E36 marine steel, especially marine hull steel, not only requires sufficient mechanical properties and good process performance, but also requires as high corrosion resistance as possible. Improving corrosion resistance has always been one of the main issues in the research of hull steel. . Usually, people improve the corrosion resistance of E36 marine steel by alloying, such as adding Cr, Ni, Mo and other corrosion-resistant alloying elements, but the alloying method usually greatly increases the cost of the steel, and is often used in ultra-high-strength steel.
For E36 marine steel, an effective way to improve corrosion resistance must consider the relevant cost factors. A large number of studies have shown that inclusions in E36 marine steel are the main corrosion-inducing source, and the type and shape of inclusions have a direct impact on corrosion. Therefore, the corrosion resistance of E36 hull steel can be improved by reducing the number of inclusions or changing the type and shape of inclusions. corrosion resistance performance.
The calcium treatment process is low in cost, can deoxidize, desulfurize, change the inclusions and their shapes, and improve the cleanliness of E36 hull steel. It has been widely used in the production of pipeline steel, gear steel, E36 marine steel and other steel types.
The corrosion behavior of calcium-treated E36 marine steel in distilled water containing mixed gas (H2S+CO2+SO2) was studied. The results show that the CaO and CaS inclusions formed by calcium treatment dissolve on the surface of the substrate to generate alkaline products, which increase the pH value of the surface liquid film and slow down the corrosion of the substrate in acidic environment-the effect of calcium treatment on the seawater corrosion resistance of E36 marine steel .
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