<span style="font-size:15.0pt;font-family: "Times New Roman","serif";mso-fareast-font-family:"Times New Roman";mso-ansi-language: EN-GB;mso-fareast-language:EN-US;mso-bidi-language:AR-SA" lang="EN-GB">Corrosion inhibition of steel in sulphuric acid by aqueous extracts of <i>Rose</i> and <i>Rose water</i></span>

131-138The corrosion inhibition of steel in 2 molar sulphuric acid solution by Rose extract and/or Rose water has been studied at 30°C using chemical (weight loss and hydrogen evolution) and electrochemical (impedance and polarization) measurements. It is found that all methods give consistent results, the inhibition efficiency increases with increasing concentration of the extract, and it shows that rose extract is a better corrosion inhibitor for steel than rose water. The polarization curves indicate that rose extract and rose water act as mixed-type inhibitors. The adsorption of inhibitor on the steel surface is found to obey the Langmuir adsorption isotherm model for rose extract and Freundlich adsorption isotherm for both rose extract and rose water. Thermodynamic data for the adsorption process (Kads and G°ads) were calculated and discussed

Corrosion Inhibition of Aluminum in Acidic Solution by Aqueous Extract of Ajowan Plant as Green Inhibitor

The inhibition of aluminum corrosion in 0.5 M hydrochloric acid by Ajowan plant was studied using chemical (weight loss) and ectrochemical (impedance and polarization) methods. The Ajowan plant extract was found to be good inhibitor for aluminum corrosion in 0.5 M hydrochloric acid in the studied concentration range of inhibitor. Corrosion inhibition could be explained by considering an interaction between metal surface and the inhibitor molecules. Electrochemical measurements showed that Ajowan inhibitor affects both cathodic and anodic Tafel slopes in HCl medium and act as mixed type inhibitor. The adsorption of Ajowan extract on the aluminum surface from HCl follows Langmuir adsorption model.Aluminum, corrosion inhibition, acidic solution, ajowan plant extract

Anticorrosion Nanocrystalline Beta Zeolite Thin Film for Advanced Applications

Steel alloys corrosion is ubiquitous and is conventionally protected by anticorrosion chromate coatings. However, the process suffers from the release of carcinogenic hexavalent chromium ions that needs to be replaced by an ecofriendly alternative. In this context, the need for the development of satisfactory ecofriendly chromium-free coating with superior corrosion performance is highly desirable. In the present study, we synthesized fully dispersible nanocrystalline Beta zeolite seeds and coated on steel alloys followed by steaming. The samples were characterized by XRD, FE-SEM, and DLS analyses. The anticorrosion behavior of the synthesized nanoparticle coatings on steel alloys was investigated by electrochemical measurements (DC polarization) and electrochemical impedance spectroscopy (EIS) in NaCl and acid and alkaline media under identical experimental conditions. The present study demonstrated that the nanozeolite coating can be a potential alternative for toxic and carcinogenic chromate coating