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

doi:10.1016/j.cjche.2020.08.013

中国化学工程学报 ›› 2021, Vol. 37 ›› Issue (9): 222-231.DOI: 10.1016/j.cjche.2020.08.013

• Material and Product Engineering • 上一篇

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

Shuduan Deng¹, Xianghong Li², Guanben Du¹

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

收稿日期:2020-06-02 修回日期:2020-08-10 出版日期:2021-09-28 发布日期:2021-11-02
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.

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

Shuduan Deng¹, Xianghong Li², Guanben Du¹

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:2021-09-28 Published:2021-11-02
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.

摘要/Abstract

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

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

Shuduan Deng, Xianghong Li, Guanben Du. An efficient corrosion inhibitor of cassava starch graft copolymer for aluminum in phosphoric acid[J]. 中国化学工程学报, 2021, 37(9): 222-231.

Shuduan Deng, Xianghong Li, Guanben Du. An efficient corrosion inhibitor of cassava starch graft copolymer for aluminum in phosphoric acid[J]. Chinese Journal of Chemical Engineering, 2021, 37(9): 222-231.

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

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

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