The quality of the coating is directly related to the performance and service life of the processed products.
The quality of the coating is related to the performance indicators of the processed products and the performance of the hot-dip galvanized layer during the service life.
Inspection and analysis of the characteristics of the hot-dip galvanized layer of the mechanical equipment is an essential stage in the galvanizing process of the mechanical equipment. Therefore, at this stage, the quality of the coating is There are two methods of identification: one is to let the lock parts undergo actual evaluation in the environment in which they are used. This is a more accurate method, but the test time is long and cannot be carried out at all; the other is to simulate the environment in which the plated parts are used. Standard or selective measurement of some important physical and chemical properties (such as coating thickness, corrosion resistance of the coating, etc.) under the environment, and then analysis of the tested physical and chemical technical parameters to identify the coating quality. The second method is commonly used in the surface engineering industry. Although this method cannot allow us to obtain the specific service status of a coating in the application environment, it can enable us to distinguish the coating to a certain extent. The quality of the layer method and the short test cycle can guide production in a timely manner.
The mechanical hot-dip galvanizing process is different from phosphating and hot-dip galvanizing. It has only been used in industrial production since the early 1980s, while the electro-galvanizing process has been used in industrial production in the early 19th century. Hot-dip galvanizing The processing technology was successfully used for industrial production in the middle and late 18th century. Up to now, the quality inspection and identification of phosphating layers and hot-dip galvanizing layers have been implemented or referred to by many standards and specifications in various countries around the world, and certain physical and chemical properties of the coating (such as thickness, quality, cell properties, etc.) or certain There are often standards for reference implementation of certain types of production and processing products (such as power line mountain products, hardware, steel bars for concrete bonding, etc.), and hot-dip galvanizing of machinery and equipment currently only has a few standards that countries around the world can follow. "Therefore, , In view of some physical and chemical performance parameters of the hot-dip galvanized layer of mechanical equipment or the quality inspection of the hot-dip galvanized layer of mechanical equipment of some unique parts, the relevant product quality standards of the hot-dip galvanized layer should be generally referred to based on actual conditions.
For hot-dip galvanized layer or zinc-based multi-layer coating, its main function is to resist corrosion in the active environment. Therefore, coating thickness, combined strength, porosity, and corrosion resistance are important indicators that determine the quality of the coating. This chapter will analyze the physics and chemistry of mechanical hot-dip galvanizing layers from these aspects. characteristic.
