FREE DOWNLOAD THESIS ::A Novel Corrosion Inhibitor for Mild Steel in Acid Media

FREE DOWNLOAD THESIS ::A Novel Corrosion Inhibitor for Mild Steel in Acid Media (The Open Electrochemistry Journal, 2010, 2, 43-51)
Page : 9
Category : Mechanical engineering
Department of Chemistry, Udai Pratap Autonomous College, Varanasi 221002, IndiaDepartment of Applied Chemistry, Institute of Technology Banaras Hindu University, Varanasi 221005, India

Abstract : 
Abstract: Corrosion inhibition of mild steel in 1 M HCl and 0.5 M H2SO4 by dapsone were studied by polarization resistance, Tafel polarization, electrochemical impedance spectroscopy (EIS) and weight loss measurement. Results obtained revealed that inhibition occurs through adsorption of the drug on metal surface without modifying the mechanism of corrosion process. Potentiodynamic polarization suggested that it acts as a mixed type predominantly cathodic in HCl and predominantly anodic in H2SO4. Electrochemical impedance spectroscopy was used to investigate the mechanism of corrosion inhibition. Thermodynamic parameters such as mechanism of inhibition. The adsorption of dapsone followed Langmuir adsorption isotherm....

free download journal material engineering::THE ISOLATION AND ANALYSIS OF PROTEIN FROM TOFU WASTE AS CORROSION INHIBITOR TOWARDS CARBON STEEL IN 1% NACl SOLUTION

free download journal material engineering::THE ISOLATION AND ANALYSIS OF PROTEIN FROM TOFU WASTE AS CORROSION INHIBITOR TOWARDS CARBON STEEL IN 1% NACl SOLUTION

By. MEGAWATI ZUNITA, SADIJAH ACHMAD, DEANA WAHYUNINGRUM, BUNBUN BUNDJALI
Chemistry Study Program, Faculty of Mathematics and Natural Sciences, Bandung Institute of Technology

Page: 9
Capacity : 281 kb
Category : Chemistry science
Language : English
Abstract:
Corrosion could damage many aspects in life; therefore corrosion inhibitor was needed to overcome those problems. The aim of this research is to isolate protein from the foodstuffs waste that contain high protein, suchs as tofu, and at the same time is to increase the economical value of tofu waste. The isolation was carried out by two methods: precipitation by 10% v/v acetic acid solution and protein fractination by ammonium sulphate. The determination of corrosion inhibition activity utilized the Tafel method at the concentration of 80 ppm in 1% NaCl w/v solution. The corrosion inhibition activity of protein isolated by precipitation methods is 53.41%. Six protein fractions (fraction of 0%-60%) was obtained from fractination methods. The largest corrosion inhibition activity (70.89%) was shown on the fraction of 20-30%, which is larger than the corrosion inhibition activity of the tofu waste before being isolated (29.74%). Amino acids contained in isolated protein that have the influence to corrosion inhibition activity was analyzed by hydrolisis methods, which are: methionine, proline, tyrosine, asparagine, and thrytophane. The results of this research showed that protein isolated from the tofu waste have the potent as corrosion inhibitor towards carbon steel in 1%NaCl solution.
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Free download journal Marine & ship Engineering ::CRITERIA FOR YAW-CHECKING AND COURSE-KEEPING ABILITIES IN IMO’s INTERIM STANDARDS FOR SHIP MANOEUVABILITY

Free download journal Marine & ship Engineering ::CRITERIA FOR YAW-CHECKING AND COURSE-KEEPING ABILITIES IN IMO’s INTERIM STANDARDS FOR SHIP MANOEUVABILITY

“MARSIM 2000” Conference Proceedings (May 8-12,2000 Orlando, USA) International Conference on Marine Simulation and Ship Maneuvering.

By. Yasuo Yoshimura, Sumitomo Heavy Industries Ltd., Yokosuka, Japan Kuniji Kose, Hiroshima University, Higashi-Hiroshima, Japan Tomihiro Haraguchi, Ship Research Institute of Japan, Mitaka, Japan

Total Page : 12
Capacity  : 245 Kb.
Language : English
Abstrack:
International Maritime Organization (IMO) adopted the interim standards for ship manoeuvrability A751(18) in 1993 for preventing the marine disasters. These standards cover the typical manoeuvrability including turning ability, course-keeping and yaw-checking ability and stopping ability. As these standards, however, were not settled under the sufficient manoeuvrability data, it was noted that they should be reviewed and finalised after practical experiences. For this purpose, the Ministry of Transport of Japan has been gathering the many trial data for these 5 years, and pointed out that the criteria regarding to course-keeping, yaw-checking and stopping abilities have some problems in the practical application to the actual ships [IMO DE35 INF.14].
In this paper, the authors review the manoeuvrability standards particularly focussing the criteria for the course-keeping and yaw-checking abilities in the present interim standards. Firstly, the indices for these abilities are discussed. Then, the criteria are evaluated based on the many trial data as well as theoretical and simulator studies. Finally, some proposals are summarised for the revise of the interim manoeuvrability standards.

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