期刊名称：Journal of Materials and Environmental Science
印刷版ISSN：2028-2508
出版年度：2018
卷号：9
期号：9
页码：2730-2740
出版社：University of Mohammed Premier Oujda
摘要：The effect of 3-methylquinoxalin-2(1H)-one (MQO), 3.7-dimethylquinoxalin-2(1H)-one (DMQO) and 3,7-methylquinoxaline-2(1H)-thione (DMQS) on mild steel corrosionin 1.0 M H3PO4 has been studied by electrochemical measurements. The resultsindicated that these compounds act as good inhibitors. The DMQO and DMQS act asa cahodic inhibitors while the MQO acts as a mixed type inhibitors. So, it is found thattheir inhibition depend on the methyl number in their structure. It is shown also that theDMQO is the best inhibitor where its inhibition efficiency increases with concentrationto achieve 92 % at 10-4 M. A pseudo plate was observed directly from the corrosionpotential in the presence of DMQO and DMQS. In addition, the adsorption of DMQOmolecules on mild steel surface was also studied and it was found that is adsorbedaccording to the Langmuir isotherm model. In addition, the temperature influence andimmersion time on performance of the best inhibitor (DMQO) was studied. It isestablish that its inhibition efficiency increases with immersion time and take itsperformance at hot temperature.
