Coating Composition for Obtaining Zinc-Aluminum-Magnesium (Zn-Al-Mg) Alloy Coated Steel Products

Abstract

The invention relates to a zinc-aluminum-magnesium (Zn-Al-Mg / ZAM) alloy coating composition for the corrosion protection of steel sheets. The invention specifically relates to a zinc-aluminum-magnesium (Zn-Al-Mg) alloy coating and a method for applying this coating, intended for use in areas where corrosion-resistant steel products are used, such as building and construction, solar energy systems, automotive and commercial vehicles, household appliances, heating-cooling-ventilation (HVAC), cable handling systems, industrial racking and storage, silos and agricultural structures, greenhouse structures, electrical and energy infrastructure, traffic and road safety systems, and the manufacture of industrial equipment and machinery.

Description

Obtaining Zinc-Aluminum-Magnesium (Zn-Al-Mg) Alloy Coated Steel Products Coating Composition for Application Technical Area The invention is a zinc-aluminum-magnesium solution for the corrosion protection of steel sheets. This relates to the composition of (Zn-Al-Mg / ZAM) based alloy coatings. The invention is particularly relevant to building and construction, solar energy systems, automotive and commercial vehicles, and household appliances. Heating, cooling, and ventilation (HVAC), cable management systems, industrial racking, and storage, silos and agricultural structures, greenhouse structures, electrical and energy infrastructure, traffic and roads corrosion-resistant steel used in safety systems and industrial equipment and machinery manufacturing. Zinc-aluminum-magnesium (Zn-Al-Mg) for use in areas where the products are used. It relates to an alloy coating and a method for applying this coating. State of the Art Steel is characterized by its high mechanical strength, formability, weldability, availability, and Due to its economic advantages, it is used in various sectors including construction, automotive, energy, agriculture, machinery, infrastructure, and more. It is an engineering material widely used in industrial applications. Together, steel is particularly susceptible to moisture, oxygen, salts, and industrial conditions, especially in atmospheric environments. corrosion resulting from exposure to pollutants and other corrosive agents, This can negatively affect its service life and mechanical properties. Corrosion is the electrochemical reactions that a steel surface undergoes with its surroundings. This is a natural process that results in the deterioration of the metallic structure over time. Corrosion can cause loss in the cross-section of the material, and rust can appear on the surface. Other corrosion products can form and the mechanical integrity of the steel can be compromised with long-term use. This can reduce the functional properties of steel products. Therefore, the service life of steel products should be shortened. to improve corrosion resistance of the steel surface and reduce maintenance needs. Preservation is an important technical requirement. Organic coatings, paints, metallic coatings, and other materials are used in the protection of steel surfaces. Various methods are used, such as combinations of these. Metallic coating methods. Hot-dip galvanizing processes, especially in continuous production lines, have high efficiency. production capacity, process continuity and economical handling of large steel surfaces. It holds an important place because it allows for preservation. In this method, steel sheet, molten metal or A protective coating is applied to the surface by immersion in a coating bath consisting of a metal alloy. A metallic layer is being formed. In hot-dip galvanizing technologies, the composition of the coating material and the weight of the coating are important factors. coating thickness, coating microstructure and surface properties; resulting corrosion This can directly affect the durability and other performance characteristics of the product. Therefore, over time, not only zinc-based coatings but also different alloys of zinc have been used. Coating systems in which these elements are added have also been developed. In zinc-based coatings, zinc is more reactive than steel, which makes the coating more susceptible to damage. In areas where it is exposed or where the steel surface is visible, zinc primarily resists corrosion. This allows the steel to be protected by being exposed to atmospheric conditions. In addition, it protects the steel in the atmospheric environment. Corrosion products formed as a result of the corrosion of zinc and alloy elements also appear on the surface. By forming a barrier effect, it can limit the progression of the corrosion process. In order to develop these protective mechanisms, aluminum is added to zinc. Different metallic coating systems by adding magnesium and similar alloying elements. It has been developed. In this context, hot-dip galvanizing (GI) has been applied to the surface of steel sheets for many years. Galvalume® (55% Al-43.4% Zn-1.6% Si), Galfan® (95% Zn-5% Al) and in recent years Zn-Al- Mg-based alloy coating systems are used. In traditional hot-dip galvanizing (GI) coatings, corrosion protection is primarily based on... Zinc is more active than the steel surface and acts as a sacrificial anode during corrosion. It is based on the principle of its behavior. However, high corrosion resistance Coating to ensure sufficient service life in applications where required. It may be necessary to increase the thickness or weight of the coating. The amount of coating Increasing this would lead to increased metal consumption and consequently increased production costs, as well as This can lead to an increase in the unit weight of the coated product. Particularly solar energy carrier systems, agricultural structures, infrastructure equipment, automotive and steel structures used outdoors, for example, those exposed to atmospheric effects for extended periods in applications that can provide high corrosion resistance with lower coating weights. Alternative coating systems are needed. In response to this need, Zn-Al-Mg based alloy coating technologies have been developed and different It has started to be used in commercial applications. Zinc is used in these coating systems. Thanks to the presence of aluminum and magnesium in specific proportions within its matrix, 3 Compared to traditional Zn coatings, the formation and distribution of corrosion products are altered. and accordingly, especially on cutting edges, scratch areas and the general surface Improved corrosion resistance can be achieved. However, Zn-Al-Mg The performance of coatings depends not only on the alloy composition but also on the coating itself. bath conditions, solidification behavior, cooling rate and coating microstructure It also depends on its formation. The amounts of aluminum and magnesium in Zn-Al-Mg based coating systems the type, quantity, morphology, and distribution of phases formed during solidification as a result of changes This also changes. Especially in compositions where aluminum content increases, dendritic the formation of structures, the distribution of eutectic phases and magnesium-containing intermetallic phases, It is particularly important to control the formation and distribution of MgZn₂-based phases. It is gaining. As a result of variations in solidification conditions, the microstructure Disruption of homogeneity; surface appearance and mechanical properties of the coating, This can have negative effects on formability and corrosion behavior. In addition, high amounts of alloying elements are used in Zn-Al-Mg coating systems. Its use allows for the control of the continuous hot-dip galvanizing process compared to traditional GI. This can make it more sensitive compared to coatings. Coating bath temperature, steel strip exit conditions from the bath, air knife pressure and position, strip speed and cooling. Process parameters such as conditions affect the coating microstructure and final surface properties. They have significant effects. These parameters must be controlled with sufficient precision. If this cannot be done, homogeneity problems in coating thickness and composition, surface Roughness, surface defects, and deterioration in surface appearance may occur. Especially in continuous galvanizing lines, the gap between the coating bath and the atmosphere... interaction, oxidation and metallic residues or surface deposits formed in the plating bath This can also affect surface quality. Therefore, Zn-Al- containing high alloying elements In Mg coating systems, it is sufficient to obtain only the targeted chemical composition. not, and the composition in question is maintained stably under industrial production conditions and Creating a homogeneous coating microstructure is also important. Another important consideration in current Zn-Al-Mg coating technologies is the compatibility of different steel grades and production conditions include the same level of surface quality, coating homogeneity and corrosion. The goal is to maintain its performance. This involves the alloy composition, solidification rate, and process. Because the parameters interact with each other, laboratory or limited 4 a coating composition that is successful under production conditions, continuous and high-speed It is not always possible to transfer them directly to industrial production lines. When evaluated from Türkiye's perspective, the focus is on Zn-Al-Mg coated steel products. Despite the existence of usage and demand, the appropriate materials used in the production of these products are not suitable. towards the domestic development of alloy compositions and production processes. The need persists. The products are largely supplied through imports; supply... longer lead times, increased logistics costs, exposure to price fluctuations and can create disadvantages such as continued dependence on foreign sources. Furthermore, domestic production... development of infrastructure, coating properties for different application areas process optimizing products according to their conditions and customer-specific technical requirements. This will allow for its development accordingly. Therefore, in the current state of the art, Zn-Al-Mg based coating systems are available. Together, the coating alloy composition and the solidification microstructure are controlled. to ensure process stability, improve surface quality, and high corrosion resistance achieved with low or optimized coating weights Improvements are needed in order to make it possible. In the literature review, EP4299786B1 is given as an example of the known state of the technique. Application number [number] can be shown. The relevant application concerns a steel material; and a part of the steel material. hot-dip coated, which contains a hot-dip coating layer placed on its surface This relates to steel material. Here, the hot-dip coating layer is 10.0%–30.0% by weight. Al, 3.0–15.0% Mg, 0.01–15.0% Fe and optionally 0–10.0% Si, 0–1.0% Ni and containing 0–4.0% Ca, also Sb, Pb, Cu, Sn, Ti, Cr, Nb, Zr, Mn, Mo, Ag, Li, La, Ce, B, Y, One or more of the elements P, Sr, Co, Bi, In, V and W, totaling 5% by weight. a compound that may contain smaller amounts of Zn, with the remainder consisting of Zn and impurities It is defined as such. However, the document mentions the protection of steel sheets against corrosion. Zn- containing 95.0–98.5% Zn, 0.5–2.00% Al and 0.2–1.5% Mg by weight for use. Al-Mg alloy coating composition or controlled cooling rate of 5–30°C / sec Process conditions such as implementation are not mentioned. In conclusion, due to the negative aspects described above and the current solutions, the subject matter... Due to its shortcomings, an improvement is needed in the relevant technical field. It has been made. 35 5 Purpose of the Invention The present invention meets the aforementioned requirements while eliminating all disadvantages. zinc-aluminum-magnesium (Zn-Al-Mg) alloy, which removes and brings some additional advantages. It relates to the coating composition. The primary aim of the invention is to utilize the extra axodic protective power provided by magnesium. a surface that can be used, however, with high magnesium content oxidation, dark surface appearance, technical difficulties in paint compatibility and process dangers and inefficiencies associated with high concentrations of molten zinc during the process to develop the most optimum metallic composition in a way that will reduce corrosion of steel sheets for use in protection against... continuous hot-dip galvanizing (CGL) a new zinc (Zn), aluminum (Al) and magnesium (Mg) based system that can be applied in production lines The goal is to develop alloy coatings. The aim of the invention is to provide a Zn-Al-Mg based coating composition for steel sheets. protection against atmospheric corrosion and continuous industrial-scale production of the said composition and to ensure its consistent implementation. One aim of the invention is to control the application of coating composition and post-coating processes. By jointly regulating the cooling conditions, the curing behavior of the coating and The aim is to ensure that its microstructure is controlled. Another objective of the invention is to analyze the Zn-based structure formed within the coating and the phases containing MgZn₂. by regulating its formation and distribution through controlled solidification conditions, The aim is to contribute to improving the corrosion performance of the coating. Another objective of the invention is to improve the microstructure of the coating through controlled cooling conditions. to control any unwanted dendritic and / or eutectic structures that may occur and The aim is to achieve a more homogeneous microstructure throughout the coating process. Another objective of the invention is to prevent surface ash formation on Zn-Al-Mg coated steel sheets. a process aimed at reducing roughness and variations in surface appearance to meet the conditions. 35 6 Another aim of the invention is to achieve higher atmospheric resistance compared to traditional zinc coatings. Obtaining steel products with Zn-Al-Mg coatings that can provide corrosion resistance and thus achieving the same or improved corrosion performance with appropriate coating weights. to contribute to its provision. Another objective of the invention is the development and production of the aforementioned Zn-Al-Mg coating composition. the applicability of the method to existing continuous hot-dip galvanizing lines by providing Zn-Al- without the need for a new and completely different production line investment. The aim is to enable the production of magnesium-coated steel products. Another objective of the invention is to develop a Zn-Al-Mg coating technology that can be produced in Türkiye. by providing, the domestic production of Zn-Al-Mg coated steel products and in these products The aim is to contribute to reducing dependence on imports. Another purpose of the invention is for applications in buildings, solar energy systems, automotive, home appliances, HVAC, and cables. transportation systems, industrial shelving, agricultural structures, energy infrastructure and similar outdoor environments or high corrosion resistance for use in applications exposed to corrosion. The goal is to produce Zn-Al-Mg coated steel products. The invention relates to the production of molten crucibles containing metallic alloys with Al<2% and Mg<1.5%. The goal is to develop metallic coatings. To achieve the purposes described above, the invention provides corrosion protection for steel sheets. zinc-aluminum-magnesium (Zn-Al-Mg) alloy for use in protection It is a coating composition containing 0.5% - 2% aluminum (Al) by weight, and 0.2% by weight. - It contains 1.5% magnesium (Mg) and the remainder is zinc (Zn). To achieve the purposes described above, the invention involves the continuous galvanization of steel sheets. corrosion-resistant zinc-aluminum-magnesium (Zn-Al-Mg) alloy in production lines (CGL) It is a method for coating and involves the following steps; a) Cleaning the surface of the steel part and feeding it into the continuous galvanizing line, b) Annealing the steel part in an annealing furnace. c) Zn-Al-Mg alloy containing 0.5% - 2.00% Al and 0.2% - 1.50% Mg and the remainder Zn by weight Preparation of the plating bath, 35 d) Passing the steel product through the prepared Zn-Al-Mg bath and then applying it to the steel surface Formation of a Zn-Al-Mg alloy coating on it, 7 e) The steel product exiting the plating bath is passed through an air knife system. Checking the coating amount and coating thickness f) Controlled cooling of the steel product after coating. The structural and characteristic features and all the advantages of the invention are detailed below. This will be understood more clearly thanks to the explanation, and therefore the evaluation will also be based on this. This should be done taking into account the detailed explanation. Detailed Description of the Invention This detailed explanation of the invention is solely for the purpose of better understanding the subject and does not include any other information. It is explained in a way that will not create a limiting effect. The invention provides corrosion protection for steel sheets through continuous hot-dip galvanizing. zinc-aluminum-magnesium (Zn-Al-Mg) alloy for use in protection This relates to the coating composition, containing 0.5% - 2.00% aluminum (Al) by weight, and 0.2%. - It contains 1.50% magnesium (Mg) and zinc (Zn). The coating composition of the invention consists of 95.0% - 98.5% Zn, 0.5% - 2% Al and 0.2% - by weight. It contains 1.5 mg. The coating composition that is the subject of this invention preferably contains 97.5% zinc by weight. The coating composition that is the subject of this invention preferably contains 1.8% aluminum by weight. The coating composition that is the subject of this invention preferably contains 1.45% magnesium by weight. A preferred composition within the scope of the invention is as follows:  Aluminum (Al): 0.5% – 2.0%  Magnesium (Mg): 0.2% – 1.5%  Remaining: Zinc (Zn) Other applications of the coating described in the invention include 0.5% – 2.0% aluminum (Al) by weight, 0.2% – It contains 1.5% Magnesium (Mg), 0.01% – 0.30% Silicon (Si) and the remainder is Zinc (Zn). 35. Silicon addition increases the stability of the coating bath and the intermetallic layer. It can be used to control its formation. 8 Another application of the coating described in the invention is for aluminum (Al) with 0.5% – 2.0% by weight. 0.2% – 1.5% Magnesium (Mg), 0.001% – 0.10% Silicon (Si) and the remainder Zinc (Zn) It includes. The invention relates to zinc-aluminum-magnesium (Zn-) produced by hot-dip galvanizing. Coating for obtaining Al-Mg alloy coated steel products. The elements used in its composition and their technical contributions are explained below. Zinc (Zn) is the main component of the plating system. It acts as the selfless anode on the steel surface. It provides galvanic protection by preventing the steel surface from rusting under atmospheric conditions. and constitutes the basic protective function of the coating. Furthermore, the coating's continuous... It is the main metal phase that enables the application in the galvanizing process. Aluminum (Al) is a key alloying element that enhances corrosion resistance in coatings. It increases the stability of the protective oxide layer formed on the zinc surface and extends the life of the coating. It improves its long-term atmospheric resistance. It also alters the phase structure formed during solidification. By influencing it, it contributes to the control of the coating microstructure. Magnesium (Mg) is the most important component providing high corrosion resistance to Zn-Al-Mg coatings. It is one of the important alloying elements. The protective reaction that occurs during corrosion. Increasing the density of the products improves the performance of the coating in aggressive atmospheric conditions. It enhances the effect. Protective products are applied to cut edge areas and surfaces where mechanical damage has occurred. By supporting its formation, it extends the service life of the coating. The invention relates to corrosion-resistant zinc-coating of steel sheets in continuous galvanizing lines (CGL). It relates to a method for coating aluminum-magnesium (Zn-Al-Mg) alloys, It includes the following steps; a) Cleaning the surface of the steel part and feeding it into the continuous galvanizing line, b) Annealing the steel part in an annealing furnace. c) Zn-Al-Mg alloy containing 0.5% - 2% Al and 0.2% - 1.5% Mg and the remainder Zn by weight Preparation of the plating bath, d) Passing the steel product through the prepared Zn-Al-Mg bath and applying it to the steel surface Formation of a Zn-Al-Mg alloy coating on it, e) The steel product exiting the plating bath is passed through an air knife system. 35. Checking the coating quantity and coating thickness. f) Controlled cooling of the steel product after coating 9 In the method described in the invention, the plating bath temperature is preferably 430–470°C or higher. preferably in the range of 445 – 460°C. In the method described in the invention, the residence time of the steel part in the coating bath is preferably 2-15 days. The time is preferably between 3 and 8 seconds. In the method described in the invention, hydrogen nitrogen is used as a protective atmosphere during the annealing process. A mixed atmosphere control system is used. Here, the Annealing Furnace (SNOUT) Outlet is used. The temperature is preferably in the range of 430–520°C, or even more preferably 450–490°C. In step (e) of the method described in the invention, the steel product after coating is heated to a temperature range of 5–30°C / sec. It is cooled with a controlled cooling rate. This controlled cooling affects the coating. solidification behavior and distribution of MgZn₂-containing phases formed within the Zn-based structure It is implemented in a way that allows for control. In the preferred approach;  ZM50  ZM70  ZM90  ZM120  ZM150  ZM200 Coating classes are obtained. ZM50 and ZM120 levels are particularly preferred in applications. The invention describes a method that also involves obtaining a Zn-Al-Mg alloy after controlled cooling. This involves checking the microstructure and surface quality of the coating. The plating bath used in the invention consists of specified zinc, aluminum, and magnesium. It is the basic production environment in which the components are homogeneously combined in proportions. Within the scope of the invention... The defined alloy composition will be distinct from existing patent protections. It has been determined that it provides both high corrosion resistance and freedom in production. The Continuous Galvanizing Line (CGL) coating process in question is an industrial-scale process. It is a production system that enables the application of 35. Controlled coating of steel strip 10 By ensuring that it passes through the bath, it contributes to achieving a homogeneous coating thickness. It is found. The controlled cooling system is one of the key elements of the invention. Post-coating. Through the applied controlled cooling process, the solidification behavior is guided and The coating microstructure is controlled. This improves surface quality and phase distribution. It is being improved and a production method different from existing patents is being created. The Air Knife System removes excess alloy remaining on the steel surface after exiting the plating bath. It ensures removal and the achievement of the desired coating thickness. Homogeneous It contributes to improving surface quality by creating a coating dispersion. The invention utilizes a nitrogen atmosphere control system, and this is used during the coating process. It ensures that oxidation is kept under control. Thus, unwanted oxidation is prevented on the coating surface. By reducing oxide formation, a more stable production process is achieved. The Coating Thickness Control System used in the invention controls the weight and thickness of the coating. This ensures that the values ​​are kept within the target range. This improves both corrosion performance and overall performance. Cost optimization is being carried out. The Surface Preparation System ensures the steel surface is cleaned before coating. It helps the coating to adhere properly to the surface. Insufficient surface preparation. Potential adhesion and surface defects that may result are prevented. Controlled microstructure formation refers to the special alloy composition created within the scope of the invention. And thanks to controlled cooling parameters, the distribution of phases containing Zn, Al, and Mg is controlled. This situation affects corrosion resistance, surface quality and formability. It contributes to the improvement of its features. The elements included in the invention work together to produce a patented product with high corrosion resistance. can be produced independently of their protective coatings, with improved surface quality and industrial properties. It forms a feasible Zn-Al-Mg coating on a scale. A sample application of the invented method is carried out as follows: 35 a) Preparation of Steel Strip 11 The steel strip is placed into the surface preparation system. At this stage, the oil present on the surface is removed. Oxide, dirt, and rolling mill residues are removed. The cleaned strip is then fed into the continuous galvanizing line. It feeds. b) Annealing process The steel strip is passed through an annealing furnace. During the annealing process, a protective atmosphere is used. A hydrogen nitrogen atmosphere control system is used. The amount of oxygen in the atmosphere... It is kept to a minimum level. After the annealing process, the strips are brought to the appropriate temperature for the coating bath. c) Preparation of Zn-Al-Mg Plating Bath Containing 0.5% - 2.00% Al and 0.2% - 1.50% Mg by weight and the remainder Zn (preferably by weight) Zn-Al-Mg alloy coating (containing 97.5% zinc, 1.45% magnesium and 1.8% aluminum) preparing the bath The coating bath temperature is preferably in the range of 430–470°C, in the more preferred application. It is maintained at approximately 450°C. d) Coating Process Annealed steel strip is immersed in the prepared Zn-Al-Mg bath and left for a certain period of time. It is brought into contact with the alloy along its length. Depending on the strip line speed, it is placed in the plating bath. It remains there for a few seconds and a Zn-Al-Mg coating forms on its surface. e) Adjusting the Coating Thickness The strip emerging from the plating bath is passed through the air knife system. At this stage... Excess coating is removed and the targeted coating thickness is achieved with the help of a coating thickness control system. Coating weight is obtained. ZM50 and ZM120 levels are particularly preferred in applications. f) Controlled Cooling After coating, the steel strip is placed in a controlled cooling system at 10–20°C / sec. It is rapidly cooled within this range. g) Final Product and Quality Control After cooling, the product undergoes quality control. This stage includes testing for coating thickness, Surface homogeneity, adhesion, corrosion performance, and microstructure characteristics are checked. The invention involves controlling the solidification behavior of the coating layer during the cooling process. by forming Zn phases, Al-containing phases, and MgZn₂-containing phases. It is being redirected. In the preferred application, a controlled cooling rate is applied in the range of 5–30°C / sec. 35 The more preferred application is controlled cooling in the range of 10–20°C / sec. This is carried out. In this way, controlled microstructure formation is ensured. 12 The coating described in this invention has high corrosion resistance and a low coating weight equivalent to or equal to... Provides superior performance, cut-edge protection, and a long service life. Due to its advantages, it can be used in the following sectors:  Building and construction sector (roofs, facades, structural systems, light steel structures),  Solar energy systems (solar power plant constructions and assembly elements),  Automotive and commercial vehicle industry,  White goods and home appliances industry,  Heating, cooling and ventilation systems (HVAC),  Cable trays and cable management systems,  Industrial shelving and storage systems,  Silo and agricultural storage systems,  Greenhouse structures,  Electrical panels, transformers and energy infrastructure equipment,  Traffic and road safety systems,  Manufacturing of industrial equipment and machinery.

Claims

1. Zinc-aluminum alloy for use in protecting steel sheets against corrosion. It is a magnesium (Zn-Al-Mg) alloy coating composition with the characteristic of containing 0.5% by weight. 2% aluminum (Al), 0.2% - 1.5% magnesium (Mg) by weight, and the remainder. It contains zinc (Zn).

2. Coating composition conforming to Claim 1, with the characteristic of being 97.5% Zinc by weight. It includes.

3. Coating composition conforming to Claim 1, with the characteristic of containing 1.8% aluminum by weight. It includes.

4. Coating composition conforming to Claim 1, with the characteristic of containing 1.45% magnesium by weight. It includes.

5. Coating composition conforming to Claim 1, with a content of 0.01% – 0.30% by weight. It contains silicon (Si).

6. Coating composition conforming to Claim 1, with a content of 0.001% – 0.10% by weight. It contains silicon.

7. Corrosion-resistant zinc coating in continuous galvanizing lines (CGL) of steel sheets. It is a method for coating aluminum-magnesium (Zn-Al-Mg) alloys, and its characteristic feature is; a) Cleaning the surface of the steel part and feeding it into the continuous galvanizing line, b) Annealing the steel part in an annealing furnace. c) Zn-Al-Mg alloy containing 0.5% - 2.00% Al and 0.2% - 1.50% Mg and the remainder Zn by weight Preparation of the plating bath, d) Passing the steel product through the prepared Zn-Al-Mg bath and applying it to the steel surface Formation of a Zn-Al-Mg alloy coating on it, e) The steel product exiting the plating bath is passed through an air knife system. Checking the coating amount and coating thickness f) Controlled cooling of the steel product after coating It includes the steps. 35 14 8. This method complies with Claim 7 and its characteristic feature is: a protective atmosphere during the annealing process. This involves using a nitrogen atmosphere control system.

9. The method conforming to claim 7 is characterized by a plating bath temperature of 430–470°C. It is within the range.

10. This method complies with claim 7 and is characterized by a residence time in the plating bath of 2-15 days. It is within a seconds interval.

11. The method is in accordance with Claim 7, and its characteristic is; f) the steel product after coating is 5– Cooling is achieved with a controlled cooling rate in the range of 30°C / s.

12. The method compliant with claim 7 is characterized by controlled cooling in step (f). the solidification behavior of the coating and the MgZn₂ content formed within the Zn-based structure It is applied in a way that controls the distribution of phases.

13. This method complies with Claim 7 and is characterized by the fact that it is obtained after controlled cooling. Checking the microstructure and surface quality of Zn-Al-Mg alloy coatings. It includes.