Scale & Corrosion Inhibitors
Scale and corrosion are the two most common causes of efficiency loss and premature equipment failure in industrial water systems, and they rarely occur in isolation. Scale forms when dissolved minerals such as calcium carbonate, magnesium silicate, and silica exceed their solubility limits and deposit on heat transfer surfaces. Even a thin layer of scale has a significant impact: its thermal conductivity is 20 to 40 times lower than steel, meaning a quarter-inch deposit can reduce heat transfer efficiency by 20 to 30 percent and force equipment to work harder to meet demand.
Corrosion works through different mechanisms but causes compounding damage. Dissolved oxygen drives pitting attacks that penetrate pipe walls and vessel surfaces. Carbonic acid forms when CO2 dissolves in water, lowering pH and attacking steel and copper. Galvanic corrosion accelerates metal loss wherever dissimilar metals share contact through the water. The iron oxide produced by corrosion circulates through the system, depositing on heat transfer surfaces and creating the conditions for under-deposit corrosion, a cycle that feeds itself if left unmanaged.
Scale inhibitors interrupt mineral precipitation through threshold inhibition, crystal modification, and dispersion, while corrosion inhibitors form protective films on metal surfaces through anodic passivation, cathodic inhibition, and/or organic film formation. An effective program uses chemistry matched to your makeup water composition, system metallurgy, operating temperatures, and discharge requirements, and is verified through regular water analysis and corrosion coupon monitoring.
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