Publish Time: 2019-07-23 Origin: Site
As is known to all, iron pipe materials used for a long time tend to rust, so aluminum pipe will rust like iron? The answer is yes. The corrosion of aluminum extrusion tubes is characterized by white or dark gray spots, sometimes white powders appear at the corrosion site, and then develop into rust pits filled with corrosion products. As business managers, we certainly do not want this to happen, let us see why aluminum tubing rust.
Why Does Aluminum Pipes Rust?
How To Detect Oxide Film Of Aluminum Tube?
How To Prevent Rusting Of Aluminum Tube?
Since the iron pipe "laid off", aluminum pipe with its good strength, light weight, not easy to rust the characteristics of consumers. What are the causes of corrosion of metals such as aluminum pipes? Generally speaking, metal corrosion includes electrochemical corrosion and chemical corrosion.
In the process of corrosion accompanied by current corrosion, called electrochemical corrosion.
There are always some impurities in the aluminum tube. Different metals have different potentials, and different compositions in the same metal also have different potentials. When a metal comes into contact with a solution that conducts electricity, a potential difference occurs, leading to an electron flow that causes the low-potential metal in the aluminum tube to be corroded first.
In addition to the chemical properties of the aluminum tube itself, its corrosion is also closely related to the surrounding medium and the metal structure. For example, the wet environment is easier to rust than the dry environment, the aluminum pipe with more impurities is easier to rust than the one with less impurities, and the aluminum pipe with high temperature is easier to rust than the one with low temperature.
The phenomenon that metal material is damaged by chemical reaction with the external medium is called chemical corrosion.
No electric current is generated during the chemical corrosion process, which is just a simple chemical action. Oxidation of a metal surface in a normally dry atmosphere. For different metals, the structure and nature of the oxide is different, some can form a thin and stable and solid oxide film on the metal surface, so that the inner metal and the external media isolation, play a protective role, aluminum tube is one of them.
The thickness and firmness of the oxide film are the key to wear resistance and corrosion resistance of aluminum. However, because of the need for vicious price competition，many manufacturers play a trick on the oxide film, its thickness is far from the national standard requirements, some even without oxide film; At the same time, due to the use of poor raw materials, resulting in low film hardness, firmness, easy to fall off. In coastal cities, the air humidity is high, the salt is high, if the aluminum oxide film falls off or the oxide film is not enough, plus the aluminum itself purity is poor, high iron, copper and other impurities, aluminum pipe will soon occur electrochemical corrosion, leading to rust of aluminum pipes.
Therefore, the detection of oxide film is an important part during the purchase of aluminum tubes.
The surface of anodized aluminum tube is milky white, cast aluminum and mixed aluminum is gray black. The surface of the aluminum tube that did not produce oxide film shows transparent bright white, some still are attached pink or gray-black hang frost.
The surface of the aluminum tube that has generated oxide film is very hard, and it slides when using the needle to scratch, without scratches. The surface of the aluminum tube that has not generated oxide film is very soft, and there is resistance and scratches when using the needle to scratch.
Aluminum tubes with oxide film generated will make a crisp sound when being knocked, while aluminum tubes without oxide film generated will make a dull sound when being knocked.
How To Prevent Rusting Of Aluminum Tube?
1. Start from the beginning. After the production of aluminum tube, to let the aluminum coil cool after and the outside of the same temperature can only be packaged.
2. In the process of transportation on the road, must prevent rain, if it rains to be wrapped tightly with rain cloth, prohibit water coming into the products.
3. After unloading the aluminum coil, to the aluminum dealers’ side, must choose a well-ventilated, topography to a point higher warehouse. The roof should not leak, the sewer should be kept unobstructed, so as not to drain out the rain when it rains heavily.
The above is about whether the aluminum tube will rust and the analysis and treatment of its corrosion, I hope to help you. Unlike some manufacturers, our company only produces aluminum tubes with perfect oxide film. Looking forward to your cooperation with us!