Shipbuilding steel is exposed to complex marine environments for long periods, and enhancing its corrosion resistance is of utmost importance.
Alloying treatment serves as a fundamental measure. Adding elements such as chromium (Cr) and molybdenum (Mo) can not only increase the electrode potential but also form a dense passive film. For instance, chromium can significantly enhance the corrosion resistance of steel in various media, and molybdenum further strengthens the passivation effect. Optimizing the microstructure should not be overlooked either. A single - phase structure can reduce micro - batteries. Reducing the carbon content and impurities can avoid adverse effects. Calcium treatment can purify the molten steel, and processes like grain refinement can prevent the penetration of corrosive liquids.
Improving the processing technology is equally crucial. During steelmaking, rationally adjusting the elements and precisely controlling the rolling and cooling processes can enhance the inherent corrosion resistance of the steel. Protective measures, on the other hand, act as external safeguards. Whether it is applying corrosion - resistant coatings or using metal composite plates, they can effectively isolate the steel from corrosive media.
In the era of rapid technological development, by leveraging new technologies such as "big data" and "artificial intelligence" to establish intelligent methods for corrosion resistance design and control, we can not only develop high - performance corrosion - resistant steel but also conduct real - time monitoring of the steel during its service life. These efforts comprehensively enhance the corrosion resistance of shipbuilding steel, safeguarding the safety and long - term operation of ships.