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Nghiên cứu động lực học phân tử về ba axit amin như chất ức chế ăn mòn cho đồng trong dung dịch hydrochloric acid
Tóm tắt
Mô phỏng động lực học phân tử (MD) được sử dụng để nghiên cứu cơ chế ức chế ăn mòn của cysteine (Cys), glutamic (Glu) và glycine (Gly) đối với đồng trong dung dịch axit hydrochloric. Kết quả từ năng lượng hấp phụ và chức năng phân bố bán kính cho thấy cả ba axit amin có thể tự phát hấp phụ trên bề mặt Cu (111) thông qua hấp phụ hóa học. Giá trị tuyệt đối của năng lượng hấp phụ và cường độ là Cys > Glu > Gly. Hệ số khuếch tán và đường cong nồng độ tương đối cho thấy cả ba axit amin đều có thể ức chế khả năng khuếch tán và kết tụ của các hạt ăn mòn, do đó ba axit amin không chỉ có thể làm chậm quá trình kết tụ của các hạt ăn mòn, mà còn hiệu quả trong việc đẩy lùi các hạt ăn mòn để bảo vệ bề mặt. Khả năng ức chế thu được từ mô phỏng MD cho thấy xu hướng Cys > Glu > Gly, điều này nhất quán với các kết quả thí nghiệm. Hiệu suất ức chế được xác định bởi cả sức mạnh hấp phụ trên bề mặt nền và khả năng ức chế đối với khả năng khuếch tán và kết tụ của các hạt ăn mòn.
Từ khóa
#ăn mòn #ức chế ăn mòn #động lực học phân tử #đồng #axit aminTài liệu tham khảo
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