| MAO Li-na,YIN Chao-fan,CHEN Qi-ming.Corrosion Inhibition of HPAA for Q235 Steel in Alkaline Solution[J],44(11):79-86 |
| Corrosion Inhibition of HPAA for Q235 Steel in Alkaline Solution |
| Received:July 07, 2015 Revised:November 20, 2015 |
| View Full Text View/Add Comment Download reader |
| DOI：10.16490/j.cnki.issn.1001-3660.2015.11.013 |
| KeyWord:HPAA corrosion inhibitor compound corrosion inhibitor corrosion rate inhibition rate response surface method |
| Author | Institution |
| MAO Li-na |
School of Chemistry and Environmental Engineering, Wuhan Institute of Technology, Wuhan , China |
| YIN Chao-fan |
Hubei New Reactor and Green Chemical Technology Laboratory, Wuhan , China |
| CHEN Qi-ming |
Hubei New Reactor and Green Chemical Technology Laboratory, Wuhan , China |
|
| Hits: |
| Download times: |
| Abstract: |
| Objective To research the corrosion inhibition of 2-hydroxy-phosphate (HPAA) on Q235 steel by using response surface analysis. Methods By the method of single factor sensitivity analysis, the quality concentration of HPAA, temperature, pH value and other factors were investigated, and the optimal range of the three key factors was determined. Based on response surface optimization analysis (RSM), according to the results of single factor experiments, the optimal experimental design of mass concentration, temperature and pH value was carried out by using central composite design principle ( CCD). The response value of the HPAA was used for equation regression with RSM. Then the corresponding model of the quadratic associative model was obtained. After optimizing, the optimized parameters of the model were applied to SEM and EIS analysis of compound corrosion inhibitors. Results The single factor analysis determined the optimal values of the three key variables of mass concentration, temperature and pH value respectively were 20 ~ 26 mg / L, 45 ~ 55 ℃ and 8 ~ 10. The optimal concentration of HPAA was 23 mg / L, the temperature was 50 ℃ , and the pH value was 9, the inhibition rate of HPAA was 68. 68% . Under the conditions, the inhibition rate of the experimental results was 68. 78% with the deviation being only 0. 15% compared to the predicted value. The optimized parameters were used in the compound corrosion inhibitor. It was found that when the concentration ratio of HPAA : Na2 MOO4 : Na2 B4 O7 was 0. 5:0. 3:0. 5, the compound corrosion inhibitor dosage was the least with the maximum inhibition rate up to 93. 75% . The compound corrosion inhibitor showed no corrosion in the SEM diagram. The EIS spectrum showed a pure capacitance, and the impedance was the biggest with the highest inhibition rate. Conclusion The response surface method combined SEM and EIS applied in inhibiting corrosion of HPAA is feasible, accurate and reliable. |
| Close |
|
|
|