JPH02194156A - Galvanizing method for hardly galvanizable steel sheet - Google Patents
Galvanizing method for hardly galvanizable steel sheetInfo
- Publication number
- JPH02194156A JPH02194156A JP1001089A JP1001089A JPH02194156A JP H02194156 A JPH02194156 A JP H02194156A JP 1001089 A JP1001089 A JP 1001089A JP 1001089 A JP1001089 A JP 1001089A JP H02194156 A JPH02194156 A JP H02194156A
- Authority
- JP
- Japan
- Prior art keywords
- plating
- hot
- steel sheet
- dip
- alloy
- 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
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 49
- 239000010959 steel Substances 0.000 title claims abstract description 49
- 238000000034 method Methods 0.000 title claims description 11
- 238000005246 galvanizing Methods 0.000 title abstract 3
- 238000007747 plating Methods 0.000 claims abstract description 87
- 238000009713 electroplating Methods 0.000 claims abstract description 27
- 229910000521 B alloy Inorganic materials 0.000 claims abstract description 26
- 229910052796 boron Inorganic materials 0.000 claims abstract description 5
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 claims description 3
- 239000012535 impurity Substances 0.000 claims description 3
- 230000008021 deposition Effects 0.000 claims description 2
- 230000007797 corrosion Effects 0.000 abstract description 25
- 238000005260 corrosion Methods 0.000 abstract description 25
- 229910052804 chromium Inorganic materials 0.000 abstract description 9
- 238000007598 dipping method Methods 0.000 abstract description 5
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 abstract description 3
- 229910052782 aluminium Inorganic materials 0.000 abstract description 3
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 abstract description 2
- 229910001297 Zn alloy Inorganic materials 0.000 abstract 3
- 230000007547 defect Effects 0.000 description 14
- 239000000463 material Substances 0.000 description 10
- 239000010410 layer Substances 0.000 description 9
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 9
- 230000000694 effects Effects 0.000 description 7
- 238000012360 testing method Methods 0.000 description 6
- 230000007423 decrease Effects 0.000 description 3
- 230000003628 erosive effect Effects 0.000 description 3
- 229910052698 phosphorus Inorganic materials 0.000 description 3
- 150000003839 salts Chemical class 0.000 description 3
- 229910052717 sulfur Inorganic materials 0.000 description 3
- 238000000137 annealing Methods 0.000 description 2
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 description 2
- 239000004327 boric acid Substances 0.000 description 2
- 239000011247 coating layer Substances 0.000 description 2
- 238000003618 dip coating Methods 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- VGTPKLINSHNZRD-UHFFFAOYSA-N oxoborinic acid Chemical compound OB=O VGTPKLINSHNZRD-UHFFFAOYSA-N 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000002344 surface layer Substances 0.000 description 2
- GDTSJMKGXGJFGQ-UHFFFAOYSA-N 3,7-dioxido-2,4,6,8,9-pentaoxa-1,3,5,7-tetraborabicyclo[3.3.1]nonane Chemical compound O1B([O-])OB2OB([O-])OB1O2 GDTSJMKGXGJFGQ-UHFFFAOYSA-N 0.000 description 1
- 229910001335 Galvanized steel Inorganic materials 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000010953 base metal Substances 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 150000001639 boron compounds Chemical class 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 239000008397 galvanized steel Substances 0.000 description 1
- 239000010437 gem Substances 0.000 description 1
- 238000007602 hot air drying Methods 0.000 description 1
- 239000012943 hotmelt Substances 0.000 description 1
- 229910000765 intermetallic Inorganic materials 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 1
- 230000020477 pH reduction Effects 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 238000013441 quality evaluation Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000007921 spray 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
- -1 tetrafluoroborate Chemical compound 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
Landscapes
- Coating With Molten Metal (AREA)
- Other Surface Treatments For Metallic Materials (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、屋根・壁などの建築部材、自動車用構造部材
などに使用する耐食性に優れた溶融Ｚｎベースめっき鋼
板の製造方法に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for manufacturing hot-dip Zn-based plated steel sheets with excellent corrosion resistance for use in architectural members such as roofs and walls, structural members for automobiles, and the like.
近年、大気環境の酸性化や海上構造物の建設などにより
、建築部材の耐食性向上が強く要求されるようになって
きた。また、自動車の構造部材の場合には、積雪の多い
地方で使用されている凍結防止用の塩類散布による塩害
腐食も大きな問題となっている。In recent years, due to the acidification of the atmospheric environment and the construction of offshore structures, there has been a strong demand for improved corrosion resistance of building materials. In addition, in the case of structural members of automobiles, salt corrosion due to spraying of anti-freezing salts used in areas with heavy snowfall has also become a major problem.
現在、このような用途に使用される材料として溶融Ｚｎ
ベースめっき鋼板が用いられている。Currently, molten Zn is the material used for such applications.
Base plated steel plate is used.
一般に、溶融Ｚｎベースめっき鋼板は、厳しい加工を受
け、めっき層が破断して鋼素地が局部的に露出しても、
鋼素地とめっき層との間でＺｎの犠牲防食作用があるの
で、ある程度は鋼素地の腐食が抑制される。しかし、局
部的に露出した鋼素地近傍のめっき層の腐食速度が平坦
部に比べ太きくなるので、結果として早期に鋼素地の腐
食が始まる。Generally, hot-dip Zn-based plated steel sheets undergo severe processing, and even if the coating layer ruptures and the steel base is locally exposed,
Since Zn has a sacrificial anticorrosion effect between the steel base and the plating layer, corrosion of the steel base is suppressed to some extent. However, the corrosion rate of the plating layer in the vicinity of the locally exposed steel base is greater than that in the flat area, and as a result, the steel base begins to corrode at an early stage.
したがって、このように、めっき層が加工により割れて
局部的に露出した鋼素地の耐食性を向上させるには、め
っき母材自身の耐食性を向上させる必要がある。Therefore, in order to improve the corrosion resistance of the steel substrate where the plating layer is cracked and locally exposed due to processing, it is necessary to improve the corrosion resistance of the plating base material itself.
一般に、鋼板の耐食性を向上させるには、鋼中ＳＬ、
Ｃｒを単独あるいは複合添加することがよく知られてい
る。しかし、鋼中にＳｉあるいはＣｒを、含有した鋼板
を連続めっきライン（例えば、センジミアの装置）で溶
融めっきする場合には、ライン内の焼鈍工程でＳｉある
いはＣｒが鋼板表層へ濃化してめっきぬれ性を阻害し１
点状のめっき欠陥（不めっき）を多数発生する。その結
果、このめっき欠陥部を起点とした腐食が生じ、かえっ
て溶融Ｚｎベースめっき鋼板の耐食性が低下してしまう
。Generally, in order to improve the corrosion resistance of steel plates, SL in steel,
It is well known to add Cr alone or in combination. However, when a steel plate containing Si or Cr is hot-dipped on a continuous plating line (for example, Sendzimir equipment), Si or Cr concentrates on the surface layer of the steel plate during the annealing process in the line, resulting in wetting of the plating. inhibit sex 1
Many point-like plating defects (non-plating) occur. As a result, corrosion occurs starting from this plating defect, and the corrosion resistance of the hot-dip Zn-based plated steel sheet is rather reduced.
そこで、ＳＬあるいはＣｒを含有した鋼板に、あらかじ
めＮｉ系電気めっきを行なって、溶融めっきラインの焼
鈍工程で生じるＳｉやＣｒの表層１化を抑制する溶融め
っき法が提案されている。（特開昭６０−２６２９５０
、特開昭６ｌ−１４７８６５）しかしながら、このよう
なニッケルプレめっきは非常に高価であるとともに、溶
融Ｚｎベースめっき後のめっき鋼中にＮｉが残存し、め
っき層自身の耐食性を低下させるという問題がある。Therefore, a hot-dip plating method has been proposed in which a steel plate containing SL or Cr is subjected to Ni-based electroplating in advance to suppress the formation of Si or Cr in the surface layer 1, which occurs in the annealing process of a hot-dip plating line. (Unexamined Japanese Patent Publication No. 60-262950
However, such nickel pre-plating is very expensive and has the problem that Ni remains in the plated steel after hot-dip Zn-based plating, reducing the corrosion resistance of the plated layer itself. be.
〔問題解決に関する知見〕
本発明は、Ｓｉおよび／またはｃｒを含有する鋼板に溶
融Ｚｎベースめっきをする時に発生する点状めっき欠陥
を防止することを課題とし、課ＭＭ決に関し、鋭意研究
した結果、Ｓｉおよび／またはＣｒを含有する鋼板にＢ
（ホウ素）含有率が０．００１〜０．３冒ｔ％のＦｅ−
Ｂ合金電気めっきを施した後、溶融Ｚｎベースめっきす
ることにより、点状のめっき欠陥の発生を防止し、かつ
耐食性に優れた溶融Ｚｎベースめっき鋼板が得られると
いう知見を得た。[Knowledge related to problem solving] The present invention aims to prevent point-like plating defects that occur when hot-dip Zn-based plating is applied to steel sheets containing Si and/or Cr, and is the result of intensive research regarding section MM resolution. , B on the steel plate containing Si and/or Cr
(Boron) content of 0.001 to 0.3% Fe-
We have found that by performing hot-dip Zn-based plating after B alloy electroplating, it is possible to prevent the occurrence of point-like plating defects and to obtain a hot-dip Zn-based plated steel sheet with excellent corrosion resistance.
上記課」は、
Ｓｉおよび／またはＣｒを含有する鋼板に、Ｂ（ホウ素
）含有率が０．００１〜０．３すｔ％のＦｅ−Ｂ合金電
気めっきを附着量０．０５〜５ｇ／ゴ施した後、Ａｌ
： ０．１〜６０％、残部Ｚｎおよび不可避的不純物よ
りなる溶融Ｚｎベースめっき浴を用いて溶融めっきする
ことを特徴とする難めつき鋼板の溶融Ｚｎベースめっき
法によって達成される。The above section applies Fe-B alloy electroplating with a B (boron) content of 0.001 to 0.3 t% to a steel plate containing Si and/or Cr in an amount of 0.05 to 5 g/gou. After applying, Al
: Achieved by a hot-dip Zn-based plating method for a hard-to-plate steel sheet, which is characterized by hot-dip plating using a hot-dip Zn-based plating bath consisting of 0.1 to 60% Zn and the remainder Zn and unavoidable impurities.
本発明の方法において、溶融めっき用Ｚｎベース金属は
０．１〜６０％のＡ１を含むことができる。単味Ｚｎは
Ｆｅ素地と脆弱な金属間化合物を形成しやすいが、０．
１％以上のＡ１を含有させることによって、防止できる
。しかしａｌ含有量が６０％を趣えるとＺｎの犠牲防食
作用が低下する。In the method of the present invention, the Zn-based metal for hot dipping may contain 0.1-60% A1. Simple Zn tends to form a brittle intermetallic compound with Fe matrix, but 0.
This can be prevented by containing 1% or more of A1. However, when the Al content exceeds 60%, the sacrificial anticorrosion effect of Zn decreases.
以下、本発明を図面を参照して具体的に説明する。 Hereinafter, the present invention will be specifically explained with reference to the drawings.
第１図および第２図は、溶融Ｚｎベースのめっき性に及
ぼす被めっき鋼板中のＳｉおよびＣｒ含有率の影響をＦ
ｅ−Ｂ合金電気めっきの有無で比較した結果である。こ
こで溶融Ｚｎベースめっきのめっき性は、各鋼板（５０
Ｘ１５０ｎａ）を還元性雰囲気（５０％Ｈ，−Ｎ、、露
点（Ｄ、Ｐ、） ＝ −６０℃）でＺｎ−０，１８％Ａ
ｌ浴（４７０℃）に２秒間浸漬し、引き上げて得ためっ
き製品に発生した点状めっき欠陥の個数で判定したもの
である。Figures 1 and 2 show the effects of Si and Cr content in the steel sheet to be plated on hot-dip Zn-based plating.
These are the results of comparison between the presence and absence of e-B alloy electroplating. Here, the plating properties of hot-dip Zn-based plating are determined for each steel plate (50
Zn-0,18%A
The evaluation was made based on the number of point-like plating defects that appeared on the plated product obtained by immersing it in a bath (470° C.) for 2 seconds and pulling it out.
Ｃ溶融Ｚｎベースめっきのめっき性判定規準〕評点５：
点状めっき欠陥の発生のないもの評点４：直径１ｍ未満
の点状めっき欠陥５個以内のもの
評点３：直径１ｍ未満の点状めっき欠陥５個を超えるも
の
評点２：直径１ｍ未満の点状めっき欠陥多数発生するか
、または直径１ ＋ｒｔｎ以上の点状めっき欠陥発生す
るもの
評点１：直径ＩＩＩ！Ｉ１以上の点状めっき欠陥多数発
生するもの
第１図および第２図から明らかなように、鋼中のＳＬ含
有率が０．３％を超え、あるいはＣｒ含有率が２．０％
を超えると、ＳｉあるいはＣｒ含有率の増加とともに溶
融Ｚｎベースめっき性が低下し、著しい不めっきを発生
する。これに対して、Ｆｅ−Ｂ合金電気めっきを施した
場合には、電気めっきしない場合と比較して非常に良好
な溶融Ｚｎベースめっき性が得られることがわかる。こ
のように、Ｆｅ−Ｂ合全電気めっき後、溶融めっきする
本発明の溶融めっき法は、特に、鋼中のＳｉ含有率が０
、３ｗｔ％以上。C: Plating quality evaluation criteria for hot-dip Zn-based plating] Score 5:
No point plating defects Rating 4: Up to 5 dot plating defects less than 1 m in diameter Rating 3: More than 5 dot plating defects less than 1 m in diameter Rating 2: Dots less than 1 m in diameter A large number of plating defects or a point plating defect with a diameter of 1+rtn or more.Rating 1: Diameter III! Many point-like plating defects of I1 or higher occur.As is clear from Figures 1 and 2, the SL content in the steel exceeds 0.3%, or the Cr content exceeds 2.0%.
If it exceeds this, the hot-dip Zn base plating properties will decrease as the Si or Cr content increases, resulting in significant non-plating. On the other hand, it can be seen that when Fe-B alloy electroplating is applied, very good hot-dip Zn-based plating properties can be obtained compared to when no electroplating is performed. As described above, the hot-dip plating method of the present invention, in which hot-dip plating is performed after Fe-B alloy electroplating, is particularly effective when the Si content in the steel is 0.
, 3wt% or more.
あるいはＣｒ含有率が２．０ｗｔ５以上の難めつき鋼板
の溶融めっき性向上に非常に効果がある。また。Alternatively, it is very effective in improving the hot-dipping properties of hard-to-plating steel sheets with a Cr content of 2.0wt5 or more. Also.
第１図および第２図から、鋼中のＳｉ含有率あるいはＣ
ｒ含有率が増加するにしたがって、Ｆｅ−Ｂ合金めっき
のめっき付着量を増加させないと溶融Ｚｎベースめっき
性が不安定となることがわかる。したがって、被めっき
鋼板のＳｉ含有率あるいはＣｒ含有率によって溶融めっ
き性が良好となるＦｅ−Ｂ合金電気めっきの限界めっき
付着量が変化するが、経済性および実用性の観点から、
そのめっき付着量範囲は０．０５〜５ ｇｅｍが好まし
い。From Figures 1 and 2, it can be seen that the Si content or C
It can be seen that as the r content increases, the properties of hot-dip Zn-based plating become unstable unless the amount of Fe-B alloy plating is increased. Therefore, the critical coating weight for Fe-B alloy electroplating that provides good hot-dip coating properties varies depending on the Si content or Cr content of the steel sheet to be plated, but from the economic and practical standpoints,
The plating amount range is preferably 0.05 to 5 gems.
被めっき鋼板中の５１含有率ならびにＣｒ含有率につい
ては、それぞれの含有率が増加しても、Ｆｅ−Ｂ合金め
っき付着量を増加させれば良好な溶融めっき性が得られ
るが、Ｓｉ含有率が２．（ｈｔ％を、またＣｒ含有率が
３０ｖｔ％を超えると溶融めっき鋼板自身の加工性が低
下するので、鋼中のＳｉ含有率は２．０ｗｔ％以下、ｌ
ｌ中のＣｒ含有率は３０ｔｚｔ％以下が望ましい。なお
、被めっき鋼中に含有されるＣ、Ｍｎ、Ｐ、Ｓ、 Ａｌ
は、直接、溶融めっき性に影響を及ぼさないのでそれぞ
れの含有率を限定する理由はないが、めっき鋼板として
の総合的な品質特性を考慮した場合、Ｃ５０，１０ｙｔ
％、ＭｎＳ２．０ｗｔ％、Ｐ≦０．０５すｔ％、Ｓ≦０
．０５νｔ％、ＡＩ≦３ｔｚｔ％にすることが望ましい
。また、鋼中の添加元素として、丁ｘ、 Ｎｂ、 Ｖ、
Ｂ、Ｎｏ、 Ｃｕなどが知られているが、こ九らの元素
も溶融めっき性に影響を及ぼさないので必要に応じて添
加することは可能である。Regarding the 51 content and Cr content in the steel sheet to be plated, even if each content increases, good hot-dip plating properties can be obtained by increasing the amount of Fe-B alloy plating, but the Si content 2. (If the ht% or Cr content exceeds 30vt%, the workability of the hot-dipped steel sheet itself will decrease, so the Si content in the steel should be 2.0wt% or less, l
The Cr content in l is desirably 30 tzt% or less. In addition, C, Mn, P, S, Al contained in the steel to be plated
There is no reason to limit the content of each since they do not directly affect hot-dip coating properties, but when considering the overall quality characteristics of the plated steel sheet, C50.
%, MnS2.0wt%, P≦0.05st%, S≦0
．． It is desirable to set it to 05vt% and AI≦3tzt%. In addition, as additive elements in steel, Nb, V,
B, No, Cu, and the like are known, but since these elements do not affect hot-dip plating properties, they can be added as necessary.
Ｆｅ−Ｂ合金電気めっきは硫酸塩浴または塩化浴いずれ
でも実施できる。また、ＢをＦｅ中に含有させるには、
Ｆｅめっき浴にホウ酸、メタホウ酸、可溶性メタホウ
酸、可溶性４ホウ酸塩、テトラフルオロホウ酸塩などの
ホウ素化合物を１種または２種以上添加し、浴のＰＨを
１〜３に調整して電気めっきすればよい。Fe-B alloy electroplating can be carried out in either a sulfate bath or a chloride bath. In addition, in order to incorporate B into Fe,
One or more boron compounds such as boric acid, metaboric acid, soluble metaboric acid, soluble tetraborate, and tetrafluoroborate are added to the Fe plating bath, and the pH of the bath is adjusted to 1 to 3. It can be electroplated.
第３図は、Ｆｅ−Ｂ合金電気めっきを１．ｏｇ／ｄ施し
たＡｌ５Ｉ４０９ステンレス鋼板（Ｃｒ含有率： １１
．０ｗｔ％。Figure 3 shows Fe-B alloy electroplating in 1. Al5I409 stainless steel plate with og/d (Cr content: 11
．． 0wt%.
Ｓｉ含有率： ０．６ｗｔ％）の溶融Ｚｎベースめっき
性に及ぼすＦｅ−Ｂ合金めっき層中のＢ含有率の影響を
調査した結果である。なお、溶融Ｚｎベースめっき性の
判定は第１図の場合と同じである。These are the results of investigating the influence of the B content in the Fe-B alloy plating layer on the hot-dip Zn-based plating properties with a Si content of 0.6 wt%. Note that the determination of hot-dip Zn-based plating properties is the same as in the case of FIG.
第３図から明らかなように、Ｆｅ−Ｂ合金電気めっき層
中のＢ含有率が０．００１ｔｚｔ％以上では溶融Ｚｎベ
ースめっき性が著しく向上し、さらに０゜３ｗｔ％を超
えても溶融Ｚｎベースめっき性向上効果は飽和する。し
たがって、Ｆｅ−Ｂ合金電気めっきのＢ含有率を０．０
０１〜０．３ｗｔ％の範囲に限定した。このように、
Ｆｅ電気めっきに比べてＦｅ−Ｂ合金電気めっきはめっ
きの均−付き廻り性の点で優れている。As is clear from Fig. 3, when the B content in the Fe-B alloy electroplating layer is 0.001 tzt% or more, the molten Zn-based plating properties are significantly improved, and even when the B content exceeds 0.3 wt%, the molten Zn-based plating property is The effect of improving plating properties is saturated. Therefore, the B content of Fe-B alloy electroplating is set to 0.0.
It was limited to a range of 0.01 to 0.3 wt%. in this way,
Compared to Fe electroplating, Fe-B alloy electroplating is superior in terms of uniformity of plating.
次に、実施例により本発明を説明する。 Next, the present invention will be explained by examples.
実施例１
（１）めっき母材
化学成分として、Ｃ： ０．０６ｗｔ％、 Ｓｉ ：
０．６５ｗｔ％。Example 1 (1) Plating base material chemical components: C: 0.06wt%, Si:
0.65wt%.
Ｍｎ ： ０．３３ｔｚｔ％、Ｐ ： ０．０２４ｔｚ
ｔ％、Ｓ ： ０．０１０ｗｔ％、Ｃｒ： １７．８ｗ
ｔ％、残部Ｆｅおよび不可避的不純物より成る板厚０．
８ｍの冷間圧延５ＵＳ４３０ステンレス鋼板をめっき母
材とした。Mn: 0.33tzt%, P: 0.024tz
t%, S: 0.010wt%, Cr: 17.8w
t%, the balance is Fe and unavoidable impurities, and the plate thickness is 0.
An 8 m cold rolled 5US430 stainless steel plate was used as the plating base material.
（２）溶融Ｚｎベースめっき調律の製造前記めっき母材
を常法にしたがって脱脂した後、第１表に示しためっき
液組成およびめっき条件でＦｅ−Ｂ合金電気めっきを行
なった。Ｆｅ−Ｂ合金電気めっきのめっき付着量および
Ｂ含有率は、通電時間およびめっき液中へのホウ酸添加
量により調整した。なお、Ｆｅ−Ｂ合金電気めっきと比
較するため、塩化Ｎｉ浴でＮｉ電気めっきも行なった。(2) Production of hot-dip Zn-based plating tuning After the plating base material was degreased according to a conventional method, Fe-B alloy electroplating was performed using the plating solution composition and plating conditions shown in Table 1. The plating deposition amount and B content of Fe-B alloy electroplating were adjusted by the current application time and the amount of boric acid added to the plating solution. For comparison with Fe-B alloy electroplating, Ni electroplating was also performed in a Ni chloride bath.
Ｆｅ−Ｂ合金電気めっきしためっき母材は５０ｖｏｌ。The plating base material for Fe-B alloy electroplating is 50 vol.
％Ｈｚ−Ｎｚ雰囲気で８００℃、３０秒予熱した後、同
じ雰囲気下にある０、１８〜５５％Ａｔ−Ｚｎ浴に２秒
浸漬して溶融Ｚｎベースめっきを行ない、めっき層中の
Ａ１濃度の異なる、付着量が片面５０ｇ／ｍの溶融Ｚｎ
ベースめっき鋼板を作製した。%Hz-Nz atmosphere at 800°C for 30 seconds, and then immersed in a 0.18-55% At-Zn bath for 2 seconds in the same atmosphere to perform hot-dip Zn-based plating, and the A1 concentration in the plating layer was Melted Zn with different adhesion amount of 50 g/m on one side
A base plated steel sheet was produced.
第 表 験に供した。No. table Tested.
それぞれの腐食程度は、促進試験３０００サイクル後の
腐食生成物および残存被覆層を溶解、除去して母材の最
大侵食深さを測定して評価した。The degree of each corrosion was evaluated by dissolving and removing the corrosion products and remaining coating layer after 3000 cycles of the accelerated test and measuring the maximum corrosion depth of the base material.
（３）溶融Ｚｎベースめっき性
このようにして得られた溶融Ｚｎベースめっき鋼板の表
面（５０ａ＋ Ｘ １００ｍ＋ａの範囲）に発生した点
状めっき欠陥の個数にて評価した。（評価規準は先に記
載した通り）
（４）促進腐食試験
前記溶融Ｚｎベースめっき鋼板をＪＩＳ Ｚ２２４８に
基づいて２を曲げ加工した後ＪＩＳ ２２３７１に基づ
く塩水噴霧試験を３時間、引き続いて５０℃、熱風乾燥
を１時間という工程を１サイクルとした促進腐食試第２
表は、促進試験３０００サイクル後の各試料の腐食状態
を母材の最大侵食深さについてまとめたものである。(3) Properties of hot-dip Zn-based plating The thus obtained hot-dip Zn-based plated steel sheet was evaluated based on the number of dot-like plating defects that occurred on the surface (in the range of 50 a + x 100 m + a). (Evaluation criteria are as described above) (4) Accelerated corrosion test After bending the hot-dip Zn-based plated steel sheet in accordance with JIS Z2248, it was subjected to a salt spray test in accordance with JIS 22371 for 3 hours, followed by a test at 50°C. Accelerated corrosion test No. 2 with one cycle of hot air drying for 1 hour
The table summarizes the corrosion state of each sample after 3000 cycles of accelerated testing in terms of the maximum erosion depth of the base metal.
めっき欠陥の著しい本発明外のおよび比較例融溶Ｚｎベ
ースめっき鋼板Ｈａ ｌ 、 ２２５ ｇ １３．１４
．１５゜１ｇ、 ２６．２７．２＆、 ３１．３９．４
０．４１．４４．５２．５３゜５４、５７．６５．６６
、７０．７８．７９．８０．８３．８５．９１゜９２、
９３．９６．１０４，１０５．１０６．１０９．１１７
は鋼板を貫通した孔食を起こしているのに対して、Ｂ含
有率がＯ，ＯＯ１〜０．３ｗｔ％のＦｅ−Ｂ合金電気め
っきを０．０５〜５ｇ／ｎ（施した後融溶Ｚｎベースめ
っきした本発明の溶融めっき鋼板８１１３．４，６．８
〜１０．１６゜１７、１９．２１〜２３．２９．３０．
３２．３４〜３６．４２．４３゜４５、４７〜４９．５
５．５６．５８．６０〜６２．６ｇ、 ６９．７１゜７
３〜７５．８１．８２．８４．８６〜８８．９４．９５
．９７．９９〜１０１、１０７．１０８．１１０．１１
２〜１１４は平坦部、２を曲げ加工部とも母材の侵食が
小さい。また、Ｎｉ電気めっきした後、融溶Ｚｎベース
めっきした試料ＮＱＩＩ。Non-inventive and comparative Zn-based galvanized steel sheets with significant plating defects Hal, 225 g 13.14
．． 15゜1g, 26.27.2&, 31.39.4
0.41.44.52.53゜54, 57.65.66
, 70.78.79.80.83.85.91°92,
93.96.104, 105.106.109.117
In contrast, the Fe-B alloy electroplating with a B content of 1 to 0.3 wt% of O,OO was applied at 0.05 to 5 g/n (after applying molten Zn). Base plated hot dip plated steel sheet 8113.4, 6.8 of the present invention
~10.16°17, 19.21~23.29.30.
32.34~36.42.43°45, 47~49.5
5.56.58.60~62.6g, 69.71°7
3~75.81.82.84.86~88.94.95
．． 97.99-101, 107.108.110.11
The erosion of the base material is small in both the flat portions 2 to 114 and the bent portions 2. In addition, sample NQII was subjected to Ni electroplating and then hot-melt Zn-based plating.
１２、２４．２５．３７．３ｇ、 ５０．５１．６３．
６４．７６、７７゜８９、９０．１０２．１０３．１１
５．１１６は、Ｎｉめっき付着量が増加するにしたがっ
て点状めっき欠陥の発生が抑えられるが、母材の侵食深
さは本発明の方法で作製した融溶Ｚｎベースめっき鋼板
より大きい。Ｎｉ電気めっきした後、融溶Ｚｎベースめ
っきした試料の場合はＺｎベースめっき層の腐食速度が
著しく大きくなるので、結果としてめっき母材の侵食深
さもおおきくなる。12, 24.25.37.3g, 50.51.63.
64.76, 77°89, 90.102.103.11
In No. 5.116, the occurrence of point-like plating defects is suppressed as the amount of Ni plating increases, but the erosion depth of the base material is larger than that of the hot-dip Zn-based plated steel sheet produced by the method of the present invention. In the case of a sample subjected to Ni electroplating and then hot-dip Zn base plating, the corrosion rate of the Zn base plating layer increases significantly, and as a result, the corrosion depth of the plating base material also increases.
本発明により、Ｓｉおよび／またはＣｒを含有する鋼板
に８含有率が０．００１〜０．３ｉ＋ｔ％のＦｅ−Ｂ合
金電気めっきを施した後融溶Ｚｎベースめっきする本発
明の溶融めっき法は、溶融めっき時に発生する点状めっ
き（不めっき）を防止し、耐食性の優れた融溶Ｚｎベー
スめっき鋼板を得ることができる。According to the present invention, the hot-dip plating method of the present invention is to apply Fe-B alloy electroplating with an 8 content of 0.001 to 0.3i+t% on a steel plate containing Si and/or Cr, and then hot-dip Zn-based plating. , it is possible to prevent spot plating (non-plating) that occurs during hot-dip plating, and to obtain a hot-dip Zn-based plated steel sheet with excellent corrosion resistance.
このＦｅ−８合金電気めっきによるめっき性の向上は、
溶融Ｚｎベースめっきのみならず、溶融アルミニウムめ
っきにも同様に適用できる。The improvement in plating properties due to this Fe-8 alloy electroplating is as follows:
It can be applied not only to molten Zn-based plating but also to molten aluminum plating.
第１図および第２図は、溶融Ｚｎベースめっき性に及ぼ
す被めっき鋼板中のＳｉおよびＣｒ含有率の影響をＦｅ
−Ｂ合金電気めっきの有無で比較した結果を示す図、第
３図は溶融Ｚｎベースめっき性に及ぼすＦｅ−Ｂ合金め
っき層中のＢの含有率の影響をＦｅ−Ｂ合金の付着量で
比較した結果を示す図である。Figures 1 and 2 show the effects of Si and Cr content in the steel sheet to be plated on hot-dip Zn-based plating properties.
Figure 3 shows the results of a comparison between the presence and absence of B alloy electroplating, and Figure 3 compares the effect of the B content in the Fe-B alloy plating layer on the hot-dip Zn-based plating properties based on the amount of Fe-B alloy deposited. It is a figure showing the result.
Claims (1)
ウ素）含有率が０．００１〜０．３ｗｔ％のＦｅ−Ｂ合
金電気めっきを附着量０．０５〜５ｇ／ｍ＾２施した後
；Ａｌ：０．１〜６０％残部Ｚｎおよび不可避的不純物
よりなる溶融Ｚｎベースめっき浴を用いて溶融めっきす
ることを特徴とする難めっき鋼板の溶融Ｚｎベースめっ
き法。1. After applying Fe-B alloy electroplating with a B (boron) content of 0.001 to 0.3 wt% to a steel plate containing Si and/or Cr at a deposition amount of 0.05 to 5 g/m^2 A hot-dip Zn-based plating method for a steel sheet that is difficult to plate, characterized in that hot-dip plating is carried out using a hot-dip Zn-based plating bath containing Al: 0.1 to 60% balance Zn and unavoidable impurities.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1001089A JP2756547B2 (en) | 1989-01-20 | 1989-01-20 | Hot-dip Zn-based plating of hard-to-plate steel sheet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1001089A JP2756547B2 (en) | 1989-01-20 | 1989-01-20 | Hot-dip Zn-based plating of hard-to-plate steel sheet |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02194156A true JPH02194156A (en) | 1990-07-31 |
| JP2756547B2 JP2756547B2 (en) | 1998-05-25 |
Family
ID=11738431
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1001089A Expired - Lifetime JP2756547B2 (en) | 1989-01-20 | 1989-01-20 | Hot-dip Zn-based plating of hard-to-plate steel sheet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2756547B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1993011271A1 (en) * | 1991-12-06 | 1993-06-10 | Kawasaki Steel Corporation | Method of manufacturing molten zinc plated steel plates having few unplated portions |
| JPH0688251A (en) * | 1992-09-10 | 1994-03-29 | Nippon Steel Corp | Si containing high strength galvannealed steel sheet |
| US6087019A (en) * | 1996-05-31 | 2000-07-11 | Kawasaki Steel Corporation | Plated steel sheet |
-
1989
- 1989-01-20 JP JP1001089A patent/JP2756547B2/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1993011271A1 (en) * | 1991-12-06 | 1993-06-10 | Kawasaki Steel Corporation | Method of manufacturing molten zinc plated steel plates having few unplated portions |
| US5433796A (en) * | 1991-12-06 | 1995-07-18 | Kawasaki Steel Corporation | Method for preparing galvanized steel strip having minimal uncoated defects |
| JPH0688251A (en) * | 1992-09-10 | 1994-03-29 | Nippon Steel Corp | Si containing high strength galvannealed steel sheet |
| US6087019A (en) * | 1996-05-31 | 2000-07-11 | Kawasaki Steel Corporation | Plated steel sheet |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2756547B2 (en) | 1998-05-25 |
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