木薯淀粉接枝共聚物对钢、铝的缓蚀性能及机理研究

依托云南丰富的木薯资源，结合云南木薯淀粉产业发展的大好机遇。本项目采用木薯淀粉与烯类单体接枝共聚合成制备出木薯淀粉接枝共聚物，用失重法、电化学法、仪器分析测试、量子化学计算和分子动力学模拟研究木薯淀粉接枝共聚物在各类溶液（酸性、碱性、中性）介质中对钢、铝的缓蚀性能和作用机理。建立一条成本低廉的木薯淀粉接枝共聚物缓蚀剂制备路线；积累木薯淀粉接枝共聚物对钢、铝缓蚀性能的新数据；揭示合成条件、缓蚀剂浓度、介质浓度、温度、腐蚀浸泡时间对缓蚀性能的影响规律；拟合木薯淀粉接枝共聚物的吸附等温式，计算出吸附热力学和腐蚀动力学参数；阐明接枝共聚物在钢、铝表面的吸附行为及电化学作用机理；表征吸附膜层的微观形貌和成分；阐释缓蚀剂分子的构效关系及其在金属表面的吸附方式；提出合理的缓蚀机理；为寻求钢和铝价廉、高效、无毒、使用安全的木薯淀粉接枝共聚物缓蚀剂提供理论依据，为木薯淀粉资源作为缓蚀剂的开发利用奠定基础。

Yunnan province is rich in cassava resources, and there is a good opportunity and surroundings of cassava starch industry. In this project, cassava starch graft copolymer (CSGC) was prepared by grafting vinyl monomers onto cassava starch. The inhibition action and mechanism of CSGC on the corrosion of steel and aluminium in various solutions (acid, alkaline, neutral) are studied by weight loss method, electrochemical technique, advanced instrumental analyst, quantum chemical calculation and molecular dynamic simulation. It is aimed to develop a preparation routine with low-cost and good reproducibility of preparing CSGC. The new data of the inhibition action of CSGC on steel and aluminium are accumulated. It is also aimed to reveal the effects of preparation CSGC condition, inhibitor concentration, media concentration, temperature and corrosion immersion time on the inhibitive performance. The adsorption isotherm of inhibitor on metal surface can be obtained via fitting with the experimental data. The adsorption thermodynamic parameters and corrosion kinetic parameters are calculated. It is to elucidate the adsorption behavior of CSGC on metal surface and the electrochemical mechanism. The micro-topography and chemical composition of the adsorption film of inhibitor on metal surface are characterized by advanced analystic instruments. Also, it is to study the relationship between molecular structure and inhibition ability using quantum chemical calculation, and the adsorption mode of inhibitor molecule on metal surface by molecular dynamic simulation. The reasonable inhibitive mechanism is proposed. It is hoped to provide the academic foundation in search of CSGC inhibitor with low-cost, high inhibition efficiency, non-toxicity and safety for steel and aluminium, and then directs the exploitation of the corrosion inhibitor using cassava starch.