Many people know that wood is prone to corrosion during use, so anti-corrosion treatment is necessary. A common method is to use carbonization for wood preservation. However, there is a relatively special type - railway sleepers, which undergo high-temperature and high-pressure oil immersion treatment to prevent corrosion and waterproof properties of the wood. So, can these two be stacked together? The so-called "superposition" refers to whether the carbonized wood can be further subjected to high-temperature and high-pressure oil immersion treatment? If possible, will the anti-corrosion performance also be correspondingly superimposed?

Let's first talk about what carbonized wood is. Carbonized wood refers to the process of carbonizing the original wood in a high-temperature environment, usually by burning it with flames. This process will rearrange the cell structure in the wood, causing most of the cell structure to be destroyed and the pore area of the wood to become smaller. To put it simply, it means burning the wood until it feels a bit sticky, making it impossible for fungi and insects to survive. This treatment method improves the physical properties of wood and has a better anti-corrosion effect than untreated wood.

The railway sleepers mentioned above are also known as "anti-corrosion sleepers", "oil immersed sleepers", "oil injected sleepers", etc. As the name suggests, we can know that the anti-corrosion method of this type of wood is very special - it uses anti-corrosion oil to immerse into the interior of the wood at high temperature and pressure to achieve the purpose of anti-corrosion. In the windy and sunny environment on the railway, the anti-corrosion ability of wood is a great test. Moreover, the sleepers also need to withstand the pressure from the train to ensure the safety and stability of railway transportation. If only wood is carbonized, the service life of carbonized sleepers will be greatly reduced compared to oil immersed sleepers.

Returning to the main topic, can carbonized wood undergo oil immersion anti-corrosion treatment again?

Sure, but it's not necessary.

There's nothing impossible, it's just that we need to know that the pores in carbonized wood become smaller and the water absorption decreases. This means that the ability of carbonized wood to absorb moisture is greatly reduced. Therefore, if carbonized wood is to be treated with anti-corrosion oil, it may be found that the wood cannot fully absorb enough anti-corrosion oil, and even cannot penetrate at all.

If we apply oil immersion treatment to carbonized sleepers, it can be understood that the anti-corrosion performance is slightly better than carbonized sleepers, but it will be lower than oil immersed sleepers. So it can be concluded that the anti-corrosion performance of carbonized sleepers after oil immersion treatment will not be superimposed.

There is actually no fixed answer to whether carbonized wood needs to be soaked in anti-corrosion oil. In practical applications, comprehensive considerations need to be made based on specific situations.