Volatile Rust Preventive Oil
Volatile rust preventive oil, also known as solvent-based rust preventive, is a kind of smooth oil containing volatile solvents. Its secondary characteristics include the following:
1
Volatility
The solvent in volatile antirust oil has high volatility and can evaporate quickly, forming a dry and even antirust film while being piled up on the surface. That feature makes volatile antirust oil can protect the metal appearance from erosion in a short time.
2
Penetrability
The solvent of volatile antirust oil has good permeability, which can penetrate into the small cracks on the metal surface and prevent the entry of water and oxygen, thus constituting a durable antirust layer.
3
Excellent sliding performance
Volatile antirust oil not only has rust prevention, but also has excellent smoothing performance, which can reduce the friction and wear of the metal appearance and delay the use of equipment life.
Oily antirust oil
Oily antirust oil, also known as coated antirust agent, is a smoothing agent based on oil-based smoothing oil. Its secondary characteristics include the following:
1
High viscosity
Oily antirust oil is based on oil-based smooth oil and has a high viscosity, which can form an average and durable smooth film and effectively block the contact between the metal exterior and the external environment.
2
Excellent adhesion
Oil-based antirust oil has excellent adhesion, and can form a thin antirust film on the metal exterior, providing reliable protection, even in high temperature and high humidity conditions can also be linked to the invariance.
3
Scratch resistance
Oily antirust oil has excellent anti-washout performance, which can link the integrity of the antirust film under the sensation of mechanical movement and external conditions to ensure the lasting protection of the metal appearance.
Application Comparison
Volatile antirust oils and oily antirust oils play important roles in different applications.
Volatile antirust oils are often used for short-term rust prevention and temporary sheltering. They are commonly used in the storage and transportation of finished metal products, such as automotive parts, machinery and equipment, and metal workpieces. Volatile antirust oils are also used to avoid oxidation and erosion of steel during welding, cutting and cold working.
Oily antirust oils are used secondarily for long-lasting rust prevention and permanent sheltering. They are often applied to finished metal products that need to be stored for a long time, such as aircraft, ships, engineering machinery and so on. Oily antirust oils can also be used to shelter metal pipelines, mechanical parts and industrial equipment.
There are some differences between volatile antirust oil and oily antirust oil in terms of characteristics and applications.
The sheltering period of volatile antirust oil is relatively short, applicable to short-term protection. The shelter period of oily antirust oil is longer, suitable for long-lasting storage and utilization.
Volatile antirust oils have good anti-erosion performance, but the protective effect may be reduced under extreme humidity and high temperature. In contrast, oil-based rust preventive oils have more reliable anti-erosion performance in harsh conditions.
Volatile rust preventive oils have better smoothing performance, which can reduce friction and wear on the metal exterior. The smooth performance of oily antirust oil is more prominent, which is suitable for mechanical equipment requiring higher smoothness.
In recent years, nanotechnology has also begun to be applied to water-based antirust technology, which undoubtedly opens up a broad prospect for the research and application of antirust technology. Researchers have extracted highly efficient and low-toxicity antirust agents from natural plants, such as rice bran, mango peel, citrus peel, aloe vera leaf, pomegranate peel, reed, water lily, cedar, rosin, etc., or use by-products of industry and agriculture to extract antirust agents and improve antirust performance by compounding and modifying treatment, so that waste can be turned into treasure to realize the full utilization of resources. Multifunctional water-based antirust agent research and development and application is becoming a trend, such as oil removal, rust removal, “two-in-one”, oil removal, rust removal, rust prevention of three-in-one products are also increasing, they are through the emulsification of the oil layer, the rust layer of the infiltration and transformation, to play a protective role in metal products. Research and development of good rust resistance, stable nature, low price, reduce pollution, full-featured, easy to use water-based metal rust preventive agent, should be the direction of future efforts of researchers.
Translated with DeepL.com (free version)
1 Types of rust preventive agents
There are many ways to deal with steel rust prevention, but the effect of rust prevention should be considered from the time of rust prevention, corrosion environment and cost. For short-term antirust (a few months), generally use oil-based antirust agent or water-based antirust agent treatment; for medium-term antirust (a few years), generally use organic coatings (paints) for anticorrosion treatment; for long-term antirust (more than 10 years), generally use hot-dip galvanizing (or aluminum) for anticorrosion treatment. For weak corrosive environments, such as indoor environments, simple anticorrosive treatment can be used, and for strong corrosive environments, such as outdoor industrial environments and oceanic climates, heavy corrosion protection is required. The commonly used rust prevention methods for finished steel are described below:
Oily antirust agent: Oily antirust treatment also includes soft film antirust oil and hard film antirust oil.
A. Soft-film rust preventive oil: soft-film rust preventive oil is composed of mineral oil (e.g. kerosene, diesel oil, motor oil or lubricating oil), oil-soluble corrosion inhibitors (e.g. barium petroleum sulfonate, aluminum stearate) and other additives, which is characterized by simple operation and a certain antirust effect (indoor storage of rust-proof period of about 2-3 months); the characteristics of the soft-film rust preventive oil in the practical application:
1) is the end user in the use of steel, the surface of the rust prevention oil removal difficulties, need to use solvents to clean or high-pressure water cleaning, otherwise it will be on the steel surface of the subsequent processing of adverse effects;
2) It is easy to cause oil contamination to the transportation tool (such as box) during the transportation of the steel after antirust treatment;
3) is the steel production enterprises in the use of oil-based antirust agent on a large number of steel rust treatment, due to the volatility and flammability of the oil-based antirust agent, the control of the production process to bring serious safety hazards.
B. Hard film antirust oil: Hard film antirust oil is organic resin (such as raw lacquer flake, alkyd resin, polyester resin, acrylic resin, epoxy resin, etc.) dissolved in organic solvent (such as xylene, acetone, ethyl acetate, etc.), which belongs to the traditional organic coating anticorrosion treatment. Organic coating is one of the most widely used anticorrosive methods, applicable to a variety of corrosive environments in the medium and long term anticorrosive treatment. Organic coating treatment has the following characteristics:
1) compared with oil-based and water-based anticorrosion treatment, the anticorrosion time is long, can be applied to different corrosive environments, through the selection of coatings, can be adapted to outdoor industrial environments, marine environments and so on.
2) It can not be treated like water-based treatment with a large tank immersion, but only spraying and brushing. Because the organic solvent in the paint evaporates quickly and can easily cause fire and explosion, it cannot be used for large-scale construction indoors, but only in ventilated outdoor areas.
3) Due to the solvents in the paint such as xylene, butyl acetate, formaldehyde, etc. are very volatile and have a great impact on the operating workers and the environment, and working in this environment for a long time can easily cause cancer and disability. Europe and the United States have rarely used organic coatings.
4) Organic coating processing workload, high cost, generally as the ultimate product anti-corrosion and not as product processing or storage and transportation process rust prevention.
2 Water-based antirust agent
The traditional water-based antirust treatment is sodium nitrite, dichromate, etc., dissolved in water at a certain concentration to form a water-based antirust solution, which is characterized by simple operation and is suitable for short-term antirust between metalworking processes, with an antirust period of about 20 days; however, this antirust agent is highly toxic to the operator and causes serious environmental pollution.
In recent years, the traditional antirust agent is gradually replaced by environmentally friendly water-based antirust agent. The environmentally friendly water-based antirust agent developed at present has the following characteristics:
1) It is non-flammable, non-toxic and environmentally friendly, and is an environmentally friendly product;
2) Brush-coated on the surface of steel, it can form a continuous and dense protective layer to isolate the contact between oxygen and water vapor in the air and the surface of steel, so as to achieve the purpose of long-lasting antirust; in the general air environment, the antirust period can be up to more than half a year;
3) As the protective film formed is very thin and dense, it maintains the base color of the steel, and users do not need to remove it when using it, and it can be directly processed in the next step.
4) Compared with organic coating, water resistance and corrosion resistance is poor.
5) Low treatment cost.
6) Simple operation, can be soaked, sprayed, brushed and other ways to deal with.
3 Examples of environmentally friendly water-based antirust agents
Example 1
New water-based antirust agent
Using China’s abundant natural resources rosin, an environmentally friendly, economical and efficient water-based antirust agent was synthesized. Rosin at a high temperature of 165-200 oC, and maleic anhydride Diels-Alder reaction to generate maleic rosin, maleic rosin further reaction with diethanolamine, to get a yellow transparent rust inhibitor, experiments have proved that it has a good water solubility and antirust properties. This is due to its polar groups have greater affinity for metal, firmly adsorbed on the metal surface, forming a directional adsorption layer, therefore, it has excellent antirust properties.
The results show that: the cast ratio of rosin, maleic anhydride and diethanolamine is 1:0.8:2.8, a surfactant (Sipan-80) is added, and an appropriate amount of a wetting agent (glycerol) is added, and the synthesized rust preventive agent is formulated into a rust preventive water, and the concentration of the rust preventive water used is generally about 1.0% for the best effect.
Example 2
KJ water-based metal rust preventive agent
KJ water-based metal rust preventive agent is scientifically compounded with inositol hexaphosphate as the main ingredient and several other non-toxic metal corrosion inhibitors. Inositol hexaphosphate is a natural non-toxic chemical product extracted from food crops. Due to its unique molecular structure and physicochemical properties, it has a strong stinging property on metals, and when used as a metal rust preventive agent, it can form a layer of dense passivated protective film layer on the metal surface to effectively inhibit metal corrosion. The agent is suitable for inter-process and long-term rust prevention treatment of steel and various non-ferrous metals.In addition, since the passivation film formed on the metal surface by this agent has similar chemical properties with organic coatings, and has good adhesion properties with each other, it can replace the conventional phosphate treatment process before metal coating, and fundamentally solve the problem of emission pollution of heavy metals, nitrites, phosphates, etc., and the processing cost is only 2/3 of the traditional process.
KJ environmentally friendly water-based metal rust inhibitor products, tested by various parties, the rust prevention performance indicators are higher than similar traditional products, to achieve safe and non-toxic metal protection treatment in China, opened up an important way.
Example three
Environmentally friendly water-based antirust agent
With inositol hexaphosphate, acrylamide and glutamic acid as the main raw materials, an environmentally friendly water-based rust preventive agent was developed, and the optimal ratio was determined by orthogonal test, and the rust prevention time was tested, which showed that the rust preventive agent had excellent rust prevention performance. In order to improve the film-forming quality of the rust preventive agent, a polymer film-forming agent was added in it, in which the horse propylene copolymer not only made the rust preventive film more uniform, but also further prolonged the rust prevention time, so that the time of neutral salt spray test was close to 50min.
1) Nitrite-free environmentally friendly water-based rust preventive agent, which has inositol hexaphosphate, acrylamide and glutamic acid as its main components. Its optimal ratio is 1:20 (v/v) for inositol hexaphosphate, 5g/L for acrylamide and 10g/L for glutamic acid.
2) From a large number of polymer film-forming agents screened out the horse propylene copolymer and added to the rust preventive agent, significantly improving the rust preventive performance of the rust preventive agent, room temperature with which to deal with the iron sheet, can be quickly in the surface of the iron sheet to form a layer of uniform and easy-to-dry blue complex film, neutral salt spray test time exceeds the nitrite rust preventive agent.
Example four
Environmentally friendly water-based antirust liquid
A water-soluble polymer containing special functional groups is taken as the main body, and other additives or nanoparticles are added to prepare a kind of rust removing and antirust liquid used for metal surface treatment, and its antirust performance is studied. The developed water-based antirust agent has the characteristics of self-drying film formation, film toughness, denseness, etc., and meets the requirements of environmental protection. In this paper, a polymer film-forming agent is added to the water-based antirust agent to extend its antirust performance. Using the characteristics of nanoscale magnetic gelatin composite particles, such as good dispersion and strong magnetic responsiveness, we obtain the nano-composite system coating for the coating performance, so that the film formation is uniform, tough and dense.
Therefore, this water-based antirust and rust remover containing 60% phosphoric acid has the ability to remove rust and rust prevention, and has the characteristics of self-drying film, film toughness and denseness, etc., and the addition of nanoscale magnetic particles improves the adhesion of the antirust film with the metal substrate, improves the performance of the antirust film in isolation of moisture and air, and has a great potential for research.
