1. Improve the nature of the metal (alloy treatment)

Many foreign scholars have conducted research on the influence of various alloying elements on the seawater corrosion resistance of steel. It has been discovered that alloy steels based on Cr, Ni, Cu, P, Si, and rare earths have excellent anti-corrosion properties, and a series of seawater corrosion-resistant steels have been developed on this basis. However, based on economic and technological considerations, the above elements have not been widely used in seawater corrosion-resistant steels.

2. Form a protective layer (coating non-metal or metal protective layer)

The metal protective layer is mainly for phosphating, oxidizing, and passivating the plated metal; the non-metal protective layer is mainly for coating paint, plastic, enamel, mineral grease, etc. on the metal surface to form a protective layer. The purpose of these two kinds of protective layers is to isolate the substrate from contact with seawater, instead of reacting with the seawater to form protection.

The application fields of anti-corrosion coatings mainly include the following five aspects:

①Emerging marine engineering: offshore installations, coastal and bay structures, offshore oil drilling platforms;

②Modern transportation: highway guardrails, bridges, boats, containers, trains and railway facilities, automobiles, airport facilities;

③ Energy industry: hydraulic equipment, water tanks, gas tanks, petroleum refining equipment, petroleum storage equipment (oil pipes, oil tanks), power transmission and transformation equipment, nuclear power, coal mines;

④Large industrial enterprises: papermaking equipment, medical equipment, food and chemical equipment, metal container inner and outer walls, chemical, steel, petrochemical plants, pipelines, storage tanks, mining and smelting, cement plant equipment, floors, walls, and cement components with corrosive media;

⑤Municipal facilities: gas pipelines and their facilities (such as gas tanks), natural gas pipelines, drinking water facilities, garbage disposal equipment, etc.;