[China Aluminum Industry] Zinc Alloy Hinge Material Properties:
1. Good casting performance. It can die-cast complex and thin-walled precision parts. The casting surface is smooth.
This feature also creates a variety of zinc alloy hinge styles to meet our various personalized installation needs.
2, can be surface treatment: plating, spraying, painting, polishing, grinding and so on.
The versatility and convenience of surface treatment greatly enriches the appearance of hinges, while reducing production costs, making it possible to make affordable hinges.
3, melting and die-casting does not attract iron, corrosion pressure type, non-stick mode.
The processing equipment and the environment are less demanding, which greatly saves production costs.
4, there is a good room temperature mechanical properties and wear resistance.
5, low melting point, melting at 385 °C, easy to die-cast molding.
insufficient
1, poor corrosion resistance
2, and weather resistance is not strong
3, the more common defects surface foaming
cause:
1. Caused by holes: Mainly pores and contraction mechanisms, pores are often round, and most shrinkage is irregular.
(1) Causes of stomata:
a During the filling and solidification process of the molten metal, due to gas intrusion, holes are created on the surface or inside of the casting.
b The gas invaded by the coating invades.
c The alloy contains too much gas and precipitates when solidified. When the gas in the cavity, the gas that the coating volatilizes, the gas that the alloy solidifies,
In the case of poor exhaust of the mold, pores formed in the casting are stopped.
(2) Causes of shrinkage:
a During the solidification process of the molten metal, shrinkage occurs due to the shrinkage of the volume or the lack of liquid metal in the later solidified part.
b. Partial overheating of castings or castings with uneven thickness results in slower solidification in one part and recession in the surface when volume shrinks. Due to pores
With the presence of shrinkage cavities, the holes may enter the water when the die casting is subjected to surface treatment. When baking is performed after painting and plating, the holes
The gas in the cave is thermally expanded; or the water in the pores will become vapor and expand in volume, which will cause the surface of the casting to foam.
304 stainless steel hinge material characteristics:
As a widely used steel, it has good corrosion resistance, heat resistance, low-temperature strength and mechanical properties; stamping, bending and other hot workability, no heat treatment hardening (use temperature -196 °C -800 °C). Corrosion resistance in the atmosphere, if industrial atmosphere or heavily polluted areas, it needs to be cleaned in time to avoid corrosion. Suitable for food processing, storage and transportation. With good processing properties and weldability. Plate heat exchangers, bellows, housewares (1, 2 tableware, cabinets, indoor pipes, water heaters, boilers, bathtubs), auto parts (windshield wipers, mufflers, molded products), medical appliances, building materials, chemicals, food industry , Agriculture, ship parts, millet phones, etc. 304 stainless steel is a nationally recognized food grade stainless steel.
304 stainless steel steel hinges have a considerable improvement in corrosion resistance and weather resistance relative to zinc alloy hinges. Good supplement to the lack of zinc alloy hinges.
to sum up:
Zinc alloy hinges and surface treatment processes are diverse, products are abundant, the production process is simple, and the cost is low. Under the normal temperature and climate conditions, there are good mechanical properties and wear resistance. Overall, economic and practical can meet most of the needs.
304 stainless steel hinge, good corrosion resistance, with weather resistance. Compared with zinc alloy hinges, mechanical properties are also significantly improved, the production process is more complicated, the surface treatment process is relatively simple, and the price is relatively expensive.
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