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Rearch on the Scale and Corrosion Inhibitor of Naphthenic Imidazoline Betaine

Author: ShiZhenShuan
Tutor: ShiShunCun
School: Hunan University of Science and Technology
Course: Chemical Engineering and Technology
Keywords: betaine imidazoline naphthenic acids corrosion inhibition performance scale inhibition performance
CLC: TG174.42
Type: Master's thesis
Year: 2011
Downloads: 51
Quote: 0
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Abstract


The water-soluble naphthenic imidazoline betaine obtained in our laboratory was used as the main pharmacy in this paper. The performance and the inhibition mechanism of this agent were investigated by static weight loss of coupon, Tafel polarization curves and scanning electron microscopy. And according to its molecular structure, the performance of its scale inhibition was evaluated by resistance of calcium carbonate and scanning electron microscopy. The composition formulation of naphthenic imidazoline betaine and other pharmaceutical compound was also discussed.The corrosion inhibition performance was investigated by static coupon weight loss, Tafel polarization curves and scanning electron microscopy in HCl, HCl-H2S aqueous corrosion inhibition system. The results showed that: （1） the inhibition rate reached 90% in 1000 mg / L HCl solution without adjusting pH, 25°C for 20h and 95°C for 4h, the inhibitor dosage was only 50mg / L; the corrosion rate was 68.5% in the pH 6.5-7.0 1000mg / L HCl solution, 80°C, 24h, the dosage was 50mg / L; （2） the corrosion inhibition rate reached 73.7% and 82.2% in the dissolved oxygen solution and deaerated solution in the pH 6.5-7.0 1000 mg/L HCl -500 mg/L H2S corrosive media and the dosage was 20 mg/L; and the corrosion rate was below 0.1 g/（m2·h） in the corrosive media of pH 6.5-7.0 1000 mg/L HCl—100500 mg/L H2S and the dosage was 20 mg/L; （3） the electrochemical experiments showed that the corrosion inhibitor was the anode system based anode and cathode mixed control type inhibitor in the 1000 mg/L HCl corrosion system; （4） scanning electron microscope showed that after the addition of the agents, a uniform and density membrane was observed in the surface of the coupon, which can prevent the erosion of corrosive media effectually.The performance of scale inhibition was also investigated. In the solution of 250mg / L Ca2+, 80°C and the concentration was 1.5, the inhibition rate increased spontaneously with increasing of the dosage of naphthenic imidazoline betaine. The inhibition rate of naphthenic imidazoline betaine reached 63.2% when the dosage was 50mg / L, which was lower than the scale inhibition rate 70.6% of PESA in the same conditions. According to the scanning electron microscopy, the calcium carbonate scale without agents was hexagonal-type, close-packed structure which was beneficial to the cell accumulation and further growth of crystals. But after addition of the agents, the calcium carbonate scale showed a square sheet, loose structure and was easily washed away by water, which indicated that the agents played an important role as antisludging agent.After combining the water-soluble naphthenic imidazoline betaine and department of phosphorus agent, we can found that the pitting phenomenon in high concentration of salt water corrosion system can be eliminated by compounding zinc salts and naphthenic imidazoline betaine, and the addition of PBTCA can also prevent the formation of Zn（OH）2 precipitation. Therefore, the pitting phenomenon can be effectively prevented by addition of the three agents and the corrosion rate increased. The inhibition rate reached 87.6% in sea water corrosion system under the conditions: the central alkyl imidazoline betaine was 100mg / L, PBTCA was 200mg / L, Zn2+ was 20mg / L. The surface of the coupon was smooth and no pitting was observed after the experiment. The optimum composition formulation obtained by the orthogonal method in the circulating cooling water was: 20mg / L PBTCA, 40mg/ L cycloalkyl betaine, 4mg/L Zn2+, 10mg / L AMPS. Under the optimum conditions, the surface of the coupon was bright, the corrotion solution was clear and no precipitation was observed. The composition formulation of scale inhibition experiments were also optimized by orthogonal method. The scale ratio can reached over 83.6% while the naphthenic imidazoline betaine was 10mg / L, PESA was 10mg / L, AMPS was 5mg / L, PBTCA was 5mg / L.

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metallurgy and Heat Treatment > Metal corrosion protection,metal surface treatment > Corrosion control and protection > Metal surface protection technology > Metal preservatives,corrosion inhibitors
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