Want to know how not to be corroded, first understand why cement pipes are corroded:
To understand the cause of corrosion of cement pipes, we must first look at the composition of cement. Cement is a powdery hydraulic inorganic gelation material. After mixing with water, it will form a slurry, which can be hardened in air or better in water, and can firmly cement sand, stone and other materials together.
There is also data such as steel bars in cement pipes, so this information is an important material for improving the strength of cement pipes in concrete.
Under normal circumstances, cement pipes are laid underground for a long time. Outstanding use. But when there is corrosive medium inside or outside. Corrosion can occur, causing damage. There are various reasons for the corrosion of cement pipes, including daily sewage, industrial wastewater, and corrosive media in the soil. In recent years, due to the addition of proteins in daily sewage, the general use of synthetic detergents, the increase of water temperature, and the complexity of industrial wastewater. Whether it is a split cement pipe, a sewage pipe or a combined cement pipe, corrosion is a serious problem.
Let's look at the detailed chemical composition of the corrosive medium:
1. Corrosive medium touches cement stone in liquid phase and has a certain concentration and quantity;
2. There are components in the cement stone that cause corrosion—sodium hydroxide and calcium aluminate hydrate;
3. The cement stone itself is not dense in structure, and there are some capillary channels that can be penetrated by corrosive media.
The acidic substances and calcium hydroxide in cement will have a neutralization reaction, and the product will be loose and swollen, and it will be easily hydrolyzed and powdered when it encounters water. As a result, the concrete or plaster layer is gradually disintegrated by corrosion, so the cement should not be corroded by acids. Where acidic materials or containers are touched, acid-resistant mortar and acid-resistant concrete should be used. Slag cement, pozzolan cement and fly ash cement all have better acid resistance, and these three types of cement should be used in preference to make acid-resistant mortar and concrete. Projects that strictly require resistance to acid corrosion are not allowed to use general cement.
Corrosion of cement pipes is also closely related to the cause of the product itself.
For example, slow corrosion, because it is slow and difficult to be detected by the inspectors. This kind of damage is very large. Another is stress corrosion cracking, which is a phenomenon of pipeline cracking caused by the effects of corrosion, tension and stress. The damage is greater. The most terrible thing is the danger of cracks when leaving the factory. The reason is the least simple to grasp.
In addition, if the cement has the following problems, mainly including circular chisels and dents with circular chisels, these are usually caused by mechanical loss. Such a damage-forming portion is thinner than other portions and is more easily corroded.
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