Speaking of aluminum alloy, everyone must be familiar with it. Indeed, aluminum alloy is a very common and important material in our daily lives. It is an alloy substance that plays a vital role in our daily lives. Many people know that there are many aluminum alloys in their homes, but they often do not understand its characteristics and precautions when using them. To this end, this article will introduce to you the characteristics of aluminum alloy and precautions for use, so that you can make reference when needed.
Features
1. Relatively large proportion.
2. It has good casting performance and can die-cast precision parts with complex shapes and thin walls, and the surface of the castings is smooth.
3. Surface treatment can be carried out: electroplating, spraying, painting, polishing, grinding, etc.
4. It does not attract iron during melting and die-casting, does not corrode the mold, and does not stick to the mold.
5. It has good mechanical properties and wear resistance at room temperature.
6. It has a low melting point and melts at 385°C, making it easy to die-cast.
Precautions
1. Poor corrosion resistance.
When the impurity elements lead, cadmium, and tin in the alloy composition exceed the standards, the castings will age and deform, manifesting as volume expansion, significant decrease in mechanical properties, especially plasticity, and even rupture over time.
Lead, tin, and cadmium have very little solubility in zinc alloys, so they are concentrated at the grain boundaries and become the cathode. The aluminum-rich solid solution becomes the anode. In the presence of water vapor (electrolyte), crystallization is promoted. electrochemical corrosion. Die castings age due to intergranular corrosion.
2. Aging effect
The structure of zinc alloy is mainly composed of zinc-rich solid solution containing Al and Cu and Al-rich solid solution containing Zn. Their solubility increases with the decrease of temperature. reduce. However, due to the extremely fast solidification rate of die castings, the solubility of the solid solution is greatly saturated at room temperature. After a certain period of time, this supersaturation phenomenon will gradually be relieved, causing the shape and size of the casting to change slightly.
3. Zinc alloy die castings should not be used in high and low temperature (below 0°C) working environments. Zinc alloy has good mechanical properties at room temperature. However, the tensile strength at high temperatures and the impact properties at low temperatures decrease significantly.
4. Zinc alloy die-casting parts will have burrs on the surface due to problems such as insufficient clamping force, poor mold closing, insufficient mold strength, and too high melt temperature. This phenomenon is called product burrs, and often It is a post-processing process that enterprises must face. It is mainly solved by manual polishing, hydrogen-oxygen explosion and Zhaoling freezing shot blasting machine according to the nature of the product.
Through the above introduction, we have roughly Understand the characteristics of aluminum alloy and some precautions when using it. From this we can see that aluminum alloy has many advantages, including good castability, high plasticity, etc. These characteristics determine its wide range of applications. When using aluminum alloy, please note that aluminum alloy has poor corrosion resistance, so it should not be used in high or too low temperatures to avoid reducing its life due to improper use environment or methods.
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