›› 2005, Vol. 25 ›› Issue (04): 100-104.
• 研究报告 • Previous Articles
QIU Xue-qing, YI Cong-hua, YANG Dong-jie, LOU Hong-ming
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Abstract: Calcium lignosulphonate (CL) was separated into four fractions of different relative molecular weights (Mw) by ultrafiltration and their contents of functional groups were determined. The corrosion-inhibition performances and mechanism of different fractions were studied by weight-loss and electrochemical impedance spectroscopy. Results indicated that contents of carboxyl, phenolic hydroxyl and sulfonic groups decreased with increased Mw. Only the fractions of Mw<5 000 had corrosion-inhibition performance. The fitting results showed that the equivalent circuit models were different with fractions of different Mw. Two time-constants appeared in the electrode system in the solution with Mw between 1 000 and 5 000, which indicated that this fraction could form an inhibitory film on the surface of carbon steel.
Key words: calcium lignosulphonate, corrosion inhibition, electrochemical impedance spectroscopy
CLC Number:
TQ351.013
QIU Xue-qing;YI Cong-hua;YANG Dong-jie;LOU Hong-ming. STUDY ON CORROSION-INHIBITION PERFORMANCES OF CALCIUM LIGNOSULPHONATE OF DIFFERENT RELATIVE MOLECULAR WEIGHTS[J]. , 2005, 25(04): 100-104.
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