As large facilities exposed to the marine environment for a long time, ships face extremely complex corrosion problems. In order to ensure the durability, safety and beauty of ships, the application of anti-corrosion paint is particularly important. Marine anti corrosion paint can not only effectively prevent the corrosion of metal substrates, but also increase the service life of ships and reduce maintenance costs. Marine anti corrosion paints are of various types and complex ingredients. How to choose and apply them is related to the long-term stability and operational efficiency of ships.
This article will introduce the ingredients of marine anti corrosion paint and different types of marine anti corrosion paint in detail to help ship engineers, maintenance personnel, and ship managers understand the importance and selection strategy of anti-corrosion paint.
What are the ingredients of marine anti corrosion paint?
Marine anti corrosion paint is a paint specially designed to prevent corrosion in the marine environment. Its ingredients include various chemicals such as resins, pigments, solvents, fillers and additives. Each ingredient has different functions and characteristics. They work together to enable the paint to achieve anti-corrosion, wear resistance, UV resistance, hydrolysis resistance and other effects.
1. Resin
Resin is one of the main ingredients of marine anti corrosion paint, which determines the adhesion, durability and surface hardness of the paint. Resin acts as a binder in the coating, which firmly binds pigments, fillers and other ingredients together to ensure the stability of the coating.
● Epoxy resin: Epoxy resin is one of the most commonly used anti-corrosion coating resins, which has excellent adhesion, chemical resistance and corrosion resistance. Epoxy resin coatings are generally used on the bottom and waterline of ships, and can effectively resist seawater, chemicals and oxidation.
● Polyurethane resin: Polyurethane resin has strong wear resistance and is often used to coat the upper part of the hull. It can effectively prevent ultraviolet rays from damaging the coating and extend the service life of the coating.
● Acrylic resin: Acrylic resin has good weather resistance and is often used in ship superstructures and deck coatings. It can maintain its gloss and color under long-term exposure to sunlight.
2. Pigment
Pigment is a solid component in marine anti-corrosion paint. Its main function is to provide color and hiding power for the paint. Different types of pigments have different functions, such as providing anti-corrosion protection and enhancing the wear resistance and hardness of the coating.
● Zinc powder: Zinc powder is a common anti-corrosion pigment with good cathodic protection. Zinc powder can form a dense metal film, which effectively isolates moisture and oxygen and prevents corrosion of the substrate. Paints with high zinc content are mostly used for corrosion protection near the bottom and waterline of ships.
● Chromates: Chromates have strong corrosion resistance and are widely used in anti-corrosion coatings on steel and aluminum alloy surfaces.
● Iron red and titanium dioxide: Iron red and titanium dioxide are mainly used for coloring and shielding of paints, enhancing the anti-corrosion effect and improving the weather resistance of paints.
3. Solvents
Solvents play a role in diluting and adjusting the viscosity of paints in marine anti corrosion paints. The addition of solvents can adjust the fluidity and construction properties of paints. The type and proportion of solvents directly affect the drying speed, glossiness and ease of use of paints.
● Alcohol solvents: such as ethanol, isopropanol, etc., are suitable for some quick-drying paints and environmentally friendly paints.
● Ketone solvents: such as acetone, methyl ethyl ketone, etc., have good solubility and are used to adjust the consistency of paints and improve construction effects.
● Aromatic hydrocarbon solvents: such as xylene, which are often used in some high-solid content coatings and have good solubility.
4. Fillers
Fillers are inorganic or organic solid particulate matter. Common fillers include silica, talc, bauxite, etc. They can not only increase the volume and solid content of the coating, but also improve the hardness, wear resistance and adhesion of the coating.
Inorganic fillers: such as silicon powder and aluminum powder, increase the anti-aging ability and hardness of the coating.
Organic fillers: such as resin microbeads, can improve the elasticity and toughness of the coating.
5. Additives
Additives are some chemical substances with specific functions, usually added in a very low proportion in marine anti corrosion paint to enhance the characteristics of the coating.
● Anti-ultraviolet additives: mainly used to improve the anti-ultraviolet ability of the coating and prevent the coating from fading or aging under long-term exposure to sunlight.
● Anti-hydrolysis additives: improve the water resistance of the coating in a humid environment and prevent the coating from peeling.
● Leveling agent: improve the fluidity of the coating and prevent bubbles or brush marks during painting.
What types of marine anti corrosion paint are there?
Marine anti corrosion paint can be divided into many types according to different functions and usage requirements. Each type of paint provides corresponding protection measures for different corrosion environments. The following are several common types of marine anti corrosion paint.
1. Zinc-based anti-corrosion paint
Zinc-based anti-corrosion paint is the most common type of marine anti corrosion paint, especially suitable for the bottom and waterline of ships. Zinc powder paint can effectively prevent metal corrosion through sacrificial anode action.
● Features: Zinc-based paint has strong cathodic protection ability. When the coating is damaged, zinc powder can protect the substrate through electrochemical reaction to prevent corrosion from spreading.
● Application: Commonly used for the bottom of the hull, waterline and other metal surfaces that are often in contact with water and oxygen.
2. Epoxy anti-corrosion paint
Epoxy marine anti corrosion paint is based on epoxy resin and has strong adhesion, corrosion resistance and chemical stability. Epoxy paint is usually used for anti-corrosion protection of ship structures and equipment surfaces.
● Features: Epoxy paint has excellent water resistance, oxidation resistance and acid and alkali resistance, and is suitable for long-term protection in marine environments.
● Application: It is mostly used for anti-corrosion of hulls, decks, engine rooms, pipelines and other parts.
3. Polyurethane anti-corrosion paint
Polyurethane marine anti corrosion paint has good weather resistance and UV resistance while having anti-corrosion properties. It is widely used for the protection of ship superstructures, decks, and exposed parts.
● Features: Polyurethane paint has strong wear resistance and is suitable for hull parts exposed to the sun, and can effectively prevent aging problems caused by ultraviolet rays.
● Application: It is suitable for ship superstructures, decks and decorative coatings.
4. Acrylic anti-corrosion paint
Acrylic marine anti corrosion paint is often used for decorative protection of ship surfaces, and has good weather resistance and gloss. It can not only prevent metal corrosion, but also provide beautiful appearance.
● Features: Acrylic paint has good UV resistance and is suitable for surfaces exposed to the sun, and can maintain the color and gloss of the coating for a long time.
● Application: Mainly used for ship superstructures, decks and anti-corrosion outer coatings.
5. Chlorinated rubber anti-corrosion paint
Chlorinated rubber marine anti corrosion paint has good water resistance and chemical corrosion resistance, and is often used in the waterline, bottom and engine room of ships.
● Features: Chlorinated rubber paint has very strong water resistance and is suitable for use in environments with long-term contact with seawater.
● Application: Used for anti-corrosion protection on the bottom of the hull, waterline and other humid environments.
How to choose a suitable marine anti corrosion paint?
Choosing a suitable marine anti corrosion paint requires comprehensive consideration based on multiple factors. First of all, you need to understand the use environment of the ship, the durability requirements of the paint, the construction method, and the subsequent maintenance requirements.
1. Use environment
The use environment of the ship is crucial to the selection of paint. For example, the degree of corrosion of ships in tropical and cold environments is different, and the type of marine anti corrosion paint required is also different. In addition, ships near heavily polluted port areas and near chemical transportation have more special anti-corrosion requirements.
2. Paint performance
Different types of marine anti corrosion paint have different performance characteristics. For example, epoxy coatings are suitable for highly chemically corrosive environments, while polyurethane coatings are more suitable for areas exposed to sunlight for a long time. Consider the coating's wear resistance, UV resistance, acid and alkali resistance, etc., and choose the most suitable coating.
3. Ease of construction
Different types of marine anti corrosion paint also have different requirements during construction. The construction of epoxy coatings and zinc-based coatings requires more stringent surface preparation, while polyurethane and acrylic coatings are relatively easier to apply. Choose the most suitable product according to the construction cycle of the ship and the construction requirements of the coating.
Can Huaren Chemical provide eco-friendly paint options?
Yes, Huaren Chemical Industry Co., Ltd. offers eco-friendly, water-based industrial paints that meet the latest environmental standards. These coatings are perfect for businesses looking for sustainable solutions without compromising on quality. As a leading manufacturer, we can provide both eco-friendly options and customized products to meet your unique requirements.
