The surface quality and performance of petrochemical forgings are very important in the process of manufacture and use. The choice and application of surface treatment technology not only affects the appearance of forging, but also directly relates to its key properties such as corrosion resistance and fatigue resistance. This paper aims to discuss the status quo, challenges and development trend of the surface treatment technology of petrochemical forgings, in order to provide useful reference for related enterprises and research institutions.
Common surface treatment techniques
Sandblasting: Impact the surface of the forgings by high-speed blasting sand to remove oxide, rust and stains. This method can quickly clean a large area of the surface, but may lead to increased surface roughness.
Pickling treatment: Chemical corrosion of the forging surface using an acidic solution to remove oxides and rust. Pickling treatment can obtain a smooth surface, but the pickling time and solution concentration need to be strictly controlled to avoid excessive corrosion.
Mechanical polishing: The surface of the forging is mechanically ground with abrasive or polishing cloth to reduce surface roughness and improve gloss. This method is suitable for forgings with high surface finish requirements, but the cost is higher.
Plating treatment: A layer of metal or alloy is plated on the surface of the forging to improve its corrosion resistance, electrical conductivity or decorative properties. Electroplating can give forgings a variety of functions, but need to control the thickness and uniformity of the coating.
Chemical conversion film treatment: A dense chemical conversion film is formed on the surface of the forging through a chemical reaction to improve its corrosion resistance. Common chemical conversion films include phosphating, oxidation and passivation. This method can improve the corrosion resistance of forgings to a certain extent, but it needs to control the processing conditions and film thickness.
The challenge and development trend of surface treatment technology
Environmental protection: Traditional surface treatment technologies such as pickling and electroplating may produce waste liquid and exhaust gas during the treatment process, causing pollution to the environment. Therefore, the development of environmentally friendly surface treatment technology is an important trend of future development. For example, environmentally friendly treatment methods such as chromium-free passivation and water-based coatings are studied to reduce the negative impact on the environment.
Functionality: With the development of the petrochemical industry, the functional requirements for forging surfaces are getting higher and higher. For example, forgings with special properties such as resistance to high-temperature oxidation and resistance to hydrogen sulfide corrosion are needed. Therefore, the research and development of surface treatment technology with specific functionality is an important direction in the future.
Intelligent: The introduction of automation and intelligent technology to achieve automatic monitoring and optimal control of the surface treatment process, improve production efficiency and product quality stability. For example, the use of machine learning and artificial intelligence technology to optimize processing parameters and process routes to achieve intelligent production.
Composite treatment: A variety of surface treatment technologies are combined to give full play to their respective advantages and achieve synergistic effects. For example, sandblasting is performed first to remove oxidation and stains, followed by chemical conversion film treatment to improve corrosion resistance. This composite treatment method can further improve the surface quality and performance of forgings.
Personalized customization: Provide personalized surface treatment solutions to meet the specific use environment and performance requirements for different customers and application scenarios. This requires companies to work closely with customers to develop surface treatment technologies tailored to specific needs.
The surface treatment technology of petrochemical forgings is of great significance for improving product quality and service life. This paper discusses the common surface treatment techniques, their advantages and disadvantages, and points out the challenges and development trends. In the future, with the continuous progress and innovation of science and technology, the surface treatment technology of petrochemical forgings will be continuously improved and improved to provide a strong guarantee for the sustainable development of the petrochemical industry.
