Method for adding aluminum-titanium-boron alloy in medium-aluminum and medium-magnesium plating solution

Abstract

The invention discloses a method for adding an aluminum-titanium-boron alloy in a medium-aluminum and medium-magnesium plating solution, which comprises the following steps: (1) when an aluminum-titanium-boron alloy bag is added for the first time, adding operation is carried out by utilizing a zinc-aluminum-magnesium production line during overhauling or line stopping; (2) when the aluminum-titanium-boron alloy bag is added in the production process, fixing the aluminum-titanium-boron alloy bag on a stainless steel long rod according to the calculated weight, holding the stainless steel long rod by an operator, inserting the aluminum-titanium-boron alloy bag into a plating solution, placing the aluminum-titanium-boron alloy bag at the throat position of a zinc pot sensor, increasing the temperature set value of the zinc pot by 1-2 DEG C, and keeping the temperature for 1-2 hours; enabling the zinc pot inductor to operate at high power, and uniformly mixing the aluminum-titanium-boron alloy powder under the stirring action of the zinc pot inductor and the sink roll. According to the method for adding the aluminum-titanium-boron alloy into the medium-aluminum and medium-magnesium plating solution, the components can be adjusted according to needs, and the requirements of various users are met.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of metal alloys, and particularly relates to a method for adding an aluminum-titanium-boron alloy to a medium-aluminum medium-magnesium plating solution. BACKGROUND

[0002] In recent years, zinc-aluminum-magnesium plated steel sheets have developed rapidly due to their good corrosion resistance. Compared with pure zinc plating, the corrosion resistance of zinc-aluminum-magnesium plating has been greatly improved, and can generally reach 5-7 times that of pure zinc plating. Zinc-aluminum-magnesium plating can be roughly divided into three component systems according to the content of aluminum and magnesium in the plating, namely, a low-aluminum low-magnesium system (2AL-1.5Mg system), a medium-aluminum medium-magnesium system (6AL-3Mg system), and a high-aluminum high-magnesium / medium-magnesium system (11AL-6 / 3Mg system). The application of aluminum-titanium-boron grain refiner in aluminum alloys is very mature, which can not only refine the grains but also eliminate the columnar crystal feather of aluminum alloys, improve the internal quality of aluminum alloys, and improve the mechanical properties. Since the aluminum content in zinc-aluminum-magnesium products is high, the aluminum-titanium-boron grain refiner is introduced into the zinc-aluminum-magnesium plating in the patent, the zinc-aluminum-magnesium plating structure is further refined by adding the aluminum-titanium-boron grain refiner, and the surface quality is improved, which can effectively improve the surface quality of medium-aluminum medium-magnesium zinc-aluminum-magnesium products.

[0003] Traditional processes such as patent CN 108977695 B, a hot-dip galvanizing zinc-aluminum-magnesium alloy containing titanium and antimony and a preparation method thereof, are according to the content ratio of each alloy element in the plating, and the zinc-aluminum-magnesium alloy ingot with fixed chemical composition is smelted by a metallurgical casting method in advance. The alloy ingot is placed in a zinc pot for melting during on-site production, and the composition is fixed and does not have adjustment ability. SUMMARY

[0004] The purpose of the present application is to provide a method for adding an aluminum-titanium-boron alloy to a medium-aluminum medium-magnesium plating solution, which can adjust the composition as needed and is suitable for various user needs.

[0005] To solve the above technical problems, the technical scheme adopted by the present application is as follows:

[0006] The present application provides a method for adding an aluminum-titanium-boron alloy to a medium-aluminum medium-magnesium plating solution, which comprises the following steps:

[0007] (1) When adding aluminum-titanium-boron alloy for the first time, the addition operation should be carried out during the maintenance or shutdown of the zinc-aluminum-magnesium production line. The aluminum-titanium-boron alloy bag is placed into the cage according to the calculated weight, and the cage is placed into the zinc-aluminum-magnesium plating solution using an electric hoist. The cage should be at least 500mm below the liquid surface. After the cage is placed in the solution for 1 hour, a stainless steel pipe with a length of 3-5m is used. A valve is installed on one side of the stainless steel pipe, and the valve position is connected to the nitrogen gas source with a hose. The stainless steel pipe is inserted into the zinc-aluminum-magnesium plating solution, and the valve is slowly opened (to prevent the plating solution from splashing). The zinc-aluminum-magnesium plating solution is stirred with nitrogen gas to ensure that the aluminum-titanium-boron alloy powder is fully and evenly mixed in the plating solution. The nitrogen stirring time should be 1-3 hours, and the position of the nitrogen gas pipe should be adjusted during the stirring process to ensure that the plating solution in all parts of the zinc pot is evenly mixed.

[0008] (2) When adding aluminum-titanium-boron alloy packs during the production process, fix the aluminum-titanium-boron alloy packs on a stainless steel long rod according to the calculated weight. The operator holds the stainless steel long rod and inserts the aluminum-titanium-boron alloy packs into the plating solution. The aluminum-titanium-boron alloy packs are placed at the throat of the zinc pot sensor. At the same time, the zinc pot temperature setting value (420-450℃) is increased by 1-2℃, so that the zinc pot sensor runs at high power. With the stirring action of the zinc pot sensor and the submerged roller, the aluminum-titanium-boron alloy powders are evenly mixed.

[0009] Furthermore, the aluminum-titanium-boron alloy uses an Al5Ti1B or Al3Ti1B composition.

[0010] Furthermore, the aluminum-titanium-boron alloy is ground into fine powder with particles smaller than 10 μm. To facilitate addition to the zinc-aluminum-magnesium pot, the aluminum-titanium-boron alloy powder is wrapped in aluminum foil with a thickness of 0.1-0.3 mm and packaged into 10 kg ± 2 kg aluminum-titanium-boron alloy packages for later use.

[0011] Furthermore, the chemical composition of the magnesium-based plating solution of Chinalco is as follows (by mass percentage): Al: 5.0-13%, Mg: 1.5-3.0%, Si: 0.05-0.5%, with the balance being Zn.

[0012] Furthermore, when adding aluminum-titanium-boron alloy packages during the production process, add 100kg-1000kg of aluminum-titanium-boron alloy packages.

[0013] Furthermore, the temperature of the zinc-aluminum-magnesium plating bath is controlled at 420-450℃.

[0014] Furthermore, the temperature of the strip entering the pot is adjusted according to the thickness of the strip, and controlled within the range of 430-460℃.

[0015] Compared with the prior art, the beneficial technical effects of the present invention are as follows:

[0016] This invention patent has developed a method for adding aluminum-titanium-boron alloy online during on-site production, which allows for adjustment of the composition as needed and is suitable for various user requirements. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings.

[0018] Figure 1 The surface of the zinc-aluminum-magnesium coating without aluminum-titanium-boron alloy;

[0019] Figure 2 The surface of the zinc-aluminum-magnesium coating of the aluminum-titanium-boron alloy;

[0020] Figure 3 The cross-sectional microstructure of zinc-aluminum-magnesium coating without aluminum-titanium-boron alloy is shown.

[0021] Figure 4 The microstructure of the zinc-aluminum-magnesium coating on the aluminum-titanium-boron alloy is shown. Detailed Implementation

[0022] A method for adding an aluminum-titanium-boron alloy to a medium-magnesium aluminum plating bath includes:

[0023] Preparation of aluminum-titanium-boron alloy cladding

[0024] The aluminum-titanium-boron alloy uses Al5Ti1B or Al3Ti1B composition. The aluminum-titanium-boron alloy is ground into fine powder with particles smaller than 10μm. In order to facilitate addition in the zinc-aluminum-magnesium pot, the aluminum-titanium-boron alloy powder is wrapped in aluminum foil with a thickness of 0.1-0.3mm and packaged into 10kg±2kg aluminum-titanium-boron alloy packages for later use.

[0025] Aluminum-titanium-boron alloy package addition method

[0026] (1) When adding aluminum-titanium-boron alloy for the first time, it is recommended to do so during the maintenance or shutdown of the zinc-aluminum-magnesium production line. Place the aluminum-titanium-boron alloy bag into the cage according to the calculated weight, and use an electric hoist to put the cage into the zinc-aluminum-magnesium plating solution. The cage should be at least 500mm below the liquid surface. After the cage has been in place for 1 hour, use a stainless steel pipe with a length of 3-5m. Install a valve on one side of the stainless steel pipe and connect the valve to the nitrogen gas source with a hose. Insert the stainless steel pipe into the zinc-aluminum-magnesium plating solution and slowly open the valve (to prevent the plating solution from splashing). Use nitrogen to stir the zinc-aluminum-magnesium plating solution so that the aluminum-titanium-boron alloy powder is fully mixed evenly in the plating solution. The nitrogen stirring time should be 1-3 hours, and the position of the nitrogen pipe should be adjusted during the stirring process to ensure that the plating solution in all parts of the zinc pot is mixed evenly.

[0027] (2) When adding aluminum-titanium-boron alloy packs during the production process, fix the aluminum-titanium-boron alloy packs on the stainless steel long rod according to the calculated weight. The operator holds the stainless steel long rod and inserts the aluminum-titanium-boron alloy packs into the plating solution. The aluminum-titanium-boron alloy packs are placed at the throat of the zinc pot sensor. At the same time, the zinc pot temperature setting is increased by 1-2℃, and the zinc pot sensor is operated at high power. With the stirring action of the zinc pot sensor and the submerged roller, the aluminum-titanium-boron alloy powders are evenly mixed.

[0028] Production of aluminum-titanium-boron alloy coated steel sheets with medium aluminum, medium magnesium, zinc, aluminum, and magnesium alloys.

[0029] Plating bath composition control: The composition of the magnesium-based plating bath of China Aluminum is Al: 5.0-13%, Mg: 1.5-3.0%, Si: 0.05-0.5%, with the balance being Zn.

[0030] Add 100kg-1000kg of aluminum-titanium-boron alloy according to the method used when adding the aluminum-titanium-boron alloy bag during the production process;

[0031] For hot-dip galvanizing process control, the temperature of the zinc-aluminum-magnesium plating bath is controlled at 420-450℃; the strip entry temperature is adjusted according to the strip thickness and controlled within the range of 430-460℃; other parameters are controlled according to normal production requirements.

[0032] Case Study:

[0033] Using the above process control, a trial production of aluminum-titanium-boron alloy zinc-aluminum-magnesium coated products was carried out. The coating composition was Al: 5.7%, Mg: 2.3%, Si: 0.1%, with the balance being Zn.

[0034] The zinc-aluminum-magnesium coating with added aluminum-titanium-boron alloy exhibits good surface quality, see... Figure 1 , Figure 2 The cross-sectional morphologies of zinc-aluminum-magnesium coatings with and without aluminum-titanium-boron alloys under the same process are shown in [reference needed]. Figure 3 , Figure 4 .

[0035] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A method for adding an aluminum-titanium-boron alloy to a medium-aluminum magnesium plating bath, characterized in that: include: (1) When adding the aluminum-titanium-boron alloy bag for the first time, the addition operation should be carried out during the maintenance or shutdown of the zinc-aluminum-magnesium production line. The aluminum-titanium-boron alloy bag is placed into the cage according to the calculated weight, and the cage is placed into the zinc-aluminum-magnesium plating solution using an electric hoist. The cage should be at least 500mm below the liquid surface. After the cage is placed in the solution for 1 hour, a stainless steel pipe with a length of 3-5m is used. A valve is installed on one side of the stainless steel pipe, and the valve position is connected to the nitrogen gas source with a hose. The stainless steel pipe is inserted into the zinc-aluminum-magnesium plating solution, and the valve is slowly opened. The zinc-aluminum-magnesium plating solution is stirred with nitrogen gas to ensure that the aluminum-titanium-boron alloy powder is fully and evenly mixed in the plating solution. The nitrogen stirring time should be 1-3 hours, and the position of the nitrogen gas pipe should be adjusted during the stirring process to ensure that the plating solution in all parts of the zinc pot is evenly mixed. (2) When adding aluminum-titanium-boron alloy packs during the production process, fix the aluminum-titanium-boron alloy packs on the stainless steel long rod according to the calculated weight. The operator holds the stainless steel long rod and inserts the aluminum-titanium-boron alloy packs into the plating solution. The aluminum-titanium-boron alloy packs are placed at the throat of the zinc pot sensor. At the same time, the zinc pot temperature setting is increased by 1-2℃, and the zinc pot sensor is operated at high power. With the stirring action of the zinc pot sensor and the submerged roller, the aluminum-titanium-boron alloy powders are evenly mixed.

2. The method for adding aluminum-titanium-boron alloy to a medium-aluminum-magnesium plating bath according to claim 1, characterized in that: The aluminum-titanium-boron alloy uses an Al5Ti1B or Al3Ti1B composition.

3. The method for adding aluminum-titanium-boron alloy to a medium-aluminum-magnesium plating bath according to claim 1 or 2, characterized in that: The aluminum-titanium-boron alloy is ground into a fine powder with particles smaller than 10 μm. To facilitate its addition to the zinc-aluminum-magnesium pot, the aluminum-titanium-boron alloy powder is wrapped in aluminum foil with a thickness of 0.1-0.3 mm and packaged into 10 kg ± 2 kg aluminum-titanium-boron alloy packages for later use.

4. The method for adding aluminum-titanium-boron alloy to a medium-aluminum-magnesium plating bath according to claim 1, characterized in that: The chemical composition of the magnesium-based plating solution of Chinalco is as follows (by mass percentage): Al: 5.0-13%, Mg: 1.5-3.0%, Si: 0.05-0.5%, with the balance being Zn.

5. The method for adding aluminum-titanium-boron alloy to a medium-aluminum-magnesium plating bath according to claim 1, characterized in that: When adding aluminum-titanium-boron alloy packages during the production process, add 100kg-1000kg of aluminum-titanium-boron alloy packages.

6. The method for adding aluminum-titanium-boron alloy to a medium-aluminum-magnesium plating bath according to claim 1, characterized in that: The temperature of the zinc-aluminum-magnesium plating bath should be controlled at 420-450℃.

7. The method for adding aluminum-titanium-boron alloy to a medium-aluminum-magnesium plating bath according to claim 1, characterized in that: Adjust the strip temperature before it enters the pot according to the strip thickness, and control it within the range of 430-460℃.

Images