Corrosion-resistant colored galvanized guardrail

Abstract

According to the corrosion-resistant colored galvanized guardrail, the alloy plating layer, the phosphating film, the colored coating and the corrosion-resistant coating are sequentially arranged on the steel pipe base body from inside to outside, and a small amount of magnesium, aluminum, nickel and vanadium alloy elements are added into the alloy plating layer and are reasonably matched, so that the corrosion resistance and the plating property of the plating layer are improved; a phosphating film is formed through phosphating treatment, the effect of enhancing the adhesive force of the coating and the substrate is achieved, and attachment of the colored coating is facilitated; the colored coating is positioned between the phosphating film and the corrosion-resistant coating, is well protected, can keep lasting adhesion and long-term color brightness, delays the aging time of the coating, and prevents the coating from being broken and peeled off; and the corrosion-resistant coating is arranged at the outermost part, so that the effects of protecting and enhancing the corrosion resistance are achieved.

Description

Technical Field

[0001] This utility model relates to the production and manufacturing of stainless steel railings, and more particularly to a corrosion-resistant colored galvanized railing. Background Technology

[0002] Guardrails are common facilities in municipal infrastructure, bridges, highways, residences, gardens, walls, factories, and public buildings. For strength and safety reasons, galvanized steel pipe guardrails are currently one of the most frequently chosen guardrails in homes and public areas. The hot-dip galvanized layer on the surface of the steel pipe guardrail provides good corrosion resistance and offers excellent protection for outdoor guardrails. However, as people's requirements for products increase and their needs change, aesthetic demands are also being placed on the guardrails. Directly spraying colored coatings onto the surface of the guardrail steel pipes can easily lead to embrittlement, peeling, and cracking, and can also damage the hot-dip galvanized layer, affecting the guardrail's corrosion resistance. Therefore, a corrosion-resistant colored galvanized guardrail is needed, one that retains or even enhances the guardrail's corrosion resistance while providing a colored coating. Summary of the Invention

[0003] This utility model proposes a corrosion-resistant colored galvanized guardrail to solve the problem of improving the appearance of galvanized steel pipe guardrails.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A corrosion-resistant colored galvanized guardrail includes a steel pipe substrate, an alloy coating, a phosphate film, a colored coating, and a corrosion-resistant coating. The alloy coating is wrapped around the outer layer of the steel pipe substrate. The alloy coating is a coating with added magnesium, aluminum, nickel, and vanadium alloying elements on the basis of a pure zinc coating. The phosphate film covers the outer layer of the alloy coating, the colored coating covers the outer layer of the phosphate film, and the corrosion-resistant coating covers the outer layer of the colored coating.

[0006] Preferably, the alloy coating contains 0.1-0.3% magnesium by mass, no more than 0.04% aluminum by mass, 0.05-0.1% nickel by mass, and 0.03-0.08% vanadium by mass.

[0007] Preferably, the thickness of the phosphating film is 2-5 g / m. 2 .

[0008] Preferably, the colored coating is formed by spraying polyester-based colored powder coating.

[0009] Preferably, the thickness of the colored coating is 3-8 g / m. 2 .

[0010] Preferably, the corrosion-resistant coating is a water-based ceramic coating layer, which is a water-based ceramic coating composed of metal ceramic micro powder, waste metal inorganic materials and high-temperature binder.

[0011] Preferably, the thickness of the corrosion-resistant coating is 3-10 g / m. 2 .

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows: the hot-dip galvanized layer on the outside of the steel pipe substrate is improved to an alloy coating, that is, a certain amount of magnesium, aluminum, nickel and vanadium elements are added to the pure zinc coating. By adding a small amount of magnesium, aluminum, nickel and vanadium alloy elements and making reasonable proportions, the corrosion resistance and plating properties of the coating are improved. A phosphate film is formed on the outside of the alloy coating through a phosphate process, which effectively improves corrosion resistance, provides a clean, uniform and grease-free surface, improves the adhesion between the coating and the colored coating, and is conducive to the adhesion of the colored coating. Attached Figure Description

[0013] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0014] Figure 1 A schematic diagram of the steel pipe structure of a corrosion-resistant colored galvanized guardrail;

[0015] Figure 2 This is a three-dimensional schematic diagram of the steel pipe structure of a corrosion-resistant colored galvanized guardrail.

[0016] Among them, the steel pipe substrate is 1, the alloy coating is 2, the phosphate film is 3, the colored coating is 4, and the corrosion-resistant coating is 5. Detailed Implementation

[0017] To provide a better understanding of the purpose, structure, features, and functions of this utility model, detailed descriptions are provided below with reference to specific embodiments.

[0018] In the description of this utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0019] Please refer to the reference. Figure 1 and Figure 2 A corrosion-resistant colored galvanized guardrail includes a steel pipe substrate 1, an alloy coating 2, a phosphate film 3, a colored coating 4, and a corrosion-resistant coating 5. The alloy coating 2 is wrapped around the outer layer of the steel pipe substrate 1. The alloy coating 2 is a coating with added magnesium, aluminum, nickel, and vanadium alloy elements on the basis of pure zinc coating. The phosphate film 3 covers the outer layer of the alloy coating 2. The colored coating 4 covers the outer layer of the phosphate film 3. The corrosion-resistant coating 5 covers the outer layer of the colored coating 4.

[0020] This utility model discloses a corrosion-resistant colored galvanized guardrail. An alloy coating 2 is plated on the outside of the steel pipe substrate 1. Compared with a pure zinc coating, the alloy coating 2 of this utility model contains magnesium, aluminum, nickel, and vanadium alloying elements. Magnesium has a significant impact on the corrosion resistance of the hot-dip galvanized coating. However, magnesium is chemically active and easily oxidized. Moreover, the oxide has low density and lacks protective effect, which can lead to oxidation of the plating solution surface. Therefore, it is necessary to strictly control the magnesium content and add a certain amount of aluminum to the plating solution to generate dense aluminum oxide to inhibit further oxidation of the plating solution surface and ensure the quality of the coating. Nickel and vanadium can reduce the corrosion current and improve the corrosion resistance of the coating.

[0021] In some embodiments, the alloy coating 2 contains 0.1-0.3% magnesium, no more than 0.04% aluminum, 0.05-0.1% nickel, and 0.03-0.08% vanadium by mass. Specifically, the hot-dip galvanizing process on the steel pipe substrate 1 involves cleaning the steel pipe substrate 1 to remove surface oil and oxides, drying it, immersing it in a flux for a period of time, drying it again, and then hot-dip galvanizing it to coat the surface of the steel pipe substrate 1 with an alloy coating 2. The thickness of the alloy coating 2 is greater than 65 micrometers.

[0022] This utility model discloses a corrosion-resistant colored galvanized guardrail. After cleaning and drying the steel pipe coated with the alloy coating 2, it undergoes phosphating treatment, resulting in a phosphate film 3 covering the alloy coating 2. Specifically, after treatment with a solution containing phosphates such as zinc, manganese, chromium, and iron, an insoluble phosphate film is formed on the surface of the base metal. The phosphate film 3 primarily enhances the adhesion between the coating and the substrate, effectively improving corrosion resistance, providing a clean, uniform, and grease-free surface, and increasing adhesion between the phosphate film and the colored coating 4, thus facilitating the adhesion of the colored coating 4.

[0023] In some embodiments, the thickness of the phosphating film 3 is 2-5 g / m. 2 A thicker film layer can also enhance rust prevention.

[0024] This utility model discloses a corrosion-resistant colored galvanized guardrail. A colored coating 4 is sprayed onto the outside of the phosphate film 3, making the guardrail steel pipe a colored steel pipe and improving its aesthetic appeal. In some embodiments, the colored coating 4 is sprayed with polyester-based colored powder coating. Polyester-based colored powder coating can withstand high-temperature baking above 200℃, has strong UV resistance, strong color durability, and strong stain resistance and self-cleaning ability, meeting customers' aesthetic needs for various color combinations. It also adheres well to both the alloy plating layer 2 and the corrosion-resistant layer.

[0025] In some embodiments, the thickness of the colored coating 4 is 3-8 g / m². 2 .

[0026] The corrosion-resistant colored galvanized guardrail of this utility model has an additional corrosion-resistant coating 5 on the outside of the colored coating 4. The presence of the corrosion-resistant coating 5 effectively prevents the colored coating 4 from being directly exposed to the air, protects the colored coating 4, prevents the colored coating 4 from peeling or cracking, and improves the corrosion resistance and surface strength of the guardrail.

[0027] In some embodiments, the corrosion-resistant coating 5 is a water-based ceramic coating layer, which is composed of metal ceramic micropowder, waste metal inorganic materials, and high-temperature binders. Using a ceramic coating as the corrosion-resistant coating 5 improves oxidation resistance, reduces the corrosion rate of the railing, enhances the corrosion resistance of the railing's outer surface, extends the railing's service life, and ensures that the railing's color remains intact and vibrant for a long period.

[0028] In some embodiments, the thickness of the corrosion-resistant coating is 3-10 g / m. 2 .

[0029] In summary, the corrosion-resistant colored galvanized guardrail of this utility model comprises, from the inside out, an alloy coating, a phosphate film, a colored coating, and a corrosion-resistant coating on a steel pipe substrate. The alloy coating incorporates small amounts of magnesium, aluminum, nickel, and vanadium alloying elements in a reasonable ratio, improving its corrosion resistance and plating applicability. The phosphate treatment forms a phosphate film, enhancing the adhesion between the coating and the substrate, which is beneficial for the adhesion of the colored coating. The colored coating, located between the phosphate film and the corrosion-resistant coating, is well protected, maintaining long-term adhesion and vibrant color, delaying coating aging, and preventing coating cracking and peeling. The outermost corrosion-resistant coating further protects and enhances corrosion resistance.

[0030] This utility model has been described by the above-described embodiments; however, these embodiments are merely examples for implementing this utility model. It must be noted that the disclosed embodiments do not limit the scope of this utility model. Conversely, any modifications and refinements made without departing from the spirit and scope of this utility model are within the scope of patent protection of this utility model.

Claims

1. A corrosion resistant, color-coated galvanized guardrail, characterized by: It comprises a steel pipe base, an alloy plating layer, a phosphating film, a color coating layer and a corrosion-resistant coating layer; the alloy plating layer is wrapped on the outer layer of the steel pipe base, the alloy plating layer is a plating layer with magnesium, aluminum, nickel and vanadium alloy elements added on the basis of a pure zinc plating layer, the phosphating film covers the outer layer of the alloy plating layer, the color coating layer covers the outer layer of the phosphating film, and the corrosion-resistant coating layer covers the outer layer of the color coating layer.

2. The corrosion resistant, color-coated galvanized guardrail according to claim 1, characterized in that: The thickness of the phosphating film is 2-5 g / m 2 .

3. The corrosion resistant, color-coated galvanized guardrail according to claim 1, wherein: The color coating layer is formed by spraying polyester type color powder coating.

4. The corrosion resistant, color-coated galvanized guardrail according to claim 3, characterized in that: The thickness of the color coat is 3-8 g / m 2 .

5. The corrosion resistant, color-coated galvanized guardrail according to claim 1, wherein: The corrosion-resistant coating layer is a water-based ceramic coating layer composed of metal ceramic micropowder, waste metal inorganic material and high-temperature binder.

6. The corrosion resistant, color-coated galvanized guardrail according to claim 5, characterized in that: The thickness of the corrosion-resistant coating is 3-10 g / m 2 .

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