JP2003306781A5

JP2003306781A5 -

Info

Publication number: JP2003306781A5
Application number: JP2002116026A
Authority: JP
Filing date: 2002-04-18
Publication date: 2005-06-30
Anticipated expiration: 2022-04-18

Description

第二発明は、第一発明において、前記pH緩衝作用を有する酸性溶液として、酢酸塩、フタル酸塩、クエン酸塩、コハク酸塩、乳酸塩、酒石酸塩、ホウ酸塩、リン酸塩のうち、少なくとも1種類以上を含有し、溶液のpHが1.0〜5.0の範囲にある酸性溶液を用いることを特徴とする合金化溶融亜鉛めっき鋼板の製造方法を提供する。
第三発明は、第一発明において、前記pH緩衝作用を有する酸性溶液として、酢酸塩、フタル酸塩、クエン酸塩、コハク酸塩、乳酸塩、酒石酸塩、ホウ酸塩、リン酸塩のうち、少なくとも1種類以上を、前記各成分の含有量を5〜50g/lの範囲で含有し、溶液のpHが1〜5の範囲にある酸性溶液を用いることを特徴とする合金化溶融亜鉛めっき鋼板の製造方法を提供する。
In the second invention, among the acid salts, phthalates, citrates, succinates, lactates, tartrates, borates and phosphates as the acidic solution having the pH buffering action in the first invention. Provided is a method for producing an alloyed hot-dip zinc-plated steel sheet, which comprises using an acidic solution containing at least one kind and having a solution pH in the range of 1.0 to 5.0.
According to the third invention, among the acid salts, phthalates, citrates, succinates, lactates, tartrates, borates and phosphates, as the acidic solution having a pH buffering action in the first invention . , At least one of the above-mentioned components is contained in the range of 5 to 50 g / l, and an acidic solution having a solution pH in the range of 1 to 5 is used. Provided is a method for manufacturing a steel plate.

第七発明は、鋼板に溶融亜鉛めっきを施し、さらに加熱処理により合金化し、調質圧延を施した後、酸性溶液と接触させて、めっき表面に酸化物層を形成するに際し、前記酸性溶液として、pH緩衝作用を有する酸性溶液を用いるとともに、酸性溶液に接触後1〜30秒保持した後水洗する合金化溶融亜鉛めっき鋼板の製造方法により生産される、平坦部表層に厚さ10nm以上の酸化物層を有することを特徴とする合金化溶融亜鉛めっき鋼板を提供する。
第八発明は、第七発明において、前記pH緩衝作用を有する酸性溶液として、酢酸塩、フタル酸塩、クエン酸塩、コハク酸塩、乳酸塩、酒石酸塩、ホウ酸塩、リン酸塩のうち、少なくとも1種類以上を含有し、溶液のpHが1.0〜5.0の範囲にある酸性溶液を用いることを特徴とする合金化溶融亜鉛めっき鋼板を提供する。
第九発明は、第七発明において、前記pH緩衝作用を有する酸性溶液として、酢酸塩、フタル酸塩、クエン酸塩、コハク酸塩、乳酸塩、酒石酸塩、ホウ酸塩、リン酸塩のうち、少なくとも1種類以上を、前記各成分の含有量を5〜50g/lの範囲で含有し、溶液のpHが1〜5の範囲にある酸性溶液を用いることを特徴とする合金化溶融亜鉛めっき鋼板を提供する。
In the seventh invention, a steel plate is subjected to hot-dip zinc plating, further alloyed by heat treatment, tempered and rolled, and then brought into contact with an acidic solution to form an oxide layer on the plated surface, as the acidic solution. Oxidation with a thickness of 10 nm or more on the surface layer of the flat part produced by the manufacturing method of alloyed hot-dip zinc-plated steel plate, which uses an acidic solution having a pH buffering action, holds it in contact with the acidic solution for 1 to 30 seconds, and then rinses it with water. Provided is an alloyed hot-dip zinc-plated steel plate having a physical layer.
The eighth invention, in the seventh invention, includes acetate, phthalate, citrate, succinate, lactate, tartrate, borate, and phosphate as the acidic solution having the pH buffering action. Provided are an alloyed hot-dip zinc-plated steel sheet containing at least one kind and using an acidic solution in which the pH of the solution is in the range of 1.0 to 5.0.
In the ninth invention, among the acid salts, phthalates, citrates, succinates, lactates, tartrates, borates, and phosphates, as the acidic solution having the pH buffering action in the seventh invention . , At least one of the above-mentioned components is contained in the range of 5 to 50 g / l, and an acidic solution having a solution pH in the range of 1 to 5 is used. Provide steel plate.

(実施例2)
実施例1と同様の手法で、合金化溶融亜鉛めっき鋼板表面に酸化物層を形成させる処理を行った。なお、酸性溶液槽2で浸漬処理を行う溶液（温度50℃、pH2.0）としては、酢酸ナトリウム、フタル酸水素カリウム、クエン酸ナトリウム、コハク酸ナトリウム、乳酸ナトリウム、酒石酸ナトリウム、ホウ酸、リン酸水素二ナトリウムをそれぞれ含有する水溶液を作製し、適宜、濃度を変化させた。また、溶液のpHは硫酸を添加することで調整した。
(Example 2 )
An oxide layer was formed on the surface of the alloyed hot-dip galvanized steel sheet by the same method as in Example 1. The solutions (temperature 50 ° C., pH 2.0) to be immersed in the acidic solution tank 2 include sodium acetate, potassium hydrogen phthalate, sodium citrate, sodium succinate, sodium lactate, sodium tartrate, boric acid, and phosphorus. An aqueous solution containing disodium hydrogen acid was prepared, and the concentration was appropriately changed. The pH of the solution was adjusted by adding sulfuric acid.

次に、以上の様に作製した鋼板について、実施例1と同様に、めっき皮膜中のFe濃度、及び摩擦係数の測定ならびに、屋外放置後の点錆の発生の有無を調査した。
試験結果を表2および3に示す。
Next, with respect to the steel sheet produced as described above, the Fe concentration and the friction coefficient in the plating film were measured and the presence or absence of rust spots after being left outdoors was investigated in the same manner as in Example 1.
The test results are shown in Tables 2 and 3 .

表2および3に示す試験結果から下記事項が明らかである。
(1)No.1および2は酸性溶液による処理を行っていないため、摩擦係数が高い。
(2)No.8およびNo.13は、水洗までの保持時間が本発明範囲内からはずれる比較例であり、pH緩衝作用を有する酸性溶液による処理を行ったものであるため、No.1およびNo.2と比較すると、摩擦係数が低くなるものの低下が不十分である。
(2)No.3〜No.7は、pH緩衝作用を有する酸性溶液による処理を行い、しかも水洗までの保持時間が本発明で規定した範囲内にあるため、No.1、2、8、13の比較例より、摩擦係数が低くなっている。
(4)No.9〜12およびNo.14〜17は、本発明で規定する濃度の酸性溶液による処理を行い、水洗までの保持時間も本発明範囲内にあり、No.3〜7、8および13と比較すると、摩擦係数が低く、特に条件2の摩擦係数で低下が顕著である。さらに液膜量を3.0g/m2以下としたNo.14〜17では、条件2の摩擦係数がより低下した。
(5)No.18〜49は、酸性溶液による処理を行う前に、活性化槽でアルカリ処理を行った例であり、条件2の摩擦係数が低下する効果が得られた。また、中和槽を使用した結果、点錆の発生もなく、酸化物層を形成した鋼板コイルが使用前に長期保管されることがあっても錆発生を防止する能力に優れている。 The following items are clear from the test results shown in Tables 2 and 3 .
(1) No. 1 and 2 have a high coefficient of friction because they are not treated with an acidic solution.
(2) No. 8 and No. 13 are comparative examples in which the retention time until washing with water is out of the range of the present invention, and are treated with an acidic solution having a pH buffering action. Compared to No. 2, the coefficient of friction is lower, but the decrease is insufficient.
(2) Nos. 3 to 7 are treated with an acidic solution having a pH buffering action, and the retention time until washing with water is within the range specified in the present invention. The coefficient of friction is lower than that of the 13 comparative examples.
(4) Nos. 9 to 12 and Nos. 14 to 17 are treated with an acidic solution having a concentration specified in the present invention, and the holding time until washing with water is also within the range of the present invention, and Nos. 3 to 7 and 8 Compared with and 13, the coefficient of friction is lower, and the decrease is particularly remarkable in the coefficient of friction under condition 2. Furthermore, in Nos. 14 to 17 where the liquid film amount was 3.0 g / m2 or less, the friction coefficient under Condition 2 was further reduced.
(5) Nos. 18 to 49 are examples of alkali treatment in an activation tank before treatment with an acidic solution, and the effect of reducing the friction coefficient under condition 2 was obtained. Further, as a result of using the neutralization tank, no rust is generated, and the steel plate coil having the oxide layer formed is excellent in the ability to prevent rust even if it is stored for a long time before use.

Claims

The method for producing an alloyed hot-dip galvanized steel sheet according to claim 1, wherein the steel sheet is subjected to hot dip galvanization, further alloyed by heat treatment, subjected to temper rolling and then brought into contact with an acidic solution to form an oxide layer on the plating surface, A method of producing an alloyed galvanized steel sheet characterized in that an acidic solution having a pH buffering action is used as the acidic solution, and after being held in contact with the acidic solution, held for 1 to 30 seconds and then washed with water.

Said pH At least at least one of acetate, phthalate, citrate, succinate, lactate, tartrate, borate and phosphate as an acidic solution having a buffering action 1 Containing more than one kind of solution pH But 1.0 ~ 5.0 The manufacturing method of the alloying hot-dip galvanized steel sheet according to claim 1, wherein an acidic solution in the range of

At least one or more of an acetate, a phthalate, a citrate, a succinate, a lactate, a tartrate, a borate, and a phosphate as the acidic solution having a pH buffering action, and each component The method for producing an alloyed galvanized steel sheet according to claim 1 , characterized in that an acidic solution containing 5 to 50 g / l of solution and having a solution pH of 1 to 5 is used. .

The method for producing an alloyed galvanized steel sheet according to any one of claims 1 to 3, wherein the surface is activated by contacting with an alkaline solution before contacting with an acidic solution.

The alloyed galvanized steel sheet according to any one of claims 1 to 4, wherein after being brought into contact with the acid solution, the acid solution left in contact with the alkaline solution is subjected to neutralization treatment of the acid solution remaining on the surface. Production method.

The method for producing an alloyed galvanized steel sheet according to any one of claims 1 to 5, wherein the solution film formed on the surface of the steel sheet after contacting with the acidic solution is 3 g / m2 or less.

The steel sheet is subjected to hot dip galvanizing, heat alloyed by heat treatment, temper rolling, and then brought into contact with an acidic solution to form an oxide layer on the plating surface. An oxide layer with a thickness of 10 nm or more is produced on the surface layer of the flat part produced by the method for producing an galvanized steel sheet produced by using an acidic solution and holding it for 1 to 30 seconds after contact with an acidic solution and then washing with water. Alloyed hot-dip galvanized steel sheet characterized by

Said pH At least at least one of acetate, phthalate, citrate, succinate, lactate, tartrate, borate and phosphate as an acidic solution having a buffering action 1 Containing more than one kind of solution pH But 1.0 ~ 5.0 The galvannealed steel sheet according to claim 7, wherein an acidic solution in the range of

At least one or more of an acetate, a phthalate, a citrate, a succinate, a lactate, a tartrate, a borate, and a phosphate as the acidic solution having a pH buffering action, and each component The galvannealed steel sheet according to claim 7, which contains an acid solution having a content of 5 to 50 g / l and a solution pH of 1 to 5.

The alloyed galvanized steel sheet according to any one of claims 7 to 9, wherein the surface is activated by contacting with an alkaline solution before contacting the acidic solution.

The alloyed hot-dip galvanized steel sheet according to any one of claims 7 to 10, characterized in that after being brought into contact with the acid solution, it is brought into contact with the alkali solution to neutralize the acid solution remaining on the surface.

The alloyed hot-dip galvanized steel sheet according to any one of claims 7 to 11, wherein a solution film formed on the surface of the steel sheet after contacting with the acidic solution is 3 g / m2 or less.