Zinc alloys are alloys based on zinc and added to other elements. Commonly added alloying elements are aluminum, copper, magnesium, cadmium, lead, titanium, and the like. Zinc alloy is currently the most widely used material in the smart lock industry. What are its advantages and disadvantages?
1. Advantages of zinc alloy smart lock.
1) The casting performance is good, and the precision parts with complex shape and thin wall can be die-casted, the casting surface is smooth, the pattern is diverse, and the selectivity is high;
2) Various surface treatments such as electroplating, spraying, painting, etc. can be performed, and the colors are diversified;
3) have good mechanical properties and wear resistance at room temperature;
4) The melting point is low, melting at 385 ° C, easy to die-cast molding, style, shape:
5) The cost is relatively low, and the price is slightly lower than the stainless steel smart lock.
2. The disadvantages of zinc alloy smart locks.
1) Poor corrosion resistance. When the impurity elements lead, cadmium, and tin in the alloy composition exceed the standard, the casting is aged and deformed, which is characterized by volume expansion, mechanical properties, especially plasticity, and long time and even cracking. Lead, tin and cadmium have little solubility in zinc alloys and thus concentrate on the grain boundaries to become the cathode. The aluminum-rich solid solution becomes the anode, which promotes intergranular electrochemical corrosion in the presence of water vapor (electrolyte). Die castings are aged due to intergranular corrosion;
2) Zinc alloy die-casting parts should not be used under high temperature and low temperature (below 0 °C) working environment. Zinc alloys have good mechanical properties at room temperature. However, the tensile strength at high temperatures and the impact properties at low temperatures are significantly reduced.