Corrosion inhibitor for one-stage reverse osmosis water produced from sea water desalinization
A corrosion inhibitor and reverse osmosis technology, applied in descaling and water softening, water/sludge/sewage treatment, chemical instruments and methods, etc. problems, to achieve the effect of inhibiting pitting corrosion, alleviating corrosion effect, and simple equipment
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Embodiment 1
[0023] This example relates to a metal corrosion inhibitor in seawater desalination first-stage reverse osmosis product water. The compounded mass ratio of the corrosion inhibitor is 1:3, and the concentration of the compounded corrosion inhibitor is 20 mg / L, that is, sodium gluconate is 5 mg / L. L, sodium silicate is 15mg / L. Using the rotating coupon method, the corrosion rate and corrosion inhibition rate were calculated based on the weight loss of the carbon steel and copper test pieces in the first-stage reverse osmosis product water of seawater desalination after 72 hours of couponing. The results are shown in Table 2.
Embodiment 2
[0025] This example relates to a carbon steel corrosion inhibitor in seawater desalination first-stage reverse osmosis product water. The mass compounding ratio of the corrosion inhibitor is 1:3, and the concentration of the compound corrosion inhibitor is 25mg / L, that is, sodium gluconate is 6.25 mg / L, sodium silicate is 18.75mg / L. Using the rotating coupon method, the corrosion rate and corrosion inhibition rate were calculated based on the weight loss of the carbon steel and copper test pieces in the first-stage reverse osmosis product water of seawater desalination after 72 hours of couponing. The results are shown in Table 2.
Embodiment 3
[0027] This example relates to a carbon steel corrosion inhibitor in seawater desalination first-stage reverse osmosis product water. The compound mass ratio of the corrosion inhibitor is 1:2, and the concentration of the compound corrosion inhibitor is 30 mg / L, that is, sodium gluconate is 10 mg / L, sodium silicate is 20mg / L. Using the rotating coupon method, the corrosion rate and corrosion inhibition rate were calculated based on the weight loss of the carbon steel and copper test pieces in the first-stage reverse osmosis product water of seawater desalination after 72 hours of couponing. The results are shown in Table 2.
[0028] Table 2 Corrosion speed and corrosion inhibition rate of carbon steel in the above three examples
[0029]
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