Research on Preparation and Performance of Environment Friendly Polybasic Non-Phosphate Scale and Corrosion Inhibitor

A quaternary non-phosphorus compound agent was prepared from polyaspartic acid (PASP), aconitic acid-acrylic acid copolymer (AA-AA), sodium gluconate and Zn2+. The performances of scale inhibiting and dispersing, corrosion inhibiting and biodegradability of the agent were studied. The results showed that when the formula was 4mg/L PASP , 8mg/L AA-AA, 20mg/L sodium gluconate and 2mg/L Zn2+, the corrosion rate was 0.0180 mm/a and the corrosion inhibition rate could reach up to 98.01% and the total concentration was not much high. The dynamic simulation test indicated that the scale inhibition and dispersing performance of the compound agent was excellent. In the complex water system which Cl- and SO42- contents were high, the corrosion inhibition rate on carbon steel was still above 90%. The quaternary compound agent applied to high hardness and high corrosivity water quality. It was a kind of high efficient environment friendly corrosion inhibitor, which could replace the phosphorous water treatment agents on the market.