Views: 5 Author: Site Editor Publish Time: 2020-03-27 Origin: Site
Seamless aluminum tube has the characteristics of economy, environmental protection and stability, so it can be used in many harsh conditions. Due to the characteristics of the working environment and its applications, we have to pay attention to the corrosion of seamless aluminum tube.
Here is the content list:
Seamless Aluminum pipe corrosion protection For Marine
Seamless Aluminum pipe corrosion protection For Underground
Seamless Aluminum pipe corrosion protection For Gas
The advantages of seamless aluminum tube are small specific gravity, strong thermal conductivity, excellent mechanical properties, good machinability. But the oxide film formed by itself is difficult to resist the corrosion of the application environment, and its corrosion resistance must be improved by proper surface treatment.
Sacrificial anode protection
Simply put, the corrosion of the anode of seamless aluminum tube is used to protect the cathode and slow down the corrosion rate of the cathode. At the same time, it should be noted that we should choose metal not too active, or it will be easy to lead to alkali corrosion of seamless aluminum tube.
Because the bottom of the boat and the surface of the corrosion part of the different, so the choice of spray material to seamless aluminum tube should be different.
Underwater seamless aluminum tube corrosion is mainly the penetration of seawater, water corrosion is mainly atmospheric aging.
Underwater seamless aluminum tube corrosion protection can be achieved by means of sacrificial anode protection, while water is sprayed with anti-corrosion materials. This requires that the anticorrosive materials have good aging resistance, good luster and decorative.
This is a new technology in recent years, through the combined action of electrochemistry and thermochemistry, forming ceramic oxide film on the surface of aluminum tube.
The microarc oxidation process introduces the working area from the ordinary anodic oxidation Faraday area to the high voltage discharge area, overcomes the defect of rigid anodic alumina tube, and greatly improves the comprehensive performance of the film layer. The micro-arc oxidation film is firmly combined with the aluminum tube, with compact structure, high toughness, and good wear resistance, corrosion resistance, high temperature impact resistance, electrical insulation and other characteristics.
According to the different corrosive properties of soil, the structure of anticorrosive coating for seamless aluminum tube can be divided into three types: ordinary anticorrosive coating, reinforced anticorrosive coating and extra-reinforced anticorrosive coating. Ordinary anticorrosive coating is suitable for soil with slight corrosion, reinforced anticorrosive coating is suitable for soil with severe corrosion, and extra-reinforced anticorrosive coating is suitable for soil with extreme corrosion.
Steel wire brush is mainly used to do polishing to the seamless aluminum tube surface, remove becomes loose or warps the scale, the rust, the welding slag and so on. Manual tool rust removing can reach Sa2 level, power tool rust removing can reach Sa3 level, for aluminum tube surface adhesion firm corrosion, if the tool rust removing effect is not ideal, can use pickling rust removing or jet rust removing method.
Long-term, safe and stable operation is the primary task of natural gas transmission pipeline, and the harm of seamless aluminum tube corrosion environment is an important factor that directly affects the working reliability of the seamless aluminum tube. So how to prevent the corrosion damage of buried seamless aluminum tube has long been an important link in pipeline engineering.
Outer wall corrosion Protection
Painting: Grease paint, alkyd resin paint, vinyl perchloride paint, nitrocellulose paint and so on.
Organic compound material: Pitch, plastic, resin and so on.
Inorganic compound material: Glass, enamel, cement and so on.
For example, the structure designed to prevent residual moisture corrosion, to avoid the connection between different metals and aluminum pipes, to remove the welding stress, to improve the environment, and to pay special attention to the uniformity of the soil layer in direct contact with the aluminum pipe when backfilling the aluminum pipe trench.
Add aluminum tube corrosion inhibitor.
The addition of trace or small amounts of these chemicals can significantly reduce the corrosion rate of aluminum tubes in natural gas. At the same time, it can keep the original physical and mechanical properties of the aluminum tube unchanged. The rational use of corrosion inhibitor is an effective method to prevent the corrosion of aluminum tube in environmental media.
This paper introduces three kinds of anticorrosion methods for seamless aluminum tubes. If you want to know more about seamless aluminum tube corrosion method, welcome to visit our website, we will serve you wholeheartedly.