Anti-corrosion Treatment Technology Of Port Machinery

The number of port machinery and equipment and its operational stability are important factors that affect port throughput and production efficiency. There are many types of port equipment, including frontier, horizontal transportation, yard equipment, etc. The main material of domestic port machinery equipment is Q345 steel, which is affected by the port’s salt spray environment and is highly susceptible to corrosion, which affects the overall safety and stability of the equipment. For this reason, the port machinery equipment management department must pay attention to the application of equipment anti-corrosion treatment technology to improve the maintenance quality and life of the equipment.

1. Anticorrosive coatings commonly used in port machinery and equipment

First, aliphatic acrylic polyurethane topcoat. This kind of coating has good advantages in weather resistance, and has strong applicability in anti-corrosion coating of steel structure. It is a commonly used topcoat for port machinery and equipment;
Second, the middle paint. The use of intermediate paint is mainly to enable better adhesion between the coatings and to establish a better protective structure for mechanical equipment. Generally speaking, in the anti-corrosion treatment of port machinery and equipment, the intermediate paint used is epoxy mica. This intermediate paint can increase the diffusion area of ​​corrosive factors, reduce the water permeability of the coating, and improve the anti-corrosion performance;
Third, epoxy zinc phosphate primer. Primer is a key component of anti-corrosion coatings, and its quality is related to anti-corrosion performance. The main raw material of epoxy zinc phosphate primer is zinc phosphate. After a series of chemical reactions, zinc oxide is easily formed, which improves anti-corrosion performance and has high adhesion. , Low requirements for coating technology; fourth, workshop primer. The commonly used type of workshop primer is inorganic zinc silicate workshop primer. Its anti-corrosion quality, heat resistance, tensile resistance and solvent resistance are obviously strong, and the coating efficiency is extremely high.

2. Analysis of anti-corrosion treatment technology for port machinery and equipment 　

2.1 Coating system for port machinery and equipment

First, the internal surface anticorrosive coating system. In the process of anti-corrosion coating of port machinery and equipment, the internal surface coating is very important. In addition, the internal surface structure of these machines is complex and requires high coating technology. Therefore, it is relatively simple to choose epoxy zinc-rich; for the inner surface of the closed box structure equipment, the thickness of the epoxy zinc-rich primer is 50 ~ 80um; for the non-closed internal surface space, the epoxy zinc-rich + ring is generally used Oxygen intermediate paint coating.
Second, the exterior surface anticorrosive coating system. In the anti-corrosion treatment, the outer surface of the machine has always been the focus, and the combination of zinc-rich primer + polyurethane top coat + epoxy intermediate paint is usually used. Compared with steel, the electrode potential of zinc powder is relatively low, and the electrochemical reaction of zinc in the steel medium will lose electrons, thereby effectively protecting the steel. The use of inorganic zinc-rich and iron-zinc alloys can improve the anti-corrosion ability of the structure; and the intermediate paint usually uses high-solid epoxy coatings to strictly control the volume solids. Among them, the protoplasmic epoxy coating produced by GEC has a solid content of 80%, which can effectively shorten the hard-drying time and is widely used in the anti-corrosion treatment of the outer surface of port machinery.
Third, the anticorrosive coating system for galvanized parts and stainless steel parts of port machinery. In port machinery and equipment, many railings and handrails are made of galvanized materials. When designing the required anti-corrosion coatings, the strong adhesion of the coating must be considered; and stainless steel parts account for a larger proportion in port machinery and equipment, and its own It has strong corrosion resistance, but because its working environment has been in the coastal chloride ion for a long time, its corrosion is obvious, so it must be treated with anti-corrosion coating. For the anticorrosive coating of galvanized parts and stainless steel parts, the coating thickness can be appropriately reduced, and the color of the topcoat should also be selected according to relevant standards. Specifically, the topcoat uses an aliphatic polyurethane topcoat with a thickness of 50～80um; epoxy zinc phosphate is used as a primer, and the thickness is controlled at 75-100um.

2.2 Using zinc plus anti-corrosion protection method

Compared with traditional paint protection, zinc plus protection has strong coating protection and cathodic protection. Compared with the traditional zinc-rich primer, the corrosion resistance of zinc plus protection is more than 5 times, and the anti-corrosion protection period is longer, which can reach about 30 years. Generally speaking, in the anti-corrosion of steel structure, zinc coating includes electrolytic zinc powder, organic resin, volatile solvent and so on. The concentration of pure zinc in the zinc plus dry film is above 96%, which can satisfy the cathodic protection of steel materials. After the zinc coating is oxidized, a protective barrier of zinc salt layer will be formed on the surface to delay the oxidation time. In addition, the zinc coating and the surface of the steel structure have high mechanical bonding performance, even if ordinary damage occurs, it will not affect its performance
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2.3 Electrochemical and water-soluble anti-rust oil anti-corrosion system　

The so-called electrochemical anti-corrosion method mainly penetrates through the pinholes of the coating. After the moisture and oxygen penetrate the anti-corrosion coating, they will electrochemically react with the anti-rust pigment in the anti-corrosion coating, and finally generate anti-corrosion ions. When the moisture in the anti-corrosion ion reaches the metal surface, it will make the surface potential of the steel structure higher and avoid the dissolution of iron ions. For example, chromate pigments have the above properties, or they can be protected by metals with a lower potential than steel electrodes, including the zinc-rich coatings mentioned above.
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Water-soluble anti-rust oil. Usually machine oil, gasoline, kerosene are used as solvents, mainly products derived from petroleum fractionation. The D.K8 water-solvent anti-rust oil that uses water as a solvent does not contain aluminum or aromatic hydrocarbons, and has less waste discharge during production, and can achieve significant anti-rust effects, which meets the current environmental protection requirements of relevant national appraisal departments.

3. Conclusion

Through the above analysis, it can be known that the anti-corrosion treatment effect of port machinery and equipment is related to the quality of port engineering, and the safety and efficiency of port operation. Therefore, it is necessary to strengthen the research on relevant anti-corrosion treatment technologies, clarify the anti-corrosion process and responsibilities, and improve the quality of integrated management.

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