What are the properties of powder sherardizing products
Sep. 24, 2020
What are the properties of powder sherardizing products
The performance of powder sherardizing products is good. In summary, they have the following characteristics:
Strong corrosion resistance. Practice has proved that in various environments such as marine atmosphere and harsh industrial atmosphere, the corrosion resistance of the sherardizing layer is better than that of thermal, electrogalvanized and stainless steel. In the same industrial atmosphere, stainless steel corrodes for 600 days, and the surface is covered with rust spots, while the sherardizing product corrodes for more than 1,600 days without any rust on the surface.
Good wear resistance and scratch resistance. The surface hardness of the sherardizing layer can reach Hv250-400, while the surface of the hot and electro-galvanized parts is pure zinc, and the coating hardness is only about Hv70, so the sherardizing is much better than hot and electro-galvanized in wear resistance and scratch resistance.
Production is basically pollution-free. In general, the pretreatment of sherardizing production only uses shot blasting machine to remove rust and oil, and use cloth bags to remove dust. In the production, oil fuel is used as the main energy source, and the cyclic combustion smokeless emission technology is adopted. The powder sherardizing technology is zinc solid infiltration. No zinc vapor is generated. The workpiece and the auxiliary agent are infiltrated and separated in a closed appliance, which has no impact on the surrounding environment. Pollution.
Zinc consumption is relatively low. It is understood that the zinc consumption per ton of hot-dip galvanizing is about 100 kilograms, while powder sherardizing is only about 30 kilograms, accounting for only 30% of the hot-dip galvanizing.
Compound protection can be achieved after painting. The sherardizing layer of the sherardizing product is uniform and the bonding force with the paint is the first level, and the corrosion resistance of the composite protective layer is better than the hot, electrogalvanized and sherardizing layers.
The steel parts treated by sherardizing do not affect the mechanical properties of the material. The temperature of sherardizing treatment is 100～280℃ lower than that of hot-dip galvanizing. At this temperature, the hydrogen atoms absorbed into the steel matrix have diffused and escaped. Therefore, there is no hydrogen embrittlement hazard in the application, and it can also avoid the drawbacks of some high-strength parts such as springs that cause mechanical performance degradation due to high processing temperatures.
