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A corrosion inhibitor or anti-corrosive is a chemical compound added to a liquid or gas to decrease the corrosion rate of a metal that comes into contact with the fluid. [1] The effectiveness of a corrosion inhibitor depends on fluid composition and dynamics .
Less flow resistance, lower dissolved feedwater iron concentrations, FeOOH film is more stable, reduced boiler cleaning frequency - Disadvantages: Increased risk of FAC, a deaerator is required, more frequent chemical cleaning is required, hazardous chemicals (hydrazine) are used. A deaerator is required. Air leakage is more serious.
NACE International Standard TM0208 defines volatile corrosion inhibitor (VCI) as a chemical substance that acts to reduce corrosion by a combination of volatilization from a VCI material, vapor transport in the atmosphere of an enclosed environment, and condensation onto surface in the space, including absorption, dissolution, and hydrophobic ...
Other organic products used as corrosion inhibitors in the oil industry are nitriles, amides, oximes, ureas and, thioureas, and phosphonate salts. Inorganic inhibitors such as lanthanides, [ 12 ] molybdates, silicates, boric and phosphoric acids, and combinations of nitrates and nitrites are also widely employed.
Oxygen absorbing chemicals are also commonly added to boiler feedwater used in boiler systems, to reduce corrosion of components within the system. [6]
Fineamin treatment is used against corrosion and fouling in steam boilers, warm and hot water piping systems, superheaters, as well as cooling circuits. Fineamin is an environmentally friendly technology and does not significantly decompose even at high temperature and pressure required by the modern power-plant boilers. [ 3 ]
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