عند جهد اختبار التآكل
Summary
Here, we present a protocol to set up and run an in vitro potentiodynamic corrosion system to analyze pitting corrosion for small metallic medical devices.
Abstract
Different metallic materials have different polarization characteristics as dictated by the open circuit potential, breakdown potential, and passivation potential of the material. The detection of these electrochemical parameters identifies the corrosion factors of a material. A reliable and well-functioning corrosion system is required to achieve this.
Corrosion of the samples was achieved via a potentiodynamic polarization technique employing a three-electrode configuration, consisting of reference, counter, and working electrodes. Prior to commencement a baseline potential is obtained. Following the stabilization of the corrosion potential (Ecorr), the applied potential is ramped at a slow rate in the positive direction relative to the reference electrode. The working electrode was a stainless steel screw. The reference electrode was a standard Ag/AgCl. The counter electrode used was a platinum mesh. Having a reliable and well-functioning in vitro corrosion system to test biomaterials provides an in-expensive technique that allows for the systematic characterization of the material by determining the breakdown potential, to further understand the material’s response to corrosion. The goal of the protocol is to set up and run an in vitro potentiodynamic corrosion system to analyze pitting corrosion for small metallic medical devices.
Introduction
توفر التقنيات الكهروكيميائية طريقة سريعة وغير مكلفة نسبيا للحصول على خصائص الكهروكيميائية من مادة. وتستند هذه التقنيات أساسا على القدرة على الكشف عن تآكل المعدن من خلال مراقبة استجابة عملية تهمة نقل إلى اضطراب الكهروكيميائية التي تسيطر عليها 1-5. تآكل المعادن يزرع في بيئة الجسم أمر بالغ الأهمية نظرا لآثارها السلبية على توافق مع الحياة والمادية سلامة 6. العامل الرئيسي الذي ساهم في تآكل يزرع داخل الجسم هو حل أكسيد السطح مما يؤدي إلى زيادة إطلاق الأيونات المعدنية 7-11. وهذا يؤدي إلى ردود الفعل البيولوجية السلبية، التي يمكن العثور عليها محليا، ولكن مع الآثار المحتملة النظامية مما أدى إلى فشل سابق لأوانه من زرع 10،12-28.
ومن المتوقع خصائص التآكل لاختبار عينة من الفحص الاستقطاب المنتجةقبل potentiostat. تفحص الاستقطاب يسمح للاستقراء المعلمات الحركية وتآكل ركيزة معدنية. أثناء الفحص، وأكسدة أو الحد من الأنواع الكهربائية النشطة يمكن أن تكون محدودة بسبب تهمة نقل وحركة المواد المتفاعلة أو المنتجات. هذه العوامل كلها مغلفة بواسطة الفحص الاستقطاب. ولذلك فإن أهمية وجود نظام الذي ينتج مسح موثوق بها وقابلة للتكرار الاستقطاب عبر دورات متعددة ذات أهمية كبيرة. التركيز الرئيسي من هذا المخطوط هو توفير بروتوكول تحديد الأساس المنطقي والخطوات المتخذة للحصول على نظام التآكل عند جهد يعمل بشكل جيد.
Protocol
Representative Results
Discussion
وأظهرت مسح الاستقطاب التي تنتج من العينات الفولاذ المقاوم للصدأ المؤامرات المستمرة نظيفة الربط مع بالاشعة ينظر في الأدب يدل على نظام تآكل يعمل بشكل جيد والتي هي على حد سواء موثوقة واستنساخه 29. يتم التعرف على استنساخ ضعف إمكانات تأليب عند جهد مع انتشار بضع مئات …
Disclosures
The authors have nothing to disclose.
Acknowledgements
The authors had no funding provided for this study.
Materials
| Potentiostat | Metrohm | PGSTAT101 | |
| Ag/AgCl reference electrode, shielded | Metrohm | 6.0729.100 | |
| Electrode shaft | Metrohm | 6.1241.060 | |
| Polisher Forcipol 1v | Metkon | 3602 | |
| Clindrical flask 700mL | SciLabware | FR700F | |
| Reaction lid | SciLabware | MAF2/41 | |
| Dichloromethane | Sigma-Aldrich | MKBR7629V | use under a fumehood. Wear protective clothing |
| Thermo / HAAKE D Series Immersion Circulators | Haake |
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