Chemical Aggression and Abrasion

PRO-DO-MIX® vertical agitators are typically made of AISI304, AISI304L, AISI316, or AISI316L stainless steel. However, when certain parts of the agitator – such as the shaft and impeller – come into contact with aggressive chemicals or abrasive liquids, it may be necessary to use specific materials and coatings to preserve their durability and functionality. The choice of material and coating depends on various factors, primarily the fluid’s characteristics but also the operating conditions of the plant.

Anti-Corrosion Coatings in Plastic Materials

Corrosion can occur in the presence of aggressive chemicals, a common occurrence in the chemical and plastics industries and can manifest in various ways, times, and intensities depending on the substance and temperature. The corrosion allowance, which is the increase in component thickness to compensate for that “consumed” due to corrosive phenomena (calculated in mm/year) is an important parameter for selecting materials and/or coatings.

Among the possible solutions provided by PRO-DO-MIX®, there are the following plastic coatings:

Duplex and Super-Duplex Against Chemical Aggression

Another solution is to use exotic materials to build components in contact with the liquid. Alloys such as Duplex (with a PREN range between 28–38, EN 1.4462 / DUPLEX UNS S31803 / F51 / UNS S32205 / F60) and Super-Duplex (with a PREN range between 38–45, EN 1.4410 / SUPER DUPLEX UNS S32750 / F53 / 2507) boast high corrosion resistance and withstand extreme environments, such as high temperatures. In addition to exceptional chemical performance, they also offer excellent mechanical properties.

By selecting the appropriate materials and coatings, PRO-DO-MIX® can eliminate the risk of corrosion and ensure long-term reliability. With over 20 years of experience, we have developed a free tool for evaluating the compatibility between construction materials, coating options, and the chemical substance in the liquid to be agitated.

EBONITE and Anti-Abrasion Coatings for Slurries or Liquids

Abrasion is the phenomenon that occurs when the agitator is immersed in slurry or liquids with high amounts of processing residues, such as powders and flakes of iron, steel, sand, and other metals. Solid particles in the liquid generate friction, leading to abrasion and damage to the shaft and/or impeller. The solution in this case is to coat the parts in contact with specific anti-abrasion materials to extend the life and maintain the agitator’s performance over time, eliminating the risk of contamination from unwanted residues. EBONITE is considered the best coating for these applications, thanks to its extraordinary resistance to abrasive phenomena.

Abrasion is a constant risk in industrial wastewater treatment or the mining, ceramic, and cement sectors. You can delve into a particular case of EBONITE usage in a wastewater treatment plant at a steel mill by reading our success story.

Quality and Safety First: The PRO-DO-MIX® Approach

Choosing the best coating is not enough; it must also be applied and handled with expertise. For this reason, PRO-DO-MIX® subjects all coatings to a dielectric test, ensuring their continuity and preventing possible future damage that could compromise the agitator’s operation. At PRO-DO-MIX®, we also pay great attention to the safety of our customers’ work environments: all our coatings are available upon request for ATEX environments, thanks to specific materials with antistatic properties.

Looking for a solution to protect your agitators from abrasion and corrosion? Contact us to find the product that best suits your needs