Cut edge protection galvanized steel.

Cut edge protection galvanized steel, operation mode: At the cutting edge of the galvanized steel plate, apply it by hand oil-based marker or using a brush dipped in the paint to achieve the purpose of protecting the cutting edge.

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In view of the needs of galvanized steel plate trimming protection, on the basis of in-depth analysis of the current industry technology development trend and comprehensive review of practical application cases, the following will be a comprehensive and detailed analysis from the three important aspects of protection methods, material improvement and new solutions:

1. Traditional protection methods and limitations

     (1) Manual painting (oil-based marker/paint)

          Operation mode: At the cutting edge of the galvanized steel plate, apply it by hand oil-based marker or using a brush dipped in the paint to achieve the purpose of protecting the cutting edge.

     Advantages:

          Simple and convenient operation: Without the help of complex equipment and professional technical training, the operator only needs to master the basic painting skills to work. Whether it is in a small-scale production environment or for local protection of individual cutting edges, it can be easily used, and is suitable for some scenes with relatively low protection requirements, such as some non-critical parts or short-term use of galvanized steel plate cutting edge protection.

    Analysis of shortcomings:

          Low efficiency: In the face of a large area of galvanized steel cutting or the need for batch protection treatment, the manual painting method will be extremely time-consuming and labor-intensive. The operator needs to apply piece by piece and segment by segment, especially in the case of more complex cutting or a large number of cases, the work efficiency is difficult to meet the needs of large-scale production.

          Easy to miss the problem is prominent: for some dense hole cutting areas, due to its complex structure and small space, manual painting is easy to miss the situation. Once these parts are not effectively protected, they will become a hidden point of corrosion, affecting the service life and performance of the entire galvanized steel plate.

          Increase the surface resistance: Oil-based markers or coatings will form an oil film after application, which may change the resistance characteristics of the galvanized steel surface, thereby increasing the surface resistance. In some application scenarios that have strict requirements for the conductivity of electronic equipment, such as electronic instrument housings, electrical equipment components, etc., this change in conductivity may adversely affect the normal operation of the equipment.

          Interference with subsequent processes: When subsequent processing processes such as screen printing and labeling are required, the presence of oil film will bring great obstacles to these operations. The oil film may affect the adhesion effect of the screen printing ink, resulting in blurred patterns; Or make the label is not firm, easy to fall off the phenomenon, thereby reducing the overall quality of the product and production efficiency.

    (2) Back plating treatment

          Application scenario description: Mainly suitable for those products with relatively high tolerance for cutting edge rust. In this case, even if the cutting edge has a certain degree of rust after a period of use, it will not have a serious impact on the overall performance and service life of the product.

    Analysis of disadvantages:

          High risk of corrosion of rivets: Electroplating pickling is a critical step in the back plating process. However, the acidic solution used in this link has strong corrosion and is easy to cause corrosion to the rivets connected with the galvanized steel plate. As a connecting part, once corroded, it will weaken the strength and stability of the entire structure, bringing potential risks to the safe use of the product.

    High cost: The return plating process involves multiple complex processes and special chemicals, which makes its cost relatively high. According to statistics, the cost of return plating treatment per square meter is as high as 45 yuan. For large-scale production and processing, this will be a small expense, increasing the production cost of enterprises.

          The process is complex and complicated: the back plating treatment not only requires electroplating operation after pickling, but also a series of subsequent processes such as pressing riveting after electroplating. The whole process involves the coordination and cooperation of many links, and any problem in any link may affect the final treatment effect. Moreover, this complex process has high requirements for the technical level and operating specifications of the operators, and is prone to errors and quality problems.

    (3) Self-drying paint spraying (such as WD40 anti-rust oil)

    Advantages: The self-drying paint has the characteristics of rapid film formation, and can be naturally dried and formed a protective film in a short time after spraying to the edge of the galvanized steel plate. This rapid film forming feature makes it have certain advantages in some production environments with high time requirements, which can provide timely protection for cutting edges and reduce production delays caused by waiting for drying time.

    Shortcomings revealed:

          Volatiles are not environmentally friendly: self-drying paint will evaporate some organic compounds during the drying process, and these volatiles may cause certain harm to the environment and human health. With the continuous improvement of environmental awareness, this environmentally friendly characteristics are more and more concerned and limited, in some places with strict environmental requirements, such as food processing, medical and health fields, the use of self-drying paint has been greatly restricted.

         Hinder electrical conductivity and subsequent processing: Similar to manual painting, the oil film formed by self-drying paint will also affect the electrical conductivity of galvanized steel. In addition, in the follow-up processing, the oil film will also cause interference to the process of screen printing and labeling, resulting in a decline in product quality.

2. material improvement: high corrosion resistance galvanized sheet

     (1) Zinc, aluminum and magnesium coated steel plate

          Characteristics analysis: By adding Al and Mg elements on the basis of galvanized steel plate, a coating with special properties is formed. This coating can significantly enhance the self-healing properties of the cutting edge, and can automatically repair and restore its protective properties even after a certain degree of damage or in a more severe corrosive environment. Therefore, zinc-aluminum-magnesium coated steel plate is particularly suitable for use in those environments with harsh corrosion conditions, such as Marine environment and chemical pollution areas.

          Application case show: Japan Nippon Steel is recommended to use Zn-Al paint to repair cutting edges in practical applications. The salt spray test shows that the corrosion resistance of the cut edge repaired with this coating is significantly improved. After long-term exposure in salt spray environment, the cutting edge of Zinc-aluminum-magnesium coated steel plate shows better corrosion resistance compared with the cutting edge treated by traditional protection methods, and effectively extends the service life of the product.

    (2) aluminum-zinc coated plate

          Advantages: The alloy layer of aluminum-zinc coated plate has a dense structure and can provide good protective properties for galvanized steel plate. This dense alloy layer can effectively prevent the external corrosive medium from contacting the surface of the steel plate, thereby slowing down the occurrence of corrosion.

          Description of protection requirements: Although the alloy layer of aluminum-zinc coated plate has high protective properties, in some special cases, such as heat dissipation holes, stamping damage and other parts, additional protective measures are still needed. This is because the structure of these parts is relatively weak and easy to be eroded by corrosive media. In order to solve this problem, the bite and roll design can be used to minimize the bare area of the cut edge, and at the same time, silicone or phytic acid anti-rust solution can be applied to these exposed areas to further improve its protective effect.

3, new anti-rust agent and process

    (1) Special rust inhibitor (neutral/water-based formula)

    Advantages present:

          Efficient and convenient: When using special anti-rust agent, just soak or spray the galvanized steel sheet directly after drying to complete the protective treatment. This simple and direct mode of operation greatly improves work efficiency, especially for large-scale production and processing. Compared with traditional manual painting methods, it can save a lot of time and labor costs.

          Does not affect the electrical conductivity: The special rust inhibitor adopts a neutral or water-based formula, which will not have any effect on the electrical conductivity of the galvanized steel plate during the formation of the protective film. This makes it have broad application prospects in the field of electronic equipment manufacturing, which has strict requirements for electrical conductivity, and can ensure the normal operation of electronic equipment.

          Compatible with subsequent processes: the anti-rust agent has good compatibility and will not affect subsequent spraying, mounting and other process operations. In the production process, the galvanized steel plate can be treated with rust prevention first, and then other surface decoration and assembly work can be carried out, which improves the flexibility and convenience of production.

    Cost analysis: The cost of special rust inhibitor is relatively low, about 12-15 yuan /kg. Moreover, due to its water-based formulation, it can cover a large area after dilution, which further reduces the cost of use per unit area. Compared with the traditional protection methods such as electroplating, it has obvious economic advantages.

    (2) Cold galvanized paint

          Application scenario list: Cold galvanized coating is widely used in highway guardrail, welding nut repair and color steel plate end protection and other fields. In these application scenarios, cold galvanized coatings can provide good protection for metal surfaces, effectively preventing metal rust and corrosion.

          Effect verification: Through the cyclic salt spray test, the cold galvanized coating can significantly extend the service life of the cutting edge. After being exposed to salt spray for a long time, the cut edge treated with cold galvanized coating shows excellent corrosion resistance, and its protection effect is obviously better than the traditional protection method.

4, comprehensive suggestions

    (1) Give priority to material upgrading

          Zinc-aluminum-magnesium plate or aluminum-zinc coated plate, as a representative of high corrosion resistance galvanized sheet, has excellent corrosion resistance and self-healing properties. In scenarios with high product protection requirements, the preferred use of these two materials can reduce the risk of rust on the cutting edge and improve the quality and reliability of the product. For example, in some high-end equipment manufacturing, automobile manufacturing and other industries, the durability and safety of the product is extremely high, the use of zinc aluminum magnesium plate or aluminum coated zinc plate cutting protection is an ideal choice.

    (2) Recommended efficient protection schemes

          In actual production, it is recommended to use special rust inhibitor or cold galvanized coating as a protection scheme for cutting edges. These two new protective materials and methods can take into account efficiency, cost and environmental protection while ensuring the protection effect. They can not only improve production efficiency, reduce production costs, but also in line with modern environmental protection concepts, is the future direction of galvanized steel cutting protection.

    (3) Avoid the limitations of traditional technology

          Although manual painting and backplating still have some application value in some specific situations, in general, they are only suitable as a temporary or low-cost alternative. In the pursuit of high quality, high efficiency and environmental protection in modern production, we should try to avoid over-reliance on these traditional processes, and actively explore and apply new protection technologies and methods.