Composite passivant used for the boiler chemical cleaning of power plant and passivation method
A technology of chemical cleaning and boiler cleaning, which is applied in the direction of boiler cleaning equipment, metal material coating technology, etc., can solve the problems of easy acid corrosion caused by the ignition of the unit, high application requirements, hidden dangers of safe operation, etc., and achieves excellent passivation effect, The passivation process is simple, the agent is safe and non-toxic
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Embodiment 1
[0029] The present invention is used for the compound passivating agent of power plant boiler chemical cleaning, mainly is made up of the component of following mass percentage:
[0030] 0.010% ethylenediaminetetraacetic acid (EDTA), 0.01% trisodium phosphate, 0.5% hydrogen peroxide, 0.01% sodium nitrite, appropriate amount of chemically pure or analytically pure ammonia water to adjust the pH value of the solution to 9.2-9.6, and the balance is water.
Embodiment 2
[0032] The present invention is used for the compound passivating agent of power plant boiler chemical cleaning, mainly is made up of the component of following mass percentage:
[0033] 0.025% ethylenediaminetetraacetic acid (EDTA), 0.02% trisodium phosphate, 0.2% hydrogen peroxide, appropriate amount of chemically pure or analytical pure ammonia water to adjust the pH value of the solution to 9.2-9.6, and the balance is water.
Embodiment 3
[0035] The present invention is used for the compound passivating agent of power plant boiler chemical cleaning, mainly is made up of the component of following mass percentage:
[0036] Ethylenediaminetetraacetic acid (EDTA) 0.016%, trisodium phosphate 0.015%, hydrogen peroxide 0.35%, sodium nitrite 0.005%, chemically pure or analytically pure ammonia water to adjust the pH value of the solution to 9.2-9.6, and the balance is water.
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