Abstract: Starch is one of the richest natural polymers with low-cost, non-toxic and biodegradable, but is seldom directly used as corrosion inhibitor due to its poor inhibitive ability and low water solubility. To solve this problem, cassava starch-acryl amide graft copolymer (CS-AAGC) was prepared through grafting acryl amide (AA) with cassava starch (CS), and it was firstly examined as an efficient inhibitor for 1060 aluminum in 1.0 mol·L^-1 H₃PO₄ media. The adsorption behavior of CS-AAGC and its electrochemical mechanism were investigated by weight loss and electrochemical methods. Additionally, the inhibited aluminum surface was fully characterized by a series of SEM, AFM, contact angle measurements and XPS. Results confirm that CS-AAGC performs better inhibitive ability than CS, AA or CS/AA mixture, and the maximum inhibition efficiency of 1.0 g·L^-1 CS-AAGC is 90.6% at 20℃. CS-AAGC acts as a mixed-type inhibitor while mainly retards the anodic reaction. EIS has three time constants, and the polarization resistance is significantly increased in the presence of CS-AAGC. The micrograph of inhibited aluminum surface is of hydrophobic nature with low surface roughness and little corrosion degree.

Key words: Rice (Oryza sativa L.), Saline-alkaline stress, Abscisic acid (ABA), OsABA8ox1-kd, Endogenous ABA levels

摘要： Starch is one of the richest natural polymers with low-cost, non-toxic and biodegradable, but is seldom directly used as corrosion inhibitor due to its poor inhibitive ability and low water solubility. To solve this problem, cassava starch-acryl amide graft copolymer (CS-AAGC) was prepared through grafting acryl amide (AA) with cassava starch (CS), and it was firstly examined as an efficient inhibitor for 1060 aluminum in 1.0 mol·L^-1 H₃PO₄ media. The adsorption behavior of CS-AAGC and its electrochemical mechanism were investigated by weight loss and electrochemical methods. Additionally, the inhibited aluminum surface was fully characterized by a series of SEM, AFM, contact angle measurements and XPS. Results confirm that CS-AAGC performs better inhibitive ability than CS, AA or CS/AA mixture, and the maximum inhibition efficiency of 1.0 g·L^-1 CS-AAGC is 90.6% at 20℃. CS-AAGC acts as a mixed-type inhibitor while mainly retards the anodic reaction. EIS has three time constants, and the polarization resistance is significantly increased in the presence of CS-AAGC. The micrograph of inhibited aluminum surface is of hydrophobic nature with low surface roughness and little corrosion degree.

关键词: Rice (Oryza sativa L.), Saline-alkaline stress, Abscisic acid (ABA), OsABA8ox1-kd, Endogenous ABA levels