KR102074773B1 - Fe-X Flash Electronic Plating Solution, Method for Manufacturing the Galvanized Steel Sheet and Galvanized Steel Sheet Thereof - Google Patents

Abstract

The present invention relates to the manufacture of a hot dip galvanized steel sheet used for a vehicle and home appliances and, specifically, to an Fe-X flash electroplating solution used for Fe flash plating in Fe flash electroplating performed on a substrate steel sheet by a pretreatment process of hot dip galvanizing to prevent the generation of a part which is not plated and improve adhesion of a hot dip galvanized film. The present invention also relates to a manufacturing method for a hot dip galvanized steel sheet using a Fe-X flash electroplating solution and hot dip galvanized steel sheet manufactured by the same. According to the present invention, the Fe-X flash electroplating solution for hot dip galvanized undercoat adds tungsten and/or titanium metal ions, an antioxidant, an Fe stress reducer, a potential difference enhancer, and a complexing agent to an acid plating solution in which the concentration of Fe ions is 3-300g/l. Also, additives are composed of 0.01-5 g of the tungsten and/or titanium metal ions, 0.1-100 g of the antioxidant, 0.1-30 g of the Fe stress reducer, 0.5-30 g of the potential difference enhancer, and 0.1-100 g of the complexing agent in comparison with 100 g of the concentration of the Fe ions.

Description

Fe-X flash electroplating solution and method for manufacturing hot-dip galvanized steel sheet using the same and hot-dip galvanized steel sheet manufactured by the method {Fe-X Flash Electronic Plating Solution, Method for Manufacturing the Galvanized Steel Sheet and Galvanized Steel Sheet Thereof}

The present invention relates to the production of hot-dip galvanized steel sheet used in automobiles, home appliances, and the like, in detail, carried out on the base steel sheet in the pre-treatment process of hot-dip galvanized to improve the adhesion of the hot-dip galvanized film and to prevent unplated. In the Fe flash electroplating, the Fe-X flash plating solution and Fe-X flash plating solution used for Fe flash plating, and a method for producing a hot-dip galvanized steel sheet using the Fe-X flash plating solution, and a hot-dip galvanized steel sheet will be.

A plated film is formed to improve corrosion resistance or surface decoration of the steel sheet. There are various materials forming the plating film, but zinc plating and its alloying material are mainly used for securing corrosion resistance. Galvanizing extends the life of iron sheet by sacrificial method when the base metal is steel sheet. In case of extending the service life by plating corrosion resistant material on plate or decorating, there should be no adhesion and uniform plating of plating material. In addition, the surface should be uniform and the appearance should be good. In particular, the steel sheet used in automobiles and home appliances is increasing the demand for high strength, high tensile strength steel sheet to improve the tensile strength, yield strength, etc. in order to reduce the weight. These steel sheets are difficult to form due to the increase in strength, and in particular, the stretching of the steel materials is lowered. Therefore, for steels with high strength and elongation, add Si, Mn, Al, etc. to the steel plate and develop various structures to make DP steel (Dual Phase: Ferrite and Martensite Phase), Trip Steel (Transformation Induced Plasticity), CP Steel (Complex Phase). It is produced in steel sheet types such as: Ferrite, Martensite and Precipite Phase. However, in order to improve the corrosion resistance of these steels, hot dip galvanizing is performed. These hot dip galvanizing procedures include a degreasing process for removing oil components from the rolled steel plate with base metal, a pickling process if necessary, an annealing process at an appropriate temperature, cooling and an appropriate temperature. Hot-dip plating materials are produced by hot-dip plating, cooling and, if necessary, surface finishing. In general carbon steel sheet, dew point, which is hard to cause iron oxide on the surface, is managed in the annealing process, so that zinc zinc alloy hot dip galvanized on the surface occurs. However, Si Mn, Al, etc. added to produce the high strength or high strength steel sheet mentioned above are oxidized with elements such as Si, Mn, Al, etc. distributed on the surface of the steel sheet by reacting with a small amount of oxygen or moisture present during annealing. Oxides or composite oxides are generated to interfere with the wettability of the molten metal, resulting in a decrease in adhesion of the plated film or unplating, resulting in poor surface quality.

In order to solve this defect, as a method of covering the base layer before plating, Japanese Patent 2002-322551,2003-183797,2005-119466, 2005-200690, 2006-283070, 2769350, 2007-262464, Korean Patent 10-0884104, 10 -1040770, 10-214-0123921, etc., a flash plating method has been introduced to lead and process elements such as Ni, Fe, Co, C, S, C, Cu on the surface of the steel sheet. However, in the above-described method, it is difficult to adjust the reducing atmosphere to unusual conditions during annealing when it is not the method of Fe plating, or it is difficult to adjust the dew point, resulting in poor adhesion or almost no effect. In combination with the elements mentioned above, Fe ions are oxidized and sludgeized in the plating solution, which makes it impossible to use them for a long time. Ni and Co are allergen-induced heavy metals and are expensive. In addition, even when the lead is made by these metals, it is difficult to obtain a good plating quality by peeling the plating layer when processing occurs due to insufficient adhesion due to an oxide layer preferentially generated by Si, Mn, Al, etc. generated during annealing.

In addition, Korean Patent No. 10-0976787 discloses an electrogalvanized steel sheet in which an iron plating solution as a base plating solution for manufacturing an electrogalvanized steel sheet and a railway gold solution are plated with a base plating solution, and a manufacturing method thereof.

This technique has been developed by the inventors and the like, and can be used for a long time, and also improves the coating film characteristics of the galvanized steel sheet, and has excellent corrosion resistance, adhesiveness and hiding property.

However, this technique has an excellent effect on the galvanized steel sheet, but has a problem that is difficult to apply to hot-dip galvanized steel sheet.

The reason for this is that, as mentioned above, as in the case of pure Fe plating, by the leading surface of the final layer of the base layer, the adhesion between the base layer and the base metal due to the preferential oxides such as Si, Mn, and Al generated during annealing It is difficult to produce a good plating material inadequately.

The present invention was derived to solve the above problems, to provide a Fe-X flash plating solution for producing a hot-dip galvanized steel sheet with excellent plating adhesion and surface appearance, to prepare a hot-dip galvanized steel sheet using this solution It is an object of the present invention to provide a hot-dip galvanized steel sheet manufactured by the method and the manufacturing method thereof.

The present inventors have studied to prevent plating adhesion and unplating, and when one or two or more kinds of Si, Al, Mn, and the like are contained, they are effective in securing strength and stabilizing ductile austenite or generating residual austenite. In the case of more than 1.0%, most of the hot-dip galvanizing is poor, so the above problem is solved by performing an appropriate amount of Fe-X lead gold (flash plating) before hot dip plating. Here, the Fe-X lead metal is Fe, W, Ti metal is deposited on the surface of the steel sheet is plated, it means that X is included in W or Ti alone or in the form of W + Ti.

In order to achieve the above object, the present invention has developed Fe-X plating as a leading gold, the oxides of Si, Mn, Al, etc. that could not be solved in the solution proposed in the preceding leading gold did not secure adhesion with the leading gold layer Adhesiveness is ensured by X metal mixed with Fe, and the oxide is completely masked.

Tungsten and / or titanium metal ions, antioxidants, Fe stress reducers, potentiometers, and complexing agents are added to an acidic plating solution having a concentration of 3 to 300 g / l of Fe ions, and the additives are added to a concentration of 100 g of Fe ions. In preparation,

0.01 to 5 g of tungsten and / or titanium metal ions, 0.1 to 100 g of antioxidant,

Fe stress reducing agent is 0.1 ~ 30g, improves the potential difference between Fe, tungsten and titanium metal to make a good plating layer. Potential difference improving agent is 0.5 ~ 30g and complexing agent is 0.1 ~ 100g. Provide a solution.

The Fe is a salt selected from ferrous sulfate, ferrous chloride, ferrous boride, iron sulfonate,

The tungsten and / or titanium is characterized in that the salt is tungsten sodium, potassium titanium oxalatena,

The antioxidant is characterized in that at least any one of benzoic acid, ethylene diamine + citric acid-based organic material, amino acetic acid, bezelsulfonate, 4-oxo-pentanoic acid, ascorbic acid,

The stress reducing agent includes at least any of saccharin, tridecyloxy poly (ethyleneoxy) ethanol (3), diisodecylphthalate N- (3-hydroxybutyllemen-P-sulfanic acid, polyalkylene polyamine, and malonic acid Characterized by one,

The potentiometer is characterized in that at least one of ethylene glycol, polyethylene glycol, polyamine, ethylene diamine, 2-butene-1, 4-diol,

The plating ion complexing agent may be at least one of ethylene, amino acetic acid, benzenesulfonate, gluconic acid, and 4-oxo-pentanoic acid.

In addition, the present invention

Preparing a steel sheet containing at least one of Si: 0.2 to 6.0%, Mn: 0.2 to 7.0%, and Al: 0.2 to 7.0% by weight,

Fe-X flash electroplating (Fe-X lead plating) for depositing at least one metal selected from Fe metal and tungsten and / or titanium on the base steel sheet,

It provides a method for producing a hot-dip galvanized steel sheet comprising the step of heat oxidation, maintenance, cooling, hot-dip galvanizing of zinc or zinc alloy on the Fe-X flash electroplated steel sheet, and post-treatment if necessary. .

Fe-X flash electroplating on the base steel sheet is one or more of tungsten or titanium, antioxidants, Fe stress reducers, potentiometric inhibitors, complexing agents, etc. in an acid plating solution with a Fe ion concentration of 3 ~ 300g / l. It is carried out in the Fe-X flash plating solution added, the additive is compared to the concentration of Fe ions 100g, the concentration of one or more ions of tungsten or titanium: 0.01 ~ 5g, antioxidant: 0.1 ~ 100g, Fe stress reduction Agent: 0.1-30 g, potentiometric inhibitors: 0.5-30 g, complexing agents: 0.1-100 g is added and comprised.

The Fe-X flash electroplating is characterized in that the plating is performed under the conditions of the plating current density of 1 ~ 150ASD, the plating solution temperature is 20 ~ 85oC, pH is 1.0 ~ 6.5,

The plating amount of the Fe-X plating layer is characterized in that 0.1 ~ 5.0g / m2.

In addition, the present invention

A plated layer of Fe-X metal is formed on the base steel sheet, and a hot dip galvanized steel sheet having a hot-dip galvanized layer of zinc or zinc alloy is formed on the Fe-X plated layer.

The plating amount of the Fe-X plating layer is characterized in that 0.1 ~ 5.0g / m2.

According to the present invention, a hot-dip galvanized steel sheet having a good surface adhesion and no unplated surface is continuously formed on a high-strength steel or a high-strength steel sheet containing one or two or more kinds of Si, Al, and Mn, which are difficult to be hot-dipped. It is possible to manufacture.

1 is a surface of a steel sheet hot-dip galvanized without lead in a high-strength steel sheet containing 4.1 wt% of the sum of Si, Al, and Mn
2 is a surface of a steel sheet hot-dip galvanized with 2 g / m2 of Fe-X flash plating on the same base steel sheet as in FIG.

The present invention includes a process for performing hot-dip plating in a general manner, and includes a process for leading the Fe-X plating based on Fe as the lead. The Fe-X lead is generally made of electroplating, and the process is made of a plated steel sheet containing rolled Si, Mn, Al, etc. and plated by electroplating. Difficulties in production allow X to be plated simultaneously with Fe. Here, the Fe-X plating bath is an acid bath using ferrous iron. These structures mainly consist of ferrous sulfate, ferrous chloride, ferrous boride, ferric sulfone and the like, and mixtures thereof. However, in these plating baths, ferrous ions become ferric iron and ultimately become sludge in the plating process, making continuous plating difficult.

 Therefore, in this plating solution, it is necessary to prevent the production of ferric iron.

In addition, the present invention prevents unplating by covering oxides or composites such as Si, Mn, Al, etc., which appear in pure Fe plating of a plating solution, but in the case of oxidative heating, it is possible to secure adhesion between these oxides and the Fe-X plated layer so that base metals and wires The adhesion of the plating layer and the adhesion of the lead metal layer and the hot dip coating film should be ensured.

In order to achieve the above two objects, the Fe-X flash plating solution of the present invention is provided. Plating solution is 0.1 ~ 100g of antioxidant to prevent oxidation of iron ions based on Fe concentration of 100g (hereinafter referred to as 100g of Fe ion) in plating solution with Fe ion concentration of 3 ~ 300g / L. , 0.1 to 30 g of Fe stress reducing agent, 0.05 to 30 g of potential difference improving agent which improves the potential difference between Fe metal and X metal to make a good plating layer. Or 0.01 to 5.0 g of Ti is added to constitute a plating solution. In addition, a conductive salt may be used to secure conductivity.

These are according to the general electroplating theory, the plating current density is 1 ~ 150ASD, the plating solution temperature is room temperature ~ 85oC, the pH is made at 1.0 ~ 5.5, the plating amount is formed to 0.1 ~ 5g / m2.

The present invention will be described in detail below.

In the Fe-X plating solution of the present invention, the ferrous metal is supplied in the form of salts, which are sulfuric acid, chloride, ammonium, It can be used as such. The concentration of Fe may be used in the range of 3 to 300 g / L, preferably 50 to 200 g / L. If the iron concentration is more than 300g / L, salt dissolution is not desired and plating adhesion is reduced and uniform plating is difficult.If the concentration is less than 3g / L, the ion concentration is low and the current is increased to generate a ballistic plating due to hydrogen generation. A defect occurs in the fitting or the like.

As the X element, Ti or W metal is added to the plating solution, or one or two or more kinds thereof are added, and the content appears in the precipitation plating layer. The X component in the plating solution is 0.01 to 5 g / L compared to 100 g of Fe. At 0.01g / L or less, Si, Mn, Al, etc. exposed on the metal surface of the molten plated material do not prevent the formation of an oxide film during oxidative heating, thereby reducing the adhesion with the lead gold Fe plating layer. It is difficult to improve the adhesion due to poor alloying properties of the X metal and the poor plating property.

In plating where iron ions are the main component, iron ions are oxidized to change from divalent to trivalent, which is generally developed into oxidized sludge. Therefore, continuous plating cannot be performed unless such oxidation of iron ions is prevented. The inventors have added benzoic acid, ethylene diamine + citric acid organics, aminoacetic acid, bezelsulfonate, 4-oxo-pentanoic acid, ascorroic acid and mixtures thereof with iron ion antioxidants to eliminate these defects. When the iron component is 100g to 1L of these plating solutions, 0.1 to 100g may be added to exhibit the ability, but preferably 1 to 50g is good. At 0.1g / L or less, the concentration of antioxidant is low to prevent the oxidation of Fe. If it is more than 100g, the oxidation is good, but the surface of the plating layer cracks due to the increase of stress during plating, and the stability of the liquid is also not good. Can not do it.

In addition, when Fe-X plating is performed, stress may be concentrated in the plating layer, resulting in poor cracking or adhesiveness, and thus a stress reducing agent is required, and an additive for lowering the potential difference between Fe and X plating materials is required. Strainers include saccharin, tridecyloxy poly (ethyleneoxy) ethanol (3), diisodecylphthalate N- (3-hydroxybutyllemen-P-sulfanic acid, polyalkylene polyamines, malonic acid or mixtures thereof It should not exceed 0.1-30g for 100g of iron, but preferably 2-10g is good, and it is not effective at 0.1g or less for reducing stress, and in the case of adding more than 30g, the conduction efficiency is excessive due to the excessive amount of organic matter in the plating solution. Falling, high current impedes ion transfer, resulting in non-uniform plating, but rather stress-induced cracking.

Ethylene glycol, polyethylene glycol, polyamine, ethylene diamine, 2-butene-1, 4-diol and the like are preferable as the potential difference improving agent so that the potential difference between the Fe ion and the X ion can be made similar, so that a good lead can be obtained. They use 0.05 to 30 g based on 100 g / L of iron used, preferably 1 to 10 g is good. If it is 0.05g or less, it is ineffective in a small amount, and in the case of 30g or more, it is difficult to supply ions by excessive use, preventing uniform plating and reducing adhesiveness.

In addition, a plating ion complexing agent, such as ethylene, amino acetic acid, benzenesulfonate, gluconic acid, and 4-oxo-pentanoic acid, or a mixture thereof, may be used to increase the plating efficiency to improve surface defects and adhesion. These concentrations show an effect at 0.1 to 100 g with respect to the concentration of iron ions at 100 g, preferably 5 to 50 g. At 0.1 g or less, there is almost no influence of the plating reaction. On the other hand, at 100 g or more, the adhesion of the plated layer is not good, and ballistic plating also appears.

Conductive aids are used to maintain the conductivity of the solution, which may be used as sulfate salts, ammonium salts, boric acid salts, and fluoride salts. For example, ammonium sulfate, ammonium chloride, borax and boric acid salts, ammonium phosphate, potassium sulfate, potassium chloride, sodium chloride, ammonium fluoride, potassium hydroxide and the like, or mixtures thereof can be used. They should be well dissolved in the plating solution, and in manufacture, they can be dissolved in the plating solution or separately dissolved in water.

Even if the plating operation of Fe-X plating is performed for a long time using the above-described plating solution, the plating solution does not age and is prevented from sludge, thus allowing continuous operation. In addition, it obtains a good plating layer and obtains the desired lead metal layer, which leads to the hot-dip galvanized steel sheet. Therefore, Si, Mn, Al, etc. are included. When the hot-dip steel sheet is hot-dipped (GI, GA, etc.), the plating is secured. Present the conditions.

The acidity of the plating liquid is preferably (pH) 1.0 to 6.5. Below 1.0, the amount of Fe precipitates is extremely small, plating is difficult, and above 6.5, the color changes on the surface, and the plating becomes uneven when used for a long time.

The temperature of the plating liquid can be from 20oC to 85oC, the efficiency of the plating layer is not good at 20 degrees or less, the adhesion is reduced, and the surface is uneven and the X plating component is difficult to precipitate at more than 85 degrees.

The current density should be between 1 and 150 ASD, but below 1.0 ASD, coarsening of particles occurs, adhesion is reduced, and efficiency is reduced, but above 150 ASD, deposition of X metal is difficult and uneven plating is caused by the difference in plating thickness at the edges. Is done.

Hereinafter, the embodiment of the present invention will be more specific.

When molten plating is undesired due to oxides such as Si, A, Mn, etc. added to give strength and tensile strength to the base metal, these oxides are covered and melt plated as described above. When iron-based plating solution is used, iron oxides are sludged due to natural phenomenon due to long-term use, which makes it difficult to continuously plate for long periods of time. Even if plating is performed, the lead gold coating and base metals are diffused due to diffusion movement and expression of these oxides in the annealing process after plating. Inferior adhesion of the liver occurs.

Therefore, the present inventors have invented a Fe-based plating solution capable of continuous productivity without sludge generation in order to solve the above defects, and solved the problem of making it difficult to melt plating during annealing by covering the surface, and because of the addition of X inorganic A technology was developed to produce a good molten plating material by preventing diffusion and migration of oxide elements that are difficult to plate during annealing.

In the present invention, an oxide is generated by elements such as Si, Al, Mn, etc. contained in the base metal through the embodiment to provide an example of the invention that the hot dip coating (including alloying plating) overcomes difficulties.

The base steel sheet contains one kind or two or more kinds of components such as Si, Al, and Mn, and when each component is 0.2 wt% or less, the amount of oxide is small on the surface during annealing, so it is difficult to see the utility of the invention and the sum is 0.5. The cases of more than% were selected, and in these cases, the practicality of fabrication of the steel sheet was decreased in each of the 7.0% directors, so the sum of Si, Al, and Mn was selected from 0.5% to 7.0%. However, even if the embodiment of the steel sheet selected them, the present invention is applicable even if the sum is low or high.

The total amount of carbon C is 0.3% by weight or less, and P, S, N, B, V, Cr, Co, and Ni are used for the purpose of other qualities of steel, that is, strength, ductility, toughness, bending strength, and hole expandability. What is necessary is just the steel plate containing the impurity which must inevitably enter, including Cu, Mo, Sb, Ti, Nb, etc. The steel prepared above is hot-rolled, cold-rolled and annealed, and subjected to Fe-X lead gold through a degreasing process to the cooled and rolled steel sheet.

Fe-X plating liquid was used as a solution which forms a lead gold layer. At this time, the plating amount was limited to 0.1 g / m 2 to 5 g / m 2, but it is possible to have an abnormality without cost problems. However, the effect is less than 0.1g / m2 or less

Example 1

A strip steel having a thickness of 1.2 mm and containing 1.8% by weight of Si, 0.3% by weight of Al, and 2.0% by weight of Mn was used as the base steel sheet, and plating was performed using the plating conditions shown in Table 1 through a degreasing step.

As the plating solution, Fe used iron sulfate-based iron, and sodium tungstate was added thereto to form a Fe-X-ray plating layer. Ammonium sulphate was used to improve conductivity, amino acetic acid for oxidization prevention and long life, saccharin for stress reduction, ethylene glycol to improve potential difference between ions, and gluconic acid for diffusion of base metals. Was used.

The hot-dip steel plate was generally used to perform hot dip plating. That is, the leaded steel sheet was heated to 760oC after washing with water and cooled to the plating bath temperature to be hot-dipped to adjust the deposition amount to 50g / m2.

Table 1 shows the electroplating conditions of these lead metals. The plating amount of the steel sheet was controlled by the plating time and the input current. Plating amount was analyzed by ICP (Inductive Coupled Plasma) using a Cu plate under the same conditions. The melt-plated plate was bent at V angle so that the cabinet angle was 30 degrees, and the adhesiveness was determined in the peeling state by the tape test.

The case where there was no peeling was made excellent, and when peeling appeared, it was made defective. In addition, when even one unplated surface was found by visual inspection, it was judged to be defective and to be satisfactory.

The lead in the following is not mentioned, the concentration of Fe 100g / L, compared with Fe 100 X material 0.5g / L, antioxidant 10 g / L stress reducing agent 5g / L, potentiometric improver 3g / L, plating complexing agent 10g / L, 50g / L of the conduction aid were melted and plated.

In addition, the lead gold was plated under the conditions of current density 60ASD, pH 3.0, plating bath temperature 60oC, and plating amount 2g / m2.

 Table 1 Quality Impact by Leading Payment Terms

In Table 1, all of the results of the present invention showed good results.

Example 2

Table 2 below shows examples for antioxidants, stress reducers, potentiometers, plating complexing agents, and the like. The sludge of the plating liquid was evaluated as turbidity. The turbidity appeared after 48 hours of continuous plating. The turbidity increase over the initial turbidity was 20 NTU or more, and the lower was good. .

 Table 2 Quality Impact by Leading Additives

As shown in the above table, the invention showed good quality.

Claims (12)

Regarding the concentration of Fe ions in 100 g of acid plating solution having a concentration of Fe ions of 3 to 300 g / l,
Tungsten and / or titanium metal ions: 0.01 to 5 g, antioxidant: 0.1 to 100 g, Fe stress reducer: 0.1 to 30 g, potentiometer: 0.5 to 30 g, complexing agent: 0.1 to 100 g,
The tungsten and / or titanium metal ions are Fe-X flash for use as a base electroplating performed as a pretreatment step in the production of hot-dip galvanized steel sheet, characterized in that tungsten sodium and / or potassium titanium oxalate is added in salt state . Plating solution The method of claim 1,
The Fe flash plating solution for use as a base electroplating is performed as a pretreatment step in the production of hot-dip galvanized steel sheet, characterized in that the Fe is added from a salt selected from ferrous sulfate, ferrous chloride, ferrous boride, and sulfone ferrous . delete The method of claim 1,
The antioxidant is carried out as a pretreatment step in the preparation of hot-dip galvanized steel sheet, characterized in that it is added from any one of benzoic acid, ethylene diamine + citric acid-based organics, amino acetic acid, bezelsulfonate, 4-oxo-pentanoic acid, ascorbic acid. that no Fe-X peuraeswi plating solution for electroplating using the electroplating The method of claim 1,
The stress reducing agent is any one of saccharin, tridecyloxy poly (ethyleneoxy) ethanol (3), diisodecyl phthalate N- (3-hydroxybutyllemen-P-sulfanic acid, polyalkylene polyamine, malonic acid Fe-X flash plating solution for use in base electroplating performed as a pretreatment step in the manufacture of hot-dip galvanized steel sheets characterized in that it is added from The method of claim 1,
The potentiometric improving agent for the base electroplating is performed as a pretreatment step in the production of hot dip galvanized steel sheet, characterized in that it is added from at least one of ethylene glycol, polyethylene glycol, polyamine, ethylene diamine, 2-butene-1, 4-diol . For Fe-X flash plating The method of claim 1,
The plating ion complexing agent is an electroless base metal which is performed as a pretreatment step in the production of hot-dip galvanized steel sheet , which is added from at least one of ethylene, aminoacetic acid, benzenesulfonate, gluconic acid, and 4-oxo-pentanoic acid. Fe-X peuraeswi plating solution for use in plating Preparing a steel sheet containing at least one of Si: 0.2 to 6.0%, Mn: 0.2 to 7%, and Al: 0.2 to 7.0% by weight,
Temperature: 20 ~ 85 ℃, PH: 1.0 ~ 6.5 in Fe-X flash plating solution of the composition of claim 1 to form a Fe-X metal plating layer in which Fe and W and / or Ti metal precipitated on the base steel sheet , Electroplating at a current density of 1 to 150 ASD so that the plating amount is 0.1 to 5 g / m 2,
Method for producing a hot-dip galvanized steel sheet comprising the step of hot-dip galvanizing the electroplated steel sheet precipitated Fe-X
delete delete In weight% Si: 0.2 ~ 6.0%, Mn: 0.2 ~ 7%, Al: 0.2 ~ 7.0% one species possessing plate on Fe with W and / or Ti metal is an Fe-X metal plating layer is 0.1 to precipitate containing at least ~ 5.0 g / m 2 is formed, the hot-dip galvanized steel sheet characterized in that the hot-dip galvanized layer of zinc or zinc alloy is formed on the Fe-X metal plating layer
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