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The Cause Of Corrosion Of Oil Cooler
The main causes of corrosion of oil cooler are materials, environment (water quality, gas) and electrochemical reaction.
Selects the corrosion resistance of the material, is one of the important measures to prevent corrosion, and the shell and tube type oil cooler with good heat dissipation performance steel pipe production, its strong ionization tendency, will contact due to come into contact with different kinds of metal corrosion potential difference (different), for example in the positioning plate, dynamic panel and cooling copper pipe barrier often have severe corrosion phenomena. To solve this problem, one is to improve the cooling water quality, and the other is to use aluminum alloy cooling tube.
In addition, the environment of the cooling tube contains dissolved oxygen, water quality of cooling water (PH value), temperature, velocity and foreign matter. The more oxygen dissolved in water, the more intense the corrosion reaction; In the acid range, the lower the PH value, the more active the corrosion reaction, the more serious the corrosion. In the alkaline environment, the possibility of increasing corrosion with the PH value increases with the PH value. The increase of the tassel increases the amount of oxygen available on the surface of the metal, while the flow rate is too large to produce turbulent turbulence, which leads to cavitation corrosion. In addition, the sand and tiny shellfish in the water are attached to the cooling tube, which often leads to certain local corrosion.
In addition, the presence of oxygen ions increased the use of liquid conductivity, causing the corrosion electrochemical reaction increases, especially the chloride ion adsorption also will local failure protection film on stainless steel, aluminum alloy, lead to pitting corrosion and stress corrosion. General temperature increases, corrosion also increases accordingly.
The above mentioned above, in order to prevent corrosion, in cooler selection and water quality treatment should attract attention, the former is often difficult to change, but the latter operator can always think of a solution.