Tuyển tập các báo cáo nghiên cứu khoa học trên tạp chí khoa học vật lý quốc tế đề tài: Phase Transformation of Rust in the Presence of Various Tannins | Journal of Physical Science Vol. 19 1 31-41 2008 31 Phase Transformation of Rust in the Presence of Various Tannins Solhan Yahya Affaizza Mohamad Shah Afidah Abdul Rahim Nursila Hanim Abd Aziz and Rozieyanie Roslan School of Chemical Sciences Universiti Sains Malaysia 11800 USM Pulau Pinang Malaysia Corresponding author afidah@ Abstract Rust converters are chemical formulations that can be applied to corroded surfaces causing the passivation and elimination of possible further attack after the application of a coating. Tannins extracted from mangrove chestnut quebracho and mimosa as rust converters were evaluated. Two different types of pre-rusted sample preparations were adopted. The pre-rusted samples were immersed in 5 g l of the various tannin solutions and the phase transformations were analyzed via Fourier Transform Infrared FTIR X-ray Diffraction XRD and Scanning Electron Microscopy SEM . The rust components were mainly lepidocrocite y-FeOOH and magnetite Fe3O4 and were found to be dependent on sample preparations. Transformation of rust components to ferric-tannates particularly lepidocrocite in the presence of various tannins could be observed. The relation between the partial transformation of pre-rusted samples and sample preparation is correlated. Keywords tannins phase transformations rust converters lepidocrocite magnetite Abstrak Penukar karat merupakan formulasi kimia yang boleh diaplikasi ke atas permukaan berkarat yang mengakibatkan pempasifan dan mengelakkan kemungkinan serangan lanjutan selepas aplikasi penglitup. Tanin diekstrak daripada bakau buah berangan quebracho dan mimosa yang bertindak sebagai penukar karat telah dikaji. Dua jenis kaedah penyediaan sampel permukaan berkaratyang berbeza telah digunakan. Sampel berkarat telah direndam di dalam pelbagai jenis tanin yang berkepekatan 5 g l dan perubahan fasa karat telah dianalisis menggunakan Spektroskopi Inframerah FTIR Spektrometer Belauan Sinar-X XRD dan Mikroskop Elektron Imbasan .
