JP2964678B2 - Zn-Al alloy plating method - Google Patents
Zn-Al alloy plating methodInfo
- Publication number
- JP2964678B2 JP2964678B2 JP6389391A JP6389391A JP2964678B2 JP 2964678 B2 JP2964678 B2 JP 2964678B2 JP 6389391 A JP6389391 A JP 6389391A JP 6389391 A JP6389391 A JP 6389391A JP 2964678 B2 JP2964678 B2 JP 2964678B2
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- Japan
- Prior art keywords
- plating
- weight
- bath
- same manner
- temperature
- Prior art date
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Description
【０００１】[0001]
【産業上の利用分野】本発明は、耐食性に優れ、不めっ
き部の発生のないＺｎ−Ａｌ合金めっきを１回のめっき
処理で形成することができるＺｎ−Ａｌ合金めっき方法
に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a Zn-Al alloy plating method which is excellent in corrosion resistance and can form a Zn-Al alloy plating free of unplated portions by a single plating process.
【０００２】[0002]
【従来の技術】従来から自動車部品、建築材料など構造
材料として利用されている鉄鋼材料の腐食を防止するこ
とを目的として、溶融亜鉛めっき法あるいは電気めっき
法などによって亜鉛をめっきすることが広く実施されて
いる。最近では、亜鉛めっき処理を下地として施した
後、さらに、その面上に表面処理、たとえば、塗装や別
途の表面処理などの後処理を重ねて施工することによっ
て付加価値を一層高めた商品が数多く市場に提供される
ようになり、市場の選択や要望も多様化してきている。2. Description of the Related Art For the purpose of preventing corrosion of steel materials conventionally used as structural materials such as automobile parts and building materials, zinc plating is widely performed by hot dip galvanizing or electroplating. Have been. Recently, there have been many products that have added value by further applying a surface treatment, for example, painting or a separate surface treatment, after applying a galvanizing treatment as a base, and then applying it. It has been provided to the market, and market choices and requests have been diversified.
【０００３】これらの要求を満足させるために、使用す
るめっき浴の添加元素と添加量の選択によって、めっき
層の特性向上を図ることが行われている。その１つとし
て、めっき層の耐食性を確保するために、Ａｌを３〜１
０重量％程度添加しためっき浴が知られている。しかし
ながら、このめっき浴を使用した場合、めっき層がのら
ない不めっき部分が生じ易いものである。又、この不め
っき発生を防止する手段として種々の特殊なフラックス
も開発されているが、これらを使用しても通常のめっき
温度である４３０〜４９０℃では、厳しい環境でも十分
な耐食性を持つために必要な付着量（３００ｇ／ｍ２）
を得ることはできず、せいぜい２００ｇ／ｍ２の付着量
のめっき層しか得られないものである。[0003] In order to satisfy these requirements, it has been attempted to improve the characteristics of a plating layer by selecting an additive element and an additive amount of a plating bath to be used. As one of them, to ensure the corrosion resistance of the plating layer, Al
A plating bath to which about 0% by weight is added is known. However, when this plating bath is used, an unplated portion where the plating layer does not adhere tends to occur. Various special fluxes have also been developed as a means for preventing the occurrence of non-plating. However, even if these are used, at a normal plating temperature of 430 to 490 ° C., sufficient corrosion resistance is obtained even in a severe environment. Amount required for coating (300 g / m 2 )
Cannot be obtained, and only a plating layer having an adhesion amount of at most 200 g / m 2 can be obtained.
【０００４】そこで、現在では、初めにＡｌを含まない
亜鉛めっき浴を使用して１次めっきを行い、フラックス
処理をした後、Ａｌを３〜１０重量％添加したＺｎ−Ａ
ｌ合金めっき浴を使用して２次めっきを行う方法がとら
れている。Therefore, at present, primary plating is first performed using a zinc plating bath containing no Al, flux treatment is performed, and then Zn-A containing 3 to 10% by weight of Al is added.
A method of performing secondary plating using an 1 alloy plating bath has been adopted.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、前記２
回行うめっき方法は、めっき処理を２回行わねばならな
いので煩雑であり、当然、製造コストも嵩むという問題
がある。However, the above-mentioned 2
The plating method that is performed once is complicated because the plating process must be performed twice, and there is a problem that the manufacturing cost naturally increases.
【０００６】本発明は、１回のめっき処理で、不めっき
部の発生もなく、耐食性に優れ、かつ外観が良好なＺｎ
−Ａｌ合金めっき層が得られるめっき方法を提供するこ
とを目的とするものである。According to the present invention, a single plating treatment is carried out without generating unplated portions, having excellent corrosion resistance, and having a good appearance.
It is an object of the present invention to provide a plating method capable of obtaining an Al alloy plating layer.
【０００７】[0007]
【課題を解決するための手段】本発明者等は、前記問題
を解決し、前記目的を達成するために鋭意研究を進めた
結果、Ａｌを３〜１０重量％添加してなるＺｎ−Ａｌ合
金めっき浴は、浴温が４９０℃以上となると急激に付着
量が増大するが、めっき付着量の制御が難しくなり、こ
れにニッケルを特定量添加しためっき浴を使用すること
によって制御し得ることを見出して本発明を完成するに
至った。すなわち本発明は、Ａｌ３〜１０重量％、Ｎｉ
０．０１以上で０．１０重量％未満、残りＺｎ及び不可
避不純物からなるＺｎ−Ａｌ合金めっき浴を使用して、
浴温４９０〜６００℃でＺｎ−Ａｌ合金めっき処理をす
るＺｎ−Ａｌ合金めっき方法を特徴とするものである。Means for Solving the Problems The inventors of the present invention have made intensive studies to solve the above problems and achieve the above object. As a result, a Zn-Al alloy containing 3 to 10% by weight of Al has been obtained. When the bath temperature is 490 ° C. or higher, the coating amount increases rapidly. However, it is difficult to control the coating amount, and it can be controlled by using a plating bath to which a specific amount of nickel is added. The inventors have found and completed the present invention. That is, the present invention relates to the method of
Using a Zn-Al alloy plating bath consisting of 0.01 or more and less than 0.10% by weight, with the balance being Zn and unavoidable impurities,
The present invention is characterized by a Zn-Al alloy plating method of performing a Zn-Al alloy plating process at a bath temperature of 490 to 600 ° C.
【０００８】本発明において使用するＺｎ−Ａｌ合金め
っき浴においてＡｌの配合割合を３〜１０重量％とした
のは、Ａｌが３重量未満では、めっき層の耐食性を維持
する効果が著しく少なく、一方Ａｌの含有量が１０重量
％を超えても耐食性のより一層の向上が得られ難くなる
とともに、めっき浴の融点が上昇するために作業性が悪
くなるからである。The reason why the mixing ratio of Al in the Zn-Al alloy plating bath used in the present invention is 3 to 10% by weight is that if the Al content is less than 3%, the effect of maintaining the corrosion resistance of the plating layer is extremely small, while If the content of Al exceeds 10% by weight, it is difficult to further improve the corrosion resistance, and the melting point of the plating bath increases, so that the workability deteriorates.
【０００９】又、Ｎｉ０．０１以上で０．１０重量％未
満としたのは、Ｎｉの含有量が０．０１重量％未満で
は、めっき層の過剰付着が生じ、一方Ｎｉを０．１０重
量％以上含有させても、めっき層の過剰付着防止の効果
が必ずしも増大できないばかりでなく、更にＮｉがＡｌ
と金属間化合物を形成して、Ｎｉ−Ａｌ−Ｚｎ合金粒と
なってめっき浴中、特に表面付近を漂い、被めっき物の
引上げ時に表面に付着してブツブツを形成し外観を著し
く損うからである。The reason why the content of Ni is not less than 0.01% by weight and less than 0.10% by weight is that if the Ni content is less than 0.01% by weight, excessive adhesion of the plating layer occurs, while the Ni content is 0.10% by weight. Even if Ni is contained, not only the effect of preventing excessive adhesion of the plating layer cannot always be increased, but also Ni
And an intermetallic compound to form Ni-Al-Zn alloy particles, which drift in the plating bath, especially near the surface, adhere to the surface when the object to be plated is pulled up, form a bump, and significantly impair the appearance. is there.
【００１０】なお、本発明めっき浴を調製する際に使用
する亜鉛地金は、不可避不純物として、１．５重量％以
下の鉛、０．１重量％以下の鉄などを含有するものでも
用い得、アルミニウムは、純度９９．９重量％以上のア
ルミニウム地金を、ニッケルは、純度９９重量％以上の
ニッケル地金を用いることが好ましい。The zinc ingot used in preparing the plating bath of the present invention may be one containing 1.5% by weight or less of lead and 0.1% by weight or less of iron as inevitable impurities. , Aluminum is preferably an aluminum ingot having a purity of 99.9% by weight or more, and nickel is preferably a nickel ingot having a purity of 99% by weight or more.
【００１１】さらに、本発明のめっき処理は、前記組成
のＺｎ−Ａｌ合金めっき浴を使用して、浴温４９０〜６
００℃でめっき処理を行う方法であり、浴温を４９０〜
６００℃としたのは、浴温が４９０℃未満では、厳しい
腐食性環境でも十分な耐食性を得るのに十分なめっき付
着量とされる３００ｇ／ｍ２以上のめっき層を得ること
ができず、一方浴温が６００℃を超える温度でめっき処
理すると、Ｎｉの付着量制御作用がなくなってしまうか
らであり、また被めっき物の機械的強度を低下させ、更
にめっき作業の環境を著しく悪化させる。Further, the plating treatment of the present invention uses a Zn-Al alloy plating bath having the above-mentioned composition and a bath temperature of 490-6.
This is a method of performing a plating treatment at 00 ° C.
The reason for setting the temperature to 600 ° C. is that if the bath temperature is lower than 490 ° C., it is not possible to obtain a plating layer of 300 g / m 2 or more, which is a sufficient coating weight to obtain sufficient corrosion resistance even in a severe corrosive environment. On the other hand, if the plating treatment is performed at a bath temperature higher than 600 ° C., the effect of controlling the amount of Ni deposited is lost, and the mechanical strength of the object to be plated is reduced, and the environment for the plating operation is remarkably deteriorated.
【００１２】[0012]
【作用】本発明は、Ａｌ３〜１０重量％、Ｎｉ０．０１
以上で０．１０重量％未満、残りＺｎ及び不可避不純物
からなるＺｎ−Ａｌ合金めっき浴を使用して、浴温４９
０〜６００℃でめっき処理を行うＺｎ−Ａｌ合金めっき
方法であり、めっき浴中のＡｌは、めっき層の耐食性を
維持し、Ｎｉは、めっき層と被めっき物との密着性を改
善して、不めっき部発生を防ぎ、めっき層の過剰付着を
制御して防止すると共に、被めっき物の表面を平滑に保
ち、かつ均一なめっき層を形成するのに役立っているも
のであって、この両成分が存在する共に前記浴温範囲で
めっきすることによってＺｎ−Ａｌ合金めっきを１回の
めっき処理で可能としたものである。According to the present invention, Al 3 to 10% by weight, Ni 0.01
Using a Zn-Al alloy plating bath containing less than 0.10% by weight of the above and remaining Zn and unavoidable impurities, a bath temperature of 49% was used.
This is a Zn-Al alloy plating method in which plating is performed at 0 to 600 ° C. Al in the plating bath maintains the corrosion resistance of the plating layer, and Ni improves the adhesion between the plating layer and the object to be plated. , Preventing the occurrence of unplated portions, controlling and preventing excessive adhesion of the plating layer, keeping the surface of the object to be plated smooth, and helping to form a uniform plating layer. By performing plating in the above-mentioned bath temperature range in which both components are present, Zn-Al alloy plating is made possible by one plating process.
【００１３】[0013]
【実施例】次に、本発明の実施例を述べる。 実施例 １ 1) めっき浴の調製：ＪＩＳ Ｈ ２１０７の規定によ
る蒸留亜鉛一種地金、純度９９．９重量％のアルミニウ
ム地金及び純度９９重量％のニッケル地金を用いて、Ａ
ｌ５重量％、Ｎｉ０．０２重量％、残りＺｎ及び不可避
不純物からなる溶融亜鉛めっき浴を、３０番の黒鉛るつ
ぼ中で電気炉を用いて５７０℃にて溶製した。Next, an embodiment of the present invention will be described. Example 1 1) Preparation of plating bath: A single-layer metal of distilled zinc according to JIS H 2107, an aluminum metal having a purity of 99.9% by weight, and a nickel metal having a purity of 99% by weight were used.
A hot-dip galvanizing bath comprising 15% by weight, 0.02% by weight of Ni, the balance of Zn and unavoidable impurities was melted at 570 ° C. in a No. 30 graphite crucible using an electric furnace.
【００１４】2) 試料片の調製：板厚３ｍｍの一般構造
用圧延鋼板を使用して、板幅７５ｍｍ、板長１５０ｍｍ
の試料片を切り出し、その試料片の表面を、加熱した１
０重量％オルトケイ酸ナトリウム水溶液で脱脂した後、
１５重量％の硫酸溶液中に１０分間浸漬することによっ
て酸洗し、さらに４５重量％のＺｎＣｌ２・３ＮＨ４Ｃ
ｌ水溶液中に３分間浸漬して引き上げるフラックス処理
を施し、最後に、８０℃に保持された恒温槽中で乾燥し
て試料片を調製した。以下の実施例・比較例においても
同様に調製した試料片を使用した。2) Preparation of a sample piece: A rolled steel sheet for general structural use having a thickness of 3 mm is used, and its width is 75 mm and its length is 150 mm.
Was cut out, and the surface of the sample piece was heated to 1
After degreasing with a 0% by weight aqueous sodium orthosilicate solution,
Pickling by immersion in 15% by weight sulfuric acid solution for 10 minutes, followed by 45% by weight of ZnCl 2 .3NH 4 C
The sample was subjected to a flux treatment of dipping in an aqueous solution for 3 minutes and pulled up, and finally dried in a thermostat kept at 80 ° C. to prepare a sample piece. In the following Examples and Comparative Examples, similarly prepared sample pieces were used.
【００１５】3) めっき処理：１）で調製した溶融亜鉛
めっき浴を５１０℃に保ち、十分にめっき浴をかきまぜ
た後、めっき浴表面のドロスを除去し、２）のようにし
て調製した試料片を６０秒間めっき浴中に浸漬し、ふた
たびめっき浴表面のドロスを除去して前記試料片をめっ
き浴中から引き上げ、６０秒間空気中に保持した後、水
中に投入し、これを引き上げることによって、めっき層
を形成した試験片を得た。3) Plating treatment: The hot dip galvanizing bath prepared in 1) was kept at 510 ° C., and after sufficiently stirring the plating bath, dross on the surface of the plating bath was removed to prepare a sample prepared as in 2). The piece was immersed in the plating bath for 60 seconds, the dross on the surface of the plating bath was removed again, the sample piece was pulled out of the plating bath, kept in the air for 60 seconds, then put in water, and pulled up. Thus, a test piece on which a plating layer was formed was obtained.
【００１６】4) 諸試験：得られた試験片について、不
めっき部の発生の度合を観察して発生の有無を調べ、付
着量をめっき処理前後の重量変化から求め、かつ表面の
状態を目視により確認した。これらの結果を表１に示
す。 実施例 ２ めっき浴の浴温を５５０℃とした以外は、実施例１−1)
〜3)と同様に処理して試験片を調製し、実施例１−4)と
同様にして諸試験を行った。これらの結果を表１に示
す。 実施例 ３ めっき浴のＮｉ含有量を０．０４重量％とし、浴温を５
１０℃とした以外は、実施例１−1)〜3)と同様にして試
験片を調製し、実施例１−4)と同様にして諸試験を行っ
た。これらの結果を表１に示す。 実施例 ４ めっき浴のＮｉ含有量を０．０５重量％とし、浴温を５
１０℃とした以外は、実施例１と同様にして試験片を調
製し、実施例１−4)と同様にして諸試験を行った。これ
らの結果を表１に示す。 実施例 ５ めっき浴のＮｉ含有量を０．０５重量％とし、浴温を５
５０℃とした以外は、実施例１−1)〜3)と同様にして試
験片を調製し、実施例１−4)と同様にして諸試験を行っ
た。これらの結果を表１に示す。 実施例 ６ めっき浴のＡｌ含有量を７重量％とし、Ｎｉの含有量を
０．０５重量％とし、浴温を５５０℃とした以外は、実
施例１−1)〜3)と同様にして試験片を調製し、実施例１
−4)と同様にして諸試験を行った。これらの結果を表１
に示す。 実施例 ７ Ｎｉ含有量を０．０５重量％とし浴温を５８０℃とした
以外は、実施例１−1)〜3)と同様にして試験片を調製
し、実施例１−4)と同様にして諸試験を行った。これら
の結果を表１に示す。 実施例 ８ めっき浴のＮｉ含有量を０．０６重量％とした以外は、
実施例１−1)〜3)と同様にして試験片を調製し、実施例
１−4)と同様にして諸試験を行った。これらの結果を表
１に示す。 実施例 ９ めっき浴のＮｉ含有量を０．０６重量％とし、浴温を５
５０℃とした以外は、実施例１−1)〜3)と同様にして試
験片を調製し、実施例１−4)と同様にして諸試験を行っ
た。これらの結果を表１に示す。 実施例 １０ めっき浴のＮｉ含有量を０．０６重量％とし、浴温を５
８０℃とした以外は、実施例１−1)〜3)と同様にして試
験片を調製し、実施例１−4)と同様にして諸試験を行っ
た。これらの結果を表１に示す。 実施例 １１ めっき浴のＮｉ含有量を０．０８重量％とし、浴温を５
５０℃とした以外は、実施例１−1)〜3)と同様にして試
験片を調製し、実施例１−4)と同様にして諸試験を行っ
た。これらの結果を表１に示す。 実施例 １２ めっき浴のＮｉ含有量を０．０９重量％とし、浴温を５
８０℃とした以外は、実施例１−1)〜3)と同様にして試
験片を調製し、実施例１−4)と同様にして諸試験を行っ
た。これらの結果を表１に示す。 比較例 １ めっき浴のＮｉ含有量を０．１３重量％とした以外は、
実施例１−1)〜3)と同様にして試験片を調製し、実施例
１−4)と同様にして諸試験を行った。これらの結果を表
２に示す。 比較例 ２ めっき浴のＮｉ含有量を０．１０重量％とし、浴温を５
５０℃とした以外は、実施例１−1)〜3)と同様にして試
験片を調製し、実施例１−4)と同様にして諸試験を行っ
た。これらの結果を表２に示す。 比較例 ３ めっき浴のＮｉ含有量を０．１０重量％、浴温を５８０
℃とした以外は、実施例１−1)〜3)と同様にして試験片
を調製し、実施例１−4)と同様にして諸試験を行った。
これらの結果を表２に示す。 比較例 ４ めっき浴のＮｉ含有量を０．０８重量％とし、浴温を４
７０℃とした以外は、実施例１−1)〜3)と同様にして試
験片を調製し、実施例１−4)と同様にして諸試験を行っ
た。これらの結果を表２に示す。 比較例 ５ めっき浴のＮｉ含有量を０．０５重量％とし、浴温を４
５０℃とした以外は、実施例１−1)〜3)と同様にして試
験片を調製し、実施例１−4)と同様にして諸試験を行っ
た。これらの結果を表２に示す。 比較例 ６、７ めっき浴のＮｉ含有量を０．００５重量％とし、浴温を
５１０℃（比較例６）、５５０℃（比較例７）とした以
外は、実施例１−1)〜3)と同様にして試験片を調製し、
実施例１−4)と同様にして諸試験を行った。これらの結
果を表２に示す。 比較例 ８〜１０ めっき浴の調製に際しＮｉを添加せず、かつ浴温を４６
０℃（比較例８）、５５０℃（比較例９）、５８０℃
（比較例１０）とした以外は、実施例１−1)〜3)と同様
にして試験片を調製し、実施例１−4)と同様にして諸試
験を行った。これらの結果を表２に示す。4) Various tests: Observing the degree of occurrence of non-plated portions of the obtained test pieces to check for the occurrence, determining the amount of adhesion from the weight change before and after the plating treatment, and visually observing the surface condition. Confirmed by Table 1 shows the results. Example 2 Example 1-1) except that the bath temperature of the plating bath was 550 ° C.
Test pieces were prepared by treating in the same manner as in 3), and various tests were performed in the same manner as in Example 1-4). Table 1 shows the results. Example 3 The Ni content of the plating bath was 0.04% by weight, and the bath temperature was 5%.
Test pieces were prepared in the same manner as in Examples 1-1) to 3) except that the temperature was changed to 10 ° C, and various tests were performed in the same manner as in Example 1-4). Table 1 shows the results. Example 4 The Ni content of the plating bath was 0.05% by weight, and the bath temperature was 5%.
Test pieces were prepared in the same manner as in Example 1 except that the temperature was changed to 10 ° C., and various tests were performed in the same manner as in Example 1-4). Table 1 shows the results. Example 5 The Ni content of the plating bath was 0.05% by weight, and the bath temperature was 5%.
Test pieces were prepared in the same manner as in Examples 1-1) to 3) except that the temperature was changed to 50 ° C, and various tests were performed in the same manner as in Example 1-4). Table 1 shows the results. Example 6 In the same manner as in Examples 1-1) to 3), except that the Al content of the plating bath was 7% by weight, the Ni content was 0.05% by weight, and the bath temperature was 550 ° C. A test piece was prepared and prepared in Example 1.
Various tests were performed in the same manner as in -4). Table 1 shows these results.
Shown in Example 7 A test piece was prepared in the same manner as in Examples 1-1) to 3), except that the Ni content was 0.05% by weight and the bath temperature was 580 ° C, and the same as in Example 1-4). Various tests were conducted. Table 1 shows the results. Example 8 Except that the Ni content of the plating bath was 0.06% by weight,
Test pieces were prepared in the same manner as in Examples 1-1) to 3), and various tests were performed in the same manner as in Example 1-4). Table 1 shows the results. Example 9 The Ni content of the plating bath was 0.06% by weight, and the bath temperature was 5%.
Test pieces were prepared in the same manner as in Examples 1-1) to 3) except that the temperature was changed to 50 ° C, and various tests were performed in the same manner as in Example 1-4). Table 1 shows the results. Example 10 The Ni content of the plating bath was 0.06% by weight, and the bath temperature was 5%.
Test pieces were prepared in the same manner as in Examples 1-1) to 3) except that the temperature was changed to 80 ° C, and various tests were performed in the same manner as in Example 1-4). Table 1 shows the results. Example 11 The Ni content of the plating bath was 0.08% by weight, and the bath temperature was 5%.
Test pieces were prepared in the same manner as in Examples 1-1) to 3) except that the temperature was changed to 50 ° C, and various tests were performed in the same manner as in Example 1-4). Table 1 shows the results. Example 12 The Ni content of the plating bath was 0.09% by weight, and the bath temperature was 5%.
Test pieces were prepared in the same manner as in Examples 1-1) to 3) except that the temperature was changed to 80 ° C, and various tests were performed in the same manner as in Example 1-4). Table 1 shows the results. Comparative Example 1 Except that the Ni content of the plating bath was 0.13% by weight,
Test pieces were prepared in the same manner as in Examples 1-1) to 3), and various tests were performed in the same manner as in Example 1-4). Table 2 shows the results. Comparative Example 2 The Ni content of the plating bath was 0.10% by weight, and the bath temperature was 5%.
Test pieces were prepared in the same manner as in Examples 1-1) to 3) except that the temperature was changed to 50 ° C, and various tests were performed in the same manner as in Example 1-4). Table 2 shows the results. Comparative Example 3 The Ni content of the plating bath was 0.10% by weight and the bath temperature was 580.
Test pieces were prepared in the same manner as in Examples 1-1) to 3) except that the temperature was changed to ° C, and various tests were performed in the same manner as in Example 1-4).
Table 2 shows the results. Comparative Example 4 The Ni content of the plating bath was 0.08% by weight, and the bath temperature was 4%.
Test pieces were prepared in the same manner as in Examples 1-1) to 3) except that the temperature was changed to 70 ° C, and various tests were performed in the same manner as in Example 1-4). Table 2 shows the results. Comparative Example 5 The Ni content of the plating bath was 0.05% by weight, and the bath temperature was 4%.
Test pieces were prepared in the same manner as in Examples 1-1) to 3) except that the temperature was changed to 50 ° C, and various tests were performed in the same manner as in Example 1-4). Table 2 shows the results. Comparative Examples 6 and 7 Examples 1-1 to 3 except that the Ni content of the plating bath was 0.005% by weight and the bath temperature was 510 ° C. (Comparative Example 6) and 550 ° C. (Comparative Example 7). Prepare a test piece in the same manner as in
Various tests were performed in the same manner as in Example 1-4). Table 2 shows the results. Comparative Examples 8 to 10 In preparing the plating bath, Ni was not added, and the bath temperature was 46.
0 ° C (Comparative Example 8), 550 ° C (Comparative Example 9), 580 ° C
Except for (Comparative Example 10), test pieces were prepared in the same manner as in Examples 1-1) to 3), and various tests were performed in the same manner as in Example 1-4). Table 2 shows the results.
【００１７】[0017]
【表１】 [Table 1]
【００１８】[0018]
【表２】 [Table 2]
【００１９】表１及び表２において × 不めっき部の発生 あり ◎ 〃 なし これらの結果から、本発明によれば不めっき部の発生は
なく、かつ、付着量も３５０〜４４０ｇ／ｍ２の間によ
く制御され、過剰付着もなく、更に表面も平滑である。
これに対して、Ｎｉがなかったり不十分である場合や浴
温が低い場合には、めっき層の付着量が少な過ぎたり過
剰であったりして制御されず、又、不めっき部の発生が
あったり、表面にブツブツが発生するなどが認められ
た。In Tables 1 and 2, x: occurrence of non-plated portion Yes 〃 な し No From these results, according to the present invention, no non-plated portion occurred, and the amount of adhesion was between 350 and 440 g / m 2 . The surface is smooth and well-controlled.
On the other hand, when Ni is not present or insufficient, or when the bath temperature is low, the amount of deposition of the plating layer is too low or too high to be controlled, and unplated portions are not generated. It was observed that the surface was bumpy or the surface was bumpy.
【００２０】[0020]
【発明の効果】本発明は、Ａｌ３〜１０重量％添加して
なるＺｎ−Ａｌ合金めっき浴に特定量のＮｉを含有させ
たＺｎ−Ａｌ合金めっき浴を使用して、特定温度でめっ
き処理するめっき方法であるから、耐食性を維持するに
十分な膜厚を制御された状態で確保し得ると共に、被め
っき物の表面を平滑に保ち不めっき部の発生もない溶融
Ｚｎ−Ａｌ合金めっきを１回のめっき処理で得ることが
できるものであって顕著な効果が認められる。According to the present invention, a Zn-Al alloy plating bath containing 3 to 10% by weight of Al is used for plating at a specific temperature by using a Zn-Al alloy plating bath containing a specific amount of Ni. Since it is a plating method, it is possible to secure a sufficient film thickness to maintain the corrosion resistance in a controlled state, and to apply a hot-dip Zn-Al alloy plating to keep the surface of the object to be plated smooth and free of unplated portions. It can be obtained by multiple plating processes, and a remarkable effect is recognized.
Claims (1)
で０．１０重量％未満、残りＺｎ及び不可避不純物より
なるＺｎ−Ａｌ合金めっき浴を使用して浴温４９０〜６
００℃にてＺｎ−Ａｌ合金めっき処理することを特徴と
するＺｎ−Ａｌ合金めっき方法。1. A bath temperature of 490 to 6% by using a Zn-Al alloy plating bath comprising 3 to 10% by weight of Al, 0.01 to less than 0.10% by weight of Ni, and the balance of Zn and unavoidable impurities.
A Zn-Al alloy plating method, wherein a Zn-Al alloy plating treatment is performed at 00 ° C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6389391A JP2964678B2 (en) | 1991-03-05 | 1991-03-05 | Zn-Al alloy plating method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6389391A JP2964678B2 (en) | 1991-03-05 | 1991-03-05 | Zn-Al alloy plating method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04280952A JPH04280952A (en) | 1992-10-06 |
| JP2964678B2 true JP2964678B2 (en) | 1999-10-18 |
Family
ID=13242436
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6389391A Expired - Fee Related JP2964678B2 (en) | 1991-03-05 | 1991-03-05 | Zn-Al alloy plating method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2964678B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4050978B2 (en) * | 2002-11-27 | 2008-02-20 | 新日本製鐵株式会社 | High corrosion-resistant coated steel sheet with excellent sharpness |
| JP5886114B2 (en) * | 2012-04-18 | 2016-03-16 | 株式会社デンロコーポレーション | Zn-Al alloy plating method |
| JP5961433B2 (en) * | 2012-04-18 | 2016-08-02 | 株式会社竹中工務店 | Method for producing Zn-Al alloy plated reinforcing bar |
-
1991
- 1991-03-05 JP JP6389391A patent/JP2964678B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04280952A (en) | 1992-10-06 |
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