Industrial process equipment, such as pumps, mixers, and piping, is subject to constant mechanical and chemical wear. Solids carried by flowing liquids, as well as bubble collapse caused by pressure fluctuations, quickly damage unprotected steel. As metal surfaces wear down, equipment efficiency declines, energy consumption increases, and this often results in the costly replacement of equipment or parts.

Traditional paints or thin protective coatings do not hold up well against such extreme forces. That is why it is important in industrial facilities and engineering to understand how advanced surface treatment materials work on a physical level. Ceramically reinforced composite materials offer a technical solution that protects equipment under challenging flow conditions.

What does Advanced Reinforced Coatings (ARC) mean, and what is it made of?

Advanced Reinforced Coatings, or, for short, ARC composites are highly advanced two-component protective coatings. Their performance is based on a composite structure that combines a tough polymer matrix with hard reinforcing particles. When applied as a liquid or paste, the material forms a dense protective layer as it cures, which adheres firmly to metal or concrete surfaces.

The polymer matrix acts as a binder that transfers external impacts and mechanical loads to the ceramic or silicon carbide-based reinforcing particles within the material. This microstructure prevents scratches and cracks from propagating through the material. Thanks to its strong structure, localized abrasion or impacts do not damage the underlying steel, and the protective film does not flake off.

In Finland, these high-quality ARC products are used in demanding industrial applications. These are liquid or paste-like specialty materials that are used when conditions require greater durability than conventional floor coatings, polyurea, or plain steel can provide. For more details on the various applications and materials of this technology, please visit the page featuring ARC composite coatings.

How does ARC composite coating differ from traditional epoxy or polyurethane coatings?

Industrial maintenance involves the use of a variety of protective materials, the performance of which varies greatly depending on the type of stress. For example, polyurea is ideal for applications requiring flexible waterproofing and weather protection, such as roofs and pools. Standard epoxy coatings, on the other hand, work best in dry indoor environments and on floors subject to moderate mechanical loads.

When working with closed processes —such as sulfuric acid tanks, hot process tanks, or piping carrying concentrated alkalis or abrasive sugars—elastic or thin protective linings can fail quickly. Chemicals penetrate porous materials and cause corrosion of the substrate. Alternatively, abrasive solids can wear through a soft coating in a short time.

In these situations the exceptional hardness and density really shine. The ceramic-reinforced structure provides impenetrable chemical protection and withstands severe mechanical wear. The material does not swell when exposed to chemicals and is not easily scratched, making it a practical choice when other materials reach the limits of their performance.

How does ARC coating protect industrial pumps and mixers from cavitation and erosion?

Rotating steel structures exposed to flow stress, such as pump impellers and mixer blades, are subject to two abrasive physical phenomena: cavitation and erosion. In cavitation, the fluid pressure drops locally so rapidly that vapor bubbles form. When the pressure rises again, these bubbles collapse in a fraction of a second. This phenomenon generates powerful shock waves that strike the metal surface directly and gradually erode it.

Erosion, on the other hand, refers to the continuous mechanical abrasion caused by solid particles, such as sand or silt, carried along by a flowing liquid. Protective coatings prevent this type of damage in two main ways:

• ✔ Improved flow dynamics: A smooth surface reduces fluid turbulence. When turbulence is reduced, there are fewer pressure fluctuations that cause cavitation. This also saves energy, as the fluid flows through the pump chamber with less resistance.
• ✔ Impact energy absorption: The ceramic reinforcement absorbs the impact energy generated by the collapse of bubbles and prevents microscopic cracks from forming on the steel surface being protected.

The service life of industrial mixers and pumps can thus be increased many times over compared to bare steel. Maintenance intervals can be extended, and the equipment remains in production use without sudden mechanical damage.

When ensuring the long-term functionality of critical process equipment under demanding conditions, the right choice of installation method and coating is crucial. At Kotek Factory Service Oy, we carry out demanding industrial coating and maintenance work with a high level of expertise. You can learn more about our services on the Tank Coatings and Pump Maintenance pages.

How does the coating material withstand extreme temperature fluctuations and prevent the concrete from cracking?

Temperatures in industrial process tanks and vessels can fluctuate rapidly. For example, draining hot process fluid followed by a cold wash causes a severe thermal shock to the structures. Metal and concrete have their own expansion characteristics. If a protective coating cannot adapt to these rapid changes, it will crack or peel away from the substrate.

The coefficient of thermal expansion of ceramic-reinforced composites used in modern protective solutions is close to that of steel and concrete. Mechanical compatibility ensures that the coating flexes with the substrate without generating internal stresses. Since the coating does not delaminate or crack due to temperature fluctuations, the underlying structure remains protected year after year.

The protected structure withstands mechanical impacts, high temperatures, and thermal shocks without sustaining damage. The dense ARC coating seals the pores in the concrete and prevents chemicals and moisture from penetrating hairline cracks. Since aggressive substances cannot penetrate the structure, chemical deterioration of the concrete and corrosion of the steel are prevented. This saves the building and its equipment from premature renovation.

Predictive maintenance minimizes production downtime and extends the service life of equipment

Industrial production shutdowns pose significant financial risks. When critical process equipment, such as a main pump or mixer, is damaged due to mechanical wear, the indirect production losses quickly exceed the cost of the replacement part itself. Constantly repairing equipment or ordering new parts is therefore not the most economically sound approach.

A suitable and professionally applied protective coating serves as the foundation for preventive maintenance. Technical preliminary planning and the selection of the coating are always based on precise technical requirements. When surface treatment is carried out in a controlled and planned manner, the equipment’s service life is extended, and maintenance can be scheduled to coincide with planned production downtime.

In a reliable partnership, agreed-upon schedules are met and warranty issues are handled responsibly. Technically sound solutions protect industrial equipment investments for decades without any unnecessary sales pitches.

What are the main applications for high-performance products in the industrial sector?

Ceramically reinforced composite coatings have been developed for applications where traditional surface treatment methods or special steels are insufficient. There are numerous points in industrial processes where the combination of mechanical wear and chemical stress requires exceptional durability.

The most important applications include, for example:

• ✔ Sulfuric acid tanks and process tanks: Strong acids and bases quickly corrode unprotected metal or conventional epoxy coatings. A composite coating creates a chemically inert protective layer that withstands long-term exposure to concentrated acids.
• ✔ Industrial mixers and liners: Mixing chemicals and solids subjects the liners to constant mechanical abrasion and erosion. The ceramic reinforcement in the composite significantly extends the service life of the mixers.
• ✔ Pump housings and impellers: The high flow velocities in the impellers create conditions conducive to cavitation. A smooth coating reduces pressure losses and thus prevents cavitation damage.
• ✔ Lines that handle concentrated sugars: In the food and processing industries, hot, concentrated sugar solutions can be abrasive and corrosive. A ceramic coating withstands the stress caused by these solutions exceptionally well.

Protecting critical industrial equipment from cavitation and erosion requires surface treatment performance that traditional materials cannot match. The ceramic-reinforced ARC coating provides high-performance protection that extends equipment service life, improves flow dynamics, and prevents unexpected production downtime. Surface treatment performed carefully and using the correct methods makes industrial plant maintenance predictable and cost-effective.