Papers by Author: Zhen Fa Liu

Abstract: Static and dynamic experiments were used to evaluate scale inhibition performance of polyaspartic acid derivative (PASP-SEA-ASP). The static experiments showed that the PASP-SEA-ASP had good scale inhibition performance and the scale inhibition rate exceeded 80% when the PASP-SEA-ASP was 2 mg•L^-1 and the solution temperature was 40 ^OC. In the dynamic experiments, almost no scale formed on the heat transfer surface and the fouling thermal resistance decreases extraordinarily with PASP-SEA-ASP treatment experiment compared with the experiment without treatment. The PASP-SEA-ASP could be used in industrial cooling water systems.

Abstract: A multiple non-phosphorus corrosion inhibitor was prepared by mixing polyaspartic acid with itaconic acid homopolymer, sodium gluconate and surfactant alkylolamide in a certain proportion. The corrosion inhibition performance was tested and the mechanism was studied by electrochemical process. The results showed that synergies among components of the agent made the corrosion inhibition rate on carbon steel reach up to 96.96%. This mainly because that a dense adsorbed film formed on the surface of the carben steeel.

Abstract: The synergistic scale inhibition effect of rare-earth permanent magnetic material and polyaspartic acid is studied. The performance of synergistic scale inhibition is studied in different magnetic field intensity, water hardness and rate of concentration. Static and dynamic scale inhibition tests show that the two water treatment ways have good synergistic scale inhibition effect. The scale inhibition performance of polyaspartic acid can be increased greatly by the magnetization of water.

Abstract: Polyaspartic acid (PASP) composite material, a scale and corrosion inhibitor, is prepared from PASP, acrylic acid-acrylic ester- itaconic acid tripolymer (IA-AA-AE) and 2-phosphonobutane- 1,2,4-tricarboxylic acid (PBTCA). The scale inhibition effects of PASP and PASP composite are investigated. Calcium carbonate crystals in scale samples are characterized by means of SEM. Experimental results show that the scale inhibition rate can reach 98.7 % and corrosion inhibition rate 96.5 % under the conditions of Ca²⁺ 639 mg.L^-1 and PASP composite material 40 mg.L^-1. SEM results show that calcite and aragonite can be transformed into vaterite completely by using PASP composite material.