The advantages of aluminum alloy fasteners

We all know that aluminum is a silver-white light metal. It is malleable and malleable. It is understood that the weight of aluminum fasteners is 1/3 of the weight of similar steel fasteners, and the strength characteristics of this frequently used alloy are surprisingly good. In fact, in terms of strength-to-quality ratio, aluminum fasteners are higher than any other fasteners made of industrial and trade materials. Aluminum is not magnetizable. The thermal and electrical conductivity of aluminum is very good, about 2/3 of the conductivity of copper under the same volume. Aluminum has good processing characteristics and is easy to cold forming and hot forging.

Commodities are often made into rods, flakes, foils, powders, ribbons and filaments. It can form an oxide film to prevent metal corrosion in humid air. Aluminum powder and aluminum foil can burn violently when heated in the air and emit a dazzling white flame. Easily soluble in dilute sulfuric acid, nitric acid, hydrochloric acid, sodium hydroxide and potassium hydroxide solution, insoluble in water. Aluminum is widely used for its light weight, good electrical and thermal conductivity, high reflectivity and oxidation resistance. (Guide: Explain how to reduce the chance of fastener locking)

Under normal circumstances, aluminum has sufficient corrosion resistance. And when the expected exposure environment is very harsh, its corrosion resistance can be greatly improved by anodizing. Anodizing is an electrical machining process that forms an oxide film on the metal surface. Anodizing not only enhances the ability to resist corrosion, but also enhances the ability to protect against wear and scratches. The anode coating comes in many colors for decoration and identification purposes. In atmospheric corrosion, aluminum forms a light gray oxide film on the surface. These corrosion products will not contaminate the surface of aluminum, or spread to the adjacent surface, which is different from many other metals under the effect of corrosion.

The tensile strength of pure aluminum is about 13,000psi. It is possible to increase the strength by adding a small amount of alloying elements. Aluminum alloys of 2XXX, 6XXX, and 7XXX have a good effect on heat treatment. Therefore, in fact, all threaded fasteners used for load transmission are made of these three types of aluminum alloys. There are four aluminum alloys that are almost dedicated.

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