Synthesis of polyaspartic acid/3-amino-1H-1,2,4-triazole-5-carboxylic acid hydrate graft copolymer and evaluation of its corrosion inhibition and scale inhibition performance

• A new corrosion and scale inhibitor, PASP/3-A-1H-1,2,4-T-5-CA, was synthesized.
• The PASP/3-A-1H-1,2,4-T-5-CA is non-phosphorus and biodegradable.
• The PASP/3-A-1H-1,2,4-T-5-CA has a super scale inhibition property.
• The corrosion inhibition efficiency is close to 75% when the dosage is 16 mg/L.
• When the graft copolymer was added, the scale crystals became irregular.

A novel scale and corrosion inhibitor, polyaspartic acid/3-amino-1H-1,2,4-triazole-5-carboxylic acid hydrate graft copolymer was synthesized by maleic anhydride, urea and 3-amino-1H-1,2,4-triazole-5-carboxylic acid hydrate. The graft copolymer possesses good corrosion inhibition properties and outstanding scale inhibition performance for CaCO3, Ca3(PO4) and CaSO4 in the simulation experiment. The inhibition efficiency of graft copolymer is close to 100% for Ca3(PO4) scale, polyaspartic acid (PASP) and only 22% when inhibitor concentration is 12 mg/L. Moreover, the inhibition corrosion efficiency can reach up to 75%, with PASP just 45% when inhibitor concentration is 16 mg/L.