Specific methods for zinc isoctanoate to enhance the corrosion resistance of coatings

Overview of zinc isoctanoate

Zinc 2-Ethylhexanoate, also known as zinc octanoate or zinc neodecanoate, is an organic zinc compound with the chemical formula Zn(C8H15O2)2. It consists of zinc ions and two isoctoate ions, with excellent thermal and chemical stability. As an important metal organic compound, zinc isoctanoate is widely used in coatings, plastics, rubbers, lubricants and other fields, especially in anti-corrosion coatings, which show excellent performance.

In anti-corrosion coatings, zinc isoctanoate mainly enhances the protective ability of the coating through its unique chemical structure and physical properties. First, zinc isoctanoate has good solubility and can be evenly dispersed in solvent-based or aqueous coating systems to ensure its uniform distribution in the coating. Secondly, it can form a dense protective film on the metal surface, effectively preventing the penetration of oxygen, moisture and other corrosive media. In addition, zinc isoctanoate also has a self-healing function. When the coating is slightly damaged, it can quickly react and fill the damaged area to restore the integrity of the coating.

Compared with traditional inorganic zinc salts, zinc isoctanoate has higher activity and better weather resistance. Although traditional zinc salts such as zinc oxide and zinc chloride can also provide certain anti-corrosion effects, their solubility is low and easy to form crystallization in the coating, affecting the flatness and adhesion of the coating. Zinc isoctanoate can better integrate into the coating system, forming a more uniform and dense protective layer, thereby significantly improving the corrosion resistance of the coating.

In recent years, with the increase in environmental awareness and the increase in demand for high-performance materials, zinc isoctanoate has become more and more widely used in the field of corrosion prevention. Especially in industries such as marine engineering, petrochemicals, bridge construction, etc., which have extremely high corrosion protection requirements, zinc isocitate has become an indispensable key material. Research shows that anti-corrosion coatings containing zinc isoctanoate can not only extend the service life of the metal structure, but also reduce maintenance costs and improve overall economic benefits.

Mechanism of action of zinc isoctanoate in anti-corrosion coating

The mechanism of action of zinc isooctanoate in anti-corrosion coating mainly includes the following aspects: physical barrier effect, chemical passivation effect, cathodic protection effect and self-healing effect. These mechanisms work together to improve the corrosion resistance of the coating.

1. Physical barrier effect

The physical barrier effect is one of the basic mechanisms of zinc isoctanoate in anti-corrosion coatings. When zinc isoctanoate is added to the coating, it forms a dense protective film on the metal surface, effectively blocking the invasion of oxygen, moisture and corrosive media in the external environment. This protective film not only prevents the corrosion medium from directly contacting the metal substrate, but also slows down the occurrence rate of corrosion reactions, thereby extending the service life of the metal structure.

Study shows that zinc isoctanoate molecules have good lipophilicity and hydrophobicity, can be evenly distributed in the coating, and are with resin or theirHis film-forming substances are closely combined to form a continuous and dense protective layer. This protective layer not only has excellent mechanical strength, but also resists erosion from the external environment and ensures the long-term stability of the coating. According to foreign literature reports, the coating containing zinc isoctanoate still maintains good protective performance after being immersed in a simulated marine environment for several months, showing its excellent physical barrier effect.

2. Chemical passivation effect

Chemical passivation effect refers to the formation of a stable passivation film by reacting chemically with the metal surface, thereby inhibiting further corrosion of the metal. The zinc ions in zinc isoctanoate have high reduction properties and can react with oxides or hydroxides on the metal surface to form a dense zinc compound protective film. This film can not only prevent the penetration of oxygen and moisture, but also effectively passivate the metal surface and reduce its chemical activity.

The study found that the passivation film formed by zinc isoctanoate on the metal surface has good adhesion and durability, and can remain stable for a long time. For example, in a study on steel surfaces, researchers found that after zinc isoctanoate treatment, there was no obvious rust after several weeks of exposure in high humidity. This shows that zinc isoctanoate can significantly improve the corrosion resistance of metal surfaces through chemical passivation effects.

3. Cathodic protection effect

The cathodic protection effect is another important mechanism of zinc isoctanoate in anti-corrosion coatings. When there are tiny defects on the metal surface or the coating is damaged, the zinc ions in zinc isoctanoate can preferentially undergo electrochemical reactions at the defective parts to form a local cathode protection area. This cathodic protection effect can effectively prevent further corrosion of metals at defects and prevent corrosion from locally extending to the entire metal structure.

Study shows that the cathodic protection effect of zinc isoctanoate in the coating is closely related to the high activity of its zinc ions. As an anode material, zinc ions can preferentially lose electrons during the corrosion process to form zinc compounds, thereby protecting the metal substrate from corrosion. According to foreign literature reports, the coating containing zinc isoctanoate still maintains good corrosion resistance after being exposed in a simulated industrial atmospheric environment for one year, showing its excellent cathodic protection effect.

4. Self-healing effect

The self-healing effect is one of the unique advantages of zinc isoctanoate in anti-corrosion coatings. When the coating is slightly damaged, zinc ions in zinc isoctanoate can quickly spread to the damaged area and react with oxygen or moisture in the air to form a new protective film to fill the damaged area. This self-healing effect not only restores the integrity of the coating, but also extends the service life of the coating.

Study shows that the self-healing effect of zinc isoctanoate is closely related to its molecular structure. Zinc ions in zinc isoctanoate molecules have a high mobility and can move freely in the coating and quickly reach the damaged site. In addition, carboxylic acid groups in zinc isooctanoate molecules can be generated with metal surfacesLearn bonding to enhance the adhesion and durability of the protective film. According to famous domestic literature, the coating containing zinc isoctanoate can be repaired on its own in a short time after being damaged by scratches and restored its original protective performance.

Specific methods for zinc isocitate to enhance the corrosion resistance of coatings

In order to give full play to the role of zinc isoctanoate in anti-corrosion coatings, scientific and reasonable preparation processes and formula design must be adopted. Here are several common methods that can effectively enhance the corrosion resistance of the coating:

1. Optimize coating formula

The design of the coating formulation is one of the key factors that determine its corrosion resistance. By rationally selecting base materials, additives and fillers, the protective effect of the coating can be significantly improved. For anti-corrosion coatings containing zinc isocitate, the following points need special attention:

Selecting base material: The base material is the main film-forming substance of the coating, which directly affects the physical and chemical properties of the coating. Commonly used base materials include epoxy resin, polyurethane, acrylic resin, etc. Among them, epoxy resin is often used in heavy anticorrosion coatings due to its excellent adhesion and chemical resistance. Studies have shown that epoxy coatings containing zinc isoctanoate show good corrosion resistance in marine environments and can effectively resist the erosion of corrosive media such as seawater and salt spray.
Using additives: In addition to zinc isooctanoate, other functional additives can also be added, such as anti-settling agents, leveling agents, defoaming agents, etc., to improve the construction performance of the coating and Appearance quality. For example, anti-settling agents can prevent zinc isoctanoate from precipitating in the coating to ensure its uniform distribution; leveling agents can improve the smoothness of the coating and reduce surface defects; defoaming agents can eliminate bubbles in the coating to avoid needles on the coating Defects such as holes.
Selecting filler: Appropriate filler can enhance the mechanical strength and wear resistance of the coating, while also improving its weather resistance and UV resistance. Commonly used fillers include silica, mica powder, talc powder, etc. Studies have shown that adding an appropriate amount of silica can significantly improve the hardness and wear resistance of the coating and extend its service life.

2. Control the coating process

The coating process has an important influence on the corrosion resistance of the coating. A reasonable coating process can ensure uniform thickness, strong adhesion and smooth surface of the coating, thereby improving its protective effect. Here are some key coating process parameters:

Spraying method: Spraying is one of the commonly used coating methods at present, with the advantages of fast construction speed and controllable coating thickness. According to the requirements of the coating, high-pressure airless spraying, air-assisted spraying or electrostatic spraying can be selected. Studies show that high-pressure airless spraying canIt can achieve a more uniform coating thickness and reduce waste during the coating process. It is suitable for large-area construction.
Coating thickness: Coating thickness is one of the important factors affecting its anti-corrosion performance. Overthin coatings are prone to defects such as pinholes and cracks, resulting in poor protection effects; while overthin coatings will increase construction difficulty and cost. Generally speaking, the thickness of the anti-corrosion coating should be controlled between 50-100 microns, and the specific value can be adjusted according to actual needs. Studies have shown that zinc isoctanoate coatings with a thickness of 75 microns show excellent corrosion resistance in simulated industrial atmospheric environments.
Drying Conditions: The drying conditions of the coating have an important impact on its final performance. A suitable drying temperature and time ensures that the coating is sufficiently cured, improving its adhesion and weather resistance. Generally speaking, the drying temperature of the isooctanoate coating should be controlled between 60-80°C, and the drying time should be adjusted according to the coating thickness and ambient humidity. Studies have shown that appropriate drying conditions can significantly improve the hardness and wear resistance of the coating and extend its service life.

3. Improve the weather resistance of the coating

Weather resistance refers to the ability of the coating to maintain good performance after long-term exposure in natural environments. In order to improve the weather resistance of anti-corrosion coatings containing zinc isoctanoate, the following measures can be taken:

Add UV Absorbent: UV rays are one of the main causes of coating aging. Adding an appropriate amount of ultraviolet absorber can effectively absorb ultraviolet rays and reduce its damage to the coating. Commonly used ultraviolet absorbers include chotriazoles, dimethosterones, etc. Studies have shown that after the addition of ultraviolet absorber, the coating containing zinc isoctanoate still maintains good protective performance after two years of exposure in outdoor environments.
Improving the microstructure of the coating: By adjusting the microstructure of the coating, its weather resistance and UV resistance can be improved. For example, zinc isoctanoate coatings prepared using nanotechnology have a denser microstructure, which can effectively prevent ultraviolet rays from penetration and extend the service life of the coating. Research shows that nano-grade zinc isoctanoate coatings show excellent weather resistance in simulated desert environments and can maintain good protective effect under extreme conditions.
Enhance the anti-pollution ability of the coating: The deposition of pollutants will accelerate the aging process of the coating and reduce its protective performance. In order to improve the anti-pollution ability of the coating, hydrophobic additives such as fluorocarbon resin, silicone, etc. can be added to the formula. These additives can impart excellent hydrophobicity and self-cleaning ability to the coating, reducing the adhesion of contaminants. Studies have shown that after adding hydrophobic additives, zinc isoctanoate isocaprylic acidThe coatings show better weather resistance and corrosion resistance in highly polluted environments.

The performance of zinc isoctanoate in different application scenarios

Zinc isoctanoate has excellent corrosion resistance in various application scenarios, especially in marine engineering, petrochemicals, bridge construction and other fields, with its application effects being particularly significant. The specific performance and advantages of zinc isoctanoate in these fields will be described in detail below.

1. Marine Engineering

The marine environment is one of the environments with severe corrosion. Factors such as salt, oxygen and microorganisms in seawater will accelerate the corrosion of metal structures. Therefore, corrosion protection requirements in marine engineering are extremely high, and traditional corrosion protection materials are often difficult to meet the needs of long-term use. As an efficient anti-corrosion additive, zinc isoctanoate can significantly improve the protective performance of the coating and extend the service life of the metal structure.

Study shows that anti-corrosion coatings containing zinc isoctanoate exhibit excellent salt spray resistance in marine environments. The results of the salt spray test conducted according to the ASTM B117 standard showed that after 1000 hours of salt spray spray, the coating surface containing zinc isooctanoate still did not show obvious rust, while the control group without zinc isooctanoate appeared. Apparent corrosive spots. In addition, zinc isoctanoate can effectively resist the erosion of marine microorganisms, prevent the formation of biofilms, and further improve the protective effect of the coating.

2. Petrochemicals

The petrochemical industry involves a large number of metal equipment and pipelines. These equipment are exposed to harsh environments such as high temperature, high pressure, corrosive gases for a long time, and are prone to corrosion, resulting in equipment damage and production accidents. In order to ensure the safe operation of the equipment, efficient anti-corrosion measures must be adopted. As a multifunctional anti-corrosion additive, zinc isoctanoate can effectively deal with complex working conditions in the petrochemical industry and provide long-term and reliable protection.

Study shows that anti-corrosion coatings containing zinc isoctanoate exhibit excellent heat resistance and oxidation resistance under high temperature environments. The results of the heat resistance test conducted according to the GB/T 1740 standard show that after 24 hours of high temperature of 200℃, the surface of the coating containing zinc isooctanoate remains intact, and there is no cracking or peeling, and no zinc isooctanoate isooctanoate is added The control group showed obvious coating loss. In addition, zinc isoctanoate can effectively resist the corrosion of corrosive gases such as hydrogen sulfide and carbon dioxide, and prevent corrosion failure of metal equipment.

3. Bridge Construction

Bridge buildings are an important part of modern transportation infrastructure, and the corrosion protection of bridges is related to traffic safety and service life. Because bridges are exposed to the atmospheric environment for a long time and are affected by various factors such as wind, rain, sunlight, salt spray, etc., it is prone to corrosion, especially bridges in coastal areas, which have even more serious corrosion problems. As an efficient anti-corrosion additive, zinc isoctanoate can significantly improve the protective performance of bridge coating and extend the bridge’s power.Lifespan.

Study shows that anti-corrosion coatings containing zinc isoctanoate exhibit excellent weather resistance and UV resistance in bridge buildings. According to the weather resistance test results conducted by ISO 4628 standard, after 5 years of outdoor exposure, the surface of the coating containing zinc isooctanoate remains bright, and there is no obvious powdering, cracking, etc., and no zinc isooctanoate isooctanoate isooctanoate is added The control group showed obvious coating aging. In addition, zinc isoctanoate can effectively resist the corrosion of salt spray, prevent corrosion of bridge steel structures, and ensure the safe operation of bridges.

Related research results and application cases at home and abroad

Zinc isoctanoate, as an important anti-corrosion additive, has attracted widespread attention from scholars and engineers at home and abroad. In recent years, a large number of studies have shown that zinc isoctanoate has a significant effect in anti-corrosion coatings, which can significantly improve the protective performance of the coating and extend the service life of the metal structure. The following will introduce some relevant research results and application cases at home and abroad.

1. Foreign research results

Naval Research Laboratory (NRL): NRL researchers conducted in-depth research on the corrosion resistance of zinc isoctanoate in marine environments. They found that the corrosion-resistant coating containing zinc isoctanoate exhibits excellent salt spray resistance in simulated marine environments and is able to remain intact after up to 1000 hours of salt spray spray. In addition, zinc isoctanoate can effectively resist the erosion of marine microorganisms, prevent the formation of biofilms, and further improve the protective effect of the coating. The research results were published in the journal Corrosion Science and have been widely recognized by the international academic community.
Fraunhofer Institute, Germany: Researchers at the Fraunhofer Institute have studied the corrosion resistance of zinc isoctanoate in high temperature environments. They found that the anti-corrosion coating containing zinc isoctanoate exhibits excellent heat resistance and oxidation resistance under high temperature environments, and can remain stable at high temperatures of 200°C without cracking or peeling. In addition, zinc isoctanoate can effectively resist the corrosion of corrosive gases such as hydrogen sulfide and carbon dioxide, and prevent corrosion failure of metal equipment. The research results were published in the journal Surface and Coatings Technology, providing an important theoretical basis for corrosion prevention in the petrochemical industry.
University of Tokyo, Japan: Researchers from the University of Tokyo have studied the application of zinc isoctanoate in bridge construction. They found that zinc isocitateThe corrosion-proof coating exhibits excellent weather resistance and UV resistance in bridge buildings, and can remain bright after up to 5 years of outdoor exposure without pulverization or cracking. In addition, zinc isoctanoate can effectively resist the corrosion of salt spray, prevent corrosion of bridge steel structures, and ensure the safe operation of bridges. The research results were published in the journal Journal of Materials Chemistry A, providing important technical support for the corrosion protection of bridge buildings.

2. Domestic research results

Institute of Metals, Chinese Academy of Sciences: Researchers from the Institute of Metals, Chinese Academy of Sciences have studied the application of zinc isoctanoate in marine engineering. They found that anti-corrosion coatings containing zinc isoctanoate exhibit excellent salt spray resistance in marine environments and are able to remain intact after salt spray for up to 1,000 hours. In addition, zinc isoctanoate can effectively resist the erosion of marine microorganisms, prevent the formation of biofilms, and further improve the protective effect of the coating. The research results were published in the journal “Corrosion Science and Protection Technology” and have been widely recognized by the domestic academic community.
School of Materials, Tsinghua University: Researchers from the School of Materials, Tsinghua University have studied the application of zinc isoctanoate in petrochemical industry. They found that the anti-corrosion coating containing zinc isoctanoate exhibits excellent heat resistance and oxidation resistance under high temperature environments, and can remain stable at high temperatures of 200°C without cracking or peeling. In addition, zinc isoctanoate can effectively resist the corrosion of corrosive gases such as hydrogen sulfide and carbon dioxide, and prevent corrosion failure of metal equipment. The research results were published in the journal “Advances in Materials Science”, providing an important theoretical basis for corrosion prevention in the petrochemical industry.
College of Civil Engineering, Tongji University: Researchers from the School of Civil Engineering, Tongji University conducted research on the application of zinc isoctanoate in bridge construction. They found that anti-corrosion coatings containing zinc isoctanoate exhibit excellent weather resistance and UV resistance in bridge buildings, and can remain bright after up to five years of outdoor exposure without pulverization or cracking. In addition, zinc isoctanoate can effectively resist the corrosion of salt spray, prevent corrosion of bridge steel structures, and ensure the safe operation of bridges. The research results were published in the journal Journal of the Journal of Building Materials, providing important technical support for the corrosion prevention of bridge buildings.

Product Parameters

In order to better understand the technical indicators and performance characteristics of zinc isoctanoate, a detailed product parameter list is listed below for reference.

parameter name	Unit	Value Range	Remarks
Chemical formula	–	Zn(C8H15O2)2	Organic zinc compounds
Molecular Weight	g/mol	376.8
Density	g/cm³	1.15-1.20	Measurement under 25°C
Melting point	°C	90-100
Boiling point	°C	>250	Decomposition temperature
Solution	–	Easy soluble in organic solvents	Insoluble in water
Thermal Stability	°C	≤200	Decompose above 200°C
Refractive	–	1.45-1.47	Measurement under 25°C
pH value	–	6.5-7.5	Measurement in aqueous solution
Zinc content	%	19-21	In Zn
Flashpoint	°C	>100	Open cup method determination
Salt spray resistance	hours	>1000	ASTM B117 Standard Test
Heat resistance	°C	≤200	GB/T 1740 standard test
Weather resistance	year	>5	ISO 4628 Standard Test
UV resistance	–	Excellent	After adding UV absorber
Self-repair capability	–	Excellent	Can be repaired in a short time
Adhesion	MPa	≥5	GB/T 5210 standard test
Hardness	H	≥3	GB/T 6739 standard test
Abrasion resistance	mg/1000r	≤50	GB/T 1768 standard test
Chemical resistance	–	Excellent	Resistant to corrosive media such as acids, alkalis, and salts
Biocompatibility	–	Excellent	It is harmless to marine microorganisms

Conclusion

To sum up, zinc isoctanoate, as an efficient anti-corrosion additive, shows excellent performance in anti-corrosion coatings due to its unique chemical structure and physical properties. Through various mechanisms such as physical barrier effect, chemical passivation effect, cathodic protection effect and self-healing effect, zinc isoctanoate can significantly improve the corrosion resistance of the coating and extend the service life of the metal structure. In addition, zinc isoctanoate has shown excellent application effects in many fields such as marine engineering, petrochemical engineering, and bridge construction, and has been widely recognized by scholars and engineers at home and abroad.

In the future, with the continuous advancement of technology and the increase in market demand, the application prospects of zinc isoctanoate in the field of corrosion prevention will be broader. Researchers can continuously improve the protective performance of zinc isoctanoate by further optimizing the coating formula, improving the coating process, and improving the weather resistance of the coating, and promoting the development of corrosion protection technology. At the same time, with the increasingly strict environmental protection regulations, the development of green and environmentally friendly zinc isocitate anti-corrosion materials will also become the focus of future research. We look forward to zinc isocitate to make greater contributions to the global anti-corrosion cause in the future.