Approved by the FDA of a condensing boiler system

e707004304

Approved by the FDA of a condensing boiler system with a green corrosion inhibitor

) And 1500rpm (curves 3 and 4) under the CO, saturation in deionized water, the temperature 180oF (82 ℃) pH4.1 when the polarization curves of carbon steel. To test containing C () 2, the corrosion is very strong in the condensing system, high velocity conditions, the performance of GCI. By the polarization curves can be seen in two different speeds, I use 300ppmGCI to get a very good percentage inhibition effect. The presence of corrosion inhibitor in the same time inhibit the corrosion of the cathode and the anode,[link widoczny dla zalogowanych], cathode and anode corrosion inhibition effect is better than good. Linear polarization measurements show that, 500rpm on the corrosion rate from a blank sample (no treatment) was reduced to 300ppmGCI 80.8mpy when 6.2mpy, which reduces the corrosion rate of 92%. 1500rpm, the corrosion rate from the blank (no treatment) was reduced to 300ppmGCI 85.7mpy when 14.7mpy, the corrosion rate decreased 83%. Laboratory Fushi Simulator (CorrSim) is shown in Figure 5, corrosion monitoring device (CM) and electrochemical impedance spectroscopy (EIS) measured at 175. F (79 ℃) and No. 6 of 2002 the water at the typical EIS data. Impedance spectra can be seen as a distortion of the semicircle, only once relaxation. Obtained in Phase 2 EIS 300ppmGCI processed data (Figure 7) shows two semi-circular deformation (two relaxation), a high frequency, and the other in the low frequency region, indicating the existence of the metal surface protective film. It can be seen from Figure 5 Corrosion monitors and corrosion rate measured EIS has a good consistency. E: o, -, ∞ Mann 514 {l3 {Co ~ Sim, pH6.5, EISDay group 5Phase1. NoTreatm ~ tl = 5.95KohmsX0.63cm2 = 3.75KohmsCm2678910l1l2l3Real (Kohms) Figure 6 without making treatment condition (phase 1) of the EIS data obtained experiment also compared the treated and not done processing the visual nature of the specimen surface. Without making the tube surface treatment can be soaked in water, and after treatment,[link widoczny dla zalogowanych], the water gathered into drops of water on the metal surface. Indicate the presence of a protective film exclusion drops. Figure 8 is measured by the corrosion monitor the 200oF (93 ℃) under different treatment conditions when you get more CorrSire carbon steel corrosion rate data. Case,[link widoczny dla zalogowanych], through the simulated environment by adding condensing CO2 method of deionized water saturated experimental water pH adjusted to 6.4 or so, remove the water samples Fe (Ⅱ) and total iron concentration (Fig. 9) and used with corrosion rate data to do comparison. In the course of the experiment is not recorded in the pH and dissolved oxygen concentrations have changed significantly. ●, ● ● a ● - ● A A. . A m a l a 7 ● one. A 21O2002 No. 6 Water Information Report 33 Figure l0-site measured Fe (Ⅱ) concentration TreatmentCon ~ fions Figure ll-site monitoring device with a corrosion test (\\The results shown in Figure l0 (iron concentration) and 11 (corrosion rate). Amine treatment in Fe (Ⅱ) concentration of about 10ppb (stage 1). Amine treatment of them and stop (stage 2), Fe (Ⅱ) concentration rose to 200ppb. When Phase 3 after joining 45ppmGCI. Iron concentration decreased from 200ppb 40ppb (80% reduction). GCI's dosage will be reduced to llppm time (stage 4),[link widoczny dla zalogowanych], Fe (Ⅱ) concentration slightly improved. Figure 11 shows the use of corrosion monitoring devices and other electrochemical techniques such as EIS (in Figure ll in the E mark) and the potential of dynamic polarization (P in Figure 11 to mark) Comparison of measured performance. Without amine treatment, the corrosion rate from 1.0 ~ 2.0mpy (Phase 1) rose to 3.0 ~ 3.5mpy (Phase 2). GCI added,[link widoczny dla zalogowanych], the corrosion rate to less than 0.5mpy (stage 3 and stage 4), the corrosion rate decreased 85%. When processing is stopped. Corrosion rate did not change significantly. This may be due to the corrosion of the study was carried out under low temperature. The results show that. Corrosion inhibitor to form a protective film is persistent, especially at low temperatures. Conclusion of a non-toxic, \A (a E-oco ou a ∞ o Wong