How to prevent corrosion of steel hull

Rust is the collective enemy of various ships. The hull steel is exposed to air and sea water, if no measures are taken, it will soon be rusted and scrapped. The corrosion of hull steel is mainly divided into chemical and electrochemical situations. The location and type of steel rust on ships are different. There are roughly three types: thin rust, thick rust, and spot rust. How should the hull be protected?

We must first understand which parts of the ship are prone to rust, so that we can effectively detect it and take measures.
1. The outer plates and their welds and rivets between the light and heavy load lines.
2. The outer plate under the water hole.
3. The outer plate and rudder plate near the propeller.
4. The submarine valve box and its adjacent outer plate.
5. The outer plates and welds frequently rubbed by the chain, as well as the wall plates and bottom plates of the chain cabin.
6. The top plate, skeleton and components in the fore and aft compartments of the ballast tank.
7. Deck in the kitchen, bathroom, cold storage, battery room, etc.
8. The two sections of the superstructure and the bottom of the coaming around the deckhouse and the nearby deck.
9. Steel components at the sewage ditch and sewage well.
10. The surrounding steel plate through which the steam pipeline passes.

In order to prevent the steel hull from rusting, the most commonly used on the ship is to coat the protective layer to reduce the contact of the hull steel with air and moisture. Once rust is found, the corresponding rust removal methods shall be adopted according to the different degrees and parts of the rust. The general rust removal methods include manual rust removal, mechanical rust removal, partial rust removal, large area rust removal (whitening), railing rust removal and chain derusting.