiency decreases.
硝酸イオンとしては、ＮａＮＯ３，ＫＮＯ３等を使用す
ることができる。めっき浴中の硝酸イオンの含有量は、
０．１〜２０ ｇＩＱの範囲内が好ましい。硝酸イオン
の含有量が０．１ｇ／Ｑ未満では、 シリカの析出効率
が低下して、めっき層に高い耐食性が得られない。一方
、 ２０ｇＩＱを超えると金属の水酸化物が過剰に生成
して、めっき被膜が脆くなる。As the nitrate ion, NaNO3, KNO3, etc. can be used. The content of nitrate ions in the plating bath is
It is preferably within the range of 0.1 to 20 gIQ. If the content of nitrate ions is less than 0.1 g/Q, the silica precipitation efficiency decreases and high corrosion resistance cannot be obtained in the plating layer. On the other hand, if it exceeds 20 gIQ, metal hydroxides will be excessively produced and the plating film will become brittle.
次に、この発明を、実施例により、本発明の範囲外の比
較例と対比しながら説明する。Next, the present invention will be explained using examples and in comparison with comparative examples outside the scope of the present invention.
下記からなる酸性亜鉛電気めっき浴
硫酸亜釦 ：３００ｇ／ｆｌ
硫酸す１−リウム： ３０ｇＩＱ
酢酸ナトリウム： ］、５ｇ／ｆ１
を基本浴として使用し、この基本浴に、コロイダルシリ
カを、シリカ粒子の含有量が１〜２００ｇ／Ｑの範囲内
となるように、そして、硝酸す１ヘリウムｋ、硝酸イオ
ンの含有量が０．１〜２０ｇＩＱの範囲内となるように
それぞれ添加して、酸性亜鉛電気めっき浴を調製した。An acidic zinc electroplating bath consisting of the following is used as a basic bath: sodium sulfate: 300 g/fl, monolithium sulfate: 30 g/fl, sodium acetate: ], 5 g/f1, and this basic bath contains colloidal silica and silica particles. Acidic zinc electroplating is carried out by adding so that the amount is within the range of 1 to 200 g/Q, and the content of nitrate 1 helium K and nitrate ion is within the range of 0.1 to 20 g IQ. A bath was prepared.
このようにして調製された酸性亜鉛電気めっき浴を使用
し、鋼板を陰極として、電気めっきにより、鋼板の表面
−ヒに、各々の表面が水酸化亜鉛によって被覆されたシ
リカ粒子が均一に分散して析出している亜鉛めっき層を
形成し、かくして、本発明電気めっき鋼板Ｎａ １〜５
を調製した。Using the acidic zinc electroplating bath prepared in this way and using the steel plate as a cathode, silica particles whose respective surfaces are coated with zinc hydroxide are uniformly dispersed on the surface of the steel plate by electroplating. Thus, the electroplated steel sheet of the present invention has Na 1 to 5
was prepared.
比較のために、鋼板の表面上に、従来の、鉄亜鉛合金電
気めっき層、亜鉛めっき層、および、シリカ粒子が分散
した亜鉛合金電気めっき層が形成されている比較用電気
めっき鋼板Ｎｏ、 １〜４を調製した。For comparison, comparative electroplated steel sheet No. 1 was prepared, in which a conventional iron-zinc alloy electroplated layer, a galvanized layer, and a zinc alloy electroplated layer in which silica particles were dispersed were formed on the surface of the steel sheet. ~4 was prepared.
これらの本発明電気めっき鋼板Ｎｏ１〜５．および、比
較用電気めっき鋼板Ｎｃ １〜４の、めっき層の成分組
成およびめっき層の厚さ、および、これらの耐食性およ
びプレス成形性を、同じく第１表に示す。These electroplated steel sheets No. 1 to 5 of the present invention. Table 1 also shows the composition of the plating layer, the thickness of the plating layer, and the corrosion resistance and press formability of the electroplated steel sheets Nc 1 to 4 for comparison.
なお、耐食性は、連続１，０００時間の塩水噴霧試験に
おける、赤錆発生までの塩水噴霧時間によって示し、そ
して、プレス成形性は、ドロービード試験における、試
験後のめっき剥離量によって示した。Corrosion resistance was indicated by the salt spray time until red rust appeared in a 1,000-hour continuous salt spray test, and press formability was indicated by the amount of plating peeled off after the test in a drawbead test.
第
表
第１表から明らかなように、比較用電気めっき鋼板Ｎｏ
１〜４のプレス成形性は、めっき剥離量が２．２ｇ／
−以上であって悪く、且つ、 その耐食性も４０〜３０
０時間であった。これに対して、本発明電気めっき鋼板
Ｎα１〜５のプレス成形性は、めっき剥離量が０．４〜
０．９ｇ／ｒｄであって極めて良好であり、耐食性も優
れていた。As is clear from Table 1, comparative electroplated steel sheet No.
The press formability of Nos. 1 to 4 is such that the amount of plating peeled off is 2.2 g/
- or more, which is bad, and its corrosion resistance is also 40 to 30
It was 0 hours. On the other hand, the press formability of the electroplated steel sheets Nα1 to Nα5 of the present invention is such that the amount of plating peeled off is 0.4 to
It was 0.9 g/rd, which was extremely good, and the corrosion resistance was also excellent.
以上述べたように、この発明によれば、プレスによって
厳しい成形加工が施されても、めっき層に削り落ちやパ
ウダリングが生ずることのない、自動車用鋼板として好
適な、耐食性およびプレス成形性に優れた亜鉛系電気め
っき鋼板が得られる工業上有用な効果が・もたらされる
。As described above, the present invention provides corrosion resistance and press formability suitable for automotive steel sheets, without causing scraping or powdering on the plating layer even when subjected to severe forming processing using a press. The industrially useful effect of obtaining an excellent zinc-based electroplated steel sheet is brought about.
図面はこの発明の亜鉛系電気めっき鋼板の一実施態様を
示す模式図である。図面において。
１・・・鋼板、 ２・・・めっき層、３・・・水
酸化亜鉛、 ４・・・シリカ粒子。
１１The drawing is a schematic diagram showing one embodiment of the zinc-based electroplated steel sheet of the present invention. In the drawing. DESCRIPTION OF SYMBOLS 1... Steel plate, 2... Plating layer, 3... Zinc hydroxide, 4... Silica particles. 11
Claims (1)
っき層を、その少なくとも１つの表面上に有する亜鉛系
電気めっき鋼板において、 前記シリカ粒子の各々の表面が水酸化亜鉛によって被覆
されていることを特徴とする、耐食性およびプレス成形
性に優れた亜鉛系電気めっき鋼板。 ２、各々の表面が前記水酸化亜鉛によって被覆されてい
る前記シリカ粒子の析出率が、０．１〜５ｗｔ．％の範
囲内である、請求項１記載の亜鉛系電気めっき鋼板。[Scope of Claims] 1. A zinc-based electroplated steel sheet having, on at least one surface thereof, a zinc-based plating layer in which silica particles are uniformly dispersed and precipitated, wherein the surface of each of the silica particles is coated with water. A zinc-based electroplated steel sheet with excellent corrosion resistance and press formability, characterized by being coated with zinc oxide. 2. The precipitation rate of the silica particles whose surfaces are coated with the zinc hydroxide is 0.1 to 5 wt. %. The zinc-based electroplated steel sheet according to claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4369790A JPH03247797A (en) | 1990-02-23 | 1990-02-23 | Electrogalvanized steel sheet excellent in corrosion resistance and press formability |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4369790A JPH03247797A (en) | 1990-02-23 | 1990-02-23 | Electrogalvanized steel sheet excellent in corrosion resistance and press formability |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03247797A true JPH03247797A (en) | 1991-11-05 |
Family
ID=12671023
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4369790A Pending JPH03247797A (en) | 1990-02-23 | 1990-02-23 | Electrogalvanized steel sheet excellent in corrosion resistance and press formability |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03247797A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63199899A (en) * | 1987-02-12 | 1988-08-18 | Nkk Corp | Production of dispersion-galvanized steel sheet having high corrosion resistance |
| JPH01136995A (en) * | 1987-11-20 | 1989-05-30 | Nippon Parkerizing Co Ltd | Composite zinc or zinc-based alloy plating method |
-
1990
- 1990-02-23 JP JP4369790A patent/JPH03247797A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63199899A (en) * | 1987-02-12 | 1988-08-18 | Nkk Corp | Production of dispersion-galvanized steel sheet having high corrosion resistance |
| JPH01136995A (en) * | 1987-11-20 | 1989-05-30 | Nippon Parkerizing Co Ltd | Composite zinc or zinc-based alloy plating method |
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