The basic function of painting is to prevent corrosion. Corrosion in shipbuilding reduces the quality of the material. Thickly rusted plates, for example, will lose their strength. If the rust then falls off, a hole can form. That is the guarantee of safety against the load decreases.
Painting protects the ship from a corrosive environment. In buildings that are always exposed to seawater, such as the hull of a ship below the waterline, painting also aims to prevent the growth of moss or barnacles.
Moss and barnacles can stick to the hull plate below the waterline which is always submerged in seawater. The gastric plate becomes rough. The longer they are exposed to seawater, the thicker the barnacles stick to. The thickness of the barnacles can be an obstacle that reduces the speed of the ship while sailing.
In old buildings, painting is a treatment. Can be in the form of daily routine maintenance, or maintenance during docking.
As routine maintenance, rusty buildings, such as decks, are tapped, repaired, then painted. At the time of docking, barnacles in the hull are scraped, sandblasted, painted anti-corrosion (AC), then painted anti-fouling (AF)
Painting: Prevents corrosion and attachment of marine animals.
Outbuildings painting area
There are three painting areas on the outside of the ship’s construction:
The area below the waterline is constantly submerged in seawater.
1. Areas at the waterline and above the waterline that are not continuously submerged in seawater.
2. Superstructure (superstructure).
3. Areas below the waterline that are continuously submerged in seawater
Particularly susceptible to corrosion and growth of marine organisms such as mosses and barnacles. Painting this area is very special and is usually done when the ship is in the dock (docking).
Areas of the waterline and above the waterline that are not continuously submerged by seawater, but are often eroded by the impact of seawater when the sea is choppy, including being susceptible to corrosion.
The superstructure (superstructure) is not directly exposed to seawater, but to air containing seawater vapor. Corrosion is also easy if the building is not protected by paint.
In daily maintenance activities, if there is a change of material, such as a pipe or plate, the part is immediately painted. At least the base is painted first. The goal is to prevent oxidation or rust.
Painting stages
Painting on the ship is usually done through the following stages:
1. Base paint (primary coat)
2. Middle paint (intermediate coat)
3. Final paint (finish coat)
Primery Coat: The work area is not directly painted with a finish coat. Always coated with a primer (primary coat) first. The term used on ships is dimeni. After the new layer of dry meni coated with final paint.
Primer coat has the following properties:
- As a paint base because it has good adhesion to the next layer of paint.
- As anti-rust.
Intermediate Coat: Middle paint or intermediate coat. Sometimes a certain thickness is required to be watertight. For this purpose, a middle coat or intermediate coat is used. This paint must adhere well to the primer coat.
Finish Coat: The final paint or finish coat is the outermost protector. This paint protects the material from corrosion and prevents the attachment of marine animals
Types
As mentioned above, paint serves to protect against corrosion and a decrease in the strength of the material. In general, based on the specifications, the types of paint used on ships are:
1. Primary
2. Anti Corrosion (AC)
3. Anti Fouling (AF)
4. bottom
5. topside
6. Deck paint
Primary.
This is a base paint. Useful for coating the very beginning (bare metal). This paint can be used as a paint base and at the same time anti-rust, has a strong adhesion to the next layer of paint.
Anti Corrosion (AC).
As the name suggests, this paint acts as a corrosion inhibitor. This paint is classified as a primary paint from the resin family.
Anti Fouling (AF).
This is anti-barnacle paint. Used on the lower hull of the ship, from the keel to the waterline, that is, the part that is continuously submerged in seawater. This part is very often plastered with moss and barnacles
Bottom (bottom-top).
This paint is used:
1. after anti-corrosion paint (AC)
2. in the waterline area and the top of the line that is not always submerged in seawater.
Topside.
This type of paint is used to paint the top of the ship’s construction. This paint is weather resistant.
Deck paint. From the name it is clear, this paint is used for painting ship decks.
Paint color meaning
Another function of painting, related to certain colors, is to mark the designation, for example on pipes. On the ship, especially in the engine room, you will see a view of pipes with different colors: red, green, blue, yellow, white, silver. The colors show their respective designations.
RED= Fire fighting
BLUE= Freshwater pipe
GREEN= Seawater pipe
BROWN= Fuel/diesel oil
YELLOW=Lubricating oil
BLACK= Bilges
SILVER= Exhaust gas
WHITE= Air pipe
Need more information About Ship Painting and other Coatings Jobs? please contact Alltech coatings, a Professional painting Contractor based in Australia.
Website: https://alltechcoatings.com.au
Email: info@alltechcoatings.com.au
Phone: (07) 3139 8012
