Corrosion protection agents Manufacturers online

Corrosion inhibitors play an important role in protecting metal surfaces from environmental influences such as moisture, chemicals and mechanical wear.

They are used in various industries to extend the service life of components, machines and structures.

Below is an overview of how corrosion protection agents work, their effects and types, as well as an overview of their use and the sustainability and environmental aspects of their use:

How corrosion inhibitors work:

Corrosion is the chemical or electrochemical reaction of a metal with its environment, resulting in damage or decomposition. The most common forms are:

1. Rust (iron oxidation) - caused by oxygen and water.
2. Acid corrosion - caused by aggressive chemicals.
3. Pitting corrosion - selective material destruction.
4. Stress corrosion - caused by mechanical stress and chemical reaction.

Corrosion inhibitors work by:

1. Forming a protective layer, e.g. through coatings or inhibitors.
2. Chemically slowing down the corrosion process.
3. Changing the environmental conditions to prevent corrosion.

Types of corrosion inhibitors & their mechanisms:

Physical protection - Barrier formation:

This involves applying a protective coating to the metal surface to prevent contact with corrosive substances.

1. Coatings and paints:
Protective layer of plastic, lacquer or special paints.
Used in the automotive, mechanical engineering and construction industries.
Examples: Powder coatings or epoxy resin paints.

2. Oils and waxes:
Form a water-repellent film.
Ideal for temporary protection during storage or transportation.
Examples: Corrosion protection oil, wax sprays.

3. Galvanic coatings:
Metallic coatings such as zinc, nickel or chrome.
Galvanizing protects steel components through a sacrificial anode effect.
Example: Hot-dip galvanizing of steel beams.

Chemical protection - reaction protection:

This method chemically alters the metal surface to make it more resistant to corrosion.

1. Passivation:
Formation of an inert oxide layer through chemical treatment.
Particularly suitable for stainless steel and aluminum.
Example: Chromating of aluminum.

2. Phosphating:
Creates a phosphate layer on the metal surface.
Often serves as a primer for paints or oils.
Used for automotive parts and machine housings.

3. Corrosion inhibitors:
Chemicals that are dissolved in liquids (water, oils, fuels) to prevent corrosion.
Typical applications: Cooling circuits, boiler water, lubricants.
Example: Nitrite or molybdate inhibitors in coolants.

Electrochemical protection - cathodic corrosion protection (CCP):

Here, the electrochemical reaction of corrosion is prevented by targeted control.

1. Sacrificial anodes (galvanic protection):
Base metals (e.g. zinc, magnesium) are attached to the metal to be protected.
These "sacrifice" themselves and prevent the main metal from corroding.
Used for ship hulls, pipelines and offshore installations.

2. Impressed current cathodic protection (ICCP):
External current source reduces the corrosion reaction.
Used for large pipelines and reinforced concrete structures.

Use of corrosion protection inhibitors:

1. Industry and mechanical engineering:
Corrosion protection oils and greases for moving parts.
Phosphating and paints for machine housings.
Galvanic coatings for precision components.

2. Automotive industry:
Galvanizing & KTL coating (cathodic dip coating) for car bodies.
Cavity sealing with waxes & oils.
Coolant additives with inhibitors against rust formation in the engine.

3. Construction and infrastructure:
Concrete corrosion protection (coatings, impregnations, KKS) for bridges and tunnels.
Galvanized steel beams and protective coatings for load-bearing structures of buildings.
Protective coatings on steel structures (e.g. offshore wind farms).

4. Shipping and offshore industry:
Sacrificial anodes and ICCP systems for the protection of ship hulls.
Special coatings against salt water corrosion.
Antifouling coatings to prevent algae growth.

5. Household and everyday products:
Stainless steel passivation for kitchen appliances.
Corrosion protection sprays for tools and bicycles.
Protective coatings for furniture fittings and outdoor furniture.

Sustainability and environmental aspects in the use of corrosion protection inhibitors:

• Development and use of solvent-free and water-based corrosion inhibitors.
• Biodegradable inhibitors for cooling circuits.
• Reduction of heavy metals in coatings.

Corrosion inhibitors are essential for extending the service life of metal parts and preventing economic damage caused by rust or material degradation. Choosing the right corrosion inhibitor depends on the application, environmental conditions and technical requirements.

Here is an overview of what to look for when purchasing corrosion inhibitors:

Purchasing corrosion inhibitors requires a detailed analysis of application areas, protection requirements, environmental aspects and costs. The wrong choice can lead to increased wear, product failure and high maintenance costs.

• Determine the area of application of the corrosion protection agent, e.g. mechanical engineering, automotive, construction, infrastructure or shipping and offshore industry. Different applications require specific corrosion protection agents.
• When purchasing, it should be clear what type of corrosion protection is required:
• Physical protection through coatings with waxes or oils as a protective barrier against moisture and chemicals.
• Chemical protection such as passivation or through the use of inhibitors. For example, modifying the metal surface to make it corrosion-resistant.
• Electrochemical protection through the use of sacrificial anodes or impressed current anodes to control the electrochemical reactions.
• What type of metal needs to be protected? Steel, aluminum, copper or stainless steel? Each of these metals requires different protective agents.
• What are the environmental conditions? In particular, temperature, humidity and exposure to chemicals influence corrosion.
• How long is the protection intended for? Temporary protection (e.g. for transportation) or long-term protection (e.g. for infrastructure buildings)?
• For which areas of application and industries is the corrosion protection intended?
• Automotive industry: Bodywork and cavity sealing, cathodic dip coating.
• Mechanical engineering: corrosion protection oils for storage and transportation, or special paints for metal parts.
• Construction industry: Galvanizing and coatings for steel beams and concrete.
• Shipping and offshore: Cathodic protection for ships and platforms.
• Electronics: conformal coatings against moisture.
• Corrosion inhibitors must comply with various standards:
• ISO 12944 - Corrosion protection for steel structures.
• ASTM B117 - Salt spray test for the evaluation of corrosion resistance.
• DIN 30677 - Requirements for corrosion protection oils.
• REACH & RoHS - Chemical and environmental regulations.
• NACE standards - protection in the oil and gas industry.
• A good supplier should provide test certificates and test reports.
• Choose corrosion inhibitors from manufacturers that are certified to international standards (e.g. ISO 9001, ISO 14001) to ensure consistent high quality.
• Does the supplier offer comprehensive technical support and advice? Are there laboratory tests or application aids?
• What is the production capacity and delivery reliability like? Is just-in-time delivery possible?
• Total Cost of Ownership (TCO) - In addition to the purchase price, consider durability, performance and storage costs.
• Pay attention to the dangerous goods classification. Many corrosion inhibitors are flammable or hazardous to the environment (ADR, IMDG)
• Which packaging units can be supplied? Canisters, drums, IBC containers or individual spray cans?
• What storage conditions are required? Is temperature and humidity control necessary?
• Does the product have a limited shelf life? Certain chemicals should be stored separately.
• Prefer water-based corrosion inhibitors as an alternative to solvent-based products.
• Biodegradable additives to reduce environmental impact.
• Avoid heavy metals and toxic substances, e.g. chromium (VI)-free passivations.
• Sustainable corrosion protection agents can not only be more environmentally friendly in the long term, but also more economical.
• Consider the total cost of the corrosion inhibitor, including purchase price, consumption rate and maintenance costs, and choose the product with the best price-performance ratio.

Purchasing corrosion inhibitors is a strategic decision that includes technical, economic and regulatory aspects. Careful product selection and supplier evaluation can not only extend the life of the protected materials, but also reduce costs in the long term.

Corrosion inhibitors can be purchased from various suppliers. Comprehensive information about manufacturers and suppliers of Corrosion inhibitors from all over the world can be found on Exportpages.