Influence of Surface Modification on Properties of Stainless Steel Used for Implants / Wpływ Modyfikacji Powierzchni Na Właściwości Stali Nierdzewnej Stosowanej Na Implanty

Abstract

Influence of surface modIfIcatIon on propertIes of staInless steel used for Implants WpłyW modyfikacji poWierzchni na WłaściWości stali nierdzeWnej stosoWanej na implantyThe aim of the study was assessment of the influence of stainless steel 316 LVM surface modification on its functional properties. The analyzed steel undergone a surface treatment consisting of the following processes: mechanical polishing, chemical passivation and deposition of Al2O3 layers by Atomic Layer Deposition method. The proposed variant of surface treatment will undoubtedly contribute to improving the functional properties of stainless steel intended for implants. In order to assess functional properties of the steel, electrochemical studies, adhesion (scratch test), wetting angle tests and topography of surface (AFM method) were performed. The obtained results of the study showed clearly that the proposed by the authors way of surface treatment including: mechanical polishing, chemical passivation and deposition of Al2O3 layer by means of the ALD method effectively improves the corrosion resistance of stainless steel.Keywords: ALD method, pitting corrosion, scratch test, wettability, AFM Celem pracy była ocena wpływu modyfikacji powierzchni stali nierdzewnej 316 LVM na jej właściwości funkcjonalne. Obróbka powierzchni składała się z następujących procesów: polerowanie mechaniczne, chemiczna pasywacja i naniesienie warstw Al2O3 metodą ALD (Atomic Layer Deposition). Zaroponowany wariant obróbki powierzchni niewątpliwie przyczyni się do poprawy właściwości funkcjonalnych stali przeznaczonej na implanty. W celu oceny właściwości funkcjonalnych stali przeprowadzono badania elektrochemiczne, badania adhezji warstw (scratch test), oraz badania zwilżalności (kąt zwilżania i badania topografii powierzchni metodą AFM). Uzyskane wyniki badań wykazały wyraźnie, że zaproponowany przez autorów sposób obróbki powierzchni, w tym: polerowanie mechaniczne, pasywacja chemiczna i naniesienie warstw Al2O3 metodą ALD skutecznie poprawia odporność na korozję stali nierdzewnej.

Comparison of the physicochemical properties of Al2O3 layers applied to the surfaces of cpTi and the Ti6Al7Nb alloy using the ALD method

“…Earlier works allowed the authors to specify the number of cycles for depositing layers with the best set of physicochemical properties. 11,[16][17] On this basis, the application of a Al 2 O 3 coating on a titanium substrate (cpTi and Ti6Al7Nb) at …”

The Influence of Carbon Coatings on the Functional Properties of X39Cr13 and 316LVM Steels Intended for Biomedical Applications

“…In order to verify the adhesion lost, a microscopic observation of the substrate was performed. Finally, wettability tests were performed by the procedure developed by Basiaga et al [33]. Wettability is a property that allows to measure the degree of absorption and aggregation of the material.…”

“…This is connected with the physical phenomena occurring on its surface, mainly the surface energy, the size of which determinates rate and extent of aggregation factors such as bacterial plaque, hydrophobicity, or hydrophilicity of the material. The degree and time in which the material absorbs moisture, has a large influence on the strength of implants and protection of patients against the risk of inflammation [33]. It has also been pointed out that wettability influence greatly the protein adsorption and subsequent confirmation, playing a significant role on the biocompatibility of the material [34].…”

Enhancement of the Pitting Corrosion Resistance of AISI 316LVM Steel with Ta-Hf-C/Au Bilayers for Biomedical Applications

“…On the other hand, Liu et al [29] have shown that 316LVM steel stents coated with TiO 2 layers presented better passivation stability and antibreakdown performance than bare stents in a phosphate buffered solution. In general, the surface modification of the 316LVM stainless steel seems to be one of the solutions to improve its corrosion resistance in physiological conditions in order to be used as human implants [30,31].…”