Aluminum-silicon-zinc coated steel plate with antibacterial property and manufacturing method of aluminum-silicon-zinc coated steel plate

Abstract

The invention discloses an aluminum-silicon-zinc coated steel plate with antibacterial performance and a manufacturing method thereof, and belongs to the field of hot dipping. The method comprises the following steps: (a) carrying out alkali washing and electrolytic degreasing treatment, continuous annealing treatment, hot dipping, air knife purging and cooling after plating on a cold-rolled substrate to form an aluminum-silicon coating steel plate; (b) depositing a zinc film on the surface of the aluminum-silicon coated steel plate by using a magnetron sputtering coating technology to obtain an aluminum-silicon coated steel plate with the zinc film; and (b) heating the aluminum-silicon coating steel plate with the zinc film in a vacuum heating furnace, so that the coating and the surface film are fully diffused, and the aluminum-silicon-zinc coating steel plate with the antibacterial property is prepared. According to the invention, the antibacterial property is combined with the Al-Si coated steel plate, and the Al-Si coated steel plate has the properties of high temperature resistance and antibacterial property by applying a diffusion mechanism.

Description

Technical Field

[0001] The invention relates to an aluminum-silicon-zinc coated steel plate with antibacterial performance and a manufacturing method thereof, and belongs to the field of hot-dip coating. Background Art

[0002] Aluminum-silicon coating technology is a surface treatment process that forms a protective layer by hot-dip coating of aluminum-silicon alloy on the surface of steel. This technology originated in the 1950s and was originally used to improve the heat resistance and corrosion resistance of high-temperature components such as automobile exhaust systems and industrial furnaces. With the continuous improvement of the process, aluminum-silicon coatings have shown excellent resistance to high-temperature oxidation (can be used for a long time below 800°C) and good formability, and have been gradually applied to the field of automotive hot-formed steel after the 1990s. Since the 21st century, with the growing demand for lightweight automobiles, the application of aluminum-silicon coated hot-formed steel in body safety parts (such as A / B pillars, anti-collision beams, etc.) has expanded rapidly. In recent years, this technology has further optimized the uniformity and bonding strength of the coating, and has gained new applications in photovoltaic brackets, home appliance panels and other fields, becoming an important surface treatment technology that is both protective and economical.

[0003] In pursuit of health concepts, products with "antibacterial properties" are more popular among consumers. Therefore, it is necessary to prepare an aluminum-silicon-zinc coated steel plate with antibacterial properties. Summary of the Invention

[0004] To address the problems of the prior art, the present invention provides an aluminum-silicon-zinc coated steel sheet with antibacterial properties and a method for manufacturing the same. The present invention utilizes Zn as the primary antibacterial agent and utilizes a high-temperature diffusion mechanism to produce the composite coating through a two-step "deposition + diffusion" process on the Al-Si coated steel sheet.

[0005] The purpose of the present invention is achieved through the following technical solutions:

[0006] A method for manufacturing an aluminum-silicon-zinc coated steel plate with antibacterial properties, the manufacturing method comprising the following steps:

[0007] (a) A cold-rolled substrate is subjected to alkali washing and electrolytic degreasing treatment, continuous annealing, hot-dip plating, air knife purging, and post-plating cooling steps to form an aluminum-silicon (Al-Si) coated steel sheet;

[0008] (b) depositing a Zn film on the surface of the aluminum-silicon (Al-Si) coated steel plate using a magnetron sputtering coating technique to obtain an aluminum-silicon (Al-Si) coated steel plate with a Zn film;

[0009] (b) The aluminum-silicon (Al-Si) coated steel sheet with a Zn film is placed in a vacuum heating furnace for heating to allow the coating and the surface film to fully diffuse, thereby producing an aluminum-silicon-zinc (Al-Si-Zn) coated steel sheet with antibacterial properties.

[0010] Furthermore, in step (a), the chemical composition of the cold-rolled substrate is calculated by mass percentage as follows: C: 0.006-1.5%, Si: 0.02-2.5%, Mn: 0.2-2.7%, S: ≤0.15%, P: ≤0.25%, Al: 0.004-0.25%, B≤0.12%, Nb: ≤0.12%, V: ≤0.12%, Ti: ≤0.13%, Cr: ≤0.6%, Ni: ≤0.6%, Mo: ≤0.6%, and the balance (Bal.) is Fe and unavoidable impurities (referred to as Fe).

[0011] Furthermore, in step (a), the thickness of the cold-rolled substrate is 0.3-2.5 mm.

[0012] Furthermore, in step (a), during the alkaline washing and degreasing process, the alkaline solution used is a NaOH solution or a KOH solution, the mass concentration of the alkaline solution is 3-7%, and the temperature of the alkaline solution is 70-85°C.

[0013] Furthermore, in step (a), during the electrolytic degreasing process, the current value ranges from 1A to 12A.

[0014] Furthermore, in step (a), during the continuous annealing process, the annealing temperature is 700-850° C. and the strip speed is 35-150 m / min.

[0015] Furthermore, in step (a), the plating solution used in the hot-dip plating is prepared by melting Al-Si-Fe alloy ingots of a predetermined ratio to form an alloy plating solution.

[0016] Furthermore, the components of the alloy ingot with a predetermined ratio are calculated as follows by mass percentage: Si: 5-15 wt.%, Fe: 1-5 wt.%, and the balance is Al and unavoidable impurities (abbreviated as Al).

[0017] Furthermore, in step (a), during the hot dip coating process, the hot dip coating temperature is controlled to be 650-680°C, and the hot dip coating time is controlled to be 3-5s, wherein the temperature of the steel strip entering the pot is 5-10°C higher than the hot dip coating temperature.

[0018] Furthermore, in step (a), during the air knife blowing process, the air knife distance is 10-35 mm, the air knife pressure is 100-200 mbar, and by controlling the air knife blowing parameters, the thickness of the Al-Si coating after cooling is 10-35 μm.

[0019] Furthermore, in step (a), the temperature is cooled to 15-35° C. during the cooling process after plating.

[0020] Furthermore, in step (b), during the magnetron sputtering process, the sputtering current is 0.2-0.8A, the temperature of the aluminum-silicon coated steel plate is 100-300°C, and the sputtering power is 50-200W.

[0021] Furthermore, in step (c), the thickness of the Zn film on the surface of the Al-Si coated steel plate is controlled to be 1-5 μm.

[0022] Furthermore, in step (c), during the vacuum high-temperature diffusion process, the heating temperature is controlled at 400-500° C., the heating time is controlled at 1-5 min, and the coating is a mixture of Al, Si, and Zn.

[0023] Furthermore, in step (c), during the vacuum high-temperature diffusion process, the heating time is controlled within 1-5 minutes.

[0024] The aluminum-silicon-zinc coated steel plate with antibacterial properties manufactured by the above-mentioned manufacturing method comprises a steel plate substrate and an aluminum-silicon-zinc coating on the surface of the steel plate substrate.

[0025] Beneficial effects of the present invention:

[0026] (1) The present invention provides an aluminum-silicon-zinc coated steel plate with antibacterial properties and a method for manufacturing the same. A composite coating is prepared by a "two-step method" of prefabricating the coating and then performing diffusion annealing. The element distribution and organizational structure in the coating are regulated to provide the obtained steel plate with antibacterial properties.

[0027] (2) The present invention combines "antibacterial" with Al-Si coated steel plates, and uses a diffusion mechanism to make the Al-Si coated steel plates have both high temperature resistance and antibacterial properties.

[0028] (3) The present invention is based on an inorganic antibacterial mechanism and uses zinc ions (Zn2+) which are relatively safe for the human body as the main antibacterial component. Zinc-based antibacterial agents achieve efficient sterilization through a dual mechanism of action: on the one hand, zinc ions can destroy the bacterial cell membrane structure, causing the cell contents to leak out; on the other hand, zinc ions can penetrate the cell wall into the bacteria, bind to key enzymes in the bacterial metabolic process, and denature and inactivate their proteins, thereby effectively inhibiting the growth and reproduction of bacteria. This inorganic antibacterial method has the characteristics of broad-spectrum antibacterial properties, long-term stability, and high biosafety.

[0029] (4) The antibacterial (Staphylococcus aureus, Escherichia coli) rate of the aluminum-silicon-zinc coated steel plate provided by the present invention can reach 80-90%. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a mechanism diagram of the preparation process of the aluminum-silicon-zinc coated steel plate of the present invention. DETAILED DESCRIPTION

[0031] The following non-limiting examples may enable those skilled in the art to more fully understand the present invention, but are not intended to limit the present invention in any way.

[0032] Examples 1-5

[0033] A method for manufacturing an aluminum-silicon-zinc coated steel plate with antibacterial properties, comprising the following steps:

[0034] (a) melting an Al-Si-Fe alloy ingot of a predetermined ratio to prepare an alloy plating solution; wherein the composition of each element in the alloy plating solution is shown in Table 1;

[0035] (b) The cold-rolled substrate was subjected to alkali washing and electrolytic degreasing treatment, continuous annealing treatment, hot-dip plating, air knife purging, and post-plating cooling to form an Al-Si coated steel sheet; wherein, the alkali solution used in the alkali washing and degreasing process was a NaOH solution; the composition of the cold-rolled substrate is shown in Table 2, and the thickness is shown in Table 4; the preparation process parameters of the Al-Si coated steel sheet are shown in Table 3, and the steel sheet was cooled to room temperature after plating; the thickness of the Al-Si coating is shown in Table 4;

[0036] (c) depositing a Zn film on the surface of the Al-Si coated steel plate using a magnetron sputtering coating technique to obtain an Al-Si coated steel plate with a Zn film; wherein the magnetron sputtering process parameters are shown in Table 3, and the Zn film thickness is shown in Table 4;

[0037] (d) The Al-Si coated steel plate with the Zn film was placed in a vacuum heating furnace for heating to allow sufficient diffusion between the coating and the surface film, thereby producing an Al-Si-Zn coated steel plate with antibacterial properties; the parameters controlled during the vacuum high-temperature diffusion process are shown in Table 5.

[0038] Table 1 Proportion of each element in the alloy plating solution (mass ratio wt.%)

[0039] Si Fe Al Example 1 10.2 3.8 margin Example 2 8.3 2.4 margin Example 3 12.5 2.9 margin Example 4 9.6 3.2 margin Example 5 11.4 3.5 margin

[0040] Table 2 Chemical composition of cold-rolled substrate (wt.%)

[0041]

[0042]

[0043] Table 3 Preparation process parameters of Al-Si coated steel plates

[0044]

[0045] Table 4 Magnetron sputtering process parameters

[0046]

[0047] Table 5 Cold rolled substrate thickness, Al-Si coating thickness, Zn film thickness

[0048] Cold rolled substrate / mm Al-Si coating / μm Zn thin film / μm Example 1 0.45 18 2 Example 2 1.3 14 1 Example 3 0.8 23 1 Example 4 0.85 27 2 Example 5 1.4 30 3

[0049] Table 6 Parameter control of vacuum high temperature diffusion process

[0050] Heating temperature / ℃ Heating time / min Example 1 445 2 Example 2 473 4.5 Example 3 459 3 Example 4 464 2.5 Example 5 452 3

Claims

1. A method for manufacturing an aluminum-silicon-zinc coated steel sheet with antibacterial properties, characterized in that: The following steps are involved: (a) a cold-rolled substrate is subjected to alkali washing and electrolytic degreasing, continuous annealing, hot-dip plating, air knife purging, and post-plating cooling to form an aluminum-silicon coated steel sheet; (b) depositing a zinc film on the surface of the aluminum-silicon coated steel plate using a magnetron sputtering coating technique to obtain an aluminum-silicon coated steel plate with a zinc film; (b) The aluminum-silicon-coated steel plate with the zinc film is placed in a vacuum heating furnace for heating to allow the coating and the surface film to fully diffuse, thereby producing an aluminum-silicon-zinc-coated steel plate with antibacterial properties.

2. The manufacturing method according to claim 1, characterized in that In step (a), the chemical composition of the cold-rolled substrate is as follows by mass percentage: C: 0.006-1.5%, Si: 0.02-2.5%, Mn: 0.2-2.7%, S: ≤0.15%, P: ≤0.25%, Al: 0.004-0.25%, B ≤0.12%, Nb: ≤0.12%, V: ≤0.12%, Ti: ≤0.13%, Cr: ≤0.6%, Ni: ≤0.6%, Mo: ≤0.6%, and the balance is Fe and unavoidable impurities; the thickness of the cold-rolled substrate is 0.3-2.5 mm.

3. The manufacturing method according to claim 1, characterized in that In step (a), during the alkaline degreasing process, the alkaline solution used is a NaOH solution or a KOH solution, the mass concentration of the alkaline solution is 3-7%, and the temperature of the alkaline solution is 70-85° C.; during the electrolytic degreasing process, the current value is 1A-12A.

4. The manufacturing method according to claim 1, characterized in that In step (a), during the continuous annealing process, the annealing temperature is 700-850° C. and the strip speed is 35-150 m / min; During the hot-dip plating process, the plating solution used is an alloy plating solution prepared by melting an Al-Si-Fe alloy ingot; wherein the composition of the alloy ingot is as follows by mass percentage: Si: 5-15%, Fe: 1-5%, and the balance is Al and inevitable impurities.

5. The manufacturing method according to claim 1, characterized in that In step (a), during the hot-dip coating process, the hot-dip coating temperature is controlled to be 650-680° C., the hot-dip coating time is 3-5 seconds, and the temperature of the steel strip entering the pot is 5-10° C. higher than the hot-dip coating temperature.

6. The manufacturing method according to claim 1, characterized in that In step (b), during the air knife blowing process, the air knife distance is 10-30 mm, and the air knife pressure is 100-200 mbar; by controlling the air knife blowing parameters, the thickness of the aluminum silicon coating after cooling is 10-35 μm; Cool to 15-35℃ during the post-plating cooling process.

7. The manufacturing method according to claim 1, characterized in that In step (b), during the magnetron sputtering process, the sputtering current is 0.2-0.8A, the temperature of the aluminum-silicon coated steel plate is 100-300°C, and the sputtering power is 50-200W.

8. The manufacturing method according to claim 1, characterized in that In step (b), the thickness of the zinc film on the surface of the aluminum-silicon coated steel plate is controlled to be 1-5 μm.

9. The manufacturing method according to claim 1, characterized in that In step (c), the heating temperature is controlled at 400-500° C. and the heating time is controlled at 1-5 min.

10. The aluminum-silicon-zinc coated steel sheet with antibacterial properties manufactured by the manufacturing method according to any one of claims 1 to 9, characterized in that: The aluminum-silicon-zinc coated steel plate comprises a steel plate substrate and an aluminum-silicon-zinc coating on the surface of the steel plate substrate.

Images