Electrochemical Corrosion Behavior of Nickel-Chrome Alloy in Artificial Saliva/ (Record no. 165906)
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| fixed length control field | 07707namaa22004211i 4500 |
| 003 - CONTROL NUMBER IDENTIFIER | |
| control field | OSt |
| 005 - DATE AND TIME OF LATEST TRANSACTION | |
| control field | 20250223033215.0 |
| 008 - FIXED-LENGTH DATA ELEMENTS--GENERAL INFORMATION | |
| fixed length control field | 231203s2022 ua a|||f |m|| 000 0 eng d |
| 040 ## - CATALOGING SOURCE | |
| Original cataloging agency | EG-GICUC |
| Language of cataloging | eng |
| Transcribing agency | EG-GICUC |
| Modifying agency | EG-GICUC |
| Description conventions | rda |
| 041 0# - LANGUAGE CODE | |
| Language code of text/sound track or separate title | eng |
| Language code of summary or abstract | eng |
| -- | ara |
| 049 ## - LOCAL HOLDINGS (OCLC) | |
| Holding library | Deposit |
| 082 04 - DEWEY DECIMAL CLASSIFICATION NUMBER | |
| Classification number | 547.05625 |
| Edition number | 21 |
| 092 ## - LOCALLY ASSIGNED DEWEY CALL NUMBER (OCLC) | |
| Classification number | 547.05625 |
| Edition number | 21 |
| 097 ## - Thesis Degree | |
| Thesis Level | M.Sc |
| 099 ## - LOCAL FREE-TEXT CALL NUMBER (OCLC) | |
| Classification number | Cai01.12.11.M.Sc.2022.Ah.E |
| 100 0# - MAIN ENTRY--PERSONAL NAME | |
| Personal name | Ahmed Abdellatif Ahmed Mohamed, |
| Relator term | preparation. |
| 245 10 - TITLE STATEMENT | |
| Title | Electrochemical Corrosion Behavior of Nickel-Chrome Alloy in Artificial Saliva/ |
| Statement of responsibility, etc. | by Ahmed Abdellatif Ahmed Mohamed; Prof. Dr. Magda Abdo Ameer, Prof. Dr. Azza Abdel Moneim Ghoneim, Prof. Dr. Tayseer Abdel Khalek. |
| 246 15 - VARYING FORM OF TITLE | |
| Title proper/short title | سلوك التآكل الكهروكيميائي لسبيكة النيكل كروم في اللعاب الإصطناعي |
| 264 #0 - PRODUCTION, PUBLICATION, DISTRIBUTION, MANUFACTURE, AND COPYRIGHT NOTICE | |
| Date of production, publication, distribution, manufacture, or copyright notice | 2022. |
| 300 ## - PHYSICAL DESCRIPTION | |
| Extent | 137 pages : |
| Other physical details | illustrations ; |
| Dimensions | 25 cm. + |
| Accompanying material | CD. |
| 336 ## - CONTENT TYPE | |
| Content type term | text |
| Source | rdacontent |
| 337 ## - MEDIA TYPE | |
| Media type term | Unmediated |
| Source | rdamedia |
| 338 ## - CARRIER TYPE | |
| Carrier type term | volume |
| Source | rdacarrier |
| 502 ## - DISSERTATION NOTE | |
| Dissertation note | Thesis (M.Sc.)-Cairo University, 2022. |
| 504 ## - BIBLIOGRAPHY, ETC. NOTE | |
| Bibliography, etc. note | Bibliography: pages 111-132. |
| 520 ## - SUMMARY, ETC. | |
| Summary, etc. | The present work is devoted to systematic and detailed investigation concerning<br/>the electrochemical and corrosion behavior of the dental, non-precious Ni-Cr<br/>based alloy in artificial saliva solution which permits the estimation of the<br/>behavior of the material in the oral cavity. A modification of the dental alloy<br/>properties could be performed by coating the alloy surface using two ecofriendly<br/>coatings, including, polyvinyl silsesquioxane (pvs) and nanohydroxyapatite<br/>(nHAp) separately in artificial saliva solution. The aim is to<br/>develop protection systems with improved corrosion protection properties and a<br/>low environmental impact.<br/>Accordingly, this thesis is organized into four chapters.<br/>Chapter 1: Introduction:<br/>This chapter presents a review of established literature, relevant to the main<br/>themes of this thesis. It provides a general introduction to the biomaterials and<br/>the dental Ni-Cr alloys and their applications history. Silane coupling agent used<br/>in dentistry and trialkoxysilane in addition to the hydroxyapatite used in the<br/>form of coatings on metal implants.<br/>Chapter 2: Experimental:<br/>describes the methods for preparing the different coating materials and their<br/>composition also the techniques employed include measurements of the opencircuit<br/>potential (OCP), potentiodynamic polarization, electrochemical<br/>135<br/>impedance spectroscopy (EIS as well as surface characterization studies of the<br/>coatings such as SEM and EDX.<br/>Chapter 3: Results and discussion:<br/>The electrochemical corrosion behavior of dental Ni-Cr (Wirolloy) was studied<br/>in absence and presence of two types of environmentally friendly coating<br/>materials PVS or HAp and nHAp in artificial saliva solution at 37 °C for 14<br/>days of immersion using chemical dip-coating method or electrochemical<br/>coating technique.<br/>the following are the main points found in this study :<br/>The corrosion behavior for uncoated and coated samples in artificial saliva<br/>solution was achieved by using OCP, EIS and polarization techniques to<br/>investigate the effectiveness of the coating films in improving the corrosion<br/>resistance of the Ni-Cr alloy. The results support that electrochemically coated<br/>sample with nHAp is favored and has the highest positive potential values over<br/>all time intervals.<br/>EIS results showed that the total resistance (RT) of the surface film on the tested<br/>electrode is found to decrease with time of immersion, and that the total<br/>impedance values for the non-coated alloy is much lower than those of<br/>chemically or electrochemically coated alloy with PVS or HAp and nHAp<br/>which assumes a great influence of the coatings on increasing the Wirolloy<br/>impedance. In this work we are focused to model the response function of this<br/>136<br/>biomaterial using an Electrical Equivalent Circuit (EEC) to analyze data<br/>obtained by the Electrochemical Impedance Spectroscopy (EIS). The<br/>experimental results showed that the Ni-Cr alloy is a passive biomaterial which<br/>presents a quiet good resistance to corrosion when coated with PVS or nHAp. A<br/>model of electric circuit was proposed to describe the electrochemical behavior<br/>of the uncoated and coated biomaterial on the frequency range (0,100 KHz). The<br/>equivqlent circuit proposed the presence of 2 Constant Phase Elements (CPE)<br/>which explain the heterogeneity on the Metal/Electrolyte interface. Theoretical<br/>model results were in good agreement with the experimental data with a best-fit<br/>corresponding to a minimum standard deviation.<br/>The polarization results showed that the lower (icorr) and the corresponding<br/>higher (RP) for Both electrochemically nHAp & PVS coatings after 14 days<br/>immersion in saliva solution indicate stable and higher corrosion prevention<br/>rather than the chemically dip-coated alloy, although the impedance of the later<br/>was greatly enhanced along the first three days of immersion but it consequently<br/>started to drop rapidly and the film loses its protective properties.<br/>The stability of the tested alloy coats increases in the order: EC coated nHAp ><br/>EC coated PVS > C coated HAp > C coated PVS > non-coated alloy, as<br/>obtained from EIS measurements. The results of OCP, EIS and polarization are<br/>concurrent with each other that the electrochemically nHAp and PVS coatings<br/>are the most corrosion prevention.<br/>137<br/>The good corrosion protection of the nHAp coated alloy surpassing those for<br/>the PVS coated ones can be attributed to the adsorption of HA nanoparticles on<br/>the alloy surface, hindering the transfer of electrons and ions between the alloy<br/>and the artificial saliva, which seemed to provide some corrosion protection.<br/>SEM and EDX analyses proved the formation of the examined coating films on<br/>the electrode surface, the electrochemically deposited nHAp and PVS have<br/>excellent corrosion resistance, stability and more uniform surface coverage.<br/>The chemical analysis of the corrosion products showed that all the formed<br/>coatings are efficient in suppression of leaching of Ni ions into the solution with<br/>some advantage to the electrochemical method over the chemical/dip-coating<br/>method |
| 520 ## - SUMMARY, ETC. | |
| Summary, etc. | العمل الحالي مخصص لتحقيق منهجي ومفصل بشأن<br/>السلوك الكهروكيميائي والتآكل للأسنان Ni-Cr غير الثمينة<br/>سبيكة أساسها في محلول اللعاب الاصطناعي مما يسمح بتقدير<br/>سلوك المواد في تجويف الفم. تعديل سبيكة الأسنان<br/>يمكن تنفيذ الخصائص عن طريق طلاء سطح السبائك باستخدام اثنين صديقين للبيئة<br/>الطلاءات، بما في ذلك البولي فينيل سيلسكويوكسان (pvs) ونانوهيدروكسيباتيت<br/>(nHAp) بشكل منفصل في محلول اللعاب الاصطناعي. والهدف هو<br/>تطوير أنظمة الحماية مع تحسين خصائص الحماية من التآكل و أ<br/>تأثير بيئي منخفض.<br/>وبناء على ذلك فقد تم تنظيم هذه الرسالة في أربعة فصول. |
| 530 ## - ADDITIONAL PHYSICAL FORM AVAILABLE NOTE | |
| Additional physical form available note | Issues also as CD. |
| 546 ## - LANGUAGE NOTE | |
| Language note | Text in English and abstract in Arabic & English. |
| 650 #0 - SUBJECT ADDED ENTRY--TOPICAL TERM | |
| Topical term or geographic name entry element | Nickel-chromium alloys. |
| 653 #0 - INDEX TERM--UNCONTROLLED | |
| Uncontrolled term | Nickel-Chrome |
| -- | Wirolloy |
| -- | Organo-silane |
| -- | Vinyl trimethoxy silane |
| -- | Polyvinylsilsesquioxane |
| 700 0# - ADDED ENTRY--PERSONAL NAME | |
| Personal name | Magda Abdo Ameer |
| Relator term | thesis advisor. |
| 700 0# - ADDED ENTRY--PERSONAL NAME | |
| Personal name | Azza Abdel Moneim Ghoneim |
| Relator term | thesis advisor. |
| 856 ## - ELECTRONIC LOCATION AND ACCESS | |
| Uniform Resource Identifier | <a href="http://172.23.153.220/th.pdf">http://172.23.153.220/th.pdf</a> |
| 900 ## - EQUIVALENCE OR CROSS-REFERENCE-PERSONAL NAME [LOCAL, CANADA] | |
| Numeration | 01-01-2022 |
| Titles and other words associated with a name | Magda Abdo Ameer |
| -- | Azza Abdel Moneim Ghoneim |
| Universities | Cairo University |
| Faculties | Faculty of Science |
| Divisons | Department of Chemistry |
| 905 ## - LOCAL DATA ELEMENT E, LDE (RLIN) | |
| Cataloger | Huda |
| 942 ## - ADDED ENTRY ELEMENTS (KOHA) | |
| Source of classification or shelving scheme | Dewey Decimal Classification |
| Koha item type | Thesis |
| Edition | 21 |
| Suppress in OPAC | No |
| Source of classification or shelving scheme | Not for loan | Home library | Current library | Date acquired | Full call number | Barcode | Date last seen | Koha item type |
|---|---|---|---|---|---|---|---|---|
| Dewey Decimal Classification | Not for loan | المكتبة المركزبة الجديدة - جامعة القاهرة | قاعة الرسائل الجامعية - الدور الاول | 11.02.2024 | Cai01.12.11.M.Sc.2022.Ah.E | 01010110087778000 | 03.12.2023 | Thesis |