TECHICAL Series MATHEMATICS • INFORMATICS • PHYSICS Series PHILOLOGY Series ECONOMIC SCIENCES Sereies EDUCATIONAL SCIENCES Series LAW AND SOCIAL SCIENCES Series
Electrochemical Surface Characterization of Diamond-like Carbon Deposited on Biomedical 316L Stainless Steel
(Caracterizarea electrochimică a stratului DLC depus pe oţel inoxidabil 316L biomedical)
Vol LXII • No. 1/2010
Mihai Iordoc*, Elena Petrache*, Gheorghe Ioniţă**, Elena Valentina Stoian**
* Institutul Naţional de Cercetare Dezvoltare pentru Inginerie Electrică, INCDIE ICPE, Splaiul Unirii, 313, 030138, Bucureşti
e-mail: mihai_iordoc@icpe-ca.ro
** Universitatea Valahia din Târgovişte, Bd. Unirii, nr.18-20, Târgovişte

 Keywords   diamond-like carbon, 316 L stainless steel, corrosion, biomaterial.

 Abstract
Diamond-like carbon (DLC) films were deposited by D.C. magnetron sputtering using a graphite target and argon as the discharge gas. DLC films possess many diamond-like properties including low friction, high hardness, and chemical inertness. This highly biocompatible material can be used as corrosion-resistant coatings for implantable devices. The electrochemical behavior of coated and uncoated biomedical 316L Stainless Steel in simulated body fluid is studied in this paper. DLC coatings were investigated by electrochemical techniques (open circuit potential, variation of polarization resistance in time, potentiodynamic polarization and electrochemical impedance spectroscopy). The electrolyte used in this test was a Hank solution with pH 7.4 at 37 0C. Electrochemical measurements pointed out that DLC coating could improve corrosion resistance in the simulated corrosive environment of the human body. This could be attributed to the formation of a dense and low-porosity coating, which impedes the penetration of water and ions.

 Rezumat
Filmele de "diamond-like carbon" (DLC) au fost depuse prin tehnica "DC magnetron sputtering" folosind o tinta de grafit si argon ca gaz de descarcare. Filmele de DLC prezinta multe proprietati asemanatoare cu ale diamantului, cum ar fi coeficient de frecare mic, duritate ridicata si stabilitate chimica ridicata. Acest material foarte biocompatibil poate fi folosit la acoperiri rezistente la coroziune pentru protezele implantabile. In aceasta lucrare se studiaza comportamentul electrochimic al probelor de otel inoxidabil biomedical 316L, acoperite cu DLC si neacoperite, in fluid anatomic simulat. Acoperirile DLC au fost investigate prin tehnici electrochimice (potential in circuit deschis, variatia rezistentei la polarizare in timp, polarizare potentiodinamica si spectroscopie de impedanta electrochimica. Electrolitul folosit in aceasta testare a fost o solutie Hank cu pH-ul 7.4 la temperatura de 37 0C. Masuratorile electrochimice au scos in evidenta faptul ca acoperirea cu DLC imbunatateste rezistenta la coroziune in mediul coroziv simulat al organismului uman. Acest fapt poate fi atribuit formarii unei acoperiri dense cu porozitate scazuta, care impiedica patrunderea apei si a ionilor.



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