JPS5952945B2 - Zinc alloy for hot-dip plating - Google Patents
Zinc alloy for hot-dip platingInfo
- Publication number
- JPS5952945B2 JPS5952945B2 JP903280A JP903280A JPS5952945B2 JP S5952945 B2 JPS5952945 B2 JP S5952945B2 JP 903280 A JP903280 A JP 903280A JP 903280 A JP903280 A JP 903280A JP S5952945 B2 JPS5952945 B2 JP S5952945B2
- Authority
- JP
- Japan
- Prior art keywords
- hot
- zinc alloy
- plating
- dip plating
- corrosion resistance
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
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
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
- C23C2/06—Zinc or cadmium or alloys based thereon
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Coating With Molten Metal (AREA)
Description
【発明の詳細な説明】
この発明は、溶融メッキ用亜鉛合金に係り、特に鉄鋼材
料の表面を溶融メッキするのに用いた場合にすぐれた耐
粒界腐食性を示す亜鉛合金に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a zinc alloy for hot-dip plating, and particularly to a zinc alloy that exhibits excellent intergranular corrosion resistance when used for hot-dip plating the surface of a steel material.
従来、一般に、鉄鋼材料の表面を溶融メッキするのに用
いられる亜鉛合金としては、蒸留亜鉛に０．２重量％程
度（以下％はすべて重量％を意味する）のＡｌを含有さ
せた標準組成を有する亜鉛合金が知られており、耐食性
および美観性の点で良好な結果を示すことから広く使用
に供されているが、最近、前記従来亜鉛合金を用いて溶
融メッキした鉄鋼材料には、粒界腐食によるトラブルが
多発しているのが現状である。Conventionally, zinc alloys used for hot-dip plating the surfaces of steel materials generally have a standard composition of distilled zinc containing about 0.2% by weight (all percentages by weight) of Al. Zinc alloys are known and are widely used because they show good results in terms of corrosion resistance and aesthetics. At present, troubles due to interfacial corrosion are occurring frequently.
すなわち、上記従来亜鉛合金を使用して、例えば連続亜
鉛メッキラインで製造されたミニマムスパングル製品に
おいて、製造後数ケ月で、折り曲げ加工時にメッキ皮膜
に剥離現象が発生しており、これはメッキ皮膜の粒界腐
食に原因するものであり、しかも不可避不純物としての
Ｐｂの含有量が高いほど粒界腐食が著しいことが明らか
にされている。本発明者等は、上述のような観点から、
鉄鋼材料の表面に溶融メッキを施した場合に、良好な耐
食性および美観性を有し、かつ特に不可避不純物として
含有するＰｂの含有量に関係なく、すぐれた耐粒界腐食
性を示す、すなわち折り曲げ加工などを施した場合にも
メツキ皮膜の剥離がない溶融メツキ用亜鉛合金を開発す
べく、特に鉄鋼材料の溶融亜鉛メツキに際しては、その
メツキ面に形成される脆いＺｎ−Ｆｅ合金層の発達を抑
制する必要から０．２％程度のＡｌの含有は不可欠であ
り、またメツキ浴中には被メツキ材たる鉄鋼材料から０
．０３％程度のＦｅが溶出し、さらに亜鉛母材として通
常の蒸留亜鉛を使用した場合には最高で０．３％程度の
Ｐｂの含有は避けられないことから、不純物としてＦｅ
：約０．０３％、Ｐｂ：約０．２％を含有し、かつ合金
成分としてＡ１を０．２％程度含有する亜鉛合金に着目
し、この亜鉛合金にすぐれた耐粒界腐食性を付与すべく
種々研究を行なつた結果、前記亜鉛合金に、Ｍｎ：０．
０１〜１．０％およびＭｇ：０．００５〜０．１％を併
用添加含有させると、著しくすぐれた耐粒界腐食性をも
つようになり、しかもＭｎおよびＭｇを前記の量含有す
る亜鉛合金においては、Ａｌの含有量を０．０５〜２．
０％の範囲に拡大しても耐粒界腐食性が何ら害なわれる
ものではないという知見を得たのである。In other words, in minimum spangle products manufactured on a continuous galvanizing line using the conventional zinc alloy mentioned above, a peeling phenomenon occurs in the plating film during the bending process several months after production. This is caused by intergranular corrosion, and it has been revealed that the higher the content of Pb as an unavoidable impurity, the more severe the intergranular corrosion. The present inventors, from the above-mentioned viewpoint,
When hot-dip plating is applied to the surface of a steel material, it has good corrosion resistance and aesthetic appearance, and exhibits excellent intergranular corrosion resistance regardless of the content of Pb, which is an unavoidable impurity. In order to develop a zinc alloy for hot-dip plating that does not cause the plating film to peel off even when processed, it is necessary to develop a brittle Zn-Fe alloy layer that forms on the plating surface, especially when hot-dip galvanizing steel materials. It is essential to contain approximately 0.2% Al in order to suppress the amount of Al contained in the plating bath.
．． Approximately 0.3% of Fe is eluted, and if ordinary distilled zinc is used as the zinc base material, it is unavoidable to contain up to approximately 0.3% of Pb.
We focused on a zinc alloy that contains about 0.03% of Pb, about 0.2% of Pb, and about 0.2% of A1 as an alloy component, and gave this zinc alloy excellent intergranular corrosion resistance. As a result of conducting various studies in order to achieve this goal, we found that Mn: 0.
When 0.01 to 1.0% and Mg: 0.005 to 0.1% are added in combination, the zinc alloy has extremely excellent intergranular corrosion resistance and further contains Mn and Mg in the above amounts. In this case, the Al content is 0.05 to 2.
They have found that even if the content is increased to 0%, the intergranular corrosion resistance will not be affected in any way.
したがつて、この発明は、上記知見にもとづいてなされ
たものであつて、Ａｌを０．０５〜２．０％含有させる
ことによつて被メツキ材たる鉄鋼材料のメツ舞面に形成
される脆いＺｎ−Ｆｅ合金層の発達を抑餌眺Ｊか２東但
−↓．９％の畢、および０．００５〜０．１％のＭｇを
併用添加會有劃サ春こと仁よ．つて、特に不可避不純物
と七てのＰｂの含有量に関係なく、すぐれた耐粒界腐食
性を確保するようにした溶融メツキ用軍鉛合金に特徴を
有するものである。Therefore, this invention was made based on the above knowledge, and by containing 0.05 to 2.0% of Al, it is possible to form a plating surface of a steel material to be plated. Suppressing the development of the brittle Zn-Fe alloy layer. 9% Bi and 0.005 to 0.1% Mg are added together. In particular, the present invention is characterized by a military lead alloy for hot-dip plating that ensures excellent intergranular corrosion resistance regardless of the content of unavoidable impurities and Pb.
ついで、この発明の溶融メツキ用亜鉛合金において、Ａ
ｌ，Ｍｎ，およびＭｇの含有量を上記の通りに限定した
理由を説明する。Next, in the zinc alloy for hot-dip plating of this invention, A
The reason why the contents of L, Mn, and Mg are limited to the above values will be explained.
（ａ）Ａｌ
Ａｌ成分には、上記のように鉄鋼材料の溶融メツキ面に
形成される胞いＺｎ−Ｆｅ合金層の発達を抑制する作用
があるが、その含有量が０．０５％未満では前記作用に
所望の効果が得られず、一方２．０％を越えて含有させ
ても前記作用により一層の改善効果はないことから、そ
の含有量を０．０５〜２．０％と定めた。(a) Al The Al component has the effect of suppressing the development of the porous Zn-Fe alloy layer formed on the hot-dip plating surface of the steel material as described above, but if its content is less than 0.05%, The desired effect was not obtained in the above action, and on the other hand, even if the content exceeded 2.0%, there was no further improvement effect due to the above action, so the content was set at 0.05 to 2.0%. .
（ｂ）ＭｎおよびＭｇ
ＭｎおよびＭｇ成分には、これら両成分を併用添加含有
させた場合、、特に不可避不純物としてのＰｂの含有量
が高くても、合金の耐粒界腐食性を改善する作用がある
が、ＭｎおよびＭｇのいずれか、あるいは両方の含有量
が、Ｍｎ：０．０１％未満、Ｍｇ：０．００５％未満の
含有では、前記作用に所望の効果が得られず、一方Ｍｎ
：１．０％およびＭｇ：０．１％を越えて含有させても
、より一層の改善効果が得られないことから、Ｍｎおよ
びＭｇの含有量を、Ｍｎ：０．０１〜１．０％、Ｍｇ：
０．００５〜０．１％と定めた。(b) Mn and Mg When both of these components are added together, Mn and Mg have the effect of improving the intergranular corrosion resistance of the alloy, even if the content of Pb as an unavoidable impurity is particularly high. However, if the content of either or both of Mn and Mg is less than 0.01% Mn and less than 0.005% Mg, the desired effect cannot be obtained;
Even if the content exceeds Mn: 1.0% and Mg: 0.1%, further improvement effects cannot be obtained. , Mg:
It was set at 0.005 to 0.1%.
つぎに、この発明の亜鉛合金を実施例により比較例と対
比しながら説明する。実施例
それぞれ第１表に示される成分組成を有し、かつ不可避
不純物としてのＰｂの含有量が０．２％の亜鉛合金のメ
ツキ浴を用意し、ついでメツキ浴温：４６０℃を有する
前記メツキ浴中に、それぞれＺｎＣｌ２−ＮＨ４Ｃｌ系
フラツクスで処理した厚さ０．６ＦＩ］ｍを有する鋼板
を２０秒間浸漬することによつて、前記鋼板表面に片面
厚さ５０μｍの本発明亜鉛合金１〜８および比較亜鉛合
金１〜１５からなるメツキ層をそれぞれ形成した。Next, the zinc alloy of the present invention will be explained using examples and comparing with comparative examples. A plating bath of a zinc alloy having the composition shown in Table 1 and containing 0.2% of Pb as an unavoidable impurity was prepared, and then the plating bath having a plating bath temperature of 460°C was prepared. By immersing a steel plate having a thickness of 0.6 FI]m, each treated with a ZnCl2-NH4Cl-based flux, in the bath for 20 seconds, zinc alloys 1 to 8 and 8 of the present invention each having a thickness of 50 μm on one side were deposited on the surface of the steel plate. Plating layers each consisting of comparative zinc alloys 1 to 15 were formed.
ついで、この結果得られた本発明亜鉛合金１〜８および
比較亜鉛合金１〜１５のそれぞれのメツキ層を有する溶
融メツキ鋼板に対して、温度：７０℃、相対湿度：９８
％、試験時間：１００時間の条件で湿潤試験を行ない、
試験後のメツキ層における粒界侵食深さを測定した。Next, the resulting hot-dip galvanized steel sheets having the plating layers of the present invention zinc alloys 1 to 8 and comparative zinc alloys 1 to 15 were heated at a temperature of 70°C and a relative humidity of 98°C.
%, test time: A wet test was conducted under the conditions of 100 hours,
The depth of grain boundary erosion in the plating layer after the test was measured.
この測定結果を第１表に合せて示した。第１表に示され
る結果から、不可避不純物としてのＰｂの含有量が高い
場合（０．２％Ｐｂ含有）には、Ｍｎ単独含有では所望
の耐粒界腐食性を確保することができず（比較亜鉛合金
１〜９参照）、またＭｎの含有量がこの発明の範囲内に
あつてもＭｇの含有量がこの発明の範囲から低い方に外
れると、同様に所望の耐粒界腐食性が得られないことが
明らかである。The measurement results are also shown in Table 1. From the results shown in Table 1, when the content of Pb as an unavoidable impurity is high (containing 0.2% Pb), the desired intergranular corrosion resistance cannot be ensured with Mn alone ( (See Comparative Zinc Alloys 1 to 9), and even if the Mn content is within the range of this invention, if the Mg content is lower than the range of this invention, the desired intergranular corrosion resistance may be similarly impaired. It is clear that it cannot be obtained.
これに対して、Ｍｎおよび゛Ｍｇの含有量がこの発明の
範囲内にある場合には、Ｐｂの含有量が高くても前記両
成分の併用含有効果によつてすぐれた耐粒界腐食性を示
すことが明らかである。また、第１表には、この発明の
範囲から高い方に外れてＭｇ（Ｍｎ）を含有させても、
耐粒界腐食性により一層の改善効果が得られないことが
示されている。上述のように、この発明の亜鉛合金は、
特に鉄鋼材料の溶融メツキに使用した場合に、不可避不
純物としてのＰｂの含有量に関係なく、ＭｎおよびＭｇ
の併用添加含有によつてすぐれた耐粒界腐食性を示すも
のであり、したがつて、この発明の亜鉛合金によつて溶
融メツキされた鉄鋼材料においては、折り曲げ加工時な
どに、メツキ層の粒界腐食が原因のメツキ層剥離現象が
皆無となることから、長期に亘る使用寿命が確保されて
、信頼性が高くなるなど工業上有用な効果をもたらすも
のである。On the other hand, when the contents of Mn and Mg are within the range of the present invention, even if the content of Pb is high, excellent intergranular corrosion resistance can be achieved due to the effect of the combined inclusion of both components. It is clear to show. Table 1 also shows that even if Mg (Mn) is contained higher than the scope of the present invention,
It has been shown that no further improvement in intergranular corrosion resistance can be obtained. As mentioned above, the zinc alloy of this invention is
Especially when used for hot-dip plating of steel materials, Mn and Mg
It exhibits excellent intergranular corrosion resistance due to the combined addition of Since there is no plating layer peeling phenomenon caused by intergranular corrosion, a long service life is ensured and reliability is increased, which brings about industrially useful effects.
Claims (1)
耐粒界腐食性にすぐれた溶融メッキ用亜鉛合金。[Claims] 1 Al: 0.05 to 2.0%, Mn: 0.01 to 1.0%, Mg: 0.005 to 0.1%, Zn and unavoidable impurities: remainder, (by weight %) for hot-dip plating, which has excellent intergranular corrosion resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP903280A JPS5952945B2 (en) | 1980-01-29 | 1980-01-29 | Zinc alloy for hot-dip plating |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP903280A JPS5952945B2 (en) | 1980-01-29 | 1980-01-29 | Zinc alloy for hot-dip plating |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS56108846A JPS56108846A (en) | 1981-08-28 |
| JPS5952945B2 true JPS5952945B2 (en) | 1984-12-22 |
Family
ID=11709305
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP903280A Expired JPS5952945B2 (en) | 1980-01-29 | 1980-01-29 | Zinc alloy for hot-dip plating |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5952945B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3728298B2 (en) * | 2003-05-28 | 2005-12-21 | 新日本製鐵株式会社 | Hot-dip Zn-Al alloy-plated steel and method for producing the same |
| JP4157522B2 (en) * | 2004-12-28 | 2008-10-01 | サクラテック株式会社 | High corrosion resistance / high workability plated steel wire, plating bath composition, high corrosion resistance / high workability plated steel wire manufacturing method, and wire mesh product |
| CN102465218A (en) * | 2010-11-05 | 2012-05-23 | 宁波豪生电池有限公司 | Environment-friendly zinc-manganese alloy and zinc-manganese battery |
-
1980
- 1980-01-29 JP JP903280A patent/JPS5952945B2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS56108846A (en) | 1981-08-28 |
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