HIỆU ỨNG ỨC CHẾ CỦA CAO CHIẾT LÁ CÂY RAU NGÓT ĐẾN ĂN MÒN THÉP CACBON TRONG MÔI TRƯỜNG HCL 0.1M

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Tác giả: Hà Tuấn Anh

Ngôn ngữ: Vie

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Thông tin xuất bản: Tạp chí Khoa học - Đại học Thủ Dầu Một, 2020

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ID: 408507

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Chủ đề

Thép cacbon là một trong những hợp kim quan trọng của sắt, có nhiều ứng dụng công nghiệp và kỹ thuật vì tính chất cơ học tuyệt vời của nó. Mặc dù thép cacbon có ứng dụng rộng rãi, nhưng nó rất dễ bị ăn mòn do tính không ổn định nhiệt động của nó. Việc sử dụng các chất ức chế là một trong những phương pháp thiết thực nhất để bảo vệ chống ăn mòn, đặc biệt là trong các dung dịch axit để ngăn chặn sự hòa tan kim loại. Trong nghiên cứu này, chúng tôi sử dụng phương pháp điện hóa và phương pháp phân tích bề mặt bằng kính hiển vi quét (SEM) để nghiên cứu khả năng ức chế ăn mòn thép trong môi trường axit clohidric 0,1M của cao chiết lá rau ngót.Phương pháp phân tích điện hóa cho thấy hiệu suất ức chế cao nhất đạt 93,2% khi nồng độ chất ức chế là 1500ppm. Phân tích bề mặt bằng kính hiển vi điện tử quét cho thấy bề mặt thép bị ăn mòn nghiêm trọng khi dung dịch ăn mòn không có chất ức chế, nhưng ít bị ăn mòn hơn trên khi có thêm chất ức chế. Như vậy cao lá rau ngót là một chất ức chế ăn mòn rất tốt cho thép cacbon trong môi trường axit HCl 0,1M., Tóm tắt tiếng anh, Carbon steel is one of the important alloys of iron which has numerous industrial and engineering applications because of its excellent mechanical properties.Even though carbon steel has wide applications, it is very much susceptible to corrosion due to its thermodynamic instability.The use of inhibitors is one of the most practical methods for protection against corrosion especially in acid solutions to prevent metal dissolution... In this study, the effect of extract of Sauropus androgynus (L) Merr leaf on carbon steel in 0.1M naturally-aerated HCl solution was studied as a potential corrosion inhibitor using electrochemical techniques and surface analyses by scanning electron microscopy (SEM). The highest inhibition efficiency of Sauropus androgynus (L.) Merr leaf extract (93,2%) was documented at 1500ppm using electrochemical tests. Surface analysis by scanning electron microscopy indicated that a severe corrosion was observed on the steel surface exposed to solution without inhibitor addition, but less corrosion was observed on the steel surfaces exposed to the inhibited systems. So Sauropus androgynus (L.) Merr leaf extract is a very good corrosion inhibitor for carbon steel in 0,1M HCl environment.

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