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Corrosion inhibitors are designed to prevent metal loss that would otherwise lead to critical system failures in heat exchangers, recirculating water piping, and process cooling equipment. Furthermore, corrosion results in a loss of efficiency as corrosion products precipitate on critical heat transfer devices and insulate the metals.
Corrosion is caused by metals attempting to return to their natural state. Corrosion can be present in many forms, including uniform metal loss, localized or pitting, bi-metallic, galvanic, under deposit, and microbiological induced corrosion (MIC). The process starts when surface irregularities, stresses, or compositional differences result in the formation of a corrosion cell (anode and cathode). Once started, corrosion at the anode causes metal to be released into the system or redeposited locally. Pitting is particularly problematic because the local loss of metal can result in thru-wall perforation of piping and tubing.
ChemTreat has a comprehensive portfolio of organic, inorganic, and non-phosphate corrosion inhibitors engineered to passivate metals by reducing the corrosion potential associated with the anode and cathode of the corrosion cell. Chemicals that form protective films at the anode include chromate, orthophosphate, nitrite, silicate, and molybdate. Chemicals that form films on the cathode include calcium carbonate, polyphosphate, zinc, phosphonate, and azoles. We offer a selection of both anodic and cathodic inhibitors.
Discover More | ChemTreat’s cooling water corrosion inhibitor treatments fall into several classes:
A feature of all-organic treatment programs is their frequent use in systems without pH control. They rely on systems with a tendency to form scale as opposed to corrosion. As a result, attention to mineral scale control is critical. At the lower end of the pH and LSI ranges, the various combinations of phosphonates, polymers, and dispersants in a one drum combination product are normally satisfactory for system corrosion and scale inhibition. Supplemental ChemTreat dispersant polymers or blends will be required as the hardness, alkalinity, pH, cycles, and severity of heat load are increased.
All-organic programs are not normally used in aggressive waters. These conditions may cause increased mild steel corrosion, requiring supplemental dispersants or sequestrants and providing no substantial improvement in corrosion control. In these systems, we recommend using one of the zinc/HEDP or stabilized inorganic phosphate programs; however, an all-organic program can sometimes be used in these systems if the water can be cycled up enough to make the tower water noncorrosive (LSI of +1 or greater).