How Non-Stick Properties Enhance Corrosion Resistance

Introduction

A coating’s ability to resist corrosion is traditionally associated with its barrier properties, chemical stability, adhesion, and resistance to environmental degradation. However, the incorporation of non-stick (low surface energy) characteristics can significantly enhance corrosion protection by reducing the interaction between the coated surface and corrosive agents. While non-stick performance is often discussed in relation to cleanability and fouling resistance, it also plays an important role in extending coating life and improving long-term corrosion resistance.

Corrosion occurs when a metal substrate reacts with its surrounding environment, often in the presence of moisture, oxygen, salts, acids, or other aggressive chemicals. Protective coatings serve as a barrier between the substrate and these corrosive elements. The effectiveness of this barrier depends not only on its physical integrity but also on how readily contaminants can adhere to and remain on the surface.

Non-stick coatings, characterized by low surface energy and reduced adhesion to foreign materials, provide an additional mechanism of protection that complements traditional corrosion-resistant technologies.

1. Reduced Retention of Water and Corrosive Electrolytes

Water is one of the primary drivers of corrosion. Many corrosion processes require an electrolyte layer to facilitate electrochemical reactions at the metal surface.

Non-stick coatings reduce the wettability of the surface, causing water to bead up rather than spread into a continuous film.

This effect offers several benefits:

• Minimizes contact time between water and the coating.
• Reduces the likelihood of moisture permeating coating defects.
• Limits the formation of conductive electrolyte layers.
• Accelerates drying after exposure to rain, washing, or condensation.

By reducing the residence time of moisture on the surface, non-stick coatings decrease the opportunity for corrosion cells to develop.

2. Mitigation of Contaminant Accumulation

Corrosive contaminants such as road salts, marine salts (sea water/moisture), industrial pollutants, acidic residues, chemical process deposits can accumulate on coated surfaces and create localized corrosion sites.

While non-stick and hydrophobic surfaces don’t cause these variables to simply fall off surfaces on their own, because they don’t develop a foothold to the surfaces, when cleaned or natural rinsing (rain), these corrosive contaminants can be mitigated before they affect the coating.

This self-cleaning effect helps maintain the protective performance of the coating throughout its service life.

3. Mitigation of Crevice and Under-Deposit Corrosion

Deposits that remain attached to a surface can trap moisture and contaminants, creating localized environments that promote aggressive corrosion mechanisms.

Examples include salt deposits, mineral scale, biological growth, and manufacturing process residues. Each of these sources of corrosion can establish differential oxygen concentrations, leading to under-deposit or crevice corrosion. Non-stick coatings discourage deposit formation and facilitate contaminant release, they reduce the likelihood of these localized corrosion mechanisms developing.

NOTE: Always evaluate the chemistry of non-stick coating being chosen to ensure its own chemistry is capable of withstanding the corrosive mechanism(s) otherwise, non-stick properties alone may not be a good enough solution.

4. Reduced Biofouling and Microbiologically Influenced Corrosion

In marine, wastewater, and industrial environments, biological organisms can attach to surfaces and form biofilms. These biofilms often retain moisture and create microenvironments that accelerate corrosion.

Non-stick surfaces inhibit the initial attachment of bacteria, algae, fungi and marine organisms. As noted in the “Under-Deposit Corrosion” in point number 3 above, non-stick properties alone, are not enough. However, non-stick properties can definitely minimize biofilm formation, and Microbiologically Influenced Corrosion (MIC). This field is perhaps the most challenging type of corrosive contaminant.

5. Improved Chemical Resistance Through Surface Inertness

Without exception, fluoropolymer-based coatings offer the best chemical corrosion resistance within the world of “thin-film” coatings. Fluoropolymer coatings provide highly inert chemical structures, meaning these types of coatings do not adsorb or react with corrosive contaminants thus not allowing them to begin. Highly inert coatings such as fluoropolymers are often described as having strong chemical bonds, low (chemical) reactivity, excellent resistance to acids and alkalis, and highly resistance to solvent attacks.

The same molecular characteristics that provide non-stick behavior frequently contribute to superior chemical durability. This durability helps preserve the coating’s barrier properties even in harsh service environments.

6. Easier Cleanability means Less Deterioration to the Coating Due to more aggressive “tools” during maintenance.

Corrosion resistance depends heavily on maintaining an intact coating film. When contaminants strongly adhere to a surface, aggressive cleaning methods may be required to remove them. Mechanical cleaning can introduce scratches, abrasion, or coating damage that compromise corrosion protection.

Non-stick surfaces allow contaminants to be removed with less force, resulting in:

• Reduced coating wear
• Lower maintenance requirements
• Longer coating service life
• Improved retention of barrier performance

This indirect benefit can significantly improve long-term corrosion protection in demanding applications.

7. Synergy with Traditional Corrosion Protection Mechanisms

Non-stick properties should not be viewed as a replacement for conventional corrosion protection technologies. Instead, they function as an enhancement that works alongside established mechanisms such as:

• Barrier protection
• Corrosion-inhibiting pigments
• Sacrificial protection
• Chemical passivation
• Advanced resin systems

When combined with these technologies, non-stick characteristics provide an additional defense layer by minimizing the exposure of the coating system to moisture, contaminants, and fouling.

Applications Benefiting from Non-Stick Corrosion Protection

Industries that can particularly benefit from the combination of non-stick and corrosion-resistant performance include:

• Marine and offshore structures
• Transportation equipment
• Chemical processing facilities
• Food processing equipment
• Water and wastewater infrastructure
• Architectural and building materials
• Energy and power generation assets

In these environments, reducing contaminant adhesion often translates directly into improved corrosion resistance and lower maintenance costs.

Conclusion

There is no such thing as a “one size fits all” solution in coatings. Always start with the environmental and process-related corrosion variables so they are factored into the best solutions.

If you would like assistance on how to mitigate your corrosive challenges, please email us at info@ecs-ww.com or call us at 816.381.9900.