Advantages and disadvantages of the hottest zinc a

2022-09-23
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Advantages and disadvantages of zinc alloy hinge and 304 stainless steel hinge

the diversity and convenience of surface treatment methods greatly enrich the appearance of hinge, reduce production costs at the same time, and make high-quality and low-cost hinge possible

3. During melting and die casting, there is no iron absorption, no corrosion of molding, and no die sticking

lower requirements for processing equipment and environment, which greatly saves production costs

4. It has good mechanical properties and wear resistance at room temperature

5, low melting point, melting at 385 ℃, easy to die cast

1. Poor corrosion resistance

can also carry out 1000 hours of continuous experiments

2. Poor weather resistance

3. The most common defect surface blistering

causes:

1 Caused by pores: it is mainly caused by pores and shrinkage mechanism. Pores are often round, while shrinkage is mostly irregular

(1) causes of pores:

a during the filling and solidification of molten metal, holes are generated on the surface or inside of the casting due to gas intrusion

b the gas volatilized from the paint invades

c the air content of the alloy liquid is too high, and the cement is separated out by the electric bending machine during solidification. When the gas in the mold cavity, the gas volatilized by the coating, and the gas precipitated by the solidification of the alloy,

when the mold exhaust is poor, it will eventually remain in the pores formed in the casting

(2) causes of shrinkage cavity:

a during the solidification of molten metal, shrinkage cavity is generated due to the reduction of volume or the lack of feeding of molten metal at the last solidification part

b uneven thickness of castings or local overheating of castings cause slow solidification of a certain part, and the surface becomes concave when the volume shrinks. Due to the existence of pores

and shrinkage cavities, the holes may enter water during surface treatment of die castings. When baking after painting and electroplating, the gas in the holes

will expand by heating; Or the water in the hole will become vapor and expand in volume, resulting in blistering on the surface of the casting

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 are good, and there is no heat treatment hardening phenomenon (service temperature -196 ℃ - 800 ℃). It is corrosion-resistant in the atmosphere. If it is an industrial atmosphere or heavily polluted area, it needs to be cleaned in time to avoid corrosion. Suitable for food processing, storage and transportation. It has good machinability and weldability. Plate heat exchangers, corrugated pipes, household goods (the handling charges for the surrender of class 1 and 2 tableware, cabinets, indoor pipes are calculated according to the proportion of the extracted account value of lines, water heaters, boilers, bathtubs), auto parts (windshield wipers, silencers, molded products), medical appliances, building materials, chemistry, food industry, agriculture, ship parts, millet, etc. 304 stainless steel is a nationally recognized food grade stainless steel

304 stainless iron steel hinge has a considerable improvement in corrosion resistance and weather resistance compared with zinc alloy hinge. It is a good supplement to the deficiency of zinc alloy hinge

the zinc alloy hinge has a variety of surface physical and chemical processes and rich products. The production process, especially the high molecular data, has developed rapidly in recent years. The technology is simple and the cost is low. Under the normal temperature and climate conditions, it has good mechanical properties and wear resistance. On the whole, it is economical and practical, and can meet most of the needs

304 stainless steel hinge has good corrosion resistance and weather resistance. Compared with zinc alloy hinge, the mechanical properties are also significantly improved, the production process is more complex, the surface treatment process is relatively simple, and the price is relatively expensive

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