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Ozone corrosion in Industrial Ozone Systems

Ozone corrosion: common mistakes to avoid in industrial ozone systems

Ozone is one of the most powerful oxidizing agents used in modern industry. Its effectiveness for water treatment, disinfection, odor control, biofilm removal, micropollutant oxidation, and food processing has made it a preferred solution across a wide range of sectors.

However, the same oxidizing properties that make ozone highly effective can also create challenges when systems are poorly designed. Material incompatibilities, incorrect component selection, and inadequate engineering can lead to premature equipment degradation, leaks, downtime, and increased maintenance costs.

The good news is that ozone itself is not inherently destructive. Most corrosion-related failures result from avoidable design mistakes rather than from ozone technology itself.

Why can ozone cause corrosion?

With an oxidation potential of 2.07 volts, ozone is stronger than chlorine and many other commonly used oxidants.

When exposed to incompatible materials, ozone can cause:

  • Metal oxidation
  • Elastomer degradation
  • Stress cracking
  • Seal failures
  • Plastic embrittlement
  • Premature aging of components

The severity of these effects depends on several factors:

  • Ozone concentration
  • Temperature
  • Humidity
  • Exposure duration
  • Mechanical stress
  • Material composition

A properly engineered ozone installation can operate reliably for decades with minimal corrosion issues.

Mistake #1: Using non-compatible materials

The most common cause of ozone-related failures is the use of materials that were never designed to withstand ozone exposure.

Many components suitable for compressed air or water applications perform poorly in ozone environments.

  • Carbon steel
  • Aluminum
  • Standard brass
  • Nitrile rubber (NBR)
  • Natural rubber
  • Certain adhesives and sealants

These materials may crack, oxidize, lose elasticity, or fail unexpectedly when exposed to ozone.

Mistake #2: ignoring seal and gasket compatibility

Even when piping and equipment are properly selected, incompatible seals often become the first point of failure.

A single unsuitable gasket can compromise an entire installation.

  • PTFE
  • FEP
  • PFA
  • Ozone-rated FKM compounds

Materials to avoid

  • NBR
  • Natural rubber
  • Non-certified EPDM compounds

The cost difference between a standard gasket and an ozone-resistant gasket is usually insignificant compared to the cost of an unexpected shutdown.

Mistake #3: selecting the wrong stainless steel grade

Not all stainless steels provide the same level of resistance in ozone applications.

304 Stainless Steel

Grade 304 stainless steel may perform adequately in some low-demand applications, but its resistance can decrease when:

  • Ozone concentrations increase
  • Chlorides are present
  • Operating temperatures rise
  • Continuous operation is required

316L Stainless Steel

For most industrial ozone systems, 316L stainless steel is the preferred choice.

Benefits include:

  • Superior corrosion resistance
  • Improved chloride resistance
  • Longer service life
  • Excellent performance in ozonated water systems

Mistake #4: overlooking localized ozone concentrations

Many failures occur because designers focus on average ozone concentrations while ignoring localized ozone hotspots.

Critical areas often include:

  • Generator outlets
  • Injection systems
  • Mixing chambers
  • Dead zones within piping networks

These locations may experience ozone concentrations significantly higher than the system average.

Mistake #5: neglecting off-gas destruction

Not all injected ozone is consumed during treatment.

Without an ozone destruction unit, residual ozone can:

  • Damage nearby equipment
  • Accelerate component aging
  • Corrode electrical systems
  • Create health and safety risks

Thermal or thermocatalytic ozone destructors are essential components in most industrial ozone installations.

Mistake #6: using standard flexible hoses

Flexible hoses are frequently among the first components to fail in ozone systems.

Recommended hose materials include:

  • PTFE
  • PFA
  • FEP
  • 316L stainless steel

These materials provide excellent long-term resistance even under high ozone concentrations.

Mistake #7: treating gaseous and dissolved ozone as identical

Material compatibility differs significantly between gaseous ozone and dissolved ozone.

Gaseous ozone is typically much more aggressive than ozone dissolved in water.

Components located between the ozone generator and the injection point should therefore receive particular attention during the design phase.

Mistake #8: focusing only on initial investment costs

Choosing the lowest-cost components can dramatically increase lifecycle costs.

Poor material selection often results in:

  • Frequent replacements
  • Production downtime
  • Increased maintenance costs
  • Reduced process reliability

Evaluating total cost of ownership rather than initial purchase price almost always leads to better long-term results.

Best materials for industrial ozone applications

Excellent resistance

  • PTFE
  • PFA
  • FEP
  • PVDF
  • 316L Stainless Steel
  • Glass
  • Ceramic

Good resistance

  • PVC-U
  • CPVC
  • HDPE
  • Polypropylene (PP)

Application-dependent

  • 304 Stainless Steel
  • EPDM
  • Standard FKM
  • Carbon Steel
  • Aluminum
  • Brass
  • NBR
  • Natural Rubber

Engineering matters more than the ozone generator

One of the most common misconceptions is that corrosion problems originate from the ozone generator itself.

In reality, most failures are caused by peripheral components such as seals, hoses, valves, injectors, contact chambers, or poorly designed gas handling systems.

The long-term success of an ozone project depends far more on engineering quality, material compatibility, mass transfer efficiency, and safety design than on the generator alone.

At OXYTRADING UK, we regularly encounter installations where the generator performs perfectly, but poor material selection elsewhere in the process creates costly reliability issues.

Conclusion

Ozone remains one of the most effective and environmentally friendly oxidation technologies available to industry. When systems are properly engineered using ozone-compatible materials and proven design principles, corrosion issues can be virtually eliminated.

Successful ozone projects require careful attention to material selection, piping design, gas management, ozone destruction, and process integration.

A properly designed ozone installation can provide decades of reliable operation while delivering outstanding treatment performance and low operating costs.

At OXYTRADING UK, we design industrial ozone systems with a strong focus on reliability, safety, material compatibility, and long-term performance, ensuring our clients achieve the full benefits of ozone technology while minimizing maintenance and operating costs.