Effect of Catharanthus roseus (Vince rosea) and Turmeric (Curcuma longa) Extracts as Green Corrosion Inhibitors for Mild Steel in 1 M HCl

作     者：Rabab Mohamed Abou Shahba Abd El-Aziz El-Sayed Fouda Azza El-Sayed El-Shenawy Amina Salah Mohamed Osman Rabab Mohamed Abou Shahba;Abd El-Aziz El-Sayed Fouda;Azza El-Sayed El-Shenawy;Amina Salah Mohamed Osman

作者机构：Department of Chemistry Faculty of Science El-Azhar University Nasr city Egypt Department of Chemistry Faculty of Science El-Mansoura University El-Mansoura Egypt 

出 版 物：《Materials Sciences and Applications》 (材料科学与应用期刊（英文）)

年 卷 期：2016年第7卷第10期

页      面：654-671页

学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

主　　题：Catharanthus roseus Extract Turmeric Extracts Mild Steel 

摘      要：The corrosion inhibition of mild steel by Catharanthus roseus (Vince rosea) and Turmeric (Curcuma longa) extracts as green inhibitors in 1 M HCl solutions has been investigated by using potentiodynamic polarization, electrochemical impedance spectroscopy (EIS), hydrogen evolution measurements and scanning electron microscope (SEM) techniques. Results obtained show that these investigated compounds are good inhibitors and act as mixed type inhibitors. The inhibition efficiencies increase with increasing inhibitor concentration. The SEM results show the formation of protective film on the mild steel surface in the presence of Catharanthus roseus and Turmeric extracts. The results obtained from different tested techniques are in good agreement.