Galvanizing cold forming products are widely used in many fields, and their service life is affected by many environmental factors. In-depth research on performance in different environments is of great significance for reasonable material selection, optimized design and quality assurance of engineering.
Environmental factors can be roughly divided into natural environment and industrial environment. The natural environment includes atmosphere, soil, fresh water and sea water. In the atmospheric environment, humidity, temperature, sulfur dioxide content, etc. will cause different degrees of corrosion to the galvanized layer. The industrial environment is more complex, and there may be acid and alkali mist, chemical solvents, high temperature and high humidity, and various industrial waste gases, which greatly test the durability of galvanizing cold forming products.
In ordinary atmospheric environment, the galvanized layer can form a dense oxide film, which effectively blocks external corrosive media and generally provides a long period of protection, which can reach several years or even decades. However, in coastal areas, due to the high salt content in the air, the galvanized layer will accelerate corrosion and the service life may be shortened to several years. In urban areas with serious industrial pollution, such as the presence of a large amount of acidic gases such as sulfur dioxide, the zinc coating will react with acidic substances, gradually corrode, and its life will be significantly reduced.
When galvanizing cold forming products are buried in the soil, the soil's pH, humidity, air permeability, and microorganisms will affect its life. In acidic soil, the zinc coating corrodes faster; in alkaline soil, although the corrosion is relatively slow, it will also damage the product over a long period of time. For example, in some highly acidic wetland environments, galvanizing cold forming products may suffer from severe corrosion within a dozen years, while in neutral and dry soil, their service life can be greatly extended.
In fresh water, the corrosion rate of galvanizing cold forming products is relatively slow, but if the water contains certain impurities or ions, it will still accelerate corrosion. In seawater, due to the high concentration of salt and the complex electrochemical environment, the zinc coating will corrode quickly. Even after special treatment, its service life is usually only a few years, and in some harsh marine environments, it may be shorter.
In order to improve the service life of galvanizing cold forming products in different environments, a variety of methods can be used. For example, increasing the thickness of the galvanizing layer can enhance the protective ability; passivation treatment can make the surface of the galvanizing layer more stable; or alloying galvanizing can be used to improve the corrosion resistance of the coating. In addition, when designing the product, considering environmental factors, optimizing the structure, and reducing stress concentration in corrosion-prone parts can also help extend its service life.
The service life of galvanizing cold forming products in different environments varies greatly. Understanding these differences and taking corresponding protective measures can give full play to its performance advantages and ensure the long-term stable operation of related projects and products in different environments. At the same time, it also provides a basis for further material research and development and process improvement, and promotes the sustainable development of galvanizing cold forming technology in various fields.
