SCI和EI收录∣中国化工学会会刊

Chinese Journal of Chemical Engineering ›› 2021, Vol. 37 ›› Issue (9): 222-231.DOI: 10.1016/j.cjche.2020.08.013

Previous Articles    

An efficient corrosion inhibitor of cassava starch graft copolymer for aluminum in phosphoric acid

Shuduan Deng1, Xianghong Li2, Guanben Du1   

  1. 1. Yunnan key laboratory of wood adhesives and glue products, Southwest Forestry University, Kunming 650224, China;
    2. College of Chemical Engineering, Southwest Forestry University, Kunming 650224, China
  • Received:2020-06-02 Revised:2020-08-10 Online:2021-11-02 Published:2021-09-28
  • Contact: Shuduan Deng
  • Supported by:
    Funding support from the National Natural Science Foundation of China (51561027), Training Programs of Young and Middle Aged Academic and Technological Leaders in Yunnan Province (2015HB049, 2017HB030) and Special Project of "Top Young Talents" of Yunnan Ten Thousand Talents Plan (51900109) are acknowledged.

An efficient corrosion inhibitor of cassava starch graft copolymer for aluminum in phosphoric acid

Shuduan Deng1, Xianghong Li2, Guanben Du1   

  1. 1. Yunnan key laboratory of wood adhesives and glue products, Southwest Forestry University, Kunming 650224, China;
    2. College of Chemical Engineering, Southwest Forestry University, Kunming 650224, China
  • 通讯作者: Shuduan Deng
  • 基金资助:
    Funding support from the National Natural Science Foundation of China (51561027), Training Programs of Young and Middle Aged Academic and Technological Leaders in Yunnan Province (2015HB049, 2017HB030) and Special Project of "Top Young Talents" of Yunnan Ten Thousand Talents Plan (51900109) are acknowledged.

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