Potansiyodinamik Korozyon Testi
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
Elektrokimyasal teknikler maddenin elektrokimyasal özellikleri elde etmek için hızlı ve nispeten pahalı olmayan bir yöntem sağlar. Bu teknikler kontrollü elektrokimyasal rahatsızlık 1-5 şarj transfer sürecinin tepkisini gözlemleyerek bir metalin korozyonu tespit yeteneğine ağırlıklı dayanır. Bir vücut ortamında metal implantların korozyon nedeniyle biyouyumluluk ve malzeme bütünlüğü 6 üzerindeki olumsuz etkileri için kritik öneme sahiptir. Gövde içinde implant aşınmasına katkıda bulunan ana etken metal iyonları 7-11 artan serbest bırakılmasına yol açacak bir yüzey oksit eritilmesidir. Bu, lokal olarak, fakat implantın 10,12-28 erken bozulmasına neden potansiyel sistemik etkileri ile bulunabilir istenmeyen biyolojik reaksiyonlar, elde edilir.
Bir test numunesinin korozyon karakteristikleri üretilen polarizasyon tarama tahmin edilmektedirBir potansiyostatla. Bir polarizasyon taraması, bir metal alt-tabakanın kinetik ve korozyon parametrelerinin ekstrapolasyonu mümkün kılar. Tarama sırasında oksidasyon veya elektro-aktif türlerin azaltılması yük transferi ve reaktanların ve ürünlerin hareketi ile sınırlandırılabilir. Bu faktörlerin hepsi polarizasyon taraması ile kapsüllü; Bu nedenle, çok sayıda devir boyunca güvenilir ve tekrarlanabilir bir polarizasyon tarama üreten bir sisteme sahip önemi büyük bir önem taşımaktadır. Bu yazının ana odak, iyi işleyen bir potansiyodinamik korozyon sistemi elde etmek için alınan mantığı ve adımları tanımlayan bir protokol sağlamaktır.
Protocol
Representative Results
Discussion
Paslanmaz çelik örneklerinden üretilen Polarizasyon taramaları güvenilir ve 29 tekrarlanabilir hem iyi işleyen bir korozyon sisteminin gösterge literatürde görülen taramaları ile ilişkilendirilmesi temiz sürekli araziler gösterdi. Potansiyodinamik çukurlaşma potansiyellerinin yoksul tekrarlanabilirlik bir stokastik süreç 29 ile karakterize potansiyel varlık çukurlaşma ile, birkaç yüz milivolt yayılması ile tanımlanır. Bu sıcaklıkta, halid içeriğine ve potansiyel (V) d…
Declarações
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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