A Novel Eco-Friendly Scale and Corrosion Inhibitor Modified by β-Cyclodextrin

A polymer, beta-MEA, was synthesised from beta-cyclodextrin (beta-CD), 3-chloro-2-methylpropene (MAC), epoxysuccinic acid (ESA), and 2-acrylamido-2-methyl propane sulfonic acid (AMPS) with a (NH4)(2)S2O8-NaHSO3 redox initiator system by aqueous solution radical polymerisation. beta-MEA was characterised by means of IR spectroscopy, time-of-flight mass spectrometry, gel permeation chromatography, and thermogravimetric analysis. Its structure, molecular weight, thermal stability, scale and corrosion inhibition performance and mechanism were investigated. The results verified that beta-MEA achieves a better scale inhibition efficiency for BaSO4 compared with poly(aspartic acid) (PASP) (100% cf. 94.9% at a concentration of 20mgL(-1)) and a better corrosion inhibition efficiency of N80 carbon steel in saline water compared with PESA (91.2% cf. 79.7% at a concentration of 1 gL(-1)). The BaSO4 was characterised by scanning electron microscopy (SEM) and X-ray diffraction to investigate the crystal morphology of the scale. Primary research on the mechanism for corrosion inhibition was carried by SEM-chemical analysis.