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Chuẩn bị phim MgAl-LDH biến đổi bằng anion hữu cơ một bước dưới điều kiện nhẹ để bảo vệ chống ăn mòn cho hợp kim Mg
Tóm tắt
Phương pháp hỗ trợ chelator được coi là một chiến lược hiệu quả cho việc phát triển tại chỗ các phim hydroxide kép lớp (LDH) trên hợp kim magie ở áp suất khí quyển. Trong nghiên cứu này, hai anion hữu cơ, 2-Mercaptobenzothiazole (MBT) và natri dodecyl benzene sulfonate (SDBS), đã được giới thiệu riêng rẽ trong quá trình tổng hợp các phim LDH bằng phương pháp hỗ trợ chelator để hoàn thiện việc sửa đổi hữu cơ của các phim LDH. Kết quả cho thấy rằng hai anion hữu cơ này đã thúc đẩy sự phát triển của LDH theo những hình thức khác nhau. MBT có thể hình thành một lớp phức chất hữu cơ không hòa tan trên bề mặt của các phim LDH, từ đó cải thiện độ ổn định cấu trúc của chúng. Cấu trúc chuỗi carbon dài của anion SDBS đã được chèn thành công vào lớp giữa của LDH, tạo ra một cấu trúc vi mô tự niêm phong và tăng cường tính kỵ nước của các phim LDH. Cả hai anion đều đạt được thông qua việc chuẩn bị một bước các phim LDH biến đổi hữu cơ trên hợp kim magie AZ31B. Kết quả thử nghiệm điện hóa cho thấy rằng các phim LDH biến đổi có độ biểu kháng cao hơn trong vùng tần số thấp (|Z|LDH-SDBS (1.15 × 106 Ω cm2) >|Z|LDH-MBT (8.58 × 105 Ω cm2) >|Z|MgAl-LDH (4.09 × 105 Ω cm2)), điều này đã cải thiện khả năng chống ăn mòn của các phim LDH.
Từ khóa
#hydroxide kép lớp #hợp kim magie #sửa đổi hữu cơ #điện hóa #chống ăn mònTài liệu tham khảo
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